No.
TN0064041
(
Modified)

Authorization
to
discharge
under
the
National
Pollutant
Discharge
Elimination
System
(
NPDES)

Issued
By
Tennessee
Department
of
Environment
and
Conservation
Division
of
Water
Pollution
Control
401
Church
Street
6th
Floor,
L
&
C
Annex
Nashville,
Tennessee
37243­
1534
Under
authority
of
the
Tennessee
Water
Quality
Control
Act
of
1977
(
T.
C.
A.
69­
3­
101
et
seq.)
and
the
delegation
of
authority
from
the
United
States
Environmental
Protection
Agency
under
the
Federal
Water
Pollution
Control
Act,
as
amended
by
the
Clean
Water
Act
of
1977
(
33
U.
S.
C.
1251,
et
seq.)

Discharger:
Metro
Nashville
Airport
Authority
is
authorized
to
discharge:
treated
aircraft
deicing
fluid
and
storm
water
runoff
from
Outfall
002,
overflow
from
South
and
North
Ponds
from
Outfalls
003
and
004,
and
storm
water
runoff
from
Outfalls
SW1
through
S11
from
a
facility
located:
in
Nashville,
Davidson
County,
Tennessee
to
receiving
waters
named:
Sims
Branch
at
miles
1.8
to
Mill
Creek
at
mile
1.6
to
the
Cumberland
River
at
mile
194.5
(
Outfall
002);
Sims
Branch
at
miles
1.9
and
2.0
(
Outfalls
003
and
004),
McCrory
Creek
to
Stones
River
at
mile
5.8
(
Outfall
SW1),
Sims
Branch
to
Mill
Creek
at
mile
1.6
to
the
Cumberland
River
at
mile
194.5
(
Outfalls
SW2,
SW3,
SW4,
SW5,
&
SW6);
and
Mill
Creek
to
the
Cumberland
River
at
mile
194.5
(
Outfalls
SW7,
S10,
&
S11)

in
accordance
with
effluent
limitations,
monitoring
requirements
and
other
conditions
set
forth
herein.

This
permit
shall
become
effective
on:
January
1,
2004
This
permit
shall
expire
on:
February
28,
2005
Issuance
date:
December
16,
2003
Paul
E.
Davis,
Director
Division
of
Water
Pollution
Control
ii
CN­
0759
RDAs
2352
and
2366
i
TABLE
OF
CONTENTS
Page
PART
I
A.
EFFLUENT
LIMITATIONS
AND
MONITORING
REQUIREMENTS
...............................
1
B.
MONITORING
PROCEDURES
.....................................................................................
4
1.
Representative
Sampling...........................................................................................
4
2.
Sampling
Frequency
..................................................................................................
4
3.
Test
Procedures.........................................................................................................
4
4.
Recording
of
Results..................................................................................................
5
5.
Records
Retention
.....................................................................................................
5
C.
DEFINITIONS................................................................................................................
5
D.
REPORTING.................................................................................................................
6
1.
Monitoring
Results
.....................................................................................................
6
2.
Additional
Monitoring
by
Permittee
............................................................................
7
3.
Falsifying
Reports
......................................................................................................
7
E.
SCHEDULE
OF
COMPLIANCE.....................................................................................
7
PART
II
A.
GENERAL
PROVISIONS
..............................................................................................
7
1.
Duty
to
Reapply
.........................................................................................................
7
2.
Right
of
Entry
.............................................................................................................
7
3.
Availability
of
Reports
................................................................................................
8
4.
Proper
Operation
and
Maintenance...........................................................................
8
5.
Treatment
Facility
Failure...........................................................................................
8
6.
Property
Rights
..........................................................................................................
8
7.
Severability
................................................................................................................
9
8.
Other
Information.......................................................................................................
9
B.
CHANGES
AFFECTING
THE
PERMIT
......................................................................
9
1.
Planned
Changes
......................................................................................................
9
2.
Permit
Modification,
Revocation,
or
Termination........................................................
9
3.
Change
of
Ownership
..............................................................................................
10
4.
Change
of
Mailing
Address......................................................................................
10
ii
C.
NONCOMPLIANCE.....................................................................................................
10
1.
Effect
of
Noncompliance..........................................................................................
10
2.
Reporting
of
Noncompliance....................................................................................
11
3.
Overflow...................................................................................................................
11
4.
Upset
.......................................................................................................................
12
5.
Adverse
Impact
........................................................................................................
13
6.
Bypass
.....................................................................................................................
13
7.
Washout
..................................................................................................................
14
D.
LIABILITIES.................................................................................................................
14
1.
Civil
and
Criminal
Liability
........................................................................................
14
2.
Liability
Under
State
Law
.........................................................................................
14
PART
III
A.
TOXIC
POLLUTANTS
................................................................................................
14
B.
REOPENER
CLAUSE................................................................................................
15
C.
PLACEMENT
OF
SIGNS...........................................................................................
15
D.
ANTIDEGRADATION..................................................................................................
16
E.
BIOMONITORING
REQUIREMENTS.........................................................................
16
PART
IV
STORM
WATER
POLLUTION
PREVENTION
PLAN
A.
PLAN
IMPLEMENTATION........................................................................................
19
B.
PLAN
AVAILABILITY................................................................................................
19
C.
PLAN
MODIFICATION
.............................................................................................
19
D.
MONITORING
PLAN................................................................................................
19
PART
V
WASTELOAD
ALLOCATION
STUDY
FOR
SIMS
BRANCH
1.0
INTRODUCTION
...............................................................................................
30
1.1
Background
.......................................................................................................
30
1.2
Purpose.............................................................................................................
30
iii
1.3
Scope
of
Work
..................................................................................................
32
2.0
WASTELOAD
ALLOCATION
STUDY
...............................................................
33
2.1
Work
Plan..........................................................................................................
33
2.2
Reconnaissance
Field
Survey...........................................................................
33
2.3
Time­
of­
travel
Surveys
......................................................................................
34
2.4
Calibrate
Water
Quality
Model...........................................................................
38
2.5
Continuous
Monitoring.......................................................................................
40
2.6
Model
Validation................................................................................................
40
2.7
Wasteload
Allocation
Modeling
.........................................................................
40
2.8
Final
Report.......................................................................................................
41
3.0
SCHEDULE.......................................................................................................
42
ADDENDUM
TO
RATIONALE
dated
September
18,
2003
A­
1
to
A­
8
RATIONALE
I
DISCHARGER........................................................................................................
R­
1
II
PERMIT
STATUS....................................................................................................
R­
1
III
FACILITY
DISCHARGES
AND
RECEIVING
WATERS...........................................
R­
2
IV
APPLICABLE
EFFLUENT
LIMITATIONS
GUIDELINES..........................................
R­
2
V
PREVIOUS
PERMIT
LIMITS
AND
MONITORING
REQUIREMENTS......................
R­
2
VI
HISTORICAL
MONITORING
AND
INSPECTION
....................................................
R­
3
VII
NEW
PERMIT
LIMITS
AND
MONITORING
REQUIREMENTS................................
R­
4
VIII
BIOMONITORING
REQUIREMENTS
....................................................................
R­
11
IX
ANTIDEGRADATION
............................................................................................
R­
12
X
PERMIT
DURATION.............................................................................................
R­
13
APPENDIX
1.
FACILITY
DISCHARGES
AND
RECEIVING
WATERS............................................
R­
14
2.
PREVIOUS
PERMIT
LIMITS
AND
MONITORING
REQUIREMENTS
......................
R­
19
3.
HISTORICAL
MONITORING
AND
INSPECTION.....................................................
R­
21
iv
4.
NEW
PERMIT
LIMITS..............................................................................................
R­
29
VMJ
TN0064041.
DOC
Metro
Nashville
Airport
Authority
(
MNAA)
NPDES
Permit
TN0064041
Page
1
of
40
PART
I
__________________________________________________________________________

A.
EFFLUENT
LIMITATIONS
AND
MONITORING
REQUIREMENTS
Metro
Nashville
Airport
Authority
is
authorized
to
discharge
treated
aircraft
deicing
fluid
and
storm
water
runoff
from
Outfall
002,
overflow
from
South
and
North
Ponds
from
Outfalls
003
and
004,
and
storm
water
runoff
from
Outfalls
SW1
through
S11
to
Sims
Branch
at
miles
1.8
to
Mill
Creek
at
mile
1.6
to
the
Cumberland
River
at
mile
194.5
(
Outfall
002);
Sims
Branch
at
miles
1.9
and
2.0
(
Outfalls
003
and
004),
McCrory
Creek
to
Stones
River
at
mile
5.8
(
Outfall
SW1),
Sims
Branch
to
Mill
Creek
at
mile
1.6
to
the
Cumberland
River
at
mile
194.5
(
Outfalls
SW2,
SW3,
SW4,
SW5,
&
SW6);
and
Mill
Creek
to
the
Cumberland
River
at
mile
194.5
(
Outfalls
SW7,
S10,
&
S11).
These
discharges
shall
be
limited
and
monitored
by
the
permittee
as
specified
below:
PERMIT
LIMITS
­
OUTFALL002
EFFLUENT
LIMITATIONS
MONITORING
MONTHLY
DAILY
REQUIREMENTS
EFFLUENT
AVG.
CONC.
AVG.
AMNT.
MAX.
CONC.
MAX.
AMNT.
MSRMNT.
SAMPLE
CHARACTERISTIC
(
mg/
l)
(
lb/
day)
(
mg/
l)
(
lb/
day)
FRQNCY.
TYPE
FLOW
Report
(
MGD)
*
Report
(
MGD)
*
1/
Week
Instantaneous
pH**
Range
6.0
­
9.0
1/
Week
Grab
COD
­­
­­
Report
­­
1/
Week
Grab
TOTAL
SUSPENDED
SOLIDS
(
TSS)
30.0
­­
Report
­­
1/
Month
Grab
OIL
&
GREASE
10.0
­­
15.0
­­
1/
Month
Grab
DISSOLVED
OXYGEN
(
D.
O.)
­­
­­
6.0
Minimum
­­
1/
Week
Grab
TEMPERATURE,
Effluent
Report
Effluent
Temperature
1/
Week
Grab
NITROGEN,
AMMONIA
TOTAL
1.0
­­
2.0
­­
1/
Week
Grab
RECEIVING
STREAM
FLOW
***
1/
Week
Grab
48­
HR
LC50
Survival,
Reproduction,
&
Growth
in
100%
Effluent
1/
Quarter
Composite
****

CBOD5
3.0
­­
4.5
­­
1/
Month
Grab
CBOD5
6.0
­­
9.0
­­
1/
Month
Grab
CBOD5
12.0
­­
18.0
­­
1/
Month
Grab
CBOD5
Report
­­
Report
­­
1/
Month
Grab
CBOD5
25.0
­­
37.5
­­
1/
Week
Grab
CBOD5
45.0
­­
67.5
­­
1/
Week
Grab
CBOD5
65.0
­­
97.5
­­
1/
Week
Grab
CBOD5
65.0
­­
Report
­­
1/
Week
Grab
Report
(
CFS)

Receiving
Stream
Flow
>
1.0
CFS
and
<
3.0
CFS
Receiving
Stream
Flow
>
0.5
CFS
and
<
1
CFS
Receiving
Stream
Flow
>
3
CFS
Summer
(
May
1
through
September
30)
Maximum
Receiving
Stream
Temperature:
22
°
C
Receiving
Stream
Flow
>
0.5
CFS
and
<
1.0
CFS
Receiving
Stream
Flow
>
1
CFS
and
<
1.5
CFS
Receiving
Stream
Flow
>
0
CFS
and
<
0.5
CFS
*****

Winter
(
October
1
through
April
30)
Maximum
Receiving
Stream
Temperature:
17
°
C
Receiving
Stream
Flow
>
0
CFS
and
<
0.5
CFS
Receiving
Stream
Flow
>
1.5
CFS
*
Flow
shall
be
reported
in
Million
Gallons
per
Day
(
MGD).
**
pH
analyses
shall
be
performed
within
fifteen
(
15)
minutes
of
sample
collection.
***
Receiving
stream
flow
is
based
on
a
24­
hour
average
value.
Receiving
stream
flow
will
be
measured
at
a
location,
and
using
methods
approved
by
the
division.
****
To
be
conducted
once
in
each
quarter
(
Jan­
Mar;
Apr­
Jun;
Jul­
Sep;
Oct­
Dec)
during
which
aircraft
deicing
is/
has
occurred.
See
Part
III
for
methodology.
*****
Permittee
should
make
every
effort
to
prevent
discharge
when
the
flow
of
Sims
Branch
is
below
0.5
cfs.
However,
if
discharge
is
necessary,
these
limits
apply.
Metro
Nashville
Airport
Authority
(
MNAA)
NPDES
Permit
TN0064041
Page
2
of
40
Metro
Nashville
Airport
Authority
(
MNAA)
NPDES
Permit
TN0064041
Page
3
of
40
Additional
monitoring
requirements
and
conditions
applicable
to
all
outfalls
include:

There
shall
be
no
distinctly
visible
floating
scum,
oil
or
other
matter
contained
in
the
wastewater
discharge.
The
wastewater
discharge
must
not
cause
an
objectionable
color
contrast
in
the
receiving
stream.

The
wastewater
discharge
shall
not
contain
pollutants
in
quantities
that
will
be
hazardous
or
otherwise
detrimental
to
humans,
livestock,
wildlife,
plant
life,
or
fish
and
aquatic
life
in
the
receiving
stream.

Sludge
or
any
other
material
removed
by
any
treatment
works
must
be
disposed
of
in
a
manner
which
prevents
its
entrance
into
or
pollution
of
any
surface
or
subsurface
waters.
PERMIT
LIMITS
OUTFALL
004
EFFLUENT
LIMITATIONS
MONITORING
MONTHLY
DAILY
REQUIREMENTS
EFFLUENT
AVG.
CONC.
AVG.
AMNT.
MAX.
CONC.
MAX.
AMNT.
MSRMNT.
SAMPLE
CHARACTERISTIC
(
mg/
l)
(
lb/
day)
(
mg/
l)
(
lb/
day)
FRQNCY.
***
TYPE
FLOW
Report
(
MGD)
*
Report
(
MGD)
*
1/
Month
Estimate
pH**
Report
1/
Month
Grab
CBOD5
­­
­­
Report
­­
1/
Month
Grab
COD
­­
­­
Report
­­
1/
Month
Grab
TOTAL
SUSPENDED
SOLIDS
(
TSS)
­­
­­
Report
­­
1/
Month
Grab
OIL
&
GREASE
­­
­­
Report
­­
1/
Month
Grab
*
Flow
shall
be
reported
in
Million
Gallons
per
Day
(
MGD).
**
pH
analyses
shall
be
performed
within
fifteen
(
15)
minutes
of
sample
collection.
***
Once
per
month,
or
once
per
occurrence,
whicever
is
less
frequent.

PERMIT
LIMITS
EFFLUENT
LIMITATIONS
MONITORING
MONTHLY
DAILY
REQUIREMENTS
EFFLUENT
AVG.
CONC.
AVG.
AMNT.
MAX.
CONC.
MAX.
AMNT.
MSRMNT.
SAMPLE
CHARACTERISTIC
(
mg/
l)
(
lb/
day)
(
mg/
l)
(
lb/
day)
FRQNCY.
TYPE
***

FLOW
Report
(
MGD)
*
Report
(
MGD)
*
Semi­
annual
Estimate
pH
**
Report
Semi­
annual
Grab
CBOD5
­­
­­
Report
­­
Semi­
annual
Grab
COD
­­
­­
Report
­­
Semi­
annual
Grab
TOTAL
SUSPENDED
SOLIDS
(
TSS)
­­
­­
Report
­­
Semi­
annual
Grab
OIL
&
GREASE
­­
­­
Report
­­
Semi­
annual
Grab
*

**
pH
analyses
shall
be
performed
within
fifteen
(
15)
minutes
of
sample
collection.

***
OUTFALL
SW1
­
Storm
Water
(
3,192
acres)
OUTFALL
SW2
­
Storm
Water
(
960
acres)
OUTFALL
SW7
­
Storm
Water
(
492
acres)

The
permittee
shall
provide
the
date
and
duration
(
in
hours)
of
the
qualifying
storm
event(
s)
sampled;
rainfall
measurements
or
estimates
(
in
inches)
of
the
storm
event
that
generated
the
sampled
runoff;
the
duration
between
the
storm
event
sampled
and
the
end
of
the
previous
measurable
(
greater
than
0.1
inch
rainfall)
storm
event;
and
an
estimate
of
the
total
volume
of
the
discharge
sampled.
Flow
shall
be
reported
in
Million
Gallons
per
Day
(
MGD).

Samples
shall
be
collected
within
30
minutes
of
initiation
of
flow
during
a
storm
event
that
is
greater
than
0.1
inches,
and
that
occurs
at
least
72
hours
after
any
previous
storm
event
with
rainfall
of
0.1
inches
or
greater.

Note:
Storm
water
runoff
from
Outfalls
SW1,
SW2,
&
SW7
is
considered
to
be
representative
of
storm
water
runoff
from
Outfalls
SW1
through
S11.
Metro
Nashville
Airport
Authority
(
MNAA)
NPDES
Permit
TN0064041
Page
4
of
40
Additionally,
the
disposal
of
such
sludge
or
other
material
must
be
in
compliance
with
the
Tennessee
Solid
Waste
Disposal
Act,
TCA
68­
31­
101
et
seq.
and
the
Tennessee
Hazardous
Waste
Management
Act,
TCA
68­
46­
101
et
seq.

Surfactants
in
the
oil/
water
separator
would
inhibit
separation
of
oil
from
water.
The
Division
proposes
for
MNAA
to
use
Best
Management
Practices
(
BMPs)
in
the
use
of
soaps
and
detergents
(
if
used
in
the
equipment
cleaning)
that
may
enter
the
oil/
water
separator
as
part
of
their
overall
facility
Storm
Water
Pollution
Prevention
Plan
(
SWPPP).

The
design,
installation,
and
exact
location
of
in­
stream
flow
monitoring
system(
s)
for
purposes
of
complying
with
monitoring
requirements
and
effluent
limitations
at
Outfall
002
should
be
done
in
consultation
with
and
upon
approval
of
the
Division's
personnel
in
Environmental
Assistance
Center
­
Nashville.

B.
MONITORING
PROCEDURES
1.
Representative
Sampling
Samples
and
measurements
taken
in
compliance
with
the
monitoring
requirements
specified
herein
for
Outfalls
002
and
004
shall
be
representative
of
the
volume
and
nature
of
the
monitored
discharge,
and
shall
be
taken
after
treatment
and
prior
to
mixing
with
uncontaminated
storm
water
runoff
or
the
receiving
stream.
Samples
and
measurements
taken
in
compliance
with
the
monitoring
requirements
specified
herein
for
Outfalls
SW1,
SW2,
and
SW7
shall
be
representative
of
the
volume
and
nature
of
the
storm
water
runoff.

2.
Sampling
Frequency
Where
the
permit
requires
sampling
and
monitoring
of
a
particular
effluent
characteristic(
s)
at
a
frequency
of
less
than
once
per
day
or
daily,
the
permittee
is
precluded
from
marking
the
"
No
Discharge"
block
on
the
Discharge
Monitoring
Report
if
there
has
been
any
discharge
from
that
particular
outfall
during
the
period
which
coincides
with
the
required
monitoring
frequency,
i.
e.
if
the
required
monitoring
frequency
is
once
per
month
or
1/
month,
the
monitoring
period
is
one
month,
and
if
the
discharge
occurs
during
only
one
day
in
that
period
then
the
permittee
must
sample
on
that
day
and
report
the
results
of
analyses
accordingly.

3.
Test
Procedures
a.
Test
procedures
for
the
analysis
of
pollutants
shall
conform
to
regulations
published
pursuant
to
Section
304
(
h)
of
the
Clean
Water
Act
(
the
"
Act"),
as
amended,
under
which
such
procedures
may
be
required.

b.
Unless
otherwise
noted
in
the
permit,
all
pollutant
parameters
shall
be
determined
according
to
methods
prescribed
in
Title
40,
CFR,
Part
136,
as
amended,
promulgated
pursuant
to
Section
304
(
h)
of
the
Act.
Metro
Nashville
Airport
Authority
(
MNAA)
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4.
Recording
of
Results
For
each
measurement
or
sample
taken
pursuant
to
the
requirements
of
this
permit,
the
permittee
shall
record
the
following
information:

a.
The
exact
place,
date
and
time
of
sampling;

b.
The
exact
person(
s)
collecting
samples;

c.
The
dates
and
times
the
analyses
were
performed;

d.
The
person(
s)
or
laboratory
who
performed
the
analyses;

e.
The
analytical
techniques
or
methods
used,
and;

f.
The
results
of
all
required
analyses.

5.
Records
Retention
All
records
and
information
resulting
from
the
monitoring
activities
required
by
this
permit
including
all
records
of
analyses
performed
and
calibration
and
maintenance
of
instrumentation
shall
be
retained
for
a
minimum
of
three
(
3)
years,
or
longer,
if
requested
by
the
Division
of
Water
Pollution
Control.

C.
DEFINITIONS
The
Daily
Maximum
Concentration
is
a
limitation
on
the
average
concentration,
in
milligrams
per
liter
(
mg/
L),
of
the
discharge
during
any
calendar
day.
When
a
proportional­
toflow
composite
sampling
device
is
used,
the
daily
concentration
is
the
concentration
of
that
24­
hour
composite;
when
other
sampling
means
are
used,
the
daily
concentration
is
the
arithmetic
mean
of
the
concentrations
of
equal
volume
samples
collected
during
any
calendar
day
or
sampling
period.

The
Monthly
Average
Concentration,
a
limitation
on
the
discharge
concentration,
in
milligrams
per
liter
(
mg/
L),
is
the
arithmetic
mean
of
all
daily
concentrations
determined
in
a
one­
month
period.
For
the
purpose
of
this
definition,
a
frequency
of
2/
Month
is
representative
of
2
separate
daily
samples,
each
sample
having
been
collected
on
a
separate
day
during
the
monitoring
period.

The
Instantaneous
Concentration
(
Minimum
or
Maximum)
is
a
limitation
on
the
concentration,
in
milligrams
per
liter
(
mg/
L),
or
other
appropriate
units,
of
any
pollutant
contained
in
the
discharge
determined
from
a
grab
sample
taken
at
any
point
in
time.

A
Composite
Sample,
for
the
purposes
of
this
permit,
is
a
sample
collected
continually
over
a
period
of
24
hours
at
a
rate
proportional
to
the
flow.
Composite
sample
should
be
a
combination
of
at
least
8
sample
aliquots
of
at
least
100
milliliters,
collected
at
periodic
intervals
during
the
operating
hours
of
a
facility
over
a
24
hour
period.
Metro
Nashville
Airport
Authority
(
MNAA)
NPDES
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A
Grab
Sample,
for
the
purposes
of
this
permit,
is
defined
as
a
single
effluent
sample
of
at
least
100
milliliters
collected
at
a
randomly­
selected
time
over
a
period
not
exceeding
15
minutes.
The
sample(
s)
shall
be
collected
at
the
period(
s)
most
representative
of
the
total
discharge.

For
the
purpose
of
this
permit,
a
Calendar
Day
is
defined
as
any
24­
hour
period.

For
the
purpose
of
this
permit,
a
Quarter
is
defined
as
any
one
of
the
following
three
month
periods:
January
1
through
March
31,
April
1
through
June
30,
July
1
through
September
30,
or
October
1
through
December
31.

For
the
purpose
of
this
permit,
Semi­
annually
means
the
same
as
"
once
every
six
months."
Measurements
of
the
effluent
characteristics
concentrations
may
be
made
anytime
during
a
6
month
period
beginning
from
the
issuance
date
of
this
permit
so
long
as
the
second
set
of
measurements
for
a
given
12
month
period
are
made
approximately
6
months
subsequent
to
that
time,
if
feasible.

For
the
purpose
of
this
permit,
Annually
is
defined
as
a
monitoring
frequency
of
once
every
twelve
(
12)
months
beginning
with
the
date
of
issuance
of
this
permit
so
long
as
the
following
set
of
measurements
for
a
given
12
month
period
are
made
approximately
12
months
subsequent
to
that
time.

A
Qualifying
Storm
Event
is
one
which
is
greater
than
0.1
inches
and
that
occurs
after
a
period
of
at
least
72
hours
after
any
previous
storm
event
with
rainfall
of
0.1
inches
or
greater.

D.
REPORTING
1.
Monitoring
Results
Monitoring
results
shall
be
recorded
monthly
and
submitted
monthly
for
Outfalls
002
and
004
using
Discharge
Monitoring
Report
(
DMR)
forms
supplied
by
the
Division
of
Water
Pollution
Control.
Likewise,
DMRs
shall
be
recorded
semi­
annually
and
submitted
semiannually
for
Outfalls
SW1,
SW2,
and
SW7.
Submittals
shall
be
postmarked
no
later
than
15
days
after
the
completion
of
the
reporting
period.
The
top
two
copies
of
each
report
are
to
be
submitted.
A
copy
should
be
retained
for
the
permittee's
files.
DMRs
and
any
communication
regarding
compliance
with
the
conditions
of
this
permit
must
be
sent
to:

TENNESSEE
DEPT.
OF
ENVIRONMENT
&
CONSERVATION
DIVISION
OF
WATER
POLLUTION
CONTROL
COMPLIANCE
REVIEW
SECTION
401
CHURCH
STREET
L
&
C
ANNEX
6TH
FLOOR
NASHVILLE
TN
37243­
1534
The
first
DMR
is
due
February
15,
2004.

DMRs
must
be
signed
and
certified
by
a
responsible
corporate
officer
as
defined
in
40
CFR
122.22,
a
general
partner
or
proprietor,
or
a
principal
municipal
executive
officer
or
Metro
Nashville
Airport
Authority
(
MNAA)
NPDES
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40
ranking
elected
official,
or
his
duly
authorized
representative.
Such
authorization
must
be
submitted
in
writing
and
must
explain
the
duties
and
responsibilities
of
the
authorized
representative.

The
electronic
submission
of
DMRs
will
be
accepted
only
if
approved
in
writing
by
the
Division.
For
purposes
of
determining
compliance
with
this
permit,
data
submitted
in
electronic
format
will
carry
the
same
weight
as
data
submitted
on
signed
and
certified
DMR
forms.

2.
Additional
Monitoring
by
Permittee
If
the
permittee
monitors
any
pollutant
specifically
limited
by
this
permit
more
frequently
than
required
at
the
location(
s)
designated,
using
approved
analytical
methods
as
specified
herein,
the
results
of
such
monitoring
shall
be
included
in
the
calculation
and
reporting
of
the
values
required
in
the
DMR
form.
Such
increased
frequency
shall
also
be
indicated
on
the
form.

3.
Falsifying
Reports
Knowingly
making
any
false
statement
on
any
report
required
by
this
permit
may
result
in
the
imposition
of
criminal
penalties
as
provided
for
in
Section
309
of
the
Federal
Water
Pollution
Control
Act,
as
amended,
and
in
Section
69­
3­
115
of
the
Tennessee
Water
Quality
Control
Act.

E.
SCHEDULE
OF
COMPLIANCE
Full
compliance
and
operational
levels
shall
be
attained
from
the
effective
date
of
this
permit.

PART
II
__________________________________________________________________________

A.
GENERAL
PROVISIONS
1.
Duty
to
Reapply
Permittee
is
not
authorized
to
discharge
after
the
expiration
date
of
this
permit.
In
order
to
receive
authorization
to
discharge
beyond
the
expiration
date,
the
permittee
shall
submit
such
information
and
forms
as
are
required
to
the
Director
of
Water
Pollution
Control
(
the
"
Director")
no
later
than
180
days
prior
to
the
expiration
date.

2.
Right
of
Entry
The
permittee
shall
allow
the
Director,
the
Regional
Administrator
of
the
U.
S.
Environmental
Protection
Agency,
or
their
authorized
representatives,
upon
the
presentation
of
credentials:
Metro
Nashville
Airport
Authority
(
MNAA)
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a.
To
enter
upon
the
permittee's
premises
where
an
effluent
source
is
located
or
where
records
are
required
to
be
kept
under
the
terms
and
conditions
of
this
permit,
and
at
reasonable
times
to
copy
these
records;

b.
To
inspect
at
reasonable
times
any
monitoring
equipment
or
method
or
any
collection,
treatment,
pollution
management,
or
discharge
facilities
required
under
this
permit;
and
c.
To
sample
at
reasonable
times
any
discharge
of
pollutants.

3.
Availability
of
Reports
Except
for
data
determined
to
be
confidential
under
Section
308
of
the
Federal
Water
Pollution
Control
Act,
as
amended,
all
reports
prepared
in
accordance
with
the
terms
of
this
permit
shall
be
available
for
public
inspection
at
the
offices
of
the
Division
of
Water
Pollution
Control.
As
required
by
the
Federal
Act,
effluent
data
shall
not
be
considered
confidential.

