Memorandum
To:
304(
m)
Record
From:
Tom
Born
Office
of
Water,
Office
of
Science
and
Technology,
Engineering
and
Analysis
Division
(
EAD)

Subject:
303(
d)
Impaired
Waters
Analysis:
Waters
that
may
be
Impaired
because
of
Industrial
Point
Sources
The
purpose
of
this
memorandum
is
to
summarize
the
analysis
that
I
conducted
of
six
pollutants
that
were
identified
by
the
states
as
reasons
for
303(
d)
impairments.
These
six
pollutants
were
selected
by
EAD
from
the
193
some
reasons
for
impairment
because
they
are
most
likely
discharged
from
point
sources
rather
than
contained
in
stormwater
discharges
or
non­
point
source
runoff.

The
six
pollutants
include:
chromium,
nickel,
antimony,
beryllium,
selenium,
and
PCBs.
EAD
determined
that
these
six
pollutants
are
commonly
released
from
point
sources
based
on
the
August
1998
"
Urban
Storm
Water
Best
Management
Practices
Study"
which
characterized
common
point
and
non­
point
source
toxic
pollutants.

The
attached
Excel
Workbook
file
"
Priority
Impairments
for
304(
m)
Point
Sources
Summary
Table
9­
4­
03"
shows
the
number
of
PCS
facilities
by
SIC
on
waterbodies
impaired
because
of
the
six
pollutants.
SIC
4952
"
Sewerage
Systems"
has
the
most
number
of
facilities
on
waterbodies
impaired
for
the
six
pollutants,
followed
by
SIC
8731
"
Commercial
Physical
Research,"
SIC
5541
"
Gasoline
Service
Stations,"
SIC
4911
"
Electrical
Services,"
SIC
2911
"
Petroleum
Refining,"
SIC
5171
"
Petroleum
Bulk
Stations
and
Terminals,"
and
SIC
2844
"
Perfumes,
Cosmetics,
Toilet
Prep."

(
See
attached
file:
Priority
Impairments
for
304(
m)
Point
Sources
Summary
Table
9­
4­
03.
xls)

The
attached
Excel
Workbook
file
"
Priority
Impairments
for
304(
m)
Point
Source
Analysis
8­
21­
03"
was
use
to
compile
the
facility
count
summary
data.
It
contains
a
separate
Excel
Worksheet
for
each
of
the
six
pollutants.
Each
worksheet
contains
five
columns:
the
four­
digit
SIC
code,
the
facility
NPDES
ID,
the
facility
name,
an
indication
whether
the
facility
is
a
major
facility,
and
the
name
of
the
impaired
waterbody
to
which
the
facility
discharges.

(
See
attached
file:
Priority
Impairments
for
304(
m)
Point
Source
Analysis
8­
21­
03.
xls)