4.
Proper
Operation
and
Maintenance
a.
The
permittee
shall
at
all
times
properly
operate
and
maintain
all
facilities
and
systems
(
and
related
appurtenances)
for
collection
and
treatment
which
are
installed
or
used
by
the
permittee
to
achieve
compliance
with
the
terms
and
conditions
of
this
permit.
Proper
operation
and
maintenance
also
includes
adequate
laboratory
and
process
controls
and
appropriate
quality
assurance
procedures.
This
provision
requires
the
operation
of
backup
or
auxiliary
facilities
or
similar
systems
which
are
installed
by
a
permittee
only
when
the
operation
is
necessary
to
achieve
compliance
with
the
conditions
of
the
permit.
Backup
continuous
pH
and
flow
monitoring
equipment
are
not
required.

b.
Dilution
water
shall
not
be
added
to
comply
with
effluent
requirements
to
achieve
BCT,
BPT,
BAT
and
or
other
technology
based
effluent
limitations
such
as
those
in
State
of
Tennessee
Rule
1200­
4­
5­.
03.

5.
Treatment
Facility
Failure
The
permittee,
in
order
to
maintain
compliance
with
this
permit,
shall
control
production,
all
discharges,
or
both,
upon
reduction,
loss,
or
failure
of
the
treatment
facility,
until
the
facility
is
restored
or
an
alternative
method
of
treatment
is
provided.
This
requirement
applies
in
such
situations
as
the
reduction,
loss,
or
failure
of
the
primary
source
of
power.

6.
Property
Rights
The
issuance
of
this
permit
does
not
convey
any
property
rights
in
either
real
or
personal
property,
or
any
exclusive
privileges,
nor
does
it
authorize
any
injury
to
private
property
or
any
invasion
of
personal
rights,
nor
any
infringement
of
Federal,
State,
or
local
laws
or
regulations.
Metro
Nashville
Airport
Authority
(
MNAA)
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7.
Severability
The
provisions
of
this
permit
are
severable.
If
any
provision
of
this
permit
due
to
any
circumstance,
is
held
invalid,
then
the
application
of
such
provision
to
other
circumstances
and
to
the
remainder
of
this
permit
shall
not
be
affected
thereby.

8.
Other
Information
If
the
permittee
becomes
aware
that
he
failed
to
submit
any
relevant
facts
in
a
permit
application,
or
submitted
incorrect
information
in
a
permit
application
or
in
any
report
to
the
Director,
then
he
shall
promptly
submit
such
facts
or
information.

B.
CHANGES
AFFECTING
THE
PERMIT
1.
Planned
Changes
The
permittee
shall
give
notice
to
the
Director
as
soon
as
possible
of
any
planned
physical
alterations
or
additions
to
the
permitted
facility.
Notice
is
required
only
when:

a.
The
alteration
or
addition
to
a
permitted
facility
may
meet
one
of
the
criteria
for
determining
whether
a
facility
is
a
new
source
in
40
CFR
122.29(
b);
or
b.
The
alteration
or
addition
could
significantly
change
the
nature
or
increase
the
quantity
of
pollutants
discharged.
This
notification
applies
to
pollutants
which
are
subject
neither
to
effluent
limitations
in
the
permit,
nor
to
notification
requirements
under
40
CFR
122.42(
a)(
1).

2.
Permit
Modification,
Revocation,
or
Termination
a.
This
permit
may
be
modified,
revoked
and
reissued,
or
terminated
for
cause
as
described
in
40
CFR
122.62
and
122.64,
Federal
Register,
Volume
49,
No.
188
(
Wednesday,
September
26,
1984),
as
amended.

b.
The
permittee
shall
furnish
to
the
Director,
within
a
reasonable
time,
any
information
which
the
Director
may
request
to
determine
whether
cause
exists
for
modifying,
revoking
and
reissuing,
or
terminating
this
permit,
or
to
determine
compliance
with
this
permit.
The
permittee
shall
also
furnish
to
the
Director,
upon
request,
copies
of
records
required
to
be
kept
by
this
permit.

c.
If
any
applicable
effluent
standard
or
prohibition
(
including
any
schedule
of
compliance
specified
in
such
effluent
standard
or
prohibition)
is
established
for
any
toxic
pollutant
under
Section
307(
a)
of
the
Federal
Water
Pollution
Control
Act,
as
amended,
the
Director
shall
modify
or
revoke
and
reissue
the
permit
to
conform
to
the
prohibition
or
to
the
effluent
standard,
providing
that
the
effluent
standard
is
more
stringent
than
the
limitation
in
the
permit
on
the
toxic
pollutant.
The
permittee
shall
comply
with
these
effluent
standards
or
prohibitions
within
the
time
provided
in
the
regulations
that
establish
these
standards
or
prohibitions,
even
if
the
permit
has
not
yet
been
modified
or
revoked
and
reissued
to
incorporate
the
requirement.
Metro
Nashville
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Authority
(
MNAA)
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3.
Change
of
Ownership
This
permit
may
be
transferred
to
another
party
(
provided
there
are
neither
modifications
to
the
facility
or
it's
operations,
nor
any
other
changes
which
might
affect
the
permit
limits
and
conditions
contained
in
the
permit)
by
the
permittee
if:

a.
The
permittee
notifies
the
Director
of
the
proposed
transfer
at
least
30
days
in
advance
of
the
proposed
transfer
date;

b.
The
notice
includes
a
written
agreement
between
the
existing
and
new
permittees
containing
a
specified
date
for
transfer
of
permit
responsibility,
coverage,
and
liability
between
them;
and
c.
The
Director,
within
30
days,
does
not
notify
the
current
permittee
and
the
new
permittee
of
his
intent
to
modify,
revoke
or
reissue,
or
terminate
the
permit
and
to
require
that
a
new
application
be
filed
rather
than
agreeing
to
the
transfer
of
the
permit.

Pursuant
to
the
requirements
of
40
CFR
122.61,
concerning
transfer
of
ownership,
the
permittee
must
provide
the
following
information
to
the
Division
in
their
formal
notice
of
intent
to
transfer
ownership:
1)
the
NPDES
permit
number
of
the
subject
permit;
2)
the
effective
date
of
the
proposed
transfer;
3)
the
name
and
address
of
the
transferor;
4)
the
name
and
address
of
the
transferee;
5)
the
names
of
the
responsible
parties
for
both
the
transferor
and
transferee;
6)
a
statement
that
the
transferee
assumes
responsibility
for
the
subject
NPDES
permit;
7)
a
statement
that
the
transferor
relinquishes
responsibility
for
the
subject
NPDES
permit;
8)
the
signatures
of
the
responsible
parties
for
both
the
transferor
and
transferee
pursuant
to
the
requirements
of
40
CFR
122.22(
a),
"
Signatories
to
permit
applications";
and,
9)
a
statement
regarding
any
proposed
modifications
to
the
facility,
it's
operations,
or
any
other
changes
which
might
affect
the
permit
limits
and
conditions
contained
in
the
permit.

4.
Change
of
Mailing
Address
The
permittee
shall
promptly
provide
to
the
Director
written
notice
of
any
change
of
mailing
address.
In
the
absence
of
such
notice
the
original
address
of
the
permittee
will
be
assumed
to
be
correct.

C.
NONCOMPLIANCE
1.
Effect
of
Noncompliance
All
discharges
shall
be
consistent
with
the
terms
and
conditions
of
this
permit.
Any
permit
noncompliance
constitutes
a
violation
of
applicable
State
and
Federal
laws
and
is
grounds
for
enforcement
action,
permit
termination,
permit
modification,
or
denial
of
permit
reissuance.
Metro
Nashville
Airport
Authority
(
MNAA)
NPDES
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40
2.
Reporting
of
Noncompliance
a.
24­
Hour
Reporting
In
the
case
of
any
noncompliance
which
could
cause
a
threat
to
public
drinking
supplies,
or
any
other
discharge
which
could
constitute
a
threat
to
human
health
or
the
environment,
the
required
notice
of
non­
compliance
shall
be
provided
to
the
Division
of
Water
Pollution
Control
in
the
appropriate
Environmental
Assistance
Center
within
24
hours
from
the
time
the
permittee
becomes
aware
of
the
circumstances.
(
The
Environmental
Assistance
Center
should
be
contacted
for
names
and
phone
numbers
of
environmental
response
personnel).

A
written
submission
must
be
provided
within
five
days
of
the
time
the
permittee
becomes
aware
of
the
circumstances
unless
this
requirement
is
waived
by
the
Director
on
a
case­
by­
case
basis.
The
permittee
shall
provide
the
Director
with
the
following
information:

i.
A
description
of
the
discharge
and
cause
of
noncompliance;

ii.
The
period
of
noncompliance,
including
exact
dates
and
times
or,
if
not
corrected,
the
anticipated
time
the
noncompliance
is
expected
to
continue;
and
iii.
The
steps
being
taken
to
reduce,
eliminate,
and
prevent
recurrence
of
the
noncomplying
discharge.

b.
Scheduled
Reporting
For
instances
of
noncompliance
which
are
not
reported
under
subparagraph
2.
a.
above,
the
permittee
shall
report
the
noncompliance
on
the
Discharge
Monitoring
Report.
The
report
shall
contain
all
information
concerning
the
steps
taken,
or
planned,
to
reduce,
eliminate,
and
prevent
recurrence
of
the
violation
and
the
anticipated
time
the
violation
is
expected
to
continue.

3.
Overflow
a.
"
Overflow"
means
the
discharge
of
wastes
from
any
portion
of
the
collection
or
treatment
system
other
than
through
permitted
outfalls.
"
Severe
property
damage"
means
substantial
physical
damage
to
property,
damage
to
the
treatment
facilities
which
would
cause
them
to
become
inoperable,
or
substantial
and
permanent
loss
of
natural
resources
which
can
reasonably
be
expected
to
occur
in
the
absence
of
an
overflow.
Severe
property
damage
does
not
mean
economic
loss
caused
by
delays
in
production.

b.
Both
sanitary
sewer
overflows
and
dry­
weather
overflows
are
prohibited
unless
the
following
three
(
3)
conditions
are
met:

i.
The
overflow
is
unavoidable
to
prevent
loss
of
life,
personal
injury,
or
severe
property
damage;

ii.
There
are
no
feasible
alternatives
to
overflow,
such
as
the
use
of
auxiliary
treatment
facilities,
retention
of
untreated
wastes,
or
maintenance
Metro
Nashville
Airport
Authority
(
MNAA)
NPDES
Permit
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40
during
normal
periods
of
equipment
down­
time.
This
condition
is
not
satisfied
if
adequate
back­
up
equipment
should
have
been
installed
in
the
exercise
of
reasonable
engineering
judgment
to
prevent
an
overflow
which
occurred
during
normal
periods
of
equipment
down­
time
or
preventative
maintenance;

iii.
The
permittee
submits
notice
of
an
unanticipated
overflow
to
the
Division
of
Water
Pollution
Control
in
the
appropriate
environmental
assistance
center
within
24
hours
of
becoming
aware
of
the
overflow
(
if
this
information
is
provided
orally,
a
written
submission
must
be
provided
within
five
days).
When
the
need
for
the
overflow
is
foreseeable,
prior
notification
shall
be
submitted
to
the
Director,
if
possible,
at
least
ten
(
10)
days
before
the
date
of
the
overflow.

c.
The
permittee
shall
operate
the
collection
system
so
as
to
avoid
overflows.
No
new
or
additional
flows
shall
be
allowed
that
will
contribute
to
overflow
discharges
or
would
otherwise
overload
any
portion
of
the
system.
No
new
or
additional
flows
shall
be
added
upstream
of
any
point
in
the
collection
system
which
experiences
chronic
overflows
(
greater
than
5
events
per
year)
or
would
otherwise
overload
any
portion
of
the
system.
Unless
there
is
specific
enforcement
action
to
the
contrary,
the
permittee
is
relieved
of
this
requirement
after:
1)
an
authorized
representative
of
the
Commissioner
of
the
Department
of
Environment
and
Conservation
has
approved
an
engineering
report
and
construction
plans
and
specifications
prepared
in
accordance
with
accepted
engineering
practices
for
correction
of
the
problem;
2)
the
correction
work
is
underway;
and
3)
the
cumulative,
peak­
design,
flows
potentially
added
from
new
connections
and
line
extensions
upstream
of
any
chronic
bypass
point
are
less
than
or
proportional
to
the
amount
of
inflow
and
infiltration
removal
documented
upstream
of
that
point.
The
inflow
and
infiltration
reduction
must
be
measured
by
the
permittee
using
practices
that
are
customary
in
the
flow
measurement
industry
and
reported
in
an
attachment
to
a
Monthly
Operating
Report
submitted
to
the
local
TDEC
Environmental
Assistance
Center.
The
data
measurement
period
shall
be
sufficient
to
account
for
seasonal
rainfall
patterns
and
seasonal
groundwater
table
elevations.

4.
Upset
a.
"
Upset"
means
an
exceptional
incident
in
which
there
is
unintentional
and
temporary
noncompliance
with
technology­
based
effluent
limitations
because
of
factors
beyond
the
reasonable
control
of
the
permittee.
An
upset
does
not
include
noncompliance
to
the
extent
caused
by
operational
error,
improperly
designed
treatment
facilities,
inadequate
treatment
facilities,
lack
of
preventive
maintenance,
or
careless
or
improper
operation.

b.
An
upset
shall
constitute
an
affirmative
defense
to
an
action
brought
for
noncompliance
with
such
technology­
based
permit
effluent
limitations
if
the
permittee
demonstrates,
through
properly
signed,
contemporaneous
operating
logs,
or
other
relevant
evidence
that:

i.
An
upset
occurred
and
that
the
permittee
can
identify
the
cause(
s)
of
the
upset;
Metro
Nashville
Airport
Authority
(
MNAA)
NPDES
Permit
TN0064041
Page
13
of
40
ii.
The
permitted
facility
was
at
the
time
being
operated
in
a
prudent
and
workman­
like
manner
and
in
compliance
with
proper
operation
and
maintenance
procedures;

iii.
The
permittee
submitted
information
required
under
"
Reporting
of
Noncompliance"
within
24
hours
of
becoming
aware
of
the
upset
(
if
this
information
is
provided
orally,
a
written
submission
must
be
provided
within
five
days);
and
iv.
The
permittee
complied
with
any
remedial
measures
required
under
"
Adverse
Impact."

5.
Adverse
Impact
The
permittee
shall
take
all
reasonable
steps
to
minimize
any
adverse
impact
to
the
waters
of
Tennessee
resulting
from
noncompliance
with
this
permit,
including
such
accelerated
or
additional
monitoring
as
necessary
to
determine
the
nature
and
impact
of
the
noncomplying
discharge.
It
shall
not
be
a
defense
for
the
permittee
in
an
enforcement
action
that
it
would
have
been
necessary
to
halt
or
reduce
the
permitted
activity
in
order
to
maintain
compliance
with
the
conditions
of
this
permit.

6.
Bypass
a.
"
Bypass"
is
the
intentional
diversion
of
wastewater
away
from
any
portion
of
a
treatment
facility.

b.
Bypasses
are
prohibited
unless
the
following
three
(
3)
conditions
are
met:

i.
The
bypass
is
unavoidable
to
prevent
loss
of
life,
personal
injury,
or
severe
property
damage;

ii.
There
are
not
feasible
alternatives
to
bypass,
such
as
the
use
of
auxiliary
treatment
facilities,
retention
of
untreated
wastes,
or
maintenance
during
normal
periods
of
equipment
down­
time.
This
condition
is
not
satisfied
if
adequate
back­
up
equipment
should
have
been
installed
in
the
exercise
of
reasonable
engineering
judgment
to
prevent
a
bypass
which
occurred
during
normal
periods
of
equipment
down­
time
or
preventative
maintenance;

iii.
The
permittee
submits
notice
of
an
unanticipated
bypass
to
the
Division
of
Water
Pollution
Control
in
the
appropriate
environmental
assistance
center
within
24
hours
of
becoming
aware
of
the
bypass
(
if
this
information
is
provided
orally,
a
written
submission
must
be
provided
within
five
days).
When
the
need
for
the
bypass
is
foreseeable,
prior
notification
shall
be
submitted
to
the
Director,
if
possible,
at
least
ten
(
10)
days
before
the
date
of
the
overflow.

c.
Bypasses
not
exceeding
limitations
are
allowed
only
if
the
bypass
is
necessary
for
essential
maintenance
to
assure
efficient
operation.
All
other
bypasses
are
prohibited.
Allowable
bypasses
not
exceeding
limitations
are
not
subject
to
the
reporting
requirements
of
6.
b.
iii,
above.
Metro
Nashville
Airport
Authority
(
MNAA)
NPDES
Permit
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7.
Washout
a.
For
domestic
wastewater
plants
only,
a
"
washout"
shall
be
defined
as
loss
of
Mixed
Liquor
Suspended
Solids
(
MLSS)
of
30.00%
or
more.
This
refers
to
the
MLSS
in
the
aeration
basin(
s)
only.
This
does
not
include
MLSS
decrease
due
to
solids
wasting
to
the
sludge
disposal
system.
A
washout
can
be
caused
by
improper
operation
or
from
peak
flows
due
to
infiltration
and
inflow.

b.
A
washout
is
prohibited.
If
a
washout
occurs
the
permittee
must
report
the
incident
to
the
Division
of
Water
Pollution
Control
in
the
appropriate
Environmental
Assistance
Center
within
24
hours
by
telephone.
A
written
submission
must
be
provided
within
five
days.
The
washout
must
be
noted
on
the
discharge
monitoring
report.
Each
day
of
a
washout
is
a
separate
violation.

D.
LIABILITIES
1.
Civil
and
Criminal
Liability
Except
as
provided
in
permit
conditions
for
"
Bypassing,"
"
Overflow",
"
Upset,"
"
Diversion,"
and
"
Treatment
Facility
Failures,"
nothing
in
this
permit
shall
be
construed
to
relieve
the
permittee
from
civil
or
criminal
penalties
for
noncompliance.
Notwithstanding
this
permit,
the
permittee
shall
remain
liable
for
any
damages
sustained
by
the
State
of
Tennessee,
including
but
not
limited
to
fish
kills
and
losses
of
aquatic
life
and/
or
wildlife,
as
a
result
of
the
discharge
of
wastewater
to
any
surface
or
subsurface
waters.
Additionally,
notwithstanding
this
Permit,
it
shall
be
the
responsibility
of
the
permittee
to
conduct
its
wastewater
treatment
and/
or
discharge
activities
in
a
manner
such
that
public
or
private
nuisances
or
health
hazards
will
not
be
created.

2.
Liability
Under
State
Law
Nothing
in
this
permit
shall
be
construed
to
preclude
the
institution
of
any
legal
action
or
relieve
the
permittee
from
any
responsibilities,
liabilities,
or
penalties
established
pursuant
to
any
applicable
State
law
or
the
Federal
Water
Pollution
Control
Act,
as
amended.

PART
III
__________________________________________________________________________

OTHER
REQUIREMENTS
A.
TOXIC
POLLUTANTS
The
permittee
shall
notify
the
Division
of
Water
Pollution
Control
as
soon
as
it
knows
or
has
reason
to
believe:

1.
That
any
activity
has
occurred
or
will
occur
which
would
result
in
the
discharge
on
a
routine
or
frequent
basis,
of
any
toxic
substance(
s)
(
listed
at
40
CFR
122,
Appendix
D,
Table
II
Metro
Nashville
Airport
Authority
(
MNAA)
NPDES
Permit
TN0064041
Page
15
of
40
and
III)
which
is
not
limited
in
the
permit,
if
that
discharge
will
exceed
the
highest
of
the
following
"
notification
levels":

a.
One
hundred
micrograms
per
liter
(
100
ug/
l);

b.
Two
hundred
micrograms
per
liter
(
200
ug/
l)
for
acrolein
and
acrylonitrile;
five
hundred
micrograms
per
liter
(
500
ug/
l)
for
2,4­
dinitrophenol
and
for
2­
methyl­
4,6­
dinitrophenol;
and
one
milligram
per
liter
(
1
mg/
L)
for
antimony;

c.
Five
(
5)
times
the
maximum
concentration
value
reported
for
that
pollutant(
s)
in
the
permit
application
in
accordance
with
122.21(
g)(
7);
or
d.
The
level
established
by
the
Director
in
accordance
with
122.44(
f).

2.
That
any
activity
has
occurred
or
will
occur
which
would
result
in
any
discharge,
on
a
non­
routine
or
infrequent
basis,
of
a
toxic
pollutant
which
is
not
limited
in
the
permit,
if
that
discharge
will
exceed
the
highest
of
the
following
"
notification
levels":

a.
Five
hundred
micrograms
per
liter
(
500
ug/
l);

b.
One
milligram
per
liter
(
1
mg/
L)
for
antimony;

c.
Ten
(
10)
times
the
maximum
concentration
value
reported
for
that
pollutant
in
the
permit
application
in
accordance
with
122.21(
g)(
7);
or
d.
The
level
established
by
the
Director
in
accordance
with
122.44(
f).

B.
REOPENER
CLAUSE
If
an
applicable
standard
or
limitation
is
promulgated
under
Sections
301(
b)(
2)(
C)
and
(
D),
304(
B)(
2),
and
307(
a)(
2)
and
that
effluent
standard
or
limitation
is
more
stringent
than
any
effluent
limitation
in
the
permit
or
controls
a
pollutant
not
limited
in
the
permit,
the
permit
shall
be
promptly
modified
or
revoked
and
reissued
to
conform
to
that
effluent
standard
or
limitation.

C.
PLACEMENT
OF
SIGNS
Within
sixty
(
60)
days
of
the
effective
date
of
this
permit,
the
permittee
shall
place
and
maintain
a
sign(
s)
at
each
outfall
and
any
bypass/
overflow
point
in
the
collection
system.
For
the
purposes
of
this
requirement,
any
bypass/
overflow
point
that
has
discharged
five
(
5)
or
more
times
in
the
last
year
must
be
so
posted.
The
sign(
s)
should
be
clearly
visible
to
the
public
from
the
bank
and
the
receiving
stream
or
from
the
nearest
public
property/
right­
of­
way,
if
applicable.
The
minimum
sign
size
should
be
two
feet
by
two
feet
(
2'
x
2')
with
one
inch
(
1")
letters.
The
sign
should
be
made
of
durable
material
and
have
a
white
background
with
black
letters.

The
sign(
s)
are
to
provide
notice
to
the
public
as
to
the
nature
of
the
discharge
and,
in
the
case
of
the
permitted
outfalls,
that
the
discharge
is
regulated
by
the
Tennessee
Metro
Nashville
Airport
Authority
(
MNAA)
NPDES
Permit
TN0064041
Page
16
of
40
Department
of
Environment
and
Conservation,
Division
of
Water
Pollution
Control.
The
following
is
given
as
an
example
of
the
minimal
amount
of
information
that
must
be
included
on
the
sign:

TREATED
INDUSTRIAL
WASTEWATER
AND
STORM
WATER
RUNOFF
METRO
NASHVILLE
AIRPORT
AUTHORITY
(
Permittee's
Phone
Number)
NPDES
Permit
NO.
TN0064041
TENNESSEE
DIVISION
OF
WATER
POLLUTION
CONTROL
1­
888­
891­
8332
ENVIRONMENTAL
ASSISTANCE
CENTER
­
NASHVILLE
INDUSTRIAL
WASTEWATER
AND
STORM
WATER
RUNOFF
OVERFLOW
METRO
NASHVILLE
AIRPORT
AUTHORITY
(
Permittee's
Phone
Number)
NPDES
Permit
NO.
TN0064041
TENNESSEE
DIVISION
OF
WATER
POLLUTION
CONTROL
1­
888­
891­
8332
ENVIRONMENTAL
ASSISTANCE
CENTER
­
NASHVILLE
STORM
WATER
RUNOFF
METRO
NASHVILLE
AIRPORT
AUTHORITY
(
Permittee's
Phone
Number)
NPDES
Permit
NO.
TN0064041
TENNESSEE
DIVISION
OF
WATER
POLLUTION
CONTROL
1­
888­
891­
8332
ENVIRONMENTAL
ASSISTANCE
CENTER
­
NASHVILLE
D.
ANTIDEGRADATION
Pursuant
to
the
Rules
of
the
Tennessee
Department
of
Environment
and
Conservation,
Chapter
1200­
4­
3­.
06,
titled
"
Tennessee
Antidegradation
Statement,"
and
in
consideration
of
the
Department's
directive
in
attaining
the
greatest
degree
of
effluent
reduction
achievable
in
municipal,
industrial,
and
other
wastes,
the
permittee
shall
further
be
required,
pursuant
to
the
terms
and
conditions
of
this
permit,
to
comply
with
the
effluent
limitations
and
schedules
of
compliance
required
to
implement
applicable
water
quality
standards,
to
comply
with
a
State
Water
Quality
Plan
or
other
State
or
Federal
laws
or
regulations,
or
where
practicable,
to
comply
with
a
standard
permitting
no
discharge
of
pollutants.

E.
BIOMONITORING
REQUIREMENTS
The
permittee
shall
conduct
a
48­
hour
static
acute
toxicity
test
on
two
test
species
on
the
same
samples
of
final
effluent
from
Outfall
002.
The
test
species
to
be
used
are
Water
Fleas
(
Ceriodaphnia
dubia)
and
Fathead
Minnows
(
Pimephales
promelas).

The
measured
endpoint
for
toxicity
will
be
the
concentration
causing
50%
lethality
(
LC50)
of
the
test
organisms.
The
LC50
shall
be
determined
based
on
a
50%
lethality
as
compared
to
the
controls.
Metro
Nashville
Airport
Authority
(
MNAA)
NPDES
Permit
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40
Test
shall
be
conducted
and
its
results
reported
based
on
appropriate
replicates
of
a
total
of
five
serial
dilutions
and
a
control,
using
the
percent
effluent
dilutions
as
presented
in
the
following
table:

Serial
Dilutions
for
Whole
Effluent
Toxicity
(
WET)
Testing
Permit
Limit
(
PL)
0.50
X
PL
0.25
X
PL
0.125
X
PL
0.0625
X
PL
Control
%
effluent
100
50
25
12.5
6.25
0
The
dilution/
control
water
used
will
be
a
moderately
hard
water
as
described
in
Methods
for
Measuring
the
Acute
Toxicity
of
Effluents
to
Freshwater
and
Marine
Organisms,
EPA/
600/
4­
90/
027F
(
or
the
most
current
edition).
Results
from
an
acute
standard
reference
toxicant
quality
assurance
test
for
each
species
tested
shall
be
submitted
with
the
discharge
monitoring
report.
Reference
toxicant
tests
shall
be
conducted
as
required
in
EPA/
600/
4­
90/
027F
(
or
the
most
current
edition).

Toxicity
will
be
demonstrated
if
the
LC50
is
less
than
or
equal
to
the
permit
limit
indicated
for
each
outfall
in
the
above
table(
s).
Toxicity
demonstrated
by
the
tests
specified
herein
constitutes
a
violation
of
this
permit.

Toxicity
testing
will
be
conducted
using
a
24­
hour
flow­
proportionate
composite
sample
of
final
effluent.
If,
in
any
control
more
than
20%
of
the
test
organisms
die
in
48
hours,
the
test
(
control
and
effluent)
is
considered
invalid
and
the
test
shall
be
repeated
within
30
days
of
the
date
the
initial
test
is
invalidated.
Furthermore,
if
the
results
do
not
meet
the
acceptability
criteria
as
defined
in
Methods
for
Measuring
the
Acute
Toxicity
of
Effluents
to
Freshwater
and
Marine
Organisms,
EPA/
600/
4­
90/
027F,
that
test
shall
be
repeated.
Any
test
initiated
but
terminated
before
completion
must
also
be
reported
along
with
a
complete
explanation
for
the
termination.

The
toxicity
tests
specified
herein
shall
be
conducted
quarterly
(
1/
Quarter
in
each
quarter
during
which
aircraft
deicing
has
occurred)
for
Outfall
001
and
begin
no
later
than
60
days
from
the
effective
date
of
this
permit.
The
toxicity
tests
specified
herein
should
be
started
as
soon
as,
but
not
later
than
1
week
of
receiving
representative
effluent
sample
from
deicing
operation(
s).

In
the
event
of
a
test
failure,
the
permittee
must
start
a
follow­
up
test
within
2
weeks
and
submit
results
from
a
follow­
up
test
within
30
days
from
obtaining
initial
WET
testing
results.
The
follow­
up
test
must
be
conducted
using
the
same
serial
dilutions
as
presented
in
the
corresponding
table(
s)
above.
The
follow­
up
test
will
not
negate
an
initial
failed
test.
In
addition,
the
failure
of
a
follow­
up
test
will
constitute
a
separate
permit
violation
which
must
also
be
reported.

In
the
event
of
2
consecutive
test
failures
or
3
test
failures
within
a
12
month
period
for
the
same
outfall,
the
permittee
must
initiate
a
Toxicity
Identification
Evaluation/
Toxicity
Reduction
Evaluation
(
TIE/
TRE)
study
within
30
days
and
so
notify
the
Division
by
letter.
This
notification
shall
include
a
schedule
of
activities
for
the
initial
investigation
of
that
outfall.
During
the
term
of
the
TIE/
TRE
study,
the
frequency
of
biomonitoring
shall
be
once
every
Metro
Nashville
Airport
Authority
(
MNAA)
NPDES
Permit
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three
months.
Additionally,
the
permittee
shall
submit
progress
reports
once
every
three
months
throughout
the
term
of
the
TIE/
TRE
study.
The
toxicity
must
be
reduced
to
allowable
limits
for
that
outfall
within
2
years
of
initiation
of
the
TIE/
TRE
study.
Subsequent
to
the
results
obtained
from
the
TIE/
TRE
studies,
the
permittee
may
request
an
extension
of
the
TIE/
TRE
study
period
if
necessary
to
conduct
further
analyses.
The
final
determination
of
any
extension
period
will
be
made
at
the
discretion
of
the
Division.

The
TIE/
TRE
study
may
be
terminated
at
any
time
upon
the
completion
and
submission
of
2
consecutive
tests
(
for
the
same
outfall)
demonstrating
compliance.
Following
the
completion
of
TIE/
TRE
study,
the
frequency
of
monitoring
will
return
to
a
regular
schedule,
as
defined
previously
in
this
section
as
well
in
Part
I
of
the
permit.
During
the
course
of
the
TIE/
TRE
study,
the
permittee
will
continue
to
conduct
toxicity
testing
of
the
outfall
being
investigated
at
the
frequency
of
once
every
three
months
but
will
not
be
required
to
perform
follow­
up
tests
for
that
outfall
during
the
period
of
TIE/
TRE
study.

Test
procedures,
quality
assurance
practices
and
determination
of
effluent
lethality
values
will
be
made
in
accordance
with
Methods
for
Measuring
the
Acute
Toxicity
of
Effluents
to
Freshwater
and
Marine
Organisms,
EPA/
600/
4­
90/
027F
or
the
most
current
edition.

Results
of
all
tests,
reference
toxicant
information,
copies
of
raw
data
sheets,
statistical
analysis
and
chemical
analysis
shall
be
compiled
in
a
report.
The
report
shall
be
written
in
accordance
with
Methods
for
Measuring
the
Acute
Toxicity
of
Effluents
to
Freshwater
and
Marine
Organisms,
EPA/
600/
4­
90/
027F
or
the
most
current
edition.

Two
copies
of
biomonitoring
reports
(
including
follow­
up
reports)
shall
be
submitted
to
the
Division.
One
copy
of
the
report
shall
be
submitted
along
with
the
discharge
monitoring
report
(
DMR).
The
second
copy
shall
be
submitted
to
the
local
Division
of
Water
Pollution
Control
office
address:

Environmental
Assistance
Center
­
Nashville
Division
of
Water
Pollution
Control
711
R.
S.
Gass
Boulevard
Nashville,
TN
37243­
1550
PART
IV
__________________________________________________________________________

STORM
WATER
POLLUTION
PREVENTION
PLAN
The
discharger
will
develop,
document
and
maintain
the
SWPPP
pursuant
to
the
requirements
as
set
forth
in
the
Tennessee
Storm
Water
Multi­
Sector
General
Permit
for
Industrial
Activities
(
TMSP),
Sector
S,
"
Storm
water
discharges
from
establishments
and/
or
facilities
including
airports,
air
terminals,
air
carriers,
flying
fields,
and
establishments
engaged
in
servicing
or
maintaining
airports
and/
or
aircraft
(
generally
classified
under
Standard
Industrial
Classification
(
SIC)
code
45)
which
have
vehicle
maintenance
shops,
material
handling
facilities,
equipment
cleaning
operations
or
airport
and/
or
aircraft
deicing/
anti­
icing
Metro
Nashville
Airport
Authority
(
MNAA)
NPDES
Permit
TN0064041
Page
19
of
40
operations,"
Part
3,
"
Storm
Water
Pollution
Prevention
Plan
Requirements."
For
the
details
regarding
plan
requirements,
see
ATTACHMENT
I.
The
plan
shall
be
signed
by
either
a
principal
executive
officer
of
a
corporation,
the
owner
or
proprietor
of
a
sole
proprietorship,
or
a
partner
or
general
partner
of
a
partnership.
The
SWPPP
developed
and
implemented
shall
contain,
in
addition
to
the
requirements
listed
in
the
Tennessee
Multi­
Sector
SWPPP
guidelines
for
establishments
and/
or
facilities
including
airports,
air
terminals,
air
carriers,
flying
fields,
and
establishments
engaged
in
servicing
or
maintaining
airports
and/
or
aircrafts,
the
following
items:

A.
PLAN
IMPLEMENTATION
The
plan
should
be
developed
and
available
for
review
within
180
days
after
permit
coverage.
Facilities
should
implement
the
management
practices
as
soon
as
possible,
but
not
later
than
one
year
after
permit
coverage.
Where
new
construction
is
necessary
to
implement
the
management
plan,
a
construction
schedule
should
be
included.
Construction
should
be
completed
as
soon
as
possible.

B.
PLAN
AVAILABILITY
The
plan
will
be
maintained
by
the
discharger
on
the
site
or
at
a
nearby
office.
Copies
of
the
plan
will
be
submitted
to
the
Division
of
Water
Pollution
Control
within
ten
working
days
of
any
request.

C.
PLAN
MODIFICATION
The
plan
will
be
modified
as
required
by
the
Director
of
the
Division
of
Water
Pollution
Control.

D.
MONITORING
PLAN
The
storm
water
discharges
will
be
monitored
as
required
in
Part
I.
Section
A.,
Effluent
Limits
and
Monitoring
Requirements,
applicable
to
storm
water
outfalls.
For
each
outfall
monitored,
the
surface
area
and
type
of
cover,
for
example,
roof,
pavement,
grassy
areas,
gravel,
will
be
identified.

VMJ
TN0064041.
DOC
Metro
Nashville
Airport
Authority
(
MNAA)
NPDES
Permit
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Page
20
of
40
ATTACHMENT
I
Metro
Nashville
Airport
Authority
NPDES
Permit
TN0064041
Storm
Water
Pollution
Prevention
Plan
Requirements
Metro
Nashville
Airport
Authority
(
MNAA)
NPDES
Permit
TN0064041
Page
21
of
40
Storm
Water
Pollution
Prevention
Plan
Requirements
Storm
water
pollution
prevention
plans
developed
for
areas
of
the
facility
occupied
by
tenants
of
the
airport
shall
be
integrated
with
the
plan
for
the
entire
airport.
For
the
purposes
of
today's
permit,
tenants
of
the
airport
facility
include
airline
companies,
fixed
based
operators
and
other
parties
which
have
contracts
with
the
airport
authority
to
conduct
business
operations
on
airport
property
which
result
in
storm
water
discharges
associated
with
industrial
activity.

a)
Contents
of
Plan.
Each
plan
shall
include,
at
a
minimum,
the
following
items:

(
1)
Pollution
Prevention
Team.
Each
plan
shall
identify
a
specific
individual
or
individuals
as
member(
s)
of
a
storm
water
Pollution
Prevention
Team
who
are
responsible
for
developing
the
storm
water
pollution
prevention
plan
and
assisting
the
facility
management
in
its
implementation,
maintenance,
and
revision.
The
plan
shall
clearly
identify
the
responsibilities
of
each
team
member.
The
activities
and
responsibilities
of
the
team
shall
address
all
aspects
of
the
facility's
storm
water
pollution
prevention
plan.

(
2)
Description
of
Potential
Pollutant
Sources.
Each
plan
shall
provide
a
description
of
potential
sources
which
may
reasonably
be
expected
to
add
significant
amounts
of
pollutants
to
storm
water
discharges
or
which
may
result
in
the
discharge
of
pollutants
during
dry
weather
from
separate
storm
sewers
draining
the
facility.
Each
plan
shall
identify
all
activities
and
significant
materials
which
may
potentially
be
significant
pollutant
sources.
Each
plan
shall
include,
at
a
minimum:

(
a)
Drainage
(
i)
A
site
map
indicating
an
outline
of
the
drainage
area
of
each
storm
water
outfall
within
the
facility
boundaries,
each
existing
structural
control
measure
to
reduce
pollutants
in
storm
water
runoff,
surface
water
bodies,
locations
where
significant
materials
are
exposed
to
precipitation,
locations
where
major
spills
or
leaks
identified
under
paragraph
3.
a.(
2)(
c)
(
Spills
and
Leaks)
of
this
section
have
occurred,
and
the
locations
of
the
following
activities
where
such
activities
are
exposed
to
precipitation:
aircraft
and
runway
deicing/
anti­
icing
operations;
fueling
stations;
aircraft,
ground
vehicle
and
equipment
maintenance
and/
or
cleaning
areas;
storage
areas
for
aircraft,
ground
vehicles
and
equipment
awaiting
maintenance;
loading/
unloading
areas;
locations
used
for
the
treatment,
storage
or
disposal
of
wastes,
liquid
storage
tanks,
processing
areas
and
storage
areas.
The
map
must
indicate
the
outfall
locations
and
the
types
of
discharges
contained
in
the
drainage
areas
of
the
outfalls.

(
ii)
For
each
area
of
the
facility
that
generates
storm
water
discharges
associated
with
industrial
activity
with
a
reasonable
potential
for
containing
significant
amounts
of
pollutants,
a
prediction
of
the
direction
of
flow,
and
an
identification
of
the
types
of
pollutants
which
are
likely
to
be
present
in
storm
water
discharges
associated
with
industrial
activity.
Factors
to
consider
include
the
toxicity
of
chemical;
quantity
of
chemicals
used,
produced
or
discharged;
the
likelihood
of
contact
with
storm
water;
and
history
of
significant
leaks
or
spills
of
toxic
or
hazardous
pollutants.
Flows
with
a
significant
potential
for
causing
erosion
shall
be
identified.
Metro
Nashville
Airport
Authority
(
MNAA)
NPDES
Permit
TN0064041
Page
22
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40
(
iii)
The
site
map
developed
for
the
entire
airport
shall
indicate
the
location
of
each
tenant
of
the
facility
that
conducts
industrial
activities
as
described
in
Part
1.
a.,
and
incorporate
information
from
the
tenants
site
map
(
including
a
description
of
industrial
activities,
significant
materials
exposed,
and
existing
management
practices).

(
b)
Inventory
of
Exposed
Materials
 
An
inventory
of
the
types
of
materials
handled
at
the
site
that
potentially
may
be
exposed
to
precipitation.
Such
inventory
shall
include
a
narrative
description
of
significant
materials
that
have
been
handled,
treated,
stored
or
disposed
in
a
manner
to
allow
exposure
to
storm
water
between
the
time
of
3
years
prior
to
the
date
of
issuance
of
this
permit;
method
and
location
of
onsite
storage
or
disposal;
materials
management
practices
employed
to
minimize
contact
of
materials
with
storm
water
runoff
between
the
time
of
3
years
prior
to
the
date
of
issuance
of
this
permit;
the
location
and
a
description
of
existing
structural
and
nonstructural
control
measures
to
reduce
pollutants
in
storm
water
runoff;
and
a
description
of
any
treatment
of
storm
water
runoff.

(
c)
Spills
and
Leaks
 
A
list
of
significant
spills
and
significant
leaks
of
toxic
or
hazardous
pollutants
that
occurred
at
areas
that
are
exposed
to
precipitation
or
that
otherwise
drain
to
a
storm
water
conveyance
at
the
facility
after
the
date
of
3
years
prior
to
the
date
of
issuance
of
this
permit.
Such
list
shall
be
updated
as
appropriate
during
the
term
of
the
permit.

(
d)
Sampling
Data
 
A
summary
of
existing
discharge
sampling
data
describing
pollutants
in
storm
water
discharges
from
the
facility,
including
a
summary
of
sampling
data
collected
during
the
term
of
this
permit.

(
e)
Risk
Identification
and
Summary
of
Potential
Pollutant
Sources
 
A
narrative
description
of
the
potential
pollutant
sources
from
the
following
activities:
aircraft,
runway,
ground
vehicle
and
equipment
maintenance
and
cleaning;
aircraft
and
runway
deicing/
antiicing
operations
(
including
apron
and
centralized
aircraft
deicing/
anti­
icing
stations,
runways,
taxiways
and
ramps);
outdoor
storage
activities;
loading
and
unloading
operations;
and
onsite
waste
disposal.
The
description
shall
specifically
list
any
significant
potential
source
of
pollutants
at
the
facility
and
for
each
potential
source,
any
pollutant
or
pollutant
parameter
[
e.
g.,
biochemical
oxygen
demand
(
BOD5),
oil
and
grease,
etc.]
of
concern
shall
be
identified.

Facilities
which
conduct
deicing/
anti­
icing
operations
shall
maintain
a
record
of
the
types
[
including
the
Material
Safety
Data
Sheets
(
MSDS)]
and
monthly
quantities
of
deicing/
anti­
icing
chemicals
used.
Tenants
and
fixed­
base
operators
who
conduct
deicing/
antiicing
operations
shall
provide
the
above
information
to
the
airport
authority
for
inclusion
in
the
storm
water
pollution
prevention
plan
for
the
entire
facility.

(
3)
Measures
and
Controls.
Operators
covered
by
this
permit
shall
develop
a
description
of
storm
water
management
controls
appropriate
for
their
areas
of
operation,
and
implement
such
controls.
The
priority
in
selecting
controls
shall
reflect
identified
potential
sources
of
pollutants
at
the
facility.
The
description
of
storm
water
management
controls
shall
address
the
following
minimum
components,
including
a
schedule
for
implementing
such
controls:
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(
a)
Good
Housekeeping
 
Good
housekeeping
requires
the
maintenance
of
areas
which
may
contribute
pollutants
to
storm
water
discharges
in
a
clean,
orderly
manner.

(
i)
Aircraft,
Ground
Vehicle
and
Equipment
Maintenance
Areas
 
Permittees
should
ensure
the
maintenance
of
equipment
is
conducted
in
designated
areas
only
and
clearly
identify
these
areas
on
the
ground
and
delineate
them
on
the
site
map.
The
plan
must
describe
measures
that
prevent
or
minimize
the
contamination
of
the
storm
water
runoff
from
all
areas
used
for
aircraft,
ground
vehicle
and
equipment
maintenance
(
including
the
maintenance
conducted
on
the
terminal
apron
and
in
dedicated
hangars).
Management
practices
or
equivalent
measures
such
as
performing
maintenance
activities
indoors,
maintaining
an
organized
inventory
of
materials
used
in
the
maintenance
areas,
draining
all
parts
of
fluids
prior
to
disposal,
preventing
the
practice
of
hosing
down
the
apron
or
hangar
floor,
using
dry
cleanup
methods,
and/
or
collecting
the
storm
water
runoff
from
the
maintenance
area
and
providing
treatment
or
recycling
should
be
considered.

(
ii)
Aircraft,
Ground
Vehicle
and
Equipment
Cleaning
Areas
 
Permittees
should
ensure
that
cleaning
of
equipment
is
conducted
in
designated
areas
only
and
clearly
identify
these
areas
on
the
ground
and
delineate
them
on
the
site
map.
The
plan
must
describe
measures
that
prevent
or
minimize
the
contamination
of
the
storm
water
runoff
from
all
areas
used
for
aircraft,
ground
vehicle
and
equipment
cleaning.
Management
practices
such
as
performing
cleaning
operations
indoors,
and/
or
collecting
the
storm
water
runoff
from
the
cleaning
area
and
providing
treatment
or
recycling
should
be
considered.

(
iii)
Aircraft,
Ground
Vehicle
and
Equipment
Storage
Areas
 
The
storage
of
aircraft,
ground
vehicles
and
equipment
awaiting
maintenance
must
be
confined
to
designated
areas
(
delineated
on
the
site
map).
The
plan
must
describe
measures
that
prevent
or
minimize
the
contamination
of
the
storm
water
runoff
from
these
areas.
Management
practices
such
as
indoor
storage
of
aircraft
and
ground
vehicles,
the
use
of
drip
pans
for
the
collection
of
fluid
leaks,
and
perimeter
drains,
dikes
or
berms
surrounding
storage
areas
should
be
considered.

(
iv)
Material
Storage
Areas
 
Storage
units
of
all
materials
(
e.
g.,
used
oils,
hydraulic
fluids,
spent
solvents,
and
waste
aircraft
fuel)
must
be
maintained
in
good
condition,
so
as
to
prevent
or
minimize
contamination
of
storm
water,
and
plainly
labeled
(
e.
g.,
"
used
oil,"
"
Contaminated
Jet
A,"
etc.).
The
plan
must
describe
measures
that
prevent
or
minimize
contamination
of
the
storm
water
runoff
from
storage
areas.
Management
practices
or
equivalent
measures
such
as
indoor
storage
of
materials,
centralized
storage
areas
for
waste
materials,
and/
or
installation
of
berming
and
diking
around
storage
areas
should
be
considered
for
implementation.

(
v)
Airport
Fuel
System
and
Fueling
Areas
 
The
plan
must
describe
measures
that
prevent
or
minimize
the
discharge
of
fuels
to
the
storm
sewer
resulting
from
fuel
servicing
activities
or
other
operations
conducted
in
support
of
the
airport
fuel
system.
Where
the
discharge
of
fuels
into
the
storm
sewer
cannot
be
prevented,
the
plan
shall
indicate
measures
that
will
be
employed
to
prevent
or
minimize
the
discharge
of
the
contaminated
runoff
into
receiving
surface
waters.
Management
practices
or
equivalent
measures
such
as
implementing
spill
and
overflow
practices
(
e.
g.,
placing
sorptive
materials
beneath
aircraft
during
fueling
operations),
using
dry
cleanup
methods,
and/
or
collecting
the
storm
water
runoff
should
be
considered.
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Nashville
Airport
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(
MNAA)
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(
b)
Preventive
Maintenance
 
A
preventive
maintenance
program
shall
involve
timely
inspection
and
maintenance
of
storm
water
management
devices
(
e.
g.,
cleaning
oil/
water
separators,
removing
debris
from
catch
basins)
as
well
as
inspecting
and
testing
facility
equipment
and
systems
to
uncover
conditions
that
could
cause
breakdowns
or
failures
resulting
in
discharges
of
pollutants
to
surface
waters,
and
ensuring
appropriate
maintenance
of
such
equipment
and
systems.

(
c)
Spill
Prevention
and
Response
Procedures
 
Areas
where
potential
spills
which
can
contribute
pollutants
to
storm
water
discharges
can
occur,
and
their
accompanying
drainage
points
shall
be
identified
clearly
in
the
storm
water
pollution
prevention
plan.
The
plan
shall
describe
material
handling
procedures,
storage
requirements,
and
consider
the
use
of
equipment
such
as
diversion
valves.
Procedures
for
cleaning
up
spills
shall
be
identified
in
the
plan
and
made
available
to
the
appropriate
personnel.
The
necessary
equipment
to
implement
a
clean
up
should
be
available
to
personnel.

(
d)
Source
Reduction
 
Operators
who
conduct
aircraft
and/
or
runway
(
including
taxiways
and
ramps)
deicing/
anti­
icing
operations
shall
evaluate
present
operating
procedures
to
consider
alternative
practices
to
reduce
the
overall
amount
of
deicing/
anti­
icing
chemicals
used
and/
or
lessen
the
environmental
impact
of
the
pollutant
source.

(
i)
With
regard
to
runway
deicing
operations,
operators,
at
a
minimum,
shall
evaluate:
present
application
rates
to
ensure
against
excessive
over
application;
metered
application
of
deicing
chemical;
pre­
wetting
dry
chemical
constituents
prior
to
application;
installation
of
runway
ice
detection
systems;
implementing
anti­
icing
operations
as
a
preventive
measure
against
ice
buildup;
the
use
of
substitute
deicing
compounds
such
as
potassium
acetate
in
lieu
of
ethylene
glycol,
propylene
glycol
and/
or
urea.

(
ii)
In
considering
source
reduction
management
practices
for
aircraft
deicing
operations,
operators,
at
a
minimum,
should
evaluate
current
application
rates
and
practices
to
ensure
against
excessive
over
application,
and
consider
pretreating
aircraft
with
hot
water
prior
to
the
application
of
a
deicing
chemical,
thus
reducing
the
overall
amount
of
chemical
used
per
operation.

Source
reduction
measures
that
the
operator
determines
to
be
reasonable
and
appropriate
shall
be
implemented
and
maintained.
The
plan
shall
provide
a
narrative
explanation
of
the
options
considered
and
the
reasoning
for
whether
or
not
to
implement
them.

(
e)
Management
of
Runoff
 
The
plan
shall
contain
a
narrative
consideration
of
the
appropriateness
of
traditional
storm
water
management
practices
(
practices
other
than
those
which
prevent
or
reduce
source(
s)
of
pollutants)
used
to
divert,
infiltrate,
reuse,
or
otherwise
manage
storm
water
runoff
in
a
manner
that
reduces
pollutants
in
storm
water
discharges
from
the
site.
The
potential
of
various
sources
at
the
facility
to
contribute
pollutants
to
storm
water
discharges
associated
with
industrial
activity
[
see
paragraph
3.
a.(
2)
(
Description
of
Potential
Pollutant
Sources)]
shall
be
considered.
Appropriate
measures
or
equivalent
measures
may
include:
vegetative
swales,
reuse
of
collected
storm
water
(
such
as
for
a
process
or
as
an
irrigation
source),
inlet
controls
(
such
as
oil/
water
separators),
snow
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management
activities,
infiltration
devices,
and
wet
detention/
retention
devices.
Measures
that
the
permittee
determines
to
be
reasonable
and
appropriate
shall
be
implemented
and
maintained.

(
i)
Operators
that
conduct
aircraft
and/
or
runway
deicing/
anti­
icing
operations
shall
also
provide
a
narrative
consideration
of
management
practices
to
control
or
manage
contaminated
runoff
from
areas
where
deicing/
anti­
icing
operations
occur
to
reduce
the
amount
of
pollutants
being
discharged
from
the
site.
Structural
controls
such
as
establishing
a
centralized
aircraft
deicing
facility,
and/
or
collection
of
contaminated
runoff
for
treatment
or
recycling
should
be
considered.
Collection
and
treatment
alternatives
include,
but
are
not
limited
to,
retention
basins,
detention
basins
with
metered
controlled
release,
Underground
Storage
Tanks
(
USTs)
and/
or
disposal
to
Publicly
Owned
Treatment
Works
(
POTW)
by
way
of
sanitary
sewer
or
hauling
tankers.
Runoff
management
controls
that
the
operator
determines
to
be
reasonable
and
appropriate
shall
be
implemented
and
maintained.
The
plan
should
consider
the
recovery
of
deicing/
anti­
icing
materials
when
these
materials
are
applied
during
non­
precipitation
events
to
prevent
these
materials
from
later
becoming
a
source
of
storm
water
contamination.
The
plan
shall
provide
a
narrative
explanation
of
the
controls
selected
and
the
reasons
for
their
selection.

(
f)
Inspections
 
In
addition
to
or
as
part
of
the
comprehensive
site
evaluation
required
under
paragraph
3.
a.(
4)
of
this
section,
qualified
facility
personnel
shall
be
identified
to
inspect
designated
equipment
and
areas
of
the
facility
specified
in
the
plan.
The
inspection
frequency
shall
be
specified
in
the
plan,
but
at
a
minimum
be
conducted
once
per
week
during
deicing/
anti­
icing
application
periods
for
areas
where
deicing/
anti­
icing
operations
are
being
conducted.
A
set
of
tracking
or
follow­
up
procedures
shall
be
used
to
ensure
that
appropriate
actions
are
taken
in
response
to
the
inspections.
Records
of
inspections
shall
be
maintained.
The
use
of
a
checklist
developed
by
the
pollution
prevention
team
is
encouraged.

(
g)
Pollution
Prevention
Training
 
Pollution
prevention
training
programs
shall
be
developed
to
inform
management
and
personnel
responsible
for
implementing
activities
identified
in
the
storm
water
pollution
prevention
plan
of
the
components
and
goals
of
the
plan.
Training
should
address
topics
such
as
spill
response,
good
housekeeping,
aircraft
and
runway
deicing/
anti­
icing
procedures,
and
material
management
practices.
The
pollution
prevention
plan
shall
identify
periodic
dates
for
such
training.

(
h)
Recordkeeping
and
Internal
Reporting
Procedures
 
A
description
of
incidents
(
such
as
spills,
or
other
discharges),
along
with
other
information
describing
the
quality
and
quantity
of
storm
water
discharges
shall
be
included
in
the
plan.
Inspections
and
maintenance
activities
shall
be
documented
and
records
shall
be
incorporated
into
the
plan.

(
i)
Non­
storm
Water
Discharges
(
i)
The
plan
shall
include
a
certification
that
the
discharge
points
have
been
tested
or
evaluated
for
the
presence
of
non­
storm
water
discharges.
The
certification
shall
include
the
identification
of
potential
significant
sources
of
non­
storm
water
at
the
site,
a
description
of
the
results
of
any
test
and/
or
evaluation
for
the
presence
of
non­
storm
water
discharges,
the
evaluation
criteria
or
testing
method
used,
the
date
of
any
testing
and/
or
evaluation,
and
the
onsite
drainage
points
that
were
directly
observed
during
the
test.
Certifications
shall
be
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MNAA)
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signed
in
accordance
with
Part
I.
D.
1.
of
this
permit.
Such
certification
may
not
be
feasible
if
the
facility
operating
the
storm
water
discharge
associated
with
industrial
activity
does
not
have
access
to
an
outfall,
manhole,
or
other
point
of
access
to
the
ultimate
conduit
which
receives
the
discharge.
In
such
cases,
the
source
identification
section
of
the
storm
water
pollution
prevention
plan
shall
indicate
why
the
certification
required
by
this
part
was
not
feasible,
along
with
the
identification
of
potential
significant
sources
of
non­
storm
water
at
the
site.
A
discharger
that
is
unable
to
provide
the
certification
required
by
this
paragraph
must
notify
the
Division
of
Water
Pollution
Control
in
accordance
with
paragraph
3.
a.(
3)(
iii)
(
below).

(
ii)
Sources
of
non­
storm
water
that
are
combined
with
storm
water
discharges
associated
with
industrial
activity
must
be
identified
in
the
plan.
The
plan
shall
identify
and
ensure
the
implementation
of
appropriate
pollution
prevention
measures
for
the
non­
storm
water
component(
s)
of
the
discharge.
Any
non­
storm
water
discharges
that
are
not
permitted
under
an
individual
NPDES
permit
should
be
brought
to
the
attention
of
the
Division's
local
Field
Office
(
see
APPENDIX
I).

(
iii)
Failure
to
Certify
 
Any
facility
that
is
unable
to
provide
the
certification
required
(
testing
for
non­
storm
water
discharges),
must
notify
the
Division
of
Water
Pollution
Control
180
days
after
the
date
of
issuance
of
this
permit.
If
the
failure
to
certify
is
caused
by
the
inability
to
perform
adequate
tests
or
evaluations,
such
notification
shall
describe:
the
procedure
of
any
test
conducted
for
the
presence
of
non­
storm
water
discharges;
the
results
of
such
test
or
other
relevant
observations;
potential
sources
of
non­
storm
water
discharges
to
the
storm
sewer;
and
why
adequate
tests
for
such
storm
sewers
were
not
feasible.
Non­
storm
water
discharges
to
waters
of
the
State
which
are
not
authorized
by
an
NPDES
permit
are
unlawful,
and
must
be
terminated.

(
j)
Sediment
and
Erosion
Control
 
The
plan
shall
identify
areas
which,
due
to
topography,
activities,
or
other
factors,
have
a
high
potential
for
significant
soil
erosion,
and
identify
structural,
vegetative,
and/
or
stabilization
measures
to
be
used
to
limit
erosion.

(
4)
Comprehensive
Site
Compliance
Evaluation.
Qualified
personnel
shall
conduct
site
compliance
evaluations
during
periods
of
deicing/
anti­
icing
operations
at
appropriate
intervals
specified
in
the
plan,
but
in
no
case
less
than
once
a
year.
Such
evaluations
shall
provide:

(
a)
Areas
contributing
to
a
storm
water
discharge
associated
with
industrial
activity
shall
be
visually
inspected
for
evidence
of,
or
the
potential
for,
pollutants
entering
the
drainage
system.
Measures
to
reduce
pollutant
loadings
shall
be
evaluated
to
determine
whether
they
are
adequate
and
properly
implemented
in
accordance
with
the
terms
of
the
permit
or
whether
additional
control
measures
are
needed.
Structural
storm
water
management
measures,
sediment
and
erosion
control
measures,
and
other
structural
pollution
prevention
measures
identified
in
the
plan
shall
be
observed
to
ensure
that
they
are
operating
correctly.
A
visual
inspection
of
equipment
needed
to
implement
the
plan,
such
as
spill
response
equipment,
shall
be
made.

(
b)
Based
on
the
results
of
the
evaluation,
the
description
of
potential
pollutant
sources
identified
in
the
plan
in
accordance
with
paragraph
3.
a.(
2)
of
this
section
(
Description
of
Potential
Pollutant
Sources)
and
pollution
prevention
measures
and
controls
identified
in
the
Metro
Nashville
Airport
Authority
(
MNAA)
NPDES
Permit
TN0064041
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40
plan
in
accordance
with
paragraph
3.
a.(
3)
of
this
section
(
Measures
and
Controls)
shall
be
revised
as
appropriate
within
2
weeks
of
such
evaluation
and
shall
provide
for
implementation
of
any
changes
to
the
plan
in
a
timely
manner,
but
in
no
case
more
than
12
weeks
after
the
evaluation.

(
c)
A
report
summarizing
the
scope
of
the
evaluation,
personnel
making
the
evaluation,
the
date(
s)
of
the
evaluation,
major
observations
relating
to
the
implementation
of
the
storm
water
pollution
prevention
plan,
and
actions
taken
in
accordance
with
paragraph
3.
a.(
4)(
b)
(
above)
of
the
permit
shall
be
made
and
retained
as
part
of
the
storm
water
pollution
prevention
plan
for
at
least
3
years
from
the
date
of
the
evaluation.
The
report
shall
identify
any
incidents
of
noncompliance.
Where
a
report
does
not
identify
any
incidents
of
noncompliance,
the
report
shall
contain
a
certification
that
the
facility
is
in
compliance
with
the
storm
water
pollution
prevention
plan
and
this
permit.
The
report
shall
be
signed
in
accordance
with
Part
I.
D.
1.
of
this
permit.

(
d)
Where
compliance
evaluation
schedules
overlap
with
inspections
required
under
3.
a.(
3)(
f),
the
compliance
evaluation
may
be
conducted
in
place
of
one
such
inspection.
Metro
Nashville
Airport
Authority
(
MNAA)
NPDES
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ADDENDUM
I
WASTELOAD
ALLOCATION
STUDY
WORKPLAN
FOR
SIMS
BRANCH
METROPOLITAN
NASHVILLE
AIRPORT
AUTHORITY
One
Terminal
Drive,
Suite
501
Nashville,
Tennessee
November
2001
Metro
Nashville
Airport
Authority
(
MNAA)
NPDES
Permit
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of
40
Metro
Nashville
Airport
Authority
(
MNAA)
NPDES
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30
of
40
1.0
INTRODUCTION
1.1
Background
The
Metropolitan
Nashville
Airport
Authority
(
MNAA)
owns
and
operates
the
Nashville
International
Airport
(
BNA),
which
is
located
within
Davidson
County
as
illustrated
in
Figure
1­
1.
The
approximate
geographical
coordinates
of
the
airport
are
36
°
08'
2"
N
Latitude
86
°
40'
24"
W
Longitude.
BNA
is
a
medium­
sized,
primarily
commercial,
airport
that
accommodates
domestic
and
international
passenger
flights,
commuter
traffic,
freight
and
courier
transports,
general
aviation,
and
military
flights.

Storm
water
runoff
from
BNA
discharges
to
Mill
Creek,
Sims
Branch,
and
McCrory
Creek
from
ten
(
10)
identified
storm
water
outfalls.
The
majority
of
the
airport
that
is
actively
engaged
in
industrial
activities
(
deicing,
fueling,
washing,
etc)
drains
through
one
of
four
underground
oil/
water
separators
to
a
storm
pond,
and
then
to
the
airport
storm
water
treatment
basin.
Following
treatment,
storm
water
is
currently
discharged
to
Sims
Branch
under
the
authority
of
the
expired
NPDES
Permit
No.
TN0064041
(
MODIFIED).

The
Tennessee
Department
of
Environment
and
Conservation,
Division
of
Water
Pollution
Control
(
TDEC
WPC)
is
working
on
renewing
the
expired
NPDES
Permit
and
has
issued
the
MNAA
a
Draft
NPDES
Permit
No.
TN0064041.
The
Draft
permit
contains
proposed
effluent
discharge
limitations
on
5­
day
Biochemical
Oxygen
Demand
(
BOD5)
as
well
as
other
conventional
parameters.
BOD5
is
a
measure
of
pollution
present
in
runoff
from
the
airport,
and
results
primarily
from
de­
icing
and
anti­
icing
fluids.

In
the
years
leading
up
to
the
issuance
of
the
current
Draft
permit,
MNAA
consultants
have
conducted
several
intensive
field
studies
and
developed
models
of
the
receiving
stream
in
order
to
suggest
appropriate
BOD5
limits
to
TDEC
WPC.
Unfortunately,
the
quality
and
type
of
data
gathered,
and
consequently
the
modeling
and
proposed
limits,
was
not
deemed
acceptable
by
TDEC
WPC
and
have
essentially
been
disregarded.
Instead,
the
BOD5
limits
proposed
in
the
Draft
NPDES
permit
were
developed
by
TDEC
WPC
based
on
desktop
modeling
of
the
receiving
stream
with
little
corroborative
field
data.

1.2
Purpose
Based
on
the
method
used
to
model
the
receiving
stream
and
discharge,
the
model
is
likely
conservative
in
nature
and
has
resulted
in
overly
stringent
BOD5
effluent
limitations
for
the
MNAA.
In
other
words,
to
be
protective
of
the
receiving
stream,
and
in
the
absence
of
appropriate
field
data,
TDEC
WPC
has
used
standard,
conservative
default
model
parameters
in
their
model.
If
unable
to
remove
sufficient
BOD5
from
the
wastewater
in
the
BNA
treatment
basin,
the
MNAA
would
be
at
risk
of
violating
discharge
permit
limits
or
be
forced
to
divert
the
discharge
to
the
Nashville
sanitary
sewer
system
and
pay
surcharges.
A
properly
conducted
WLA
and
modeling
study
would
generate
a
more
accurate
model
of
the
receiving
stream
and
Metro
Nashville
Airport
Authority
(
MNAA)
NPDES
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Figure
1­
1
Metro
Nashville
Airport
Authority
(
MNAA)
NPDES
Permit
TN0064041
Page
32
of
40
could
yield
greater
effluent
BOD5
limitations
for
the
MNAA
and
still
be
protective
of
the
receiving
stream.

With
the
concurrence
of
TDEC
WPC,
the
MNAA
will
initiate
a
wasteload
allocation
and
modeling
study
of
Sims
Branch
in
order
to
develop
alternate
effluent
water
quality
limitations
for
the
BNA
storm
water
treatment
pond
discharge.
The
purpose
of
this
document
is
to
describe
the
elements
of
such
a
proposed
study.

1.3
Scope
of
Work
The
specific
tasks
comprising
the
wasteload
allocation
study
are
listed
below.
The
tasks
are
expounded
upon
in
subsequent
sections.

1.
Develop
approved
study
work
plan.

2.
Reconnaissance
field
survey
of
receiving
stream.

3.
Time­
of­
travel
field
studies.

4.
Develop
and
calibrate
water
quality
model.

5.
Conduct
continuous
monitoring.

6.
Validate
model.

7.
Wasteload
allocation
modeling.

8.
Final
report
submittal.
Metro
Nashville
Airport
Authority
(
MNAA)
NPDES
Permit
TN0064041
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of
40
2.0
WASTELOAD
ALLOCATION
STUDY
2.1
Work
Plan
This
document
constitutes
the
Work
Plan
covering
all
components
of
a
study
to
develop
an
assimilative
capacity
model
of
Sims
Branch.
The
model
will
be
used
to
develop
discharge
limits
which
are
both
equitable
for
the
MNAA
and
protective
of
the
receiving
stream.
It
is
the
intention
of
the
MNAA
to
submit
this
Work
Plan
to
TDEC
WPC
for
review
and
approval.

2.2
Reconnaissance
Field
Survey
The
first
step
in
developing
an
accurate
water
quality
model
of
Sims
Branch
is
to
conduct
physical
reconnaissance
of
the
stream.
There
are
several
objectives
of
the
reconnaissance
survey,
including
establishment
of
an
accurate
system
diagram/
map,
as
well
as
assessment
of
watershed
conditions,
land
uses,
and
physical
attributes
of
the
stream.
Due
to
the
relatively
short
length
of
the
receiving
stream,
and
in
order
to
ensure
that
model
encompasses
the
full
dissolved
oxygen
sag
curve,
the
entire
length
of
the
stream
will
be
reconnoitered.

Sims
Branch
will
be
walked
from
accessible
headwater
segments
on
the
Airport
property
to
the
confluence
with
Mill
Creek.
Observations
regarding
stream
conditions,
habitat,
and
surrounding
land
uses
along
the
extent
of
the
stream
will
be
documented
with
photographs
and
field
notebooks.
Detailed
measurements
of
channel
morphology
(
width
and
depth)
will
be
made
approximately
every
1,000
yards
along
the
length
of
the
stream,
or
as
conditions
warrant
(
e.
g.,
obvious
change
in
hydrologic
characteristics).

Field
measurements
will
include
determination
of
flow.
The
instantaneous
flow
will
be
determined
by
accurately
measuring
the
cross
section
of
the
stream
and
then
measuring
in
stream
velocity
using
a
rod­
mounted
Pygmy
current
meter
(
vertical
shaft,
rotating
cup
meter).
All
data
will
be
recorded
on
standardized
field
forms
and/
or
stored
in
a
handheld
data­
logging
device.
The
velocity
measurements
will
be
used
to
estimate
time
of
travel
and
to
provide
definition
for
the
next
task
in
the
study.

Several
stations
will
be
marked
on
the
stream
bank.
The
stations
will
be
used
as
points
of
reference
so
that
exact
locations
and
distances
can
be
determined
during
all
subsequent
in
stream
monitoring
surveys
and
time­
of­
travel
studies.

In
situ
water
quality
characteristics
(
temperature,
conductivity,
and
pH),
including
an
initial
synoptic
DO
profile,
will
also
be
measured
during
the
reconnaissance
survey.
Additional
in
situ
measurements
which
may
be
collected
include
secchi
disk
measurements
for
the
determination
of
the
amount
of
light
penetration
into
the
water.

The
reconnaissance
survey
will
be
scheduled
upon
approval
of
this
work
plan
by
TDEC,
but
it
is
anticipated
to
occur
sometime
during
late
November/
early
December
of
2001.
Prior
to
conducting
the
survey,
accessible
portions
of
the
stream
may
be
observed
from
vehicles
in
order
to
help
plan
the
survey.
Metro
Nashville
Airport
Authority
(
MNAA)
NPDES
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2.3
Time­
of­
travel
Surveys
Background
Time­
of­
travel
surveys
will
be
used
to
gather
data
for
model
calibration.
When
evaluating
treated
wastewater
runoff
quality
from
Airport
operations
there
are
two
distinct
scenarios
which
must
be
considered:
1)
discharge
during
deicing
season;
and
2)
discharge
during
the
summer
season.
Both
or
either
scenario
may
represent
critical
periods
from
a
wasteload
allocation
perspective.
First,
the
greatest
pollutant
loading
contribution
from
Airport
operations
is
expected
during
the
winter
since
deicing
and
antiicing
operations
are
more
likely
to
occur.
As
discussed
previously,
deicing
chemicals
(
i.
e.,
glycols)
are
the
main
source
of
BOD
at
the
Airport.
However,
during
the
summer
months
background
flow
and
temperature
conditions
in
the
receiving
stream
are
expected
to
produce
critical
water
quality
conditions,
and
hence
these
summer
conditions
are
normally
used
to
represent
the
"
worst­
case"
discharge
scenario
and
must
be
taken
into
account.
In
consideration
of
these
two
critical
scenarios,
two
campaigns
of
time­
of­
travel
studies
are
proposed:
once
during
deicing
season
and
once
during
summer.

Hydraulic
parameters,
water
quality
conditions,
and
kinetic
reaction
rates
will
be
determined
from
data
gathered
during
these
studies.
Flow
and
time­
of­
travel
measurements
are
critical
in
the
wasteload
allocation
process
for
determination
of
decay
rates
(
time
dependent)
required
by
the
model
and
for
establishment
of
the
required
hydraulic
boundary
conditions.
Although
the
methodologies
for
these
measurements
are
described
separately,
the
time­
of­
travel,
flow
measurements,
in
situ
water
quality
and
samples
for
laboratory
analyses
will
be
taken
concurrently
during
these
intensive
surveys.

The
distance
from
the
point
of
discharge
from
the
Airport
wastewater
treatment
pond
to
Mill
Creek
is
approximately
2.5
miles
(
according
to
USGS
quadrangle
map).
Although
the
reconnaissance
survey
and
the
calibration
studies
will
accurately
delineate
the
time­
of­
travel
and
the
D.
O.
sag
curve
in
Sims
Branch,
it
is
anticipated
that
the
sag
point
under
all
conditions
will
manifest
itself
prior
to
Mill
Creek.
If
there
is
no
sag
point
in
Sims
Branch
prior
to
Mill
Creek,
the
combined
flow
and
additional
dissolved
oxygen
mass
contribution
of
Mill
Creek
is
expected
to
completely
mitigate
the
potential
impact
of
the
Airport
discharge,
although
this
scenario
will
also
be
addressed
in
the
final
report
if
applicable.
Assuming
a
total
travel
time
of
less
than
two
days,
the
calibration
studies
have
initially
been
planned
for
two
days
each
(
48
hours),
although
this
may
be
modified
based
on
information
gathered
during
the
reconnaissance
survey
or
first
calibration
study.

Note
that
due
to
the
temperate
climate
in
Nashville,
only
moderate
amounts
of
deicing
fluid
are
applied
to
aircraft.
If
the
winter
is
milder
than
usual,
there
may
not
be
much
deicing
fluid
applied
at
all.
It
is
also
quite
possible
that
if
deicing
fluid
is
applied
to
aircraft
at
the
terminal
gates
or
deicing
pad
during
periods
of
little
precipitation,
the
deicing
fluid
may
take
several
days
to
reach
the
treatment
basin
if
at
all.
In
other
words,
depending
on
conditions
there
may
not
be
any
BOD
load
to
be
discharged
to
Sims
Branch
during
the
scheduled
studies.
In
order
to
permit
scheduling
of
the
studies
and
to
provide
the
best
possible
data
for
the
modeling
study,
if
there
is
insufficient
BOD
available
for
discharge
it
is
proposed
that
the
treatment
basin
be
spiked
with
a
quantity
of
propylene
glycol
to
generate
a
measurable
BOD
load.
Although
spiked
effluent
will
not
be
exactly
representative
of
processed
waste
(
treated
pond
BOD
may
Metro
Nashville
Airport
Authority
(
MNAA)
NPDES
Permit
TN0064041
Page
35
of
40
be
more
recalcitrant
because
it
has
been
treated),
the
dynamics
of
the
receiving
stream
should
be
similar.
The
spiked
BOD
concentration
will
be
25
mg/
L
or
less,
and
will
be
controlled
by
careful
analysis
and
dilution
at
the
discharge.

Dye
Time­
of­
Travel
Flow
will
be
gauged
at
least
twice
per
day
in
Sims
Branch
near
the
dye
mass
during
each
study.
In
addition,
the
Sims
Branch
flow
upstream
from
the
Airport
treatment
pond
discharge
will
be
measured
prior
to
injection
of
the
dye.
The
stream
flow
will
be
determined
from
velocity
and
depth
measurements
using
a
Pygmy
current
meter
on
a
wading
rod
in
accordance
with
standard
USGS
standard
gauging
techniques.
If
there
are
significant
tributaries
contributing
to
stream
flow,
these
will
also
be
estimated.
Normally,
1%
of
main
stream
flow
is
used
as
a
criterion
for
defining
tributaries
as
"
significant."

Time
of
water
travel
for
Sims
Branch
will
be
determined
from
both
dye
peak­
to­
peak
travel
time
measured
at
2
to
6
hour
intervals
over
approximately
a
2­
day
period
and
from
selected
locations
where
ISCO
samplers
will
be
positioned
to
collect
the
complete
dye
curve
at
up
to
3
stationary
points
in
the
study
area.
On
the
first
day
of
each
calibration
field
study,
a
sufficient
quantity
of
20%
Rhodamine
WT,
a
fluorescent
water
tracing
dye,
will
be
instantaneously
injected
into
Sims
Branch
upstream
from
the
Airport
discharge
point
to
achieve
a
downstream
concentration
of
20
ppb
or
less.
At
this
concentration,
the
dye
should
not
be
visible
to
the
naked
eye,
but
easily
detectable
by
a
fluorometer.
Following
injection,
the
dye
peak
will
be
measured
about
every
2
to
6
hours
using
a
Turner
Designs
Model
10­
AU
or
SCUFA
Fluorometer
with
sensitivities
of
approximately
0.01
ppb
and
0.04
ppb,
respectively.

Sims
Branch
water
from
about
mid
depth
will
be
analyzed
at
known
fixed
stations
established
during
the
reconnaissance
study.
Once
fluorometer
readings
exceed
background
levels
(
indicating
the
presence
of
the
dye
plume),
measurements
will
be
recorded
at
intervals
ranging
from
approximately
2
to
15
minutes.
Readings
will
continue
until
the
peak
is
reached
and
dye
readings
recede
to
approximately
10
percent
of
the
peak
concentration.
After
the
dye
peak
has
passed
a
station,
the
equipment
and
personnel
will
move
to
the
next
downstream
station
to
await
the
dye
peak
again
in
a
similar
manner.

In
addition,
ISCO
samplers
will
be
stationed
at
2
to
3
locations
along
the
study
area
to
measure
average
dye
mass
time
of
travel.
Discrete
samples
will
be
taken
at
approximately
15
to
30
minute
intervals
over
a
4
to
8
hour
period
in
order
to
delineate
the
dye
curve.
These
data
will
then
be
used
to
determine
the
dye
mass
center
which
is
analogous
to
the
average
time
of
travel.
The
stations
will
be
located
near
the
beginning
of
the
dye
study,
the
approximate
midpoint
and
near
the
end
of
the
dye
study
area.
The
peak
to
peak
dye
measurements
will
then
be
interpolated
using
these
three
points
back
to
an
average
dye
time
of
travel
at
each
water
quality
station.

Time
of
travel
data
will
be
used
with
the
flow
data
to
develop
v=
aQ
b
relationships
for
each
Sims
Branch
reach.
The
coefficient,
a,
and
the
exponent
b,
developed
for
each
reach
will
be
input
into
the
QUAL2E
model.

Distances
will
be
determined
based
on
miles
as
measured
on
the
current
7.5
minute
USGS
quadrangle
maps.
The
velocity
of
the
River
within
the
study
area
is
believed
to
be
on
the
order
of
0.05
to
0.5
feet
per
second,
dependent
on
flow
conditions.
Therefore,
the
dye
mass
will
be
Metro
Nashville
Airport
Authority
(
MNAA)
NPDES
Permit
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40
tracked
for
approximately
24
to
48
hours
of
travel
or
about
13,000
ft.
Results
from
the
bathymetric
profiles,
dye
time­
of­
travel,
and
concurrent
flow
measurements
will
provide
the
hydraulic
characterization
necessary
for
determining
velocity
versus
flow
and
depth
versus
flow
relationships.
The
velocity
versus
flow
relationships
developed
for
each
reach
will
be
used
in
the
wasteload
allocation
modeling.

Water
Quality
At
each
dye
station,
in
situ
water
quality
measurements
and
composite
water
samples
for
timeseries
BOD
and
chemical
analyses
will
be
collected
around
the
dye
peak.
In
situ
measurements
and
water
samples
will
be
collected
for
laboratory
analysis
at
the
approximate
center
of
the
stream
from
about
mid­
depth
at
about
2
to
15
minute
intervals
around
the
dye
peak.
If
a
different
sampling
strategy
(
e.
g.,
widely
dispersed
and
separate
flow
paths)
is
suggested
by
the
reconnaissance
study,
the
sampling
strategy
will
be
adjusted
for
the
dye
studies.

In
situ
water
quality
parameters
will
be
collected
concurrently
with
the
dye
time
of
travel
study
and
include
D.
O.,
temperature,
conductivity,
and
pH.
Measurements
of
these
parameters
will
be
recorded
at
each
dye
station.
Instruments
to
be
utilized
for
these
measurements
include
a
Hydrolab
Data
Sonde
3
Multiprobe
Logger
(
Model
D3S­
BS
with
Hydrolab
Surveyor
3
Display
Logger,
Model
SVR3­
DL)
or
equivalent
instrumentation.
Several
measurements
will
be
made
around
the
dye
peak
at
each
station.
These
measurements
will
be
from
the
center
of
the
channel
at
about
mid­
depth
in
the
water
column.
Again,
if
reconnaissance
data
indicate
a
different
sampling
scheme
is
required,
then
the
dye
study
sampling
scheme
will
be
modified
accordingly.
In
situ
water
quality
will
also
be
measured
from
any
significant
tributary
to
Sims
Branch.

Instruments
will
be
calibrated
at
the
beginning
of
each
study
and
at
approximately
8
to
10
hour
intervals
during
the
field
survey.
The
D.
O.
meters
will
be
air
calibrated
following
instrument
manufacturer's
recommendations.
The
pH
meters
will
be
calibrated
using
pH
7.0
and
pH
10.0
standard
buffers.
The
conductivity
meters
will
be
calibrated
using
prepared
potassium
chloride
standards
of
718
and
1,413
µ

/
cm.

Time­
Series
BOD
Time­
Series
BOD
samples
will
be
prepared
from
river
composite
samples
collected
with
the
dye
time­
of­
travel
study.
As
previously
mentioned,
a
composite
river
sample
will
be
collected
at
each
dye
time­
of­
travel
station
by
collecting
a
series
of
subsamples
around
the
dye
peak
to
create
a
5­
gallon
composite
sample
at
the
station.
Stream
samples
will
be
immediately
covered
and
stored
to
minimize
temperature
extremes
and
potential
temperature
shock
until
the
samples
can
be
transported
to
the
Airport
laboratory.
Samples
will
be
transported
to
the
laboratory
for
preparation
of
duplicate
2­
L
BOD
bottles
plus
a
1­
gallon
makeup
sample
container.
After
initial
D.
O.
readings,
the
BOD
bottles
will
be
incubated
in
coolers
at
20
°
C.
Samples
will
also
be
prepared
for
any
other
significant
tributaries
within
the
study
area.
In
addition,
time­
series
BOD
samples
will
be
prepared
for
the
background
Sims
Branch
sample
(
upstream
from
the
Airport
treatment
basin
discharge).

Once
the
water
samples
are
brought
to
the
laboratory,
the
samples
will
be
vigorously
shaken
to
aerate
the
samples
to
saturation.
The
sample
will
be
allowed
to
stabilize
for
about
5
minutes.
The
sample
will
then
be
carefully
siphoned
into
two
2­
L
BOD
bottles
and
a
1­
gallon
Metro
Nashville
Airport
Authority
(
MNAA)
NPDES
Permit
TN0064041
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of
40
amber
bottle.
The
two
2­
L
BOD
bottles
will
serve
as
duplicate
samples
for
measurement
of
oxygen
utilization
during
the
90­
day
incubation
period.
The
1­
gallon
amber
bottle
will
provide
the
additional
sample
required
to
makeup
volume
lost
during
the
periodic
D.
O.
readings.
A
5­
mL
disposable
pipette
will
be
used
to
transfer
makeup
water
from
the
bottle
to
each
of
the
2­
L
duplicate
bottles.
Additionally,
the
TKN
and/
or
(
NO2+
NO3)­
N
samples
will
be
obtained
from
the
makeup
bottle
during
the
incubation
period.
After
initial
(
t0
or
"
time
zero")
readings
are
taken
from
the
two
duplicate
samples
and
the
lost
volume
is
carefully
replaced
in
the
sample
(
preventing
oxygen
transmittal),
both
samples
will
be
sealed
with
air­
tight
caps
to
prevent
D.
O.
exchange.
In
addition,
all
samples
will
be
covered
with
opaque
material
to
prevent
light
penetration
and
potential
algal
productivity.

The
D.
O.
will
be
monitored
in
the
samples
at
frequent
intervals
including
days
0,
0.5,
1,
2,
3,
4,
5,
7,
10,
15,
20,
25,
30,
35,
45,
60,
75
and
90.
In
addition,
TKN
and/
or
(
NO2+
NO3)­
N
samples
will
be
withdrawn
for
analysis
of
nitrogenous
activity
on
days
0
and
90.

Results
from
the
90­
day
time
series
BOD
samples
represent
the
ultimate
carbonaceous
and
nitrogenous
BOD.
Since
the
5­
day
BOD
is
required
for
permit
limits
and
for
MNAA's
examination
of
their
effluent
quality,
results
from
the
long­
term
ultimate
BOD
of
90
days
will
be
converted
to
the
appropriate
5­
day
value.
A
CBODu
to
BOD5
ratio
will
be
estimated
for
this
effluent
and
used
in
the
QUAL2E
model.

Water
Samples
for
Chemical
Analyses
Water
samples
for
chemical
analyses
will
be
collected
from
the
5­
gallon
composite
time­
series
BOD
samples
collected
at
each
dye
station.
The
samples
will
be
analyzed
for
the
following:

 
Total
Kjeldahl
Nitrogen
(
TKN);
 
Ammonia
Nitrogen
(
NH3­
N);
 
Nitrite
+
Nitrate
nitrogen
(
NO2+
NO3­
N);
 
Dissolved
Orthophosphate
(
Dissolved
Ortho­
P);
 
Total
Phosphate
(
total
PO4);
and
 
Chlorophyll
a.

Organic
nitrogen
is
determined
from
the
difference
between
TKN
and
NH3­
N
and
total
organic
phosphorus
is
determined
from
the
difference
between
total
phosphates
and
orthophosphates.
These
samples
will
be
prepared
from
composite
water
quality
samples
collected
with
the
dye
time­
of­
travel
study.
The
same
5­
gallon
composite
sample
collected
for
the
BOD
sample
will
be
used
to
fill
the
individual
sample
bottles
for
chemical
analyses.
Samples
for
chemical
analyses
will
also
be
prepared
from
samples
of
the
Sims
Branch
background
and
effluent.
Grab
samples
for
chemical
analyses
will
be
obtained
for
any
other
significant
tributaries
in
the
study
area.

Diurnal
D.
O.
Swing
D.
O.
concentrations
will
be
measured
at
specific
stations
over
the
diurnal
cycle
to
estimate
the
influence
of
algal
productivity
and
respiration
on
stream
D.
O.
levels,
as
well
as
evaluate
the
target
D.
O.
of
5
mg/
L
required
for
the
wasteload
allocation
modeling.
For
each
calibration
study,
D.
O.
and
temperature
measurements
will
be
recorded
at
approximately
2
to
3
stations
Metro
Nashville
Airport
Authority
(
MNAA)
NPDES
Permit
TN0064041
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38
of
40
on
a
continuous
basis.
Diurnal
D.
O.
measurements
will
be
obtained
during
each
dye
survey
period.
Periodic
checks
of
stream
D.
O.
will
be
made
independently
at
these
fixed
stations.

2.4
Calibrate
Water
Quality
Model
Water
Quality
Modeling
Wasteload
allocation
modeling
will
be
conducted
using
the
USEPA
wasteload
allocation
model
QUAL2E.
The
QUAL2E
model
is
widely
used
and
accepted
by
both
state
and
federal
regulatory
agencies
and
is
acceptable
to
TDEC
and
USEPA
Region
4.
The
model
was
developed
for
use
as
a
water
quality
planning
tool
to
set
permit
limits
for
point
source
dischargers
of
conventional
constituents
such
as
CBODu,
organic
nitrogen,
and
ammonia
nitrogen,
as
well
as
to
assist
in
determining
the
levels
of
treatment
required
for
a
constituent
mass
load.
QUAL2E
solves
a
one­
dimensional
advection­
dispersion
mass
transport
equation
using
the
classic
implicit
backward
difference
numerical
solution
technique.
Components
of
the
general
equation
include
dispersion,
advection,
constituent
reactions,
constituent
interactions,
and
other
sources
and
sinks.

The
primary
constituent
being
modeled
is
D.
O.
and
therefore
the
model
is
driven
by
the
factors
which
impact
in
stream
levels
of
D.
O.
Some
of
these
factors
include
the
deoxygenation
of
ultimate
carbonaceous
biochemical
oxygen
demand
(
CBODu),
organic­
nitrogen
conversion
to
ammonia,
nitrification
of
ammonia,
SOD,
reaeration,
temperature,
flow,
and
algal
productivity
and
respiration.
Several
of
these
parameters
will
be
set
based
on
data
collected
in
the
field
and
laboratory.
Although
model
parameters
can
be
simulated
over
time
(
dynamic
conditions),
QUAL2E
is
limited
to
steady­
state
hydraulic
conditions.
Since
the
boundary
conditions
for
flow
are
expected
to
be
constant,
the
model
is
referred
to
as
quasi­
dynamic
or
quasi­
steady
state.

For
modeling
purposes,
the
study
area
of
Sims
Branch
will
be
divided
into
segments
based
on
stream
physical
characteristics
including
stream
depth,
width,
channel
slope,
and
water
timeof
travel
(
velocity).
Water
quality
characteristics
described
by
the
calibration
data
set
will
be
utilized
in
conjunction
with
the
critical
flow
and
temperature
analysis
to
determine
the
rates
and
boundary
conditions
required
for
the
developed
model.
The
model
will
then
be
calibrated
with
the
adjustment
of
certain
water
quality
parameters
within
regulatory
accepted
ranges.
Parameters
involved
in
the
calibration
procedure
include
those
which
most
affect
the
receiving
water
such
as
flow,
D.
O.,
carbonaceous
BOD,
organic
nitrogen
and
ammonia
nitrogen
loadings.
SOD
will
not
be
measured,
and
the
model
will
use
default
values.
In
addition,
an
uncertainty
analysis
will
be
conducted
to
determine
the
degree
of
confidence
placed
in
the
model
and
resulting
allocation.

Field
Water
Quality
Model
Input
In
situ
water
quality
results
for
critical
model
parameters
will
be
utilized
for
calibration
of
the
developed
model.
Since
these
samples
will
be
collected
with
the
dye
time­
of­
travel,
the
samples
represent
the
water
quality
characteristics
of
a
specific
volume
of
river
water
(
slug)
as
it
travels
downstream
from
the
Airport.
In
addition,
since
the
water
quality
characteristics
of
this
volume
of
water
describe
the
physical,
chemical,
and
biological
reactions
and
interactions
occurring
as
it
travels
downstream,
these
characteristics
will
be
used
to
determine
the
decay
Metro
Nashville
Airport
Authority
(
MNAA)
NPDES
Permit
TN0064041
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39
of
40
rates
required
for
model
development.
The
decay
rates
of
concern
in
the
model
include
those
which
affect
the
level
of
D.
O.
in
the
river
and
include
the
deoxygenation
of
BOD
and
nitrification
processes
resulting
from
the
decay
of
organic
nitrogen
to
ammonia
nitrogen
and
ammonia
nitrogen
to
nitrite
nitrogen
and
then
to
nitrate
nitrogen.
Prior
to
entry
into
QUAL2E,
rates
must
be
adjusted
from
measured
temperatures
to
the
standard
temperature
accepted
by
the
model.

The
first­
order
reaction
rates
that
will
be
developed
from
analysis
of
concentration
with
time
of
travel
downstream
will
include
CBODu,
organic
nitrogen,
and
ammonia
nitrogen.
These
rates
will
be
independently
determined
and
entered
into
the
calibration
model.
No
blind
curve
fitting
of
the
model
will
be
attempted
and
any
adjustments
to
these
rates
will
only
be
done
after
a
careful
review
of
the
data
sets.

Reaeration
rates
will
be
calculated
using
Tennessee/
EPA
Region
4
guidance.
Water
elevation
changes
will
be
obtained
from
existing
sources
(
i.
e.,
USGS
quadrangles),
and
velocities
will
be
modeled
based
on
the
equation
V=
aQ
b,
where
a
and
b
can
be
determined
from
multiple
field
measurements.

Results
from
the
time­
series
BOD
samples
will
be
utilized
for
two
purposes.
First,
the
CBODu
concentrations
determined
for
each
of
the
samples
collected
with
dye
time­
of­
travel
will
be
plotted
versus
the
associated
time­
of­
travel
for
each
station.
A
first­
order
curve
fit
of
this
plot
(
exponential
curve
fit
or
a
straight
line
on
semilog
paper)
will
be
used
to
calculate
the
river
CBODu
deoxygenation
rate,
k1
or
k
r.
The
rates
calculated
will
be
used
in
the
calibration
and
model.
Secondly,
the
time­
series
BOD
analyses
of
CBODu
for
the
river/
effluent
dilution
samples
will
be
used
to
establish
a
CBODu/
BOD5
ratio.
This
ratio
will
be
used
to
project
the
total
mass
CBODu
loadings
projected
in
the
model
to
a
BOD5
mass
loading
for
establishing
permit
limits.

The
oxygen
utilized
in
the
samples
will
be
analyzed
generally
using
Standard
Methods
(
APHA
1994),
No.
5210
C,
Ultimate
BOD
Test
or
another
accepted
method
to
characterize
both
the
carbonaceous
and
nitrogenous
kinetics
of
BOD.

Organic
nitrogen
and
ammonia
nitrogen
results
for
the
samples
will
be
plotted
versus
time­
oftravel
downstream.
A
first
order
curve
fit
of
these
data
will
be
used
to
determine
the
organic
nitrogen
and
ammonia
nitrogen
deoxygenation
rates
for
input
into
the
model.

Chlorophyll
a
results
may
also
be
input
into
the
model
to
simulate
primary
productivity
of
algae
if
appropriate.
The
diurnal
D.
O.
measurements
will
be
used
to
project
through
sinusoidal
curve
fitting
the
minimum,
maximum
and
average
D.
O.
at
each
station.
The
midpoint
of
the
diurnal
D.
O.
fluctuation
is
used
as
the
target
D.
O.
for
model
calibration.
The
fluctuation
in
D.
O.
concentrations
in
Sims
Branch
resulting
from
algal
productivity
and
respiration
will
be
utilized
not
only
during
the
calibration
and
validation
of
the
developed
model,
but
also
to
ensure
that
model
allocations
remain
within
regulatory
limits.

Calibration
The
measured
rates
will
be
entered
into
the
model
and
the
model
output
will
be
compared
against
the
individual
field­
measured
parameters
(
e.
g.,
CBODu,
organic­
nitrogen,
etc.)
and
D.
O..
Adjustments
to
individual
rates
and
parameters
to
better
fit
the
individual
curves
and
the
Metro
Nashville
Airport
Authority
(
MNAA)
NPDES
Permit
TN0064041
Page
40
of
40
D.
O.
data
will
be
done
based
on
small
adjustments
to
one
rate
at
a
time.
Once
the
model
is
found
to
provide
acceptable
fits
of
the
data,
no
further
adjustments
will
be
made.

Sensitivity
Analysis
Once
the
calibration
model
is
completed,
sensitivity
analysis
will
be
completed
for
each
significant
model
rate
and
background
parameter.
These
are
adjusted
one
at
a
time
about
plus
or
minus
25
to
50
percent
of
the
model
rate
or
value.
The
most
sensitive
parameters
are
typically
flow,
water
temperature,
reaeration
rate,
and
the
CBODu
deoxygenation
rate.

2.5
Continuous
Monitoring
Having
an
adequate
data
set
of
in
stream
water
quality
data
for
Sims
Branch
under
many
varying
conditions
will
be
important
in
the
development
of
an
accurate
and
robust
water
quality
model.
Therefore,
in
addition
to
the
intense
time­
of­
travel
field
surveys,
additional
data
will
be
gathered
throughout
the
study
period
on
an
intermittent
basis.
Additional
data
will
help
refine
the
model
and
allow
testing
of
predictions
during
development.

At
least
once
per
month
during
the
study
period
between
intensive
time­
of­
travel
surveys,
in
situ
measurements
of
water
quality
parameters
(
i.
e.,
D.
O.,
temperature,
conductivity,
pH)
will
be
taken.
Field
personnel
will
walk
the
length
of
Sims
Branch
to
Mill
Creek
and
back
again,
taking
the
appropriate
readings
with
a
portable
instrument
at
fixed
stations
identified
during
the
reconnaissance
study.
The
instrument
will
be
appropriately
calibrated
prior
to
each
assessment.

In
addition,
a
Sims
Branch
"
permanent"
flow
monitoring
station
will
be
established
at
the
Airport
access
road
retention
dam.
Sims
Branch
passes
through
long
twin
square
culverts
at
the
access
road.
A
bubbler
or
other
device
for
measuring
depth
of
flow
will
be
deployed.
Using
Manning's
equation,
culvert
geometry,
and
the
depth
of
flow
through
the
culvert,
the
flow
in
Sims
Branch
can
be
accurately
determined.
The
flows
determined
in
this
fashion
will
be
checked
against
the
field
measured
values
using
cross­
section
and
current
meters.
A
permanent
written
or
electronic
record
of
daily
flows
will
be
generated.

2.6
Model
Validation
As
in
independent
test
of
the
calibration
and
robustness
of
the
calibrated
model,
a
new
set
of
data
(
not
previously
used
during
the
calibration
of
the
model)
will
be
collected
and
compared
to
model
predictions.
The
Model
Validation
field
study
will
gather
many
of
the
same
types
of
information
as
collected
during
the
winter­
and
summer­
time
time­
of­
travel
studies,
but
will
be
shorter
and
quicker.
Use
of
Rhodamine
WT
tracer
dye
is
not
anticipated.
However,
measurements
of
flow,
water
quality,
diurnal
D.
O.,
etc.
will
be
conducted.
If
the
model
needs
adjusting
to
accurately
predict
conditions
encountered
during
the
validation
study,
this
will
be
noted
and
the
appropriate
changes
made.

2.7
Wasteload
Allocation
Modeling
Metro
Nashville
Airport
Authority
(
MNAA)
NPDES
Permit
TN0064041
Page
41
of
40
Once
a
water
quality
model
has
been
satisfactorily
calibrated,
it
will
be
used
to
determine
the
point
source
value
of
CBODu
and
NH3­
N
resulting
in
a
D.
O.
sag
curve
which
remains
above
the
regulatory
standard
(
target
D.
O.).
The
CBODu
values
will
then
be
converted
into
5­
day
BOD
values
for
establishing
proposed
permit
limits.
Using
this
method,
wasteload
allocations
will
be
determined
for
the
MNAA
discharge
for
both
summer
and
winter
conditions,
and
at
varying
background
flows
in
Sims
Branch
as
appropriate.

2.8
Final
Report
Following
completion
of
the
wasteload
allocation
and
modeling
study,
the
MNAA
will
submit
a
final
report
summarizing
all
methodologies,
data,
and
results
to
TDEC.
The
report
will
include
maps
and
figures,
with
both
tabular
and
graphical
presentations
of
the
study
results,
as
well
as
any
other
information
supplemental
to
the
wasteload
allocation
study.
Disks
of
the
model
inputs
will
be
included.
A
recommended
wasteload
allocation
plan
will
be
prepared.

The
final
report
will
include,
but
not
be
limited
to,
the
following:

 
Summaries
and
data
from
all
monitoring
activities;

 
Descriptions
of
methodologies
applied
during
field
data
collection
and
laboratory
analysis;

 
Results
of
all
modeling
efforts
(
calibration,
validation,
prediction);

 
Study
area
maps
and
receiving
system
schematics;

 
Hydraulic,
water
quality,
and
other
parameters
characterized
during
the
field
surveys
and
results;

 
Projections
of
a
WLA
for
the
facility
during
winter
and
summer
under
varying
flow
conditions,
and;

 
Suggested
permit
limits
and
verbiage
for
inclusion
in
the
final
facility
NPDES
permit.
Metro
Nashville
Airport
Authority
(
MNAA)
NPDES
Permit
TN0064041
Page
42
of
40
3.0
SCHEDULE
As
discussed
in
the
previous
sections,
the
wasteload
allocation
study
consists
of
many
components.
In
order
to
ensure
a
successful
study,
it
is
necessary
to
schedule
each
component
as
carefully
as
possible.
It
is
anticipated
that
the
study
as
outlined
in
this
Work
Plan
will
be
concluded
by
the
summer
of
2003,
with
the
final
report
being
submitted
to
TDEC
on
June
1,
2003.
The
proposed
schedule
for
each
task
is
outlined
in
Table
3­
1.

Table
3­
1.
MNAA
Sims
Branch
WLA
Study
Schedule
No.
Task
Proposed
Date(
s)
1
Work
Plan
approval
granted
by
TDEC
12/
5/
2001
2
Reconnaissance
Study
12/
10/
2001
 
12/
11/
2001
3
Winter
time­
of­
travel
12/
27/
2001
 
12/
28/
2001
4
Winter
time­
of­
travel
(
additional,
if
warranted)
1/
3/
2002
 
1/
4/
2002
5
Data
reduction
and
analyses,
time
series
BOD,
etc.
1/
4/
2002
 
5/
1/
2002
6
Continuous
in
stream
monitoring
2/
1/
2002
 
11/
1/
2002
7
Interim
Report
6/
1/
2002
8
Summer
time­
of­
travel
7/
1/
2002
 
7/
2/
2002
9
Summer
time­
of­
travel
(
additional,
if
warranted)
7/
8/
2002
 
7/
9/
2002
10
Data
reduction
and
analyses,
time
series
BOD,
etc.
7/
9/
2002
 
11/
1/
2002
11
Validation
study
12/
30/
2002
 
12/
31/
2002
12
Data
reduction,
analyses,
and
WLA
modeling
12/
31/
2002
 
3/
1/
2003
13
Draft
Final
Report
submitted
to
TDEC
5/
1/
2003
14
Final
Report
6/
1/
2003
Every
effort
will
be
made
to
adhere
to
the
dates
listed
in
Table
3­
1.
However,
due
to
the
nature
of
field
studies
and
uncertainties
inherent
with
such
studies,
it
may
become
necessary
to
adjust
the
dates
somewhat.
It
is
important
to
remain
flexible
to
account
for
unanticipated
changes
that
may
be
dictated
by
field
conditions,
weather,
or
even
the
data
generated
by
earlier
studies.
Regardless
of
what
changes
may
become
necessary
in
the
schedule,
the
overall
completion
date
of
June
1,
2003
will
not
be
changed.
Metro
Nashville
Airport
Authority
(
Addendum)
NPDES
Permit
No.
TN0064041
Page
No.
A­
1
of
A­
8
ADDENDUM
TO
RATIONALE
Metro
Nashville
Airport
Authority
PERMIT
NO.
TN0064041
September
18,
2003
Addendum
prepared
by:
Mr.
Vojin
Janjic
The
Metropolitan
Nashville
Airport
Authority
(
MNAA)
existing
individual
NPDES
permit
required
MNAA
to
perform
a
Waste
Load
Allocation
(
WLA)
study.
The
purpose
of
the
study
is
to
determine
the
impact
on
water
quality
and
to
set
permit
limits
for
the
discharge
from
the
treatment
facility
which
discharges
to
Sims
Branch
via
Outfall
002.

The
existing
permit
required
that
the
overall
completion
date
of
June
1,
2003
for
the
WLA
study
must
be
met,
regardless
of
what
changes
may
become
necessary
in
the
details
and
interim
reporting
dates.
After
several
revisions
of
the
draft
study
were
made
according
to
division's
recommendations,
the
final
version
was
submitted
in
a
timely
manner,
on
May
30,
2003.
The
significance
to
meet
this
compliance
date
was
to
allow
for
sufficient
time
for
this
permit
to
be
modified
prior
to
the
2003/
2004
deicing
season.
The
purpose
of
this
addendum
to
rationale
is
to
summarize
changes
in
effluent
limitations
and
monitoring
requirements
at
Outfall
002,
based
on
the
findings
of
the
WLA
study.
The
effluent
limitations,
monitoring
requirements
and
other
conditions
for
all
other
outfalls,
as
described
in
the
NPDES
Permit
TN0064041,
will
remain
unchanged.

Several
stream
characterization
samples
were
collected
as
part
of
the
Sims
Branch
WLA.
The
characterization
sampling
was
performed
during
the
different
seasons
of
the
year
to
provide
data
applicable
to
each
season.
Seasonal
sampling
was
a
key
to
this
study
because
of
the
nature
of
discharge
from
MNAA.
Deicing
only
occurs
in
the
colder
months
of
the
year.
For
this
reason,
samples
were
collected
and
analyzed
according
to
the
typical
bounds
of
the
deicing
season.
A
seven
month
period
represents
the
potential
months
when
deicing
may
occur.
This
period,
the
Winter
Period,
includes
October
through
April
of
each
year.
These
months
also
correspond
to
the
wetter
months
of
the
year,
thus
providing
additional
assimilative
capacity
to
deal
with
the
discharged
treated
flow
from
Outfall
002.
The
remaining
period
of
the
year,
the
Summer
Period,
includes
May
through
September.
This
period
does
not
see
any
deicing
activity.
Additionally,
flows
are
lower
in
Sims
Branch,
and
since
temperatures
are
higher,
dissolved
oxygen
(
DO)
is
lower.
Therefore,
this
period
of
the
year
is
considered
separately.
Each
of
these
seasons
is
reflected
in
sampling
schemes,
data
analysis,
and
permit
limits.

The
Winter
Event
was
performed
on
December
28­
29,
2001.
This
was
the
first
of
the
two
extensive
sampling
efforts
performed
as
part
of
the
WLA.
This
twoday
period
is
within
two
weeks
of
the
midpoint
of
the
winter
period.
The
data
obtained
from
the
event
provided
a
good
characterization
of
the
typical
conditions
during
a
Winter
Period
discharge
from
Outfall
002.
2.53
14.03
5.78
8.64
3.72
3.28
4.14
2.69
0
2
4
6
8
10
12
14
16
0
0.5
1
1.5
2
2.5
DISTANCE
FROM
CONFLUENCE
WITH
MILL
CREEK
(
MI)
CBOD
(
mg/
L)
JB2
JB4
JB6
JB14
JB8
JB10
JB11
JB12
TRIB
5
TRIB
6
TRIB
4
STEP
AERATOR
EFF.

Ultimate
CBOD
concentrations
for
the
Winter
Metro
Nashville
Airport
Authority
(
Addendum)
NPDES
Permit
No.
TN0064041
Page
No.
A­
2
of
A­
8
The
Summer
Event
was
performed
on
July
8­
9,
2002.
This
was
the
second
of
the
two
extensive
sampling
efforts
performed
as
part
of
the
WLA.
This
two­
day
period
is
within
a
few
days
of
the
mid­
point
of
the
summer
period.
The
data
from
this
event
characterizes
the
discharge
from
Outfall
002
during
the
warmer
months
of
the
year.

In
addition
to
the
Winter
Event
and
Summer
Event,
environmental
quality
samples
were
also
collected
during
several
one­
day
sampling
events.
The
sampling
was
much
less
extensive
and
did
not
include
ultimate
carbonaceous
biochemical
oxygen
demand
(
CBODu)
sampling
as
was
included
during
the
extensive
Winter
and
Summer
Events.
Also,
additional
time
of
travel
sampling
was
not
performed.
However,
the
data
that
was
obtained
during
these
events
did
provide
sufficient
information
for
a
model
validation
scenario.

Once
the
field
investigations
and
sampling
events
were
complete,
all
relevant
data
available
was
gathered,
and
the
task
of
organization
and
analysis
was
performed.
The
data
was
then
used
to
develop
and
calibrate
a
model
of
Sims
Branch.
The
model
selected
to
perform
the
WLA
study
was
the
Qual2E
model
developed
by
the
U.
S.
EPA.
This
model
requires
many
types
of
data
inputs
to
perform
acceptable
model
runs.
Although
it
is
possible
to
perform
model
runs
using
default
values,
data
developed
through
a
study
such
as
this
one
will
result
in
a
better
and
more
reliable
water
quality
model.
Therefore,
strict
attention
was
given
to
an
accurate
assessment
of
all
available
data
to
improve
the
output
from
the
Qual2E
model
runs.

The
extensive
environmental
data
collected
during
sampling
events
was
analyzed
and
used
to
develop
and
calibrate
the
Qual2E
model.
The
development
and
calibration
of
the
Qual2E
model
was
performed
based
on
the
period
of
the
year
to
be
evaluated.
Each
calibration
was
based
on
the
major
sampling
event
performed
for
each
period
of
the
year.
The
Winter
Event
(
December
28­
29,
2001)
was
used
as
the
base
scenario
for
the
Winter
Period
(
October
 
April).
Likewise,
the
Summer
Event
(
July
8­
9,
2002)
was
used
as
the
base
scenario
for
the
Summer
Period
(
May
 
September).

Several
conservative
measures
have
been
employed
in
the
development
of
this
model.
Some
noteworthy
conservative
aspects
of
the
calibrated
model
for
scenario
assessment
include:
 
A
wide
range
of
headwaters
flow
conditions
is
used
to
perform
the
scenarios;
 
The
75
th
percentile
flow
was
used
for
the
discharge
flow,
even
during
very
low
flow
headwaters
conditions;
 
The
outlying
period
for
the
Winter
Period
was
April
30
(
deicing
activity
typically
is
over
before
April
of
every
year);
and
 
One­
half
the
diurnal
flow
variation
was
used
for
comparison
of
model
results
to
the
water
quality
standard
(
5.5
mg/
L
versus
the
5.0
mg/
L
WQS).
The
conservative
approach
provided
sufficient
safety
factors
toward
developing
appropriate
permit
limits
for
the
Outfall
002
discharge;
however,
some
aspects
of
a
worst
case
scenario
0
2
4
6
8
10
12
14
16
0
0.5
1
1.5
2
2.5
DISTANCE
FRO
CONFLUENCE
WITH
MILL
CREEK
(
MI)
CBOD
(
mg/
L)

model
actual
JB2
JB4
JB6
JB14
JB8
JB10
JB11
JB12
TRIB
5
TRIB
6
TRIB
4
STEP
AERATOR
EFF.

Winter
Event
CBODu
Actual
versus
Model
Metro
Nashville
Airport
Authority
(
Addendum)
NPDES
Permit
No.
TN0064041
Page
No.
A­
3
of
A­
8
should
still
be
evaluated.
This
was
accomplished
by
performing
scenarios
for
the
outlying
limits
of
the
seven
month
and
five
month
periods
to
evaluate
the
potential
impact.

The
ultimate
purpose
of
this
study
is
to
provide
a
basis
for
recommending
appropriate
discharge
limits
for
the
MNAA
Outfall
002.
The
flow
of
Outfall
002
represents
the
treated
stormwater
discharge
from
the
main
terminal
and
ramp
areas
of
the
Nashville
International
Airport
property.
The
stormwater
discharge
includes
flows
from
deicing
activities
during
the
winter
months
of
the
year.

There
is
always
some
element
of
BOD
contained
in
airport
discharge.
However,
levels
remain
very
low
during
the
Summer
Period
of
the
year.
The
major
source
of
BOD
in
airport
runoff
is
deicing
fluid.
Deicing
only
takes
place
during
the
cold
periods
of
the
year;
the
period
is
almost
exclusively
bound
between
the
months
of
October
and
April
of
the
year.
Consequently,
the
limits
recommended
by
this
report
are
relevant
to
this
timeframe.
Limits
are
recommended
for
the
period
between
October
and
April,
and
separate
limits
are
recommended
for
the
period
between
May
and
September.
These
are
the
same
periods
proposed
by
the
division's
personnel
during
the
last
permit
review.

It
is
important
to
note
the
extensive
range
of
variables
that
affect
the
impact
of
any
pollutant
source
on
a
receiving
stream.
The
discharge
from
Outfall
002
is
a
classic
example.
For
any
particular
discharge
flow,
there
is
an
associated
CBOD
concentration.
This
particular
flow
and
concentration
could
have
a
range
of
impacts
on
the
water
quality
of
Sims
Branch.
Factors
that
influence
these
impacts
include:
weather
conditions,
air
temperature,
water
temperatures
(
Sims
Branch
and
effluent),
pre­
existing
dissolved
oxygen
concentrations
(
Sims
Branch
and
effluent),
pre­
existing
CBOD
concentrations
in
Sims
Branch,
and
background
flow
of
Sims
Branch.
It
would
be
preferable
to
develop
a
matrix
or
a
real­
time
model
as
part
of
the
discharge
permit;
however,
this
is
not
currently
practical
for
the
State
of
Tennessee
or
MNAA
because
of
insufficient
staff
and
resources.
Such
a
concept
is
also
limited
because
of
the
required
time
to
evaluate
CBOD
levels
in­
stream
as
well
as
in
the
Outfall
002
discharge.
If
future
advancements
are
made
in
water
quality
sampling
and
analysis
practices
and
the
additional
staff
to
perform
such
an
evaluation
were
available,
such
a
standard
would
provide
a
much
more
real­
time
management
of
the
water
quality
of
Sims
Branch.

The
Winter
Period
recommendations
are
based
on,
a)
model
runs
that
show
no
DO
concentration
that
dips
below
the
water
quality
standard
along
the
entire
length
of
Sims
Branch,
and
b)
the
evaluation
of
the
technological
capability
of
the
treatment
unit.
The
technological
evaluation
demonstrated
that
under
certain
influent
conditions,
even
a
92%
reduction
of
CBOD5
would
yield
concentrations
in
excess
of
250
mg/
L.
However,
these
conditions
typically
occur
when
flows
are
lower
in
Sims
Branch
and
in
the
treatment
unit.
The
critical
period
for
CBOD5
concentrations
is
found
when
a
great
deal
of
deicing
is
required
and
relatively
low
rainfall
or
snow
melt
totals
are
available
to
carry
the
deicing
fluids.
Therefore,
the
major
concern
is
during
cold,
dryer
periods
of
the
winter.
When
these
periods
occur
and
high
influent
concentrations
are
detected,
flow
into
the
treatment
unit
can
be
stopped
and
flows
can
be
retained
until
additional
stormwater
is
available
for
dilution
and
treatment.
This
option
was
exercised
in
December
2002.
If
the
capacities
of
the
treatment
unit
and
retention
ponds
are
exceeded
when
a
high
concentration
is
measured
in
the
influent
of
the
treatment
pond,
flow
can
be
diverted
to
the
Metro
sanitary
sewer
collection
system.
This
addresses
the
critical
time
for
CBOD5
concentrations.
Metro
Nashville
Airport
Authority
(
Addendum)
NPDES
Permit
No.
TN0064041
Page
No.
A­
4
of
A­
8
The
limits
for
higher
flow
periods
are
not
problematic
for
the
treatment
unit
because
of
the
available
dilution
from
stormwater.
The
permittee
recommended
the
highest
concentration
allowed
during
the
winter
months
to
be
150
mg/
L
for
a
single
sample
for
any
flow
of
3
cfs
or
greater.
This
recommendation
was
based
on
model
runs
with
the
stream
flow
set
at
3
cfs
with
a
discharge
concentration
of
150
mg/
L.
Although
higher
concentrations
may
be
assimilated
by
Sims
Branch
at
higher
flows,
concentrations
are
not
critical
at
these
higher
flow
conditions
and
the
recommended
150
mg/
L
concentration
will
further
contribute
to
the
protection
of
the
health
of
Sims
Branch.

The
discharge
permit
limits
recommended
by
the
permittee
for
the
Winter
Period
are
presented
in
Table
A.
One
sample
was
recommended
per
week
during
the
Winter
Period
of
the
year
because
it
is
the
critical
period
of
the
year
for
elevated
CBOD
concentrations
in
the
discharge
from
Outfall
002.

Table
A
Permittee
Recommended
Water­
Quality
Based
Effluent
Limits
for
the
Winter
Period
(
October
 
April)

EFFLUENT
LIMITATIONS
MONTHLY
DAILY
MONITORING
REQUIREMENTS
Receiving
Stream
Flow
>
0
CFS
and
<
0.5
CFS
CBOD5
25
30
1/
Week
Grab
Receiving
Stream
Flow
>
0.5
CFS
and
<
1
CFS
CBOD5
45
50
1/
Week
Grab
Receiving
Stream
Flow
>
1
CFS
and
<
3
CFS
CBOD5
65
75
1/
Week
Grab
Receiving
Stream
Flow
>
3
CFS
CBOD5
135
150
1/
Week
Grab
The
WLA
allocation
study,
as
indicated
above,
showed
that
relatively
high
concentrations
of
CBOD5
can
be
discharged
into
Sims
branch
during
winter
months
without
violating
the
instream
water
quality
criteria.
However,
it
is
division's
position
that
the
entire
assimilative
capacity
of
a
receiving
stream
should
not
be
allocated
to
one
source,
particularly
when
the
receiving
stream
segment
(
Sims
Branch,
ID
TN05130202007_
0150)
is
impaired
for
"
Organic
enrichment/
Low
DO."
Furthermore,
most
surface
water
discharges
must
provide
a
minimum
degree
of
treatment.
For
industries
subject
to
a
federal
Effluent
Limitation
Guideline(
s),
the
guideline
will
provide
the
minimum
degree
of
treatment.
In
the
absence
of
federal
guidelines,
Tennessee
Rule
1200­
4­
5­.
03:
Effluent
Limitations
for
Effluent
Limited
Segments
states,
in
part:

"[ ]
treatment
units
will
be
required
to
achieve
as
a
minimum
the
following
as
maximum
effluent
limitations
when
such
parameters
are
present
as
a
result
of
processes
causing
the
contamination
or
discharges:
Metro
Nashville
Airport
Authority
(
Addendum)
NPDES
Permit
No.
TN0064041
Page
No.
A­
5
of
A­
8
(
1)
Municipal
and
domestic
wastewater
treatment
plants
Monthly
Weekly
Daily
Paramete
r
Avg.
(
mg/
l)
Avg.
(
mg/
1)
Max.
(
mg/
1)

BOD5
30
40
45
TSS
30
40
45
(
2)
Industrial
wastewater
treatment
plants
Parameter
Daily
Maximum
Concentrations
(
mg/
l)

Oil
and
Grease
(
a)
30
(
b)
No
visible
or
floating
oil
or
grease
pH
(
6.0
to
9.0)
*
Suspended
Solids
40
Settleable
solids
0.5
ml/
l
*
In
the
case
of
biological
treatment
units,
the
daily
maximum
TSS
may
be
120
mg/
l.

The
nature
of
the
MNAA's
treatment
system
and/
or
effluent
can
not
be
classified
in
neither
of
the
two
above
listed
categories.
However,
these
tables
were
included
in
this
addendum
to
rationale
to
illustrate
that
technology­
based
limits,
as
well
as
results
of
treatability
studies,
can
be
used
in
establishing
effluent
limitations
for
point
source
discharges.
During
the
last
two
permit
terms,
the
division
requested
monitoring
of
untreated
and
treated
wastewater
in
order
to
evaluate
efficiency
of
the
wastewater
treatment
system.
A
comprehensive
table
with
efficiency
analysis
is
attached
at
the
end
of
this
addendum
to
rationale.
Outfall
02A
depicts
CBOD5
concentrations
in
untreated,
while
Outfall
002
represents
CBOD5
concentrations
in
treated
wastewater.
Metro
Nashville
Airport
Authority
(
Addendum)
NPDES
Permit
No.
TN0064041
Page
No.
A­
6
of
A­
8
In
the
permit
writer's
BPJ,
a
subset
of
this
data
should
be
used
to
better
represent
treatment
efficiency
during
winter,
and
under
CBOD5
loading
originating
from
deicing
activities.
It
was
difficult
to
ascertain
incoming
CBOD5
concentrations
that
positively
correspond
to
application
of
deicing
fluids.
Instead,
measurements
not
likely
to
be
associated
with
deicing
activities
were
excluded
from
the
data
set.

It
should
be
noted
that
exclusion
of
relatively
low
incoming
concentrations
of
CBOD5
(<
100
mg/
L)
did
not
significantly
change
treatment
system
efficiency
from
the
concentration
or
loading
aspect.
However,
the
resulting
average
concentrations
of
treated
wastewater
were
increased.
This,
in
the
permit
writer's
BPJ,
more
accurately
represents
wastewater
treatment
performance
under
full
pollutant
load
in
winter
period.
Table
B
presents
the
recommended
discharge
permit
limits
for
the
Winter
Period.
The
proposed
daily
maximum
limitations
were
derived
from
monthly
average
limitations,
using
the
ratio
from
Tennessee
Rule
1200­
4­
5­.
03
(
30:
45
mg/
L,
see
table
above),
and
based
on
established
division
practice
applied
to
various
biological
wastewater
treatment
plants
across
the
state.
92%
83%

Date
02A
Maximum
Concentration
002
Maximum
Concentration
efficiency
efficiency
02A
Maximum
FLOW
02A
Loading
002
Maximum
FLOW
002
Loading
mg/
L
mg/
L
mg/
L
mg/
L
MGD
lb/
day
MGD
lb/
day
09/
30/
1996
524
14
42
86
0.50
2203
0.69
80
02/
28/
1997
190
58
15
31
0.50
799
0.24
114
01/
31/
1998
340
92
28
56
0.62
1755
0.98
749
02/
28/
1998
590
98
48
97
0.47
2308
0.97
789
03/
31/
1998
340
53
28
56
0.47
1330
1.52
672
04/
30/
1998
220
12
18
36
0.47
861
0.72
72
12/
31/
1998
3090
9
251
510
0.01
258
1.10
82
01/
31/
1999
1520
360
123
251
0.49
6212
1.15
3447
02/
28/
1999
133
14
11
22
0.51
561
0.57
66
11/
30/
1999
109
2
9
18
0.49
443
1.30
22
12/
31/
2000
1100
25
89
182
0.59
5413
0.50
104
01/
31/
2001
3110
104
252
513
0.44
11516
0.01
10
02/
28/
2001
488
21
40
81
0.49
2006
0.53
92
12/
04/
2002
1560
18
126
257
0.33
4293
0.04
6
02/
13/
2003
439
55
36
72
0.34
1248
0.34
156
02/
21/
2003
176
42
14
29
0.43
630
0.43
150
02/
28/
2003
318
142
26
52
0.41
1098
0.41
490
03/
07/
2003
528
80
43
87
0.24
1039
0.24
157
03/
14/
2003
249
19
20
41
0.02
31
0.02
2
Average
791
64
64
131
0.41
2316
0.62
382
92%
Efficiency
83%
Load
eff.
Metro
Nashville
Airport
Authority
(
Addendum)
NPDES
Permit
No.
TN0064041
Page
No.
A­
7
of
A­
8
Table
B:
Recommended
Effluent
Limits
for
the
Winter
Period
(
October
 
April)

EFFLUENT
LIMITATIONS
MONTHLY
DAILY
MONITORING
REQUIREMENTS
Receiving
Stream
Flow
>
0
CFS
and
<
0.5
CFS
CBOD5
25
38
1/
Week
Grab
Receiving
Stream
Flow
>
0.5
CFS
and
<
1
CFS
CBOD5
45
68
1/
Week
Grab
Receiving
Stream
Flow
>
1
CFS
and
<
3
CFS
CBOD5
65
98
1/
Week
Grab
Receiving
Stream
Flow
>
3
CFS
CBOD5
65
Report
1/
Week
Grab
Only
one
sample
per
month
is
recommended
during
the
Summer
Period
as
no
deicing
activity
typically
occurs
during
the
Summer
Period.
However,
the
limits
recommended
for
the
Summer
Period
are
much
lower
than
those
for
the
Winter
Period.
This
is
recommended
because
of
the
typically
lower
flows,
higher
air
and
water
temperatures,
and
thus
lower
in­
stream
DO
concentrations
found
during
the
summer
months.
It
is
recommended
that
MNAA
make
every
effort
to
prevent
discharge
when
the
flow
of
Sims
Branch
is
below
0.5
cfs.
However,
permit
limits
are
recommended
to
accommodate
a
situation
requiring
discharge
during
such
a
flow
scenario.

MNAA
does
not
have
any
significant
source
of
BOD
other
than
deicing
activities,
which
only
occur
during
the
colder
months
of
the
year.
Therefore,
it
is
recommended
that
MNAA
only
be
required
to
report
concentrations
when
discharges
occur
when
stream
flows
are
above
1.5
cfs
during
the
Summer
Period.
Table
C
presents
the
recommended
discharge
permit
limits
for
the
Summer
Period.

Table
C:
Recommended
Effluent
Limits
for
the
Summer
Period
(
May
 
October)
EFFLUENT
LIMITATIONS
MONTHLY
DAILY
MONITORING
REQUIREMENTS
Receiving
Stream
Flow
>
0
CFS
and
<
0.5
CFS*
CBOD5
3
4.5
1/
Month
Grab
Receiving
Stream
Flow
>
0.5
CFS
and
<
1
CFS
CBOD5
6
9
1/
Month
Grab
Receiving
Stream
Flow
>
1
CFS
and
<
1.5
CFS
CBOD5
12
18
1/
Month
Grab
Receiving
Stream
Flow
>
1.5
CFS
CBOD5
Report
Report
1/
Month
Grab
*
Note:
Permittee
should
make
every
effort
to
prevent
discharge
when
the
flow
of
Sims
Branch
is
below
0.5
cfs.
However,
if
discharge
is
necessary,
these
limits
apply.

The
WLA
study
has
resulted
in
a
calibrated
model
of
Sims
Branch
capable
of
appropriately
assessing
the
impact
of
the
Outfall
002
discharge
on
the
environment.
The
result
is
proposed
permit
limits
based
on
real­
world
data
and
the
technological
treatment
capability
of
the
treatment
unit.
The
limits
are
both
reasonable
for
MNAA
as
well
as
protective
of
the
environment.
VMJ
Permit
Addendum
TN0064041.
DOC
Metro
Nashville
Airport
Authority
(
Addendum)
NPDES
Permit
No.
TN0064041
Page
No.
A­
8
of
A­
8
COMPREHENSIVE
TREATMENT
UNIT
EFFICIENCY
ANALYSIS
91%
83%

Date
02A
Maximum
Concentration
002
Maximum
Concentration
efficiency
efficiency
02A
Maximum
FLOW
02A
Loading
002
Maximum
FLOW
002
Loading
mg/
L
mg/
L
mg/
L
mg/
L
MGD
lb/
day
MGD
lb/
day
09/
30/
1996
524
14
48
91
0.50
2203
0.69
80
11/
30/
1996
15
3
1
3
0.50
63
0.48
12
12/
31/
1996
12
10
1
2
0.50
50
0.50
42
02/
28/
1997
190
58
17
33
0.50
799
0.24
114
04/
30/
1997
18
4
2
3
0.32
48
0.33
11
06/
30/
1997
13
6
1
2
0.39
42
0.40
20
07/
31/
1997
28
6
3
5
0.30
70
0.39
19
08/
31/
1997
3
3
0
1
0.37
9
0.26
6
09/
30/
1997
14
5
1
2
0.53
61
0.31
13
10/
31/
1997
33
5
3
6
0.43
118
0.31
13
11/
30/
1997
84
3
8
15
0.28
198
0.39
10
12/
31/
1997
12
11
1
2
0.62
62
0.60
55
01/
31/
1998
340
92
31
59
0.62
1755
0.98
749
02/
28/
1998
590
98
54
103
0.47
2308
0.97
789
03/
31/
1998
340
53
31
59
0.47
1330
1.52
672
04/
30/
1998
220
12
20
38
0.47
861
0.72
72
05/
31/
1998
8
4
1
1
0.47
31
1.84
61
06/
30/
1998
2
2
0
0
0.53
9
2.14
36
10/
31/
1998
3
2
0
1
0.18
5
0.30
5
11/
30/
1998
31
6
3
5
0.03
9
0.36
18
12/
31/
1998
3090
9
280
539
0.01
258
1.10
82
01/
31/
1999
1520
360
138
265
0.49
6212
1.15
3447
02/
28/
1999
133
14
12
23
0.51
561
0.57
66
04/
30/
1999
57
4
5
10
0.40
190
1.16
39
11/
30/
1999
109
2
10
19
0.49
443
1.30
22
12/
31/
1999
17
3
2
3
0.57
81
1.09
27
03/
31/
2000
6
1
1
1
0.38
19
1.19
10
05/
31/
2000
4
4
0
1
0.48
16
0.75
25
11/
30/
2000
8
6
1
1
0.56
37
0.59
30
12/
31/
2000
1100
25
100
192
0.59
5413
0.50
104
01/
31/
2001
3110
104
282
543
0.44
11516
0.01
10
02/
28/
2001
488
21
44
85
0.49
2006
0.53
92
03/
31/
2001
90
10
8
16
0.35
262
0.54
45
04/
30/
2001
41
4
4
7
0.39
134
0.50
17
05/
31/
2001
7
5
1
1
0.48
28
0.64
27
11/
20/
2002
17
5
2
3
0.41
58
0.46
19
11/
27/
2002
2
5
0
0
0.08
1
0.16
7
12/
04/
2002
1560
18
142
272
0.33
4293
0.04
6
12/
28/
2002
35
39
3
6
0.14
41
0.10
33
01/
03/
2003
27
25
2
5
0.32
72
0.33
68
01/
10/
2003
61
20
6
11
0.14
72
0.13
21
01/
15/
2003
61
9
6
11
0.05
23
0.60
45
02/
13/
2003
439
55
40
77
0.34
1248
0.34
156
02/
21/
2003
176
42
16
31
0.43
630
0.43
150
02/
28/
2003
318
142
29
55
0.41
1098
0.41
490
03/
07/
2003
528
80
48
92
0.24
1039
0.24
157
03/
14/
2003
249
19
23
43
0.02
31
0.02
2
Average
335
30
30
58
0.38
975
0.61
170
91%
eff
83%
load
eff.
Metro
Nashville
Airport
Authority
(
Rationale)
NPDES
Permit
TN0064041
Page
R­
1
of
R­
28
RATIONALE
__________________________________________________________________________

Metro
Nashville
Airport
Authority
NPDES
PERMIT
NO.
TN0064041
Nashville,
Davidson
County,
Tennessee
Permit
Writer:
Vojin
Janjic
I
DISCHARGER
Metro
Nashville
Airport
Authority
Nashville,
Davidson
County,
Tennessee
Contact
Person:
Mr.
Dewey
Klahn
615­
275­
4501
Nature
of
Business:
Airport
facility
serving
the
Middle
Tennessee
area.

SIC
Code(
s):
4581
(
Airports,
Flying
Fields,
and
Airport
Terminal
Services)
Industrial
Classification:
Secondary
Discharger
Rating:
Minor
II
PERMIT
STATUS
NPDES
Permit
No.
TN0064041
issued
4/
28/
1995
NPDES
Permit
No.
TN0064041
modified
8/
30/
1996
NPDES
Permit
No.
TN0064041
expired
4/
27/
2000
Application
for
Renewal
received
11/
4/
1999
Watershed
Scheduling
Environmental
Assistance
Center:
Nashville
Primary
Longitude:
86­
41­
00
Primary
Latitude:
36­
08­
10
Hydrocode:
5130202
Watershed
Group:
5
Watershed
Identification:
Lower
Cumberland
Target
Reissuance
Date:
2000
Target
Watershed
Evaluation
Date:
2005
Metro
Nashville
Airport
Authority
(
Rationale)
NPDES
Permit
TN0064041
Page
R­
2
of
R­
28
III
FACILITY
DISCHARGES
AND
RECEIVING
WATERS
Metro
Nashville
Airport
Authority
(
MNAA)
discharges
treated
aircraft
deicing
fluid
and
storm
water
runoff
from
Outfall
002,
overflow
from
South
and
North
Ponds
from
Outfalls
003
and
004,
and
storm
water
runoff
from
Outfalls
SW1
through
S11
to
Sims
Branch
at
miles
1.8
to
Mill
Creek
at
mile
1.6
to
the
Cumberland
River
at
mile
194.5
(
Outfall
002);
Sims
Branch
at
miles
1.9
and
2.0
(
Outfalls
003
and
004),
McCrory
Creek
to
Stones
River
at
mile
5.8
(
Outfall
SW1),
Sims
Branch
to
Mill
Creek
at
mile
1.6
to
the
Cumberland
River
at
mile
194.5
(
Outfalls
SW2,
SW3,
SW4,
SW5,
&
SW6);
and
Mill
Creek
to
the
Cumberland
River
at
mile
194.5
(
Outfalls
SW7,
S10,
&
S11).
Storm
water
runoff
and
spills
from
aircraft
deicing
and
fueling
areas
are
routed
through
four
oil­
water
separators
into
two
detention
basins,
pumped
to
a
treatment/
equalization
basin,
and
ultimately
discharged
into
Sims
Branch
at
mile
1.8.

In
the
event
of
a
large
volume
storm
event,
excess
storm
water
runoff,
groundwater
infiltration
and
spills
from
aircraft
deicing
operations
are
routed
directly
into
the
Sims
Branch
at
approximate
miles
1.9
and
2.0
(
respectively,
through
Outfalls
003
and
004),
from
the
South
and
North
Ponds,
bypassing
the
treatment/
equalization
basin.
It
should
be
noted
that
MNAA
now
has
the
capability
and
permission
to
discharge
treated
effluent
to
Metro
Nashville
sanitary
sewer
system.
Outfalls
003
and
004
will
be
comprised
of
the
same
water
quality.
The
frequency
of
discharge
from
Outfall
004
is
anticipated
to
be
higher
than
discharges
from
Outfall
003.
Therefore,
Outfall
004
will
be
considered
representative
for
both
Outfalls
003
and
004.

The
MNAA
property
is
divided
into
ten
storm
water
drainage
areas,
each
discharging
storm
water
runoff
into
the
waters
of
the
state.
Due
to
the
similar
nature
of
the
runoff,
sampling
will
be
required
only
at
Outfalls
SW1,
SW2,
and
SW7.
It
should
be
noted
that
the
runoff
area
served
by
Outfall
002
is
physically
located
within
the
drainage
area
of
Outfall
SW2.
Storm
water
runoff
from
the
Stevens
Aviation,
Inc.,
Tennessee
Air
National
Guard
(
TANG)
and
American
Airlines
Fuel
Storage
Facility
(
TN0063908)
facilities
are
not
a
part
of
this
permit;
these
facilities
will
be
permitted
separately
(
TNR051762).
Appendix
1
summarizes
the
facility
discharges
and
receiving
waters
for
Outfalls
002,
SW1
through
S11.

IV
APPLICABLE
EFFLUENT
LIMITATIONS
GUIDELINES
There
are
no
EPA
effluent
guidelines
for
the
discharges
from
this
facility.
Standards
of
performance
are
therefore
established
in
accordance
with
existing
state
regulations
using
available
treatability
information.
The
facility
is
one
which
has
"
storm
water
associated
with
industrial
activity"
under
the
storm
water
regulations
in
40
CFR
Part
122.26(
b)(
14).

V
PREVIOUS
PERMIT
LIMITS
AND
MONITORING
REQUIREMENTS
Appendix
2
lists
the
permit
limitations
and
monitoring
requirements
as
defined
in
the
previous
permit.
Metro
Nashville
Airport
Authority
(
Rationale)
NPDES
Permit
TN0064041
Page
R­
3
of
R­
28
VI
HISTORICAL
MONITORING
AND
INSPECTION
During
the
previous
permit
term,
there
were
no
effluent
limitations
imposed
on
discharges
from
MNAA
site.
Consequently,
facility's
compliance
history
can
not
be
properly
evaluated.
Nevertheless,
some
conclusions
regarding
effluent
quality
and
its
observed
and/
or
potential
impact
on
the
receiving
stream
can
be
made
based
on
the
data
submitted
during
the
previous
permit
term
(
Appendix
3).
As
expected,
reported
concentrations
of
biodegradable
substances
measured
at
Outfall
002
coincide
with
the
seasonal
application
of
deicing
fluids.
Daily
maximum
values
for
Carbonaceous
Biochemical
Oxygen
Demand,
5­
day
(
CBOD5)
and
Chemical
Oxygen
Demand
(
COD)
correlate
well,
as
presented
in
the
graph.

In
a
period
from
September
1996
to
June
2001,
for
which
the
Outfall
002
data
was
reviewed,
the
COD
to
CBOD5
ratio
was
approximately
2.4.
The
average
value
of
CBOD5
of
26.0
mg/
L,
based
on
54
sample
results,
with
a
standard
deviation
of
63,
indicates
that
effluent
from
wastewater
treatment
plant
is
likely
to
impose
significant
loading
onto
the
receiving
stream.
Based
on
this
information,
the
Division
has
formulated
a
stream
model
to
evaluate
the
assimilative
capacity
of
the
receiving
stream.
The
model
and
its
implications
on
the
effluent
limitations
are
discussed
in
the
Rationale,
Part
VII:
New
Permit
Limits
and
Monitoring
Requirements
(
see
below).

Other
parameters
monitored
during
the
term
of
the
previous
permit
(
TSS,
Oil
and
Grease,
pH)
also
indicate
presence
of
pollutants,
albeit
not
at
levels
as
detrimental
to
the
0
100
200
300
400
500
600
Sep­
96
Dec­
96
Mar­
97
Jun­
97
Sep­
97
Dec­
97
Mar­
98
Jun­
98
Sep­
98
Dec­
98
Mar­
99
Jun­
99
Sep­
99
Dec­
99
Mar­
00
Jun­
00
Sep­
00
Dec­
00
Mar­
01
Concentration
[
mg/
L]
CBOD5
Dmax
COD
Dmax
Metro
Nashville
Airport
Authority
(
Rationale)
NPDES
Permit
TN0064041
Page
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4
of
R­
28
receiving
stream
as
CBOD5.
A
summary
of
the
data
reported
on
Discharge
Monitoring
Report
forms
during
the
previous
permit
term
is
summarized
in
Appendix
3.

VII
NEW
PERMIT
LIMITS
AND
MONITORING
REQUIREMENTS
Proposed
provisions
in
the
permit
for
storm
water
discharges
are
taken
from
the
Tennessee
Storm
Water
Multi­
Sector
General
Permit
for
Industrial
Activities,
which
include
a
storm
water
pollution
prevention
plan
and,
for
some
industries,
storm
water
monitoring
for
industry­
specific
pollutants.
Any
limits
are
based
on
EPA
storm
water
effluent
guidelines,
if
applicable,
or
by
way
of
the
permit
writer's
best
professional
judgment
of
other
technologybased
limit.
If
the
technology­
based
limit
will
allow
violations
of
water
quality
instream,
then
a
lower,
water­
quality­
based
limit
is
applied.
Appendix
5
presents
a
summary
of
the
new
permit
limits
and
monitoring
requirements
set
forth
in
this
permit.

Outfall
002
Limits
on
pH,
Oil
and
Grease,
and
TSS
for
the
wastewater
treatment
system
discharge
at
Outfall
002
were
derived
from
the
previous
NPDES
permits
and
comply
with
maximum
limits
specified
in
Tennessee
Rule
1200­
4­
5­.
03(
2).
Due
to
the
impact
of
past
discharges
on
Sims
Branch,
an
additional
requirement
for
monitoring
minimum
dissolved
oxygen
level
(
per
state
water
quality
criteria
for
Fish
and
Aquatic
Life)
has
been
added
to
this
outfall.

Flow
Flow
shall
be
reported
in
Million
Gallons
per
Day
(
MGD)
and
monitored
at
the
time
of
sample
collection.
Monitoring
of
flow
quantifies
the
load
of
pollutants
to
the
stream.

pH
According
to
the
State
of
Tennessee
Water
Quality
Standards
[
Chapter
1200­
4­
3­
.03(
3)
(
b)],
the
pH
for
the
protection
of
Fish
and
Aquatic
Life
shall
lie
within
the
range
of
6.5
to
9.0
and
shall
not
fluctuate
more
than
1.0
unit
in
this
range
over
a
period
of
24
hours.
The
Tennessee
Rule
1200­
4­
5­.
03(
2),
"
Effluent
Limitations
for
Effluent
Limited
Segments,"
establishes
technology
based
limits
for
pH
within
the
range
of
6.0
to
9.0.
Considering
that
the
receiving
stream
will
provide
some
buffering
capacity,
effluent
limitation
for
pH
will
be
retained
in
a
range
6.0
to
9.0.
The
sample
type
will
be
grab.

Oxygen
Depleting
Substances
The
data
submitted
with
the
permit
application
indicated
presence
of
high
levels
of
Chemical
Oxygen
Demand
(
COD)
and
Biochemical
Oxygen
Demand,
5­
day
(
BOD5)
in
the
facility's
wastewater
discharges.
The
majority
of
COD
and
BOD5
detected
in
the
facility's
effluent
originates
from
deicing
compounds
handled
at
the
site.
Deicing
compounds
contain
predominantly
propylene
glycol,
blended
with
water,
buffers,
wetting
agents
and
oxidation
inhibitors
(
required
to
prevent
damage
to
aircraft
aluminum
and
sensitive
electronic
systems)
along
with
thickeners
and
other
additives.

Deicing
compounds,
particularly
propylene
glycol,
are
considered
readily
biodegradable.
Consequently,
primary
environmental
impact
of
the
MNAA's
discharges
from
Outfall
002
is
related
to
large
amount
of
oxygen
consumed
by
microorganisms
during
Metro
Nashville
Airport
Authority
(
Rationale)
NPDES
Permit
TN0064041
Page
R­
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of
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28
biodegradation
of
deicing
compounds.
This
wastewater
characteristic
is
commonly
measured
and
expressed
as
a
5­
day
biochemical
oxygen
demand
(
BOD5).
Of
particular
importance
for
the
MNAA
discharges
is
the
fact
that
a
receiving
stream
(
Sims
Branch)
is
on
the
303(
d)
list
for
NOT
supporting
designated
uses
due
to
habitat
alteration,
siltation,
organic
enrichment/
D.
O.,
and
nonpriority
organics.
Recognized
sources
of
pollutants
in
this
segment
of
the
receiving
stream
include,
but
are
not
limited
to:
channelization,
land
development,
and
industrial
storm
water
runoff.

Based
on
a
receiving
stream
tier
determination,
a
great
significance
has
to
be
placed
on
preventing
addition
of
oxygen
depleting
pollutants
into
this
already
impacted
waterbody.
In
the
years
leading
up
to
the
issuance
of
the
current
NPDES
permit,
MNAA
consultants
have
conducted
several
intensive
field
studies
and
developed
models
of
the
receiving
stream
in
order
to
suggest
appropriate
BOD5
limits.
Unfortunately,
the
quality
and
type
of
data
gathered,
and
consequent
modeling
and
proposed
limits,
were
not
deemed
acceptable
and
protective
of
the
receiving
stream.
The
effluent
limitations
proposed
in
the
Draft
NPDES
permit
were
developed
by
the
Division
based
on
desktop
modeling
of
the
receiving
stream.

The
permittee
had
argued
that
the
method
used
to
develop
the
model
the
discharge
and
the
receiving
stream
used
little
corroborative
field
data,
making
it
too
conservative
in
nature,
which
has
resulted
in
overly
stringent
BOD5
effluent
limitations
for
the
MNAA.
In
other
words,
to
be
protective
of
the
receiving
stream,
and
in
the
absence
of
appropriate
field
data,
the
Division
has
used
standard,
conservative
default
model
parameters
in
the
model.
The
permittee
further
argued
that
if
unable
to
remove
sufficient
BOD5
from
the
wastewater
in
the
wastewater
treatment
basin,
the
MNAA
would
be
at
risk
of
violating
discharge
permit
limits
or
be
forced
to
divert
the
discharge
to
the
Nashville
sanitary
sewer
system
and
pay
surcharges.

As
a
result
of
discussions
and
meetings
both
at
the
site
and
at
the
Division's
office
regarding
development
of
appropriate
effluent
limitations,
protective
of
the
receiving
stream,
a
Wasteload
Allocation
(
WLA)
Study
Workplan
for
Sims
Branch
was
proposed
and
subsequently
submitted
on
November
27,
2001.
A
properly
conducted
WLA
and
modeling
study
was
prepared
in
order
to
generate
a
more
accurate
model
of
the
receiving
stream,
and
could
yield
greater
effluent
BOD5
limitations
for
the
MNAA,
while
still
be
protective
of
the
receiving
stream.

The
Division's
Permit
Section
and
Watershed
Management
Section
have
reviewed
the
proposed
WLA
study
and
approved
it
in
its
entirety.
As
described
in
the
study,
the
MNAA
will
initiate
a
wasteload
allocation
and
modeling
study
of
Sims
Branch
in
order
to
develop
alternate
effluent
water
quality
limitations
for
the
BNA
storm
water
treatment
pond
discharge
in
the
period
of
December
2001
through
December
2003.
The
WLA
study
will,
therefore,
become
a
part
of
the
new
permit,
and
is
included
as
Addendum
I.
In
the
meantime,
all
oxygen
depleting
pollutants
(
CBOD5,
NH4­
N
and
D.
O.)
will
be
monitored
on
a
report
only
basis.

Chemical
Oxygen
Demand
(
COD)

Similarly
to
the
previous
permit,
there
will
be
no
effluent
limitations
established
for
COD
in
the
new
permit.
The
new
permit
limits
are
presented
in
tabular
form
in
Appendix
5.
These
tables
reflect
the
concentration
limits,
based
on
the
average
flow
rates
from
the
outfalls,
necessary
to
maintain
the
protection
of
water
quality
in
the
receiving
stream.
Most
of
the
parameters
and
the
corresponding
monitoring
frequencies
were
retained
from
the
previous
permit.
Metro
Nashville
Airport
Authority
(
Rationale)
NPDES
Permit
TN0064041
Page
R­
6
of
R­
28
Total
Suspended
Solids
(
TSS)

Total
Suspended
Solids
is
a
general
indicator
of
the
quality
of
a
wastewater
and
will
be
limited
in
this
permit.
The
State
of
Tennessee
Water
Quality
Standards
for
the
protection
of
Fish
&
Aquatic
Life
[
Chapter
1200­
4­
3­.
03(
3)
(
c)]
state
there
shall
be
no
distinctly
visible
solids,
scum,
foam,
oily
slick,
or
the
formation
of
slimes,
bottom
deposits
or
sludge
banks
of
such
size
or
character
that
may
be
detrimental
to
fish
and
aquatic
life
in
the
receiving
stream.

The
permit
writer's
BPJ
is
that
limit
for
TSS
of
30
mg/
as
a
monthly
average
value
will
be
protective
of
the
water
quality
criteria
in
the
receiving
stream.
Considering
the
seasonal
nature
of
wastewater
collection,
treatment
and
discharge
system,
daily
maximum
effluent
limitation
for
TSS
will
not
be
established
during
this
permit
term,
it
will
be
"
report
only."
The
sample
type
will
be
grab.

Oil
and
Grease
The
Division
has
determined
that
an
oil
and
grease
limitation
is
needed
for
this
facility
because
of
the
potential
of
contamination
from
spills,
leaks
and
other
industrial
activities
present
at
the
site.
The
limit
for
oil
and
grease
is
15
mg/
l
as
a
daily
maximum
concentration.
This
level
can
be
accomplished
where
oil/
water
separators
are
maintained,
kept
clean
and
are
not
overloaded.
There
should
be
less
reliance
upon
the
oil/
water
separator(
s)
and/
or
wastewater
treatment
plant
as
a
solution
and
a
greater
reliance
upon
good
management,
operation
and
housekeeping
practices
to
restrict
pollution.

According
to
the
State
of
Tennessee
Water
Quality
Standards
for
the
protection
of
Fish
&
Aquatic
Life
[
Chapter
1200­
4­
3­.
03(
3)
(
c)],
there
shall
be
no
distinctly
visible
solids,
scum,
foam,
oily
slick,
or
the
formation
of
slimes,
bottom
deposits
or
sludge
banks
of
such
size
or
character
that
may
be
detrimental
to
fish
and
aquatic
life
in
the
receiving
stream.

The
permit
writer
is
selecting
technology
based
limits
for
oil
and
grease
of
15
mg/
L
as
a
daily
maximum
concentration
and
10
mg/
L
as
a
monthly
average
concentration.
In
addition,
the
permit
will
contain
language
prohibiting
visible
floating
scum,
oil
or
other
matter
in
the
wastewater
discharge.
Sample
type
will
be
grab.

The
following
formulas
are
used
to
evaluate
water
quality
protection:

Cm
=
QsCs
+
QwCw
Qs
+
Qw
where:

Cm
=
resulting
in­
stream
concentration
after
mixing
Cw
=
concentration
of
pollutant
in
wastewater
Cs
=
stream
background
concentration
Qw
=
wastewater
flow
Qs
=
stream
low
flow
Metro
Nashville
Airport
Authority
(
Rationale)
NPDES
Permit
TN0064041
Page
R­
7
of
R­
28
to
protect
water
quality:

Cw
 
(
SA)
[
Cm
(
Qs
+
Qw)
­
QsCs]
Qw
where
(
SA)
is
the
percent
"
Stream
Allocation".

Calculations
used
to
evaluate
water
quality
protection
have
been
done
using
a
standardized
worksheet,
titled
"
Water
Quality
Based
Effluent
Calculations."
Division
policy
dictates
the
following
procedures
in
establishing
these
permit
limits:

1.
The
critical
low
flow
values
are
determined
using
USGS
data:

Fish
and
Aquatic
Life
Protection
7Q10
­
Low
flow
under
natural
conditions
1Q10
­
Regulated
low
flow
conditions
Other
than
Fish
and
Aquatic
Life
Protection
30Q2
­
Low
flow
under
natural
conditions
2.
Fish
&
Aquatic
Life
water
quality
criteria
for
certain
Metals
are
developed
through
application
of
hardness
dependent
equations.
These
criteria
are
combined
with
dissolved
fraction
methodologies
in
order
to
formulate
the
final
effluent
concentrations.

3.
For
criteria
that
are
hardness
dependent,
chronic
and
acute
concentrations
are
based
on
a
Hardness
of
50
mg/
L
and
Total
Suspended
Solids
(
TSS)
of
10
mg/
L
unless
STORET
or
Water
Supply
intake
data
substantiate
a
different
value.
Minimum
and
maximum
limits
on
the
hardness
value
used
for
water
quality
calculations
are
25
mg/
L
and
400
mg/
L
respectively.

4.
Background
concentrations
are
determined
from
the
Division
data
base,
results
of
sampling
obtained
from
the
permittee,
and/
or
obtained
from
nearby
stream
sampling
data.
If
this
background
data
is
not
sufficient,
one­
half
of
the
chronic
"
In­
stream
Allowable"
water
quality
criteria
for
fish
and
aquatic
life
is
used.
If
the
measured
background
concentration
is
greater
than
the
chronic
"
In­
stream
Allowable"
water
quality
criteria,
then
the
measured
background
concentration
is
replaced
with
the
chronic
"
In­
stream
Allowable"
water
quality
criteria
for
the
purpose
of
calculating
the
appropriate
effluent
limitation
(
Cw).
Under
these
circumstances,
and
in
the
event
the
"
stream
allocation"
is
less
than
100%,
the
calculated
chronic
effluent
limitation
for
fish
and
aquatic
life
should
be
equal
to
the
chronic
"
In­
stream
Allowable"
water
quality
criteria.
These
guidelines
should
be
strictly
followed
where
the
industrial
source
water
is
not
the
receiving
stream.
Where
the
industrial
source
water
is
the
receiving
stream,
and
the
measured
background
concentration
is
greater
than
the
chronic
"
Instream
Allowable"
water
quality
criteria,
consideration
may
be
given
as
to
the
degree
to
which
the
permittee
should
be
required
to
meet
the
requirements
of
the
water
quality
criteria
in
view
of
the
nature
and
characteristics
of
the
receiving
stream.

Each
worksheet
has
fourteen
(
14)
data
columns,
all
of
which
may
not
be
applicable
to
any
particular
characteristic
constituent
of
the
discharge.
A
description
of
each
column
is
as
follows:

Column
1:
The
"
Stream
Background"
concentrations
of
the
effluent
characteristics.
Metro
Nashville
Airport
Authority
(
Rationale)
NPDES
Permit
TN0064041
Page
R­
8
of
R­
28
Column
2:
The
"
Chronic"
Fish
and
Aquatic
Life
Water
Quality
Criteria.
For
Cadmium,
Copper,
Lead,
Nickel,
and
Zinc,
this
value
represents
the
criteria
for
the
dissolved
form
at
laboratory
conditions.
The
Criteria
Continuous
Concentration
(
CCC)
is
calculated
using
the
equation:

CCC
=
(
exp
{
mC
[
ln
(
stream
hardness)
]
+
bC
}
)
(
CCF)

CCF
=
Chronic
Conversion
Factor
This
equation
and
the
appropriate
coefficients
for
each
metal
are
from
Tennessee
Rule
1200­
4­
3­.
03
and
the
EPA
guidance
contained
in
The
Metals
Translator:
Guidance
For
Calculating
A
Total
Recoverable
Permit
Limit
From
a
Dissolved
Criterion
(
EPA
823­
B­
96­
007,
June
1996).
Values
for
other
metals
are
in
the
total
form
and
are
not
hardness
dependent;
no
chronic
criteria
exists
for
silver.
Published
criteria
are
used
for
non­
metal
parameters.

Column
3:
The
"
Acute"
Fish
and
Aquatic
Life
Water
Quality
Criteria.
For
Cadmium,
Copper,
Lead,
Nickel,
Silver,
and
Zinc,
this
value
represents
the
criteria
for
the
dissolved
form
at
laboratory
conditions.
The
Criteria
Maximum
Concentration
(
CMC)
is
calculated
using
the
equation:

CMC
=
(
exp
{
mA
[
ln
(
stream
hardness)
]
+
bA
}
)
(
ACF)

ACF
=
Acute
Conversion
Factor
This
equation
and
the
appropriate
coefficients
for
each
metal
are
from
Tennessee
Rule
1200­
4­
3­.
03
and
the
EPA
guidance
contained
in
The
Metals
Translator:
Guidance
For
Calculating
A
Total
Recoverable
Permit
Limit
From
a
Dissolved
Criterion
(
EPA
823­
B­
96­
007,
June
1996).
Values
for
other
metals
are
in
the
total
form
and
are
not
hardness
dependent;
no
acute
criteria
exists
for
Total
Chromium.
Published
criteria
are
used
for
non­
metal
parameters.

Column
4:
The
"
Translator"
converts
the
value
for
dissolved
metal
at
laboratory
conditions
(
columns
2
&
3)
to
total
recoverable
metal
at
in­
stream
ambient
conditions
(
columns
5
&
6).
This
factor
is
calculated
using
the
linear
partition
coefficients
found
in
The
Metals
Translator:
Guidance
For
Calculating
A
Total
Recoverable
Permit
Limit
From
a
Dissolved
Criterion
(
EPA
823­
B­
96­
007,
June
1996)
and
the
equation:

Cdiss
1
 
 
=
 
 
 
 
 
 
 
 
 
 
 
 
 
Ctotal
1
+
{
[
Kpo]
[
ss(
1+
a)]
[
10­
6]
}

ss
=
in­
stream
suspended
solids
concentration
[
mg/
l]

Linear
partition
coefficients
for
streams
are
used
for
unregulated
(
7Q10)
receiving
waters,
and
linear
partition
coefficients
for
lakes
are
used
for
regulated
(
1Q10)
receiving
waters.
For
those
parameters
not
in
the
dissolved
form
in
columns
2
&
3
(
and
all
non­
metal
parameters),
a
Translator
of
1
is
used.
Metro
Nashville
Airport
Authority
(
Rationale)
NPDES
Permit
TN0064041
Page
R­
9
of
R­
28
Column
5:
The
"
Chronic"
Fish
and
Aquatic
Life
Water
Quality
Criteria
at
in­
stream
ambient
conditions.
This
criteria
is
calculated
by
dividing
the
value
in
column
2
by
the
value
in
column
4.

Column
6:
The
"
Acute"
Fish
and
Aquatic
Life
Water
Quality
Criteria
at
in­
stream
ambient
conditions.
This
criteria
is
calculated
by
dividing
the
value
in
column
3
by
the
value
in
column
4.

Column
7:
The
"
Chronic"
Calculated
Effluent
Concentration
for
the
protection
of
fish
and
aquatic
life.
This
is
the
Chronic
limit.

Column
8:
The
"
Acute"
Calculated
Effluent
Concentration
for
the
protection
of
fish
and
aquatic
life.
This
is
the
Acute
limit.

Column
9:
The
In­
Stream
Water
Quality
Criteria
for
the
protection
of
Human
Health
associated
with
the
stream
use
classification
of
Organism
Consumption
(
Recreation).

Column
10:
The
In­
Stream
Water
Quality
Criteria
for
the
protection
of
Human
Health
associated
with
the
stream
use
classification
of
Water
and
Organism
Consumption.
These
criteria
are
only
to
be
applied
when
the
stream
use
classification
for
the
receiving
stream
includes
both
"
Recreation"
and
"
Domestic
Water
Supply."

Column
11:
The
In­
Stream
Water
Quality
Criteria
for
the
protection
of
Human
Health
associated
with
the
stream
use
classification
of
Domestic
Water
Supply.

Column
12:
The
Calculated
Effluent
Concentration
associated
with
Organism
Consumption.

Column
13:
The
Calculated
Effluent
Concentration
associated
with
Water
and
Organism
Consumption.

Column
14:
The
Calculated
Effluent
Concentration
associated
with
Domestic
Water
Supply.

NOTE:
The
calculated
chronic
water
quality
effluent
concentrations
from
Column
7
should
be
compared,
individually,
to
the
values
calculated
in
Columns
12,
13,
and
14
in
order
to
determine
the
most
stringent
chronic
permit
limitations.
The
calculated
acute
water
quality
effluent
concentrations
from
Column
8
should
then
be
compared,
individually,
to
values
equal
to
two
(
2)
times
the
values
presented
in
Columns
12,
13,
and
14
in
order
to
determine
the
most
stringent
acute
permit
limitations.
These
water
quality
based
limits
should
then
be
compared
to
any
technology
based
(
CFR
or
Tennessee
"
Rules")
effluent
limitations,
and/
or
any
previous
permit
limitations,
for
final
determination
of
the
permit
limits.
Metro
Nashville
Airport
Authority
(
Rationale)
NPDES
Permit
TN0064041
Page
R­
10
of
R­
28
Outfalls
003
and
004
Outfalls
003
and
004
are
overflows
from
the
South
and
North
Ponds,
respectively.
These
ponds
are
used
to
collect
and
route
deicing
fluids
and
storm
water
runoff
to
the
wastewater
treatment
plant.
In
a
case
of
an
exceptionally
large
storm
event,
overflow
from
the
ponds
is
routed
directly
into
the
receiving
stream.
Outfall
004
is
expected
to
flow
more
frequently
than
Outfall
003
and
will
be
comprised
of
similar
water
quality.
Therefore,
Outfall
004
will
be
considered
representative
for
both
Outfalls
003
and
004.
Parameters
to
be
monitored
on
a
report
only
basis
include
flow,
pH,
CBOD5,
COD,
TSS
and
Oil
and
Grease.

Storm
Water
Outfalls
(
SW1
through
S11)

This
facility
is
one
which
has
storm
water
runoff
associated
with
industrial
activity,
as
defined
in
40
CFR
122.26
(
b)(
14).
Storm
water
runoff
parameters
to
be
monitored
and
reported
were
determined
by
comparing
effluent
limitations
and
monitoring
requirements
from
the
previous
permit,
the
requirements
from
the
Tennessee
Storm
Water
Multi­
Sector
General
Permit
for
Industrial
Activities
(
TMSP),
the
data
submitted
on
Discharge
Monitoring
Report
(
DMR)
forms,
and
the
data
contained
in
the
application
2F
submitted
by
the
Metro
Nashville
Airport
Authority
facility.

There
are
no
effluent
guidelines
for
storm
water
discharges
from
the
Metro
Nashville
Airport
Authority
facility.
The
previous
permit
did
not
have
effluent
limitations
for
the
facility's
storm
water
runoff.
All
parameters
were
monitored
on
a
"
Report"
only
basis.
Similarly,
the
new
permit
will
not
establish
effluent
limitations,
but
will
require
reporting
of
effluent
characteristics
at
storm
water
Outfalls
SW1,
SW2
and
SW7.
Nevertheless,
a
certain
"
cut­
off
concentrations"
will
be
established
for
each
of
the
monitored
parameters.

The
Division
is
not
assigning
limits
for
these
parameters
at
this
time
since
it
is
the
intent
of
the
Division
that
the
permittee
institutes
a
Storm
Water
Pollution
Prevention
Plan
(
SWPPP)
in
order
to
minimize
the
discharge
of
these
pollutants
from
storm
water
outfalls.
It
is
the
opinion
of
the
Division
that
the
best
method
for
dealing
with
potential
pollution
associated
with
storm
water
discharges
from
the
Metro
Nashville
Airport
Authority
facility
is
through
implementation
of
an
aggressive
SWPPP,
coupled
with
discharge
monitoring
to
verify
SWPPP
effectiveness.
Monitoring
of
storm
water
runoff
from
Outfalls
SW1,
SW2
and
SW7
will
be
required
for
Flow,
pH,
Chemical
Oxygen
Demand
(
COD),
Total
Suspended
Solids
(
TSS)
and
Oil
&
Grease
on
semi­
annual
basis.

In
order
to
assist
the
permittee
in
the
evaluation
of
the
effectiveness
of
the
SWPPP,
benchmark
values
developed
for
the
Tennessee
Storm
Water
Multi­
Sector
General
Permit
for
Industrial
Activities
are
provided
herein
for
comparison.
These
benchmark
values
(
cut­
off
concentrations)
were
developed
by
the
EPA
and
the
State
of
Tennessee
and
are
based
on
data
submitted
by
similar
industries
for
the
development
of
the
multi­
sector
general
storm
water
permit.
The
cut­
off
concentrations
are
target
values
and
should
not
be
construed
to
represent
permit
limits.
Metro
Nashville
Airport
Authority
(
Rationale)
NPDES
Permit
TN0064041
Page
R­
11
of
R­
28
Parameters
of
Concern
Cut­
Off
Concentration
[
mg/
L]

pH
(
range)
5.0
­
9.0
COD
120
Total
Suspended
Solids
(
TSS)
200
Oil
&
Grease
15
Note:
Sample
values
are
from
the
Tennessee
Storm
Water
Multi­
Sector
General
Permit
for
Industrial
Activities,
Rationale,
Part
III,
Table
III­
A:
Parameter
Benchmark
Values.

Another
provision
incorporated
in
the
previous
permit
was
a
"
composite"
sample
type
required
for
analysis
of
TSS
and
Oil
and
Grease.
According
to
the
U.
S.
EPA
"
NPDES
Permit
Writer's
Manual"
(
Office
of
Water,
EPA­
883­
B­
96­
003,
December
1996,
Page
123),
"
grab"
samples
should
be
used
when
the
quality
and
flow
of
the
waste
stream
being
sampled
is
not
likely
to
change
over
time.
Generally,
for
storm
water
runoff
samples,
a
grab
sample
is
considered
adequate
for
effluents
from
holding
ponds
or
other
impoundments
with
a
retention
period
of
greater
than
24
hours
(
Instructions
­
EPA
Form
3510­
2F:
Application
for
Permit
to
Discharge
Storm
Water
Associated
with
Industrial
Activity,
Item
VII,
General
Instructions,
Page
I­
3).

Nevertheless,
the
Division
recognizes
that
a
"
first
flush"
sample
would
be
the
most
accurate
representation
of
the
maximum
daily
value
for
various
pollutants
in
the
storm
water
runoff.
Furthermore,
storm
water
sampling
requirements
included
in
the
TMSP
require
analysis
of
grab
samples
collected
within
the
first
30
minutes
(
or
as
soon
thereafter
as
practical,
but
not
to
exceed
one
hour)
of
when
the
runoff
or
snowmelt
begins
discharging.
Therefore,
the
sample
type
for
all
storm
water
runoff
parameters
in
the
new
permit
will
be
changed
from
"
composite"
to
"
grab."
Every
effort
should
be
made
to
collect
a
"
first
flush"
sample
representative
of
the
daily
maximum
values
for
sampled
parameters.

The
new
permit
will
contain
a
Storm
Water
Pollution
Prevention
Plan
(
SWPPP)
developed
to
regulate
storm
water
runoff.
This
SWPPP
is
meant
to
ensure
that
runoff
from
the
facility
site
is
not
a
significant
source
of
pollution
to
the
receiving
stream.
The
discharger
will
develop,
document
and
maintain
the
SWPPP
pursuant
to
the
requirements
as
set
forth
in
the
TMSP,
Sector
S,
"
Storm
water
discharges
from
establishments
and/
or
facilities
including
airports,
air
terminals,
air
carriers,
flying
fields,
and
establishments
engaged
in
servicing
or
maintaining
airports
and/
or
aircraft
(
generally
classified
under
Standard
Industrial
Classification
(
SIC)
code
45)
which
have
vehicle
maintenance
shops,
material
handling
facilities,
equipment
cleaning
operations
or
airport
and/
or
aircraft
deicing/
anti­
icing
operations,"
Part
3,
"
Storm
Water
Pollution
Prevention
Plan
Requirements."
Those
requirements
are
included
in
the
ATTACHMENT
I
of
this
permit.
The
effectiveness
of
this
SWPPP
will
be
investigated
after
the
results
of
the
storm
water
runoff
monitoring
have
been
submitted.
At
that
time,
should
the
results
so
dictate,
the
Division
maintains
the
authority
to
institute
specific
numeric
limitations
for
the
monitored
parameters.

VIII
BIOMONITORING
REQUIREMENTS
The
discharge
of
treated
wastewater
from
Outfall
002
may
contain
several
different
pollutants,
the
combined
effect
of
which
has
a
reasonable
potential
to
be
detrimental
to
fish
and
aquatic
life.
The
Tennessee
Water
Quality
Standards
criteria
stipulates
that
"
The
waters
Metro
Nashville
Airport
Authority
(
Rationale)
NPDES
Permit
TN0064041
Page
R­
12
of
R­
28
shall
not
contain
toxic
substances,
whether
alone
or
in
combination
with
other
substances,
which
will
produce
toxic
conditions...".

Since
the
permittee
discharges
to
a
stream
with
low
critical
flow
conditions,
there
is
a
concern
for
toxicity
effects
of
the
discharge
on
the
receiving
stream
which
is
relatively
unknown.
Biomonitoring
will
provide
information
relative
to
the
toxicity
of
the
discharge.
Calculation
of
toxicity
limits
is
as
follows:

Qs
+
Qw
DF
=
­­­­­­­­­­­­­­­­­­
=
Dilution
Factor
Qw
where
Qw
is
a
wastewater
flow
(
Qw
=
0.2
MGD)
and
Qs
is
a
receiving
stream
low
flow
(
7Q10
0.0
MGD).
Please
refer
to
Appendix
1
for
details
regarding
facility
discharge
and
receiving
stream.
Therefore,

0.0
+
0.2
DF
=
­­­­­­­­­­­­­­­­­­
=
1
0.2
Since
the
calculated
dilution
factor
is
less
than
500:
1,
and
assuming
immediate
and
complete
mixing,
protection
of
the
stream
from
acute
effects
requires:

Protection
of
aquatic
life
from
acute
effects
requires:

100%
LC50
of
the
wastewater
must
be
>
­­­­­­­­­­­­­­­­
=
Lethal
concentration
DF
X
0.3
100%
LC50
of
the
wastewater
must
be
>
­­­­­­­­­­­­­­­­­­­­­­­­­­­
=
333%
(
effectively,
100%)
1.0
X
0.3
therefore,
LC50
>
100
%

Therefore,
WET
testing
will
be
required
on
100%
effluent.
If
toxicity
is
demonstrated
in
any
of
the
effluent
samples
specified
above,
this
will
constitute
a
violation
of
this
permit.
The
toxicity
tests
specified
herein
shall
be
conducted
quarterly
(
1/
Quarter
during
which
deicing
had
occurred)
for
Outfall
002
and
begin
no
later
than
60
days
from
the
effective
date
of
this
permit.
The
details
regarding
biomonitoring
methodology
can
be
found
in
Part
III
of
the
permit.

IX
ANTIDEGRADATION
Tennessee's
Antidegradation
Statement
is
found
in
the
Rules
of
the
Tennessee
Department
of
Environment
and
Conservation,
Chapter
1200­
4­
3­.
06.
This
statement
outlines
the
criteria
for
the
two
types
of
high
quality
waters.
Outstanding
National
Resource
Waters
(
ONRWs),
as
designated
by
the
Water
Quality
Control
Board,
are
commonly
referred
to
as
Tier
3
waters.
Other
high
quality
waters,
as
identified
by
the
Division,
are
commonly
referred
to
as
Metro
Nashville
Airport
Authority
(
Rationale)
NPDES
Permit
TN0064041
Page
R­
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of
R­
28
Tier
2
waters.
Other
surface
waters
not
specifically
identified
and/
or
designated
as
high
quality
are
referred
to
as
Tier
1
waters.
Some
Tier
1
waters
may
be
identified
by
the
Division
as
not
meeting
existing
criteria
and
appear
on
a
list
of
impaired
waters
per
Section
303(
d)
of
the
Clean
Water
Act.

The
Division
has
made
a
stream
tier
determination
of
the
receiving
waters
(
Sims
Branch)
associated
with
the
subject
discharge(
s)
and
has
found
the
receiving
stream
to
be
neither
a
Tier
2
nor
Tier
3
water.
Additionally,
this
water
appears
on
the
303(
d)
list
for
NOT
supporting
designated
uses
due
to
habitat
alteration,
siltation,
organic
enrichment/
D.
O.,
and
nonpriority
organics.
Recognized
sources
of
pollutants
include,
but
are
not
limited
to:
channelization,
land
development,
and
industrial
storm
water
runoff.
The
discharge
from
MNAA's
Outfall
002
may
contain
significant
amounts
of
oxygen
depleting
pollutants.
The
Division,
therefore,
considers
the
potential
for
degradation
to
the
receiving
stream
from
this
discharge
to
be
considerable.
Consequently,
the
number
of
parameters
as
well
as
the
frequency
of
monitoring
will
be
increased
in
order
to
ensure
comprehensive
and
consistent
protection
of
designated
uses
of
Sims
Branch.

X
PERMIT
DURATION
The
proposed
limitations
meet
the
requirements
of
Section
301(
b)(
2)(
A),
(
C),
(
D),
(
E),
and
(
F)
of
the
Clean
Water
Act
as
amended.
It
is
the
intent
of
the
Division
to
organize
the
future
issuance
and
expiration
of
this
particular
permit
such
that
other
permits
located
in
the
same
watershed
and
group
within
the
State
of
Tennessee
will
be
set
for
issuance
and
expiration
at
the
same
time.
In
order
to
meet
the
target
reissuance
date
for
the
Lower
Cumberland
watershed
and
following
the
directives
for
the
Watershed
Management
Program
initiated
in
January,
1996,
the
permit
will
be
issued
for
a
3
year
term.
Metro
Nashville
Airport
Authority
(
Rationale)
NPDES
Permit
TN0064041
Page
R­
14
of
R­
28
APPENDIX
1
FACILITY
DISCHARGES
AND
RECEIVING
WATERS
OUTFALL
002
RECEIVING
STREAM
LONGITUDE
LATITUDE
DISCHARGE
ROUTE
86
º
40'
29"
36
º
08'
18"
Mile
1.8
of
Sims
Branch
to
mile
1.6
of
Mill
Creek
to
mile
194.5
of
the
Cumberland
River
FLOW
DISCHARGE
(
MGD)
SOURCE
0.200
Wastewater
treatment
plant
STREAM
LOW
3Q20
1Q20
7Q10
efflunet:
non­
process
wastewater
FLOW
(
CFS)
0.000
0.000
0.000
(
fueling
and
de­
icing
activities)
and
(
MGD)
0.000
0.000
0.000
contaminated
storm
water
runoff
STREAM
USE
CLASSIFICATIONS
(
WATER
QUALITY)

FISH
RECREATION
IRRIGATION
LW&
W
DOMESTIC
X
X
X
X
INDUSTRIAL
NAVIGATION
0.200
TOTAL
DISCHARGE
OUTFALLS
003
&
004
RECEIVING
STREAM
LONGITUDE
LATITUDE
DISCHARGE
ROUTE
86­
40­
24
36­
08­
10
Miles
1.9
and
2.0
of
Sims
Branch
to
mile
1.6
of
Mill
Creek
to
mile
194.5
of
the
Cumberland
River
FLOW
DISCHARGE
(
MGD)
SOURCE
variable
Overflow:
non­
process
wastewater
STREAM
LOW
3Q20
1Q20
7Q10
(
fueling
and
de­
icing
activities)
and
FLOW
(
CFS)
0.000
0.000
0.000
storm
water
runoff
(
MGD)
0.000
0.000
0.000
STREAM
USE
CLASSIFICATIONS
(
WATER
QUALITY)

FISH
RECREATION
IRRIGATION
LW&
W
DOMESTIC
X
X
X
X
INDUSTRIAL
NAVIGATION
Variable
TOTAL
DISCHARGE
Metro
Nashville
Airport
Authority
(
Rationale)
NPDES
Permit
TN0064041
Page
R­
15
of
R­
28
APPENDIX
1
FACILITY
DISCHARGES
AND
RECEIVING
WATERS
OUTFALL
SW1
RECEIVING
STREAM
LONGITUDE
LATITUDE
DISCHARGE
ROUTE
86­
39­
28
36­
08­
25
Mile
3.5
of
McCrory
Creek
to
Mile
5.8
of
Stones
River
FLOW
DISCHARGE
(
MGD)
SOURCE
3192*
Storm
water
runoff
STREAM
LOW
3Q20
1Q20
7Q10
FLOW
(
CFS)
0.000
0.000
0.000
(
MGD)
0.000
0.000
0.000
*
Total
area
drained
[
acres]
STREAM
USE
CLASSIFICATIONS
(
WATER
QUALITY)

FISH
RECREATION
IRRIGATION
LW&
W
DOMESTIC
X
X
X
X
INDUSTRIAL
NAVIGATION
Variable
TOTAL
DISCHARGE
OUTFALL
SW2
RECEIVING
STREAM
LONGITUDE
LATITUDE
DISCHARGE
ROUTE
86­
40­
38
36­
08­
29
Sims
Branch
to
Mile
1.6
of
Mill
Creek
to
Mile
194.5
of
the
Cumberland
River
FLOW
DISCHARGE
(
MGD)
SOURCE
960*
Storm
water
runoff
STREAM
LOW
3Q20
1Q20
7Q10
FLOW
(
CFS)
0.000
0.000
0.000
(
MGD)
0.000
0.000
0.000
*
Total
area
drained
[
acres]
STREAM
USE
CLASSIFICATIONS
(
WATER
QUALITY)

FISH
RECREATION
IRRIGATION
LW&
W
DOMESTIC
X
X
X
X
INDUSTRIAL
NAVIGATION
0.000
TOTAL
DISCHARGE
Metro
Nashville
Airport
Authority
(
Rationale)
NPDES
Permit
TN0064041
Page
R­
16
of
R­
28
APPENDIX
1
FACILITY
DISCHARGES
AND
RECEIVING
WATERS
OUTFALL
SW3
RECEIVING
STREAM
LONGITUDE
LATITUDE
DISCHARGE
ROUTE
86­
40­
48.3
36­
08­
30.1
Sims
Branch
to
Mile
1.6
of
Mill
Creek
to
Mile
194.5
of
the
Cumberland
River
FLOW
DISCHARGE
(
MGD)
SOURCE
206*
Storm
water
runoff
STREAM
LOW
3Q20
1Q20
7Q10
FLOW
(
CFS)
0.000
0.000
0.000
(
MGD)
0.000
0.000
0.000
*
Total
area
drained
[
acres]
STREAM
USE
CLASSIFICATIONS
(
WATER
QUALITY)

FISH
RECREATION
IRRIGATION
LW&
W
DOMESTIC
X
X
X
X
INDUSTRIAL
NAVIGATION
0.000
TOTAL
DISCHARGE
OUTFALL
SW4
RECEIVING
STREAM
LONGITUDE
LATITUDE
DISCHARGE
ROUTE
86­
41­
05.7
36­
08­
33.1
Sims
Branch
to
Mile
1.6
of
Mill
Creek
to
Mile
194.5
of
the
Cumberland
River
FLOW
DISCHARGE
(
MGD)
SOURCE
12*
Storm
water
runoff
STREAM
LOW
3Q20
1Q20
7Q10
FLOW
(
CFS)
0.000
0.000
0.000
(
MGD)
0.000
0.000
0.000
*
Total
area
drained
[
acres]
STREAM
USE
CLASSIFICATIONS
(
WATER
QUALITY)

FISH
RECREATION
IRRIGATION
LW&
W
DOMESTIC
X
X
X
X
INDUSTRIAL
NAVIGATION
0.000
TOTAL
DISCHARGE
OUTFALL
SW5
RECEIVING
STREAM
LONGITUDE
LATITUDE
DISCHARGE
ROUTE
86­
41­
45.3
36­
08­
33.9
Sims
Branch
to
Mile
1.6
of
Mill
Creek
to
Mile
194.5
of
the
Cumberland
River
FLOW
DISCHARGE
(
MGD)
SOURCE
78*
Storm
water
runoff
STREAM
LOW
3Q20
1Q20
7Q10
FLOW
(
CFS)
0.000
0.000
0.000
(
MGD)
0.000
0.000
0.000
*
Total
area
drained
[
acres]
STREAM
USE
CLASSIFICATIONS
(
WATER
QUALITY)

FISH
RECREATION
IRRIGATION
LW&
W
DOMESTIC
X
X
X
X
INDUSTRIAL
NAVIGATION
0.000
TOTAL
DISCHARGE
Metro
Nashville
Airport
Authority
(
Rationale)
NPDES
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TN0064041
Page
R­
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of
R­
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APPENDIX
1
FACILITY
DISCHARGES
AND
RECEIVING
WATERS
OUTFALL
SW6
RECEIVING
STREAM
LONGITUDE
LATITUDE
DISCHARGE
ROUTE
86­
41­
58.6
36­
08­
28.5
Sims
Branch
to
Mile
1.6
of
Mill
Creek
to
Mile
194.5
of
the
Cumberland
River
FLOW
DISCHARGE
(
MGD)
SOURCE
24*
Storm
water
runoff
STREAM
LOW
3Q20
1Q20
7Q10
FLOW
(
CFS)
0.000
0.000
0.000
(
MGD)
0.000
0.000
0.000
*
Total
area
drained
[
acres]
STREAM
USE
CLASSIFICATIONS
(
WATER
QUALITY)

FISH
RECREATION
IRRIGATION
LW&
W
DOMESTIC
X
X
X
X
INDUSTRIAL
NAVIGATION
0.000
TOTAL
DISCHARGE
OUTFALL
SW7
RECEIVING
STREAM
LONGITUDE
LATITUDE
DISCHARGE
ROUTE
86­
41­
54
36­
08­
10
Unnamed
tributary
to
Mill
Creek
to
Mile
194.5
of
the
Cumberland
River
FLOW
DISCHARGE
(
MGD)
SOURCE
492*
Storm
water
runoff
STREAM
LOW
3Q20
1Q20
7Q10
FLOW
(
CFS)
0.000
0.000
0.000
(
MGD)
0.000
0.000
0.000
*
Total
area
drained
[
acres]
STREAM
USE
CLASSIFICATIONS
(
WATER
QUALITY)

FISH
RECREATION
IRRIGATION
LW&
W
DOMESTIC
X
X
X
X
INDUSTRIAL
NAVIGATION
0.000
TOTAL
DISCHARGE
Metro
Nashville
Airport
Authority
(
Rationale)
NPDES
Permit
TN0064041
Page
R­
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of
R­
28
APPENDIX
1
FACILITY
DISCHARGES
AND
RECEIVING
WATERS
OUTFALL
S10
RECEIVING
STREAM
LONGITUDE
LATITUDE
DISCHARGE
ROUTE
86­
41­
23.4
36­
05­
42.5
Unnamed
tributary
to
Mill
Creek
to
Mile
194.5
of
the
Cumberland
River
FLOW
DISCHARGE
(
MGD)
SOURCE
272*
Storm
water
runoff
STREAM
LOW
3Q20
1Q20
7Q10
FLOW
(
CFS)
0.000
0.000
0.000
(
MGD)
0.000
0.000
0.000
*
Total
area
drained
[
acres]
STREAM
USE
CLASSIFICATIONS
(
WATER
QUALITY)

FISH
RECREATION
IRRIGATION
LW&
W
DOMESTIC
X
X
X
X
INDUSTRIAL
NAVIGATION
0.000
TOTAL
DISCHARGE
OUTFALL
S11
RECEIVING
STREAM
LONGITUDE
LATITUDE
DISCHARGE
ROUTE
86­
41­
18.4
36­
05­
39.4
Unnamed
tributary
to
Mill
Creek
to
Mile
194.5
of
the
Cumberland
River
FLOW
DISCHARGE
(
MGD)
SOURCE
246*
Storm
water
runoff
STREAM
LOW
3Q20
1Q20
7Q10
FLOW
(
CFS)
0.000
0.000
0.000
(
MGD)
0.000
0.000
0.000
*
Total
area
drained
[
acres]
STREAM
USE
CLASSIFICATIONS
(
WATER
QUALITY)

FISH
RECREATION
IRRIGATION
LW&
W
DOMESTIC
X
X
X
X
INDUSTRIAL
NAVIGATION
0.000
TOTAL
DISCHARGE
Metro
Nashville
Airport
Authority
(
Rationale)
NPDES
Permit
TN0064041
Page
R­
19
of
R­
28
APPENDIX
2
PREVIOUS
PERMIT
LIMITS
AND
MONITORING
REQUIREMENTS
PERMIT
LIMITS
OUTFALL
002
Effluent
from
Treatment
Basin
EFFLUENT
LIMITATIONS
MONITORING
MONTHLY
DAILY
REQUIREMENTS
EFFLUENT
AVG.
CONC.
AVG.
AMNT.
MAX.
CONC.
MAX.
AMNT.
MSRMNT.
SAMPLE
CHARACTERISTIC
(
mg/
l)
(
lb/
day)
(
mg/
l)
(
lb/
day)
FRQNCY.
TYPE
FLOW
Report
(
MGD)
*
Report
(
MGD)
*
Continuous
Recorder
pH
**
Report
1/
Month
Grab
CBOD5
­­
­­
Report
­­
1/
Month
Grab
COD
­­
­­
Report
­­
1/
Month
Grab
TSS
­­
­­
Report
­­
1/
Month
Grab
OIL
&
GREASE
­­
­­
Report
­­
1/
Month
Grab
DISSOLVED
OXYGEN**
Report
1/
Month
Grab
TEMPERATURE
Report
effluent
temperature
[
deg.
C]
1/
Month***
Grab
*
Flow
shall
be
reported
in
Million
Gallons
per
Day
(
MGD)

**
Analyses
shall
be
performed
within
15
minutes
following
sample
collection.

***
Report
effluent
temperature
for
the
first
12
months
after
the
effective
date
of
the
permit
modification
only.

Note:
See
Part
III,
Sections
D,
E,
&
F
for
additional
requirements
PERMIT
LIMITS
INTERNAL
MONITORING
POINT
02A
Influent
to
Treatment
Basin
EFFLUENT
LIMITATIONS
MONITORING
MONTHLY
DAILY
REQUIREMENTS
EFFLUENT
AVG.
CONC.
AVG.
AMNT.
MAX.
CONC.
MAX.
AMNT.
MSRMNT.
SAMPLE
CHARACTERISTIC
(
mg/
l)
(
lb/
day)
(
mg/
l)
(
lb/
day)
FRQNCY.
TYPE
FLOW
­­
Report
(
MGD)
*
1/
Month
Instantaneous
pH
**
Report
1/
Month
Grab
CBOD
­­
­­
Report
­­
1/
Month
Grab
TSS
­­
­­
Report
­­
1/
Month
Grab
OIL
&
GREASE
­­
­­
Report
­­
1/
Month
Grab
DISSOLVED
OXYGEN**
Report
1/
Month
Grab
*
Flow
shall
be
reported
in
Million
Gallons
per
Day
(
MGD)

**
Analyses
shall
be
performed
within
15
minutes
following
sample
collection.

Note:
See
Part
III,
Sections
D,
E,
&
F
for
additional
requirements
Metro
Nashville
Airport
Authority
(
Rationale)
NPDES
Permit
TN0064041
Page
R­
20
of
R­
28
APPENDIX
2
PREVIOUS
PERMIT
LIMITS
AND
MONITORING
REQUIREMENTS
PERMIT
LIMITS
OUTFALL
SW1
­
Storm
Water
(
3192
acres)

OUTFALL
SW2
­
Storm
Water
(
960
acres)

OUTFALL
SW3
­
Storm
Water
(
492
acres)

EFFLUENT
LIMITATIONS
MONITORING
MONTHLY
DAILY
REQUIREMENTS
EFFLUENT
AVG.
CONC.
AVG.
AMNT.
MAX.
CONC.
MAX.
AMNT.
MSRMNT.
SAMPLE
CHARACTERISTIC
(
mg/
l)
(
lb/
day)
(
mg/
l)
(
lb/
day)
FRQNCY.
TYPE
***

FLOW
­­
Report
(
MGD)
*
Semi­
annual
Estimate
pH
**
Report
Semi­
annual
Grab****
COD
­­
­­
Report
­­
Semi­
annual
Grab****
TSS
­­
­­
Report
­­
Semi­
annual
Composite*****
OIL
&
GREASE
­­
­­
Report
­­
Semi­
annual
Composite*****

*
An
estimate
of
discharge
flow
shall
be
made
using
on­
site
measurements
of
the
amount
of
rainfall,
duration
of
the
rainfall,
and
the
drainage
area
of
the
outfall.
Flow
shall
be
reported
in
Million
Gallons
per
Day
(
MGD).

**
pH
analyses
shall
be
performed
within
15
minutes
following
sample
collection.

***
Samples
shall
be
collected
within
30
minutes
of
initiation
of
flow
during
a
storm
event
that
is
greater
than
0.25
inches,
and
that
occurs
at
least
72
hours
after
any
previous
storm
event
with
rainfall
of
0.1
inches
or
greater.

****
Grab
samples
shall
be
collected
in
the
first
30
minutes
of
a
storm
event
discharge.

*****
A
composite
sample
shall
consist
of
three
separate
grab
samples
taken
at
equal
intervals(
as
practicable
during
the
storm
event)
that
have
been
recombined
and
then
tested.

Note:
Storm
water
runoff
from
Outfalls
SW1,
SW2,
&
SW7
is
considered
to
be
representative
of
storm
water
runoff
from
Outfalls
SW1
through
SW7
and
SW9
through
S11.
Metro
Nashville
Airport
Authority
(
Rationale)
NPDES
Permit
TN0064041
Page
R­
21
of
R­
28
APPENDIX
3
HISTORICAL
MONITORING
AND
INSPECTION
Parameter
Code
Maximum
Concentration
Minimum
Concentration
Average
Amount
Maximum
Amount
Outfall
002
mg/
L
mg/
L
mg/
L
lb/
day
or
MGD
BOD5
StdDev
268
­­
­­
­­
BOD5
Max
730
­­
­­
­­
BOD5
Average
159
­­
­­
­­
BOD5
Count
8
­­
­­
­­
CBOD5
StdDev
60
­­
­­
­­
CBOD5
Min
1
­­
­­
­­
CBOD5
Max
360
­­
­­
­­
CBOD5
Average
26
­­
­­
­­
CBOD5
Count
57
­­
­­
­­
COD
StdDev
90
0.2
­­
­­
COD
Min
3
8.9
­­
­­
COD
Max
540
9.3
­­
­­
COD
Average
67
9.1
­­
­­
COD
Count
57
57
­­
­­
D.
O.
StdDev
5.8
2.2
­­
­­
D.
O.
Min
10
5
­­
­­
D.
O.
Average
15
9.1722
­­
­­
D.
O.
Count
65
65
­­
­­
Flow
StdDev
­­
­­
0.194
0.431
Flow
Max
­­
­­
1.125
2.137
Flow
Average
­­
­­
0.254
0.606
Flow
Count
­­
­­
65
65
Oil
and
Grease
StdDev
7.3
­­
­­
­­
Oil
and
Grease
Max
39
­­
­­
­­
Oil
and
Grease
Average
6.5
­­
­­
­­
Oil
and
Grease
Count
65
­­
­­
­­
pH
Min
5
6.4
­­
­­
pH
Max
90
9.5
­­
­­
pH
Count
65
65
­­
­­
TSS
StdDev
24.8
­­
­­
­­
TSS
Max
150
­­
­­
­­
TSS
Average
29.2
­­
­­
­­
TSS
Count
65
­­
­­
­­
Metro
Nashville
Airport
Authority
(
Rationale)
NPDES
Permit
TN0064041
Page
R­
22
of
R­
28
APPENDIX
3
HISTORICAL
MONITORING
AND
INSPECTION
Parameter
Code
Average
Concentration
Maximum
Concentration
Minimum
Concentration
Average
Amount
Maximum
Amount
IMP
02A
mg/
L
mg/
L
MGD
MGD
CBOD5
StdDev
­­
651.8
­­
­­
­­
CBOD5
Min
­­
1
­­
­­
­­
CBOD5
Max
­­
3110
­­
­­
­­
CBOD5
Average
­­
257.0
­­
­­
­­
CBOD5
Count
­­
50
­­
­­
­­
D.
O.
StdDev
­­
­­
2.2
­­
­­
D.
O.
Min
­­
­­
0.7
­­
­­
D.
O.
Max
­­
­­
10.7
­­
­­
D.
O.
Average
­­
­­
5.0
­­
­­
D.
O.
Count
­­
­­
57
­­
­­
Flow
StdDev
­­
­­
­­
0.136
0.133
Flow
Min
­­
­­
­­
0.051
0.010
Flow
Max
­­
­­
­­
0.291
0.619
Flow
Average
­­
­­
­­
0.208
0.425
Flow
Count
­­
­­
­­
57
57
Oil
and
Grease
StdDev
­­
57
­­
­­
­­
Oil
and
Grease
Min
­­
1
­­
­­
­­
Oil
and
Grease
Max
­­
410
­­
­­
­­
Oil
and
Grease
Average
­­
14
­­
­­
­­
Oil
and
Grease
Count
­­
57
­­
­­
­­
pH
StdDev
­­
0.41
­­
­­
­­
pH
Min
­­
7.00
­­
­­
­­
pH
Max
­­
9.10
­­
­­
­­
pH
Count
­­
57.00
­­
­­
­­
TSS
StdDev
­­
350.2
­­
­­
­­
TSS
Min
­­
1.0
­­
­­
­­
TSS
Max
­­
2472.0
­­
­­
­­
TSS
Average
­­
71.0
­­
­­
­­
TSS
Count
­­
57.0
­­
­­
­­
Metro
Nashville
Airport
Authority
(
Rationale)
NPDES
Permit
TN0064041
Page
R­
23
of
R­
28
APPENDIX
3
HISTORICAL
MONITORING
AND
INSPECTION
Parameter
Code
Date
Maximum
Maximum
Amount
Outfall
SW1
mg/
L
MGD
COD
10/
31/
1996
23
COD
4/
30/
1997
22
COD
10/
31/
1997
20
COD
4/
30/
1998
20
COD
10/
31/
1998
8
COD
4/
30/
1999
25
COD
10/
31/
1999
<
10
COD
4/
30/
2000
19
COD
10/
31/
2000
7
COD
4/
30/
2001
16
Flow
10/
31/
1996
73.5
Flow
4/
30/
1997
2.6
Flow
10/
31/
1997
0.3
Flow
4/
30/
1998
0.15
Flow
10/
31/
1998
0.13
Flow
4/
30/
1999
0.3
Flow
10/
31/
1999
0.22
Flow
4/
30/
2000
13.5
Flow
10/
31/
2000
0.972
Flow
4/
30/
2001
10.712
Oil
and
Grease
10/
31/
1996
2
Oil
and
Grease
4/
30/
1997
3
Oil
and
Grease
10/
31/
1997
1
Oil
and
Grease
4/
30/
1998
<
1
Oil
and
Grease
10/
31/
1998
<
1
Oil
and
Grease
4/
30/
1999
<
1
Oil
and
Grease
10/
31/
1999
<
5
Oil
and
Grease
4/
30/
2000
6
Oil
and
Grease
10/
31/
2000
<
5
Oil
and
Grease
4/
30/
2001
<
5
pH
10/
31/
1996
6.9
pH
4/
30/
1997
7.8
pH
10/
31/
1997
7.2
pH
4/
30/
1998
8.1
pH
10/
31/
1998
7.6
pH
4/
30/
1999
6.8
pH
10/
31/
1999
7
pH
4/
30/
2000
7.3
pH
10/
31/
2000
7.2
pH
4/
30/
2001
7.7
TSS
10/
31/
1996
30
TSS
4/
30/
1997
2
TSS
10/
31/
1997
11
TSS
4/
30/
1998
1
TSS
10/
31/
1998
7
TSS
4/
30/
1999
6
TSS
10/
31/
1999
3
TSS
4/
30/
2000
21
TSS
10/
31/
2000
3
TSS
4/
30/
2001
9
Metro
Nashville
Airport
Authority
(
Rationale)
NPDES
Permit
TN0064041
Page
R­
24
of
R­
28
Metro
Nashville
Airport
Authority
(
Rationale)
NPDES
Permit
TN0064041
Page
R­
25
of
R­
28
APPENDIX
3
HISTORICAL
MONITORING
AND
INSPECTION
Parameter
Code
Date
Maximum
Concentration
Maximum
Amount
Outfall
SW2
mg/
L
MGD
COD
10/
31/
1996
27
COD
4/
30/
1997
13
COD
10/
31/
1997
23
COD
4/
30/
1998
9.5
COD
10/
31/
1998
15
COD
4/
30/
1999
27
COD
10/
31/
1999
<
10
COD
4/
30/
2000
COD
10/
31/
2000
29
COD
4/
30/
2001
43
Flow
10/
31/
1996
22.1
Flow
4/
30/
1997
0.77
Flow
10/
31/
1997
0.15
Flow
4/
30/
1998
0.05
Flow
10/
31/
1998
0.014
Flow
4/
30/
1999
12.9
Flow
10/
31/
1999
1.08
Flow
4/
30/
2000
Flow
10/
31/
2000
0.656
Flow
4/
30/
2001
5.655
Oil
and
Grease
10/
31/
1996
2
Oil
and
Grease
4/
30/
1997
4
Oil
and
Grease
10/
31/
1997
9
Oil
and
Grease
4/
30/
1998
<
1
Oil
and
Grease
10/
31/
1998
<
1
Oil
and
Grease
4/
30/
1999
<
5
Oil
and
Grease
10/
31/
1999
<
5
Oil
and
Grease
4/
30/
2000
Oil
and
Grease
10/
31/
2000
<
5
Oil
and
Grease
4/
30/
2001
<
5
pH
10/
31/
1996
7.8
pH
4/
30/
1997
7.6
pH
10/
31/
1997
7.1
pH
4/
30/
1998
8
pH
10/
31/
1998
8
pH
4/
30/
1999
7.7
pH
10/
31/
1999
7.9
pH
4/
30/
2000
pH
10/
31/
2000
7.6
pH
4/
30/
2001
7.6
TSS
10/
31/
1996
5
TSS
4/
30/
1997
2
TSS
10/
31/
1997
4
TSS
4/
30/
1998
5
TSS
10/
31/
1998
2
TSS
4/
30/
1999
46
TSS
10/
31/
1999
3
TSS
4/
30/
2000
TSS
10/
31/
2000
10
TSS
4/
30/
2001
6
Metro
Nashville
Airport
Authority
(
Rationale)
NPDES
Permit
TN0064041
Page
R­
26
of
R­
28
Metro
Nashville
Airport
Authority
(
Rationale)
NPDES
Permit
TN0064041
Page
R­
27
of
R­
28
APPENDIX
3
HISTORICAL
MONITORING
AND
INSPECTION
Parameter
Code
Date
Maximum
Concentration
Maximum
Amount
Outfall
SW7
mg/
L
MGD
COD
10/
31/
1996
25
COD
4/
30/
1997
23
COD
10/
31/
1997
20
COD
4/
30/
1998
<
20
COD
10/
31/
1998
COD
4/
30/
1999
<
20
COD
10/
31/
1999
<
10
COD
4/
30/
2000
17
COD
10/
31/
2000
<
5
COD
4/
30/
2001
29
Flow
10/
31/
1996
11.3
Flow
4/
30/
1997
0.0015
Flow
10/
31/
1997
0.05
Flow
4/
30/
1998
0.1
Flow
10/
31/
1998
Flow
4/
30/
1999
0.08
Flow
10/
31/
1999
0
Flow
4/
30/
2000
1.1
Flow
10/
31/
2000
0.323
Flow
4/
30/
2001
0.798
Oil
and
Grease
10/
31/
1996
1
Oil
and
Grease
4/
30/
1997
<
1
Oil
and
Grease
10/
31/
1997
3
Oil
and
Grease
4/
30/
1998
5
Oil
and
Grease
10/
31/
1998
Oil
and
Grease
4/
30/
1999
<
1
Oil
and
Grease
10/
31/
1999
<
5
Oil
and
Grease
4/
30/
2000
<
5
Oil
and
Grease
10/
31/
2000
<
5
Oil
and
Grease
4/
30/
2001
<
5
pH
10/
31/
1996
8.2
pH
4/
30/
1997
7
pH
10/
31/
1997
7.1
pH
4/
30/
1998
7.9
pH
10/
31/
1998
pH
4/
30/
1999
6.5
pH
10/
31/
1999
6.8
pH
4/
30/
2000
7.5
pH
10/
31/
2000
7
pH
4/
30/
2001
7.6
TSS
10/
31/
1996
70
TSS
4/
30/
1997
6
TSS
10/
31/
1997
9
TSS
4/
30/
1998
6
TSS
10/
31/
1998
TSS
4/
30/
1999
5
TSS
10/
31/
1999
30
TSS
4/
30/
2000
13
TSS
10/
31/
2000
22
TSS
4/
30/
2001
9
Metro
Nashville
Airport
Authority
(
Rationale)
NPDES
Permit
TN0064041
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of
R­
28
Metro
Nashville
Airport
Authority
(
Rationale)
NPDES
Permit
TN0064041
Page
R­
29
of
R­
28
APPENDIX
4
NEW
PERMIT
LIMITS
PERMIT
LIMITS
OUTFALL
002
EFFLUENT
LIMITATIONS
MONITORING
MONTHLY
DAILY
REQUIREMENTS
EFFLUENT
AVG.
CONC.
AVG.
AMNT.
MAX.
CONC.
MAX.
AMNT.
MSRMNT.
SAMPLE
CHARACTERISTIC
(
mg/
l)
(
lb/
day)
(
mg/
l)
(
lb/
day)
FRQNCY.
TYPE
FLOW
Report
(
MGD)
*
Report
(
MGD)
*
1/
Week
Instantaneous
pH**
Range
6.0
­
9.0
1/
Week
Grab
COD
­­
­­
Report
­­
1/
Week
Grab
TOTAL
SUSPENDED
SOLIDS
(
TSS)
30.0
­­
Report
­­
1/
Month
Grab
OIL
&
GREASE
10.0
­­
15.0
­­
1/
Month
Grab
DISSOLVED
OXYGEN
(
D.
O.)
Reprt
Minimum
Value
1/
Week
Grab
TEMPERATURE,
Effluent
Report
Effluent
Temperature
1/
Week
Grab
NITROGEN,
AMMONIA
TOTAL
Report
­­
Report
­­
1/
Week
Grab
RECEIVING
STREAM
FLOW
***
1/
Week
Grab
48­
HR
LC50
Survival,
Reproduction,
&
Growth
in
100%
Effluent
****
Composite
*****

CBOD5
Report
­­
Report
­­
1/
Month
Grab
CBOD5
Report
­­
Report
­­
1/
Week
Grab
*
Flow
shall
be
reported
in
Million
Gallons
per
Day
(
MGD).
**
pH
analyses
shall
be
performed
within
fifteen
(
15)
minutes
of
sample
collection.
***
Receiving
stream
flow
is
based
on
a
24­
hour
average
value.
Receiving
stream
flow
will
be
measured
at
a
location,
and
using
methods
approved
by
the
Division.
****
To
be
conducted
once
in
each
quarter
(
Jan­
Mar;
Apr­
Jun;
Jul­
Sep;
Oct­
Dec)
during
which
aircraft
deicing
is/
has
occurred.
*****
See
Part
III
for
methodology.
Report
(
CFS)

Summer
(
May
1
through
September
30)

Winter
(
October
1
through
April
30)
Metro
Nashville
Airport
Authority
(
Rationale)
NPDES
Permit
TN0064041
Page
R­
30
of
R­
28
APPENDIX
4
New
Permit
Limits
PERMIT
LIMITS
OUTFALL
004
EFFLUENT
LIMITATIONS
MONITORING
MONTHLY
DAILY
REQUIREMENTS
EFFLUENT
AVG.
CONC.
AVG.
AMNT.
MAX.
CONC.
MAX.
AMNT.
MSRMNT.
SAMPLE
CHARACTERISTIC
(
mg/
l)
(
lb/
day)
(
mg/
l)
(
lb/
day)
FRQNCY.
***
TYPE
FLOW
Report
(
MGD)
*
Report
(
MGD)
*
1/
Month
Estimate
pH**
Report
1/
Month
Grab
CBOD5
­­
­­
Report
­­
1/
Month
Grab
COD
­­
­­
Report
­­
1/
Month
Grab
TOTAL
SUSPENDED
SOLIDS
(
TSS)
­­
­­
Report
­­
1/
Month
Grab
OIL
&
GREASE
­­
­­
Report
­­
1/
Month
Grab
*
Flow
shall
be
reported
in
Million
Gallons
per
Day
(
MGD).
**
pH
analyses
shall
be
performed
within
fifteen
(
15)
minutes
of
sample
collection.
***
Once
per
month,
or
once
per
occurrence,
whicever
is
less
frequent.
Metro
Nashville
Airport
Authority
(
Rationale)
NPDES
Permit
TN0064041
Page
R­
31
of
R­
28
APPENDIX
4
New
Permit
Limits
VMJ
TN0064041.
doc
PERMIT
LIMITS
EFFLUENT
LIMITATIONS
MONITORING
MONTHLY
DAILY
REQUIREMENTS
EFFLUENT
AVG.
CONC.
AVG.
AMNT.
MAX.
CONC.
MAX.
AMNT.
MSRMNT.
SAMPLE
CHARACTERISTIC
(
mg/
l)
(
lb/
day)
(
mg/
l)
(
lb/
day)
FRQNCY.
TYPE
***

FLOW
Report
(
MGD)
*
Report
(
MGD)
*
Semi­
annual
Estimate
pH
**
Report
Semi­
annual
Grab
CBOD5
­­
­­
Report
­­
Semi­
annual
Grab
COD
­­
­­
Report
­­
Semi­
annual
Grab
TOTAL
SUSPENDED
SOLIDS
(
TSS)
­­
­­
Report
­­
Semi­
annual
Grab
OIL
&
GREASE
­­
­­
Report
­­
Semi­
annual
Grab
*

**
pH
analyses
shall
be
performed
within
fifteen
(
15)
minutes
of
sample
collection.

***
OUTFALL
SW1
­
Storm
Water
(
3,192
acres)
OUTFALL
SW2
­
Storm
Water
(
960
acres)
OUTFALL
SW7
­
Storm
Water
(
492
acres)

The
permittee
shall
provide
the
date
and
duration
(
in
hours)
of
the
qualifying
storm
event(
s)
sampled;
rainfall
measurements
or
estimates
(
in
inches)
of
the
storm
event
that
generated
the
sampled
runoff;
the
duration
between
the
storm
event
sampled
and
the
end
of
the
previous
measurable
(
greater
than
0.1
inch
rainfall)
storm
event;
and
an
estimate
of
the
total
volume
of
the
discharge
sampled.
Flow
shall
be
reported
in
Million
Gallons
per
Day
(
MGD).

Samples
shall
be
collected
within
30
minutes
of
initiation
of
flow
during
a
storm
event
that
is
greater
than
0.1
inches,
and
that
occurs
at
least
72
hours
after
any
previous
storm
event
with
rainfall
of
0.1
inches
or
greater.

Note:
Storm
water
runoff
from
Outfalls
SW1,
SW2,
&
SW7
is
considered
to
be
representative
of
storm
water
runoff
from
Outfalls
SW1
through
S11.
