NPL­
U36­
2­
9­
R8
HRS
Documentation
Record
04/
20/
01
Eureka
Mills
UT0002240158
HRS
DOCUMENTATION
RECORD
COVER
SHEET
Name
of
Site:
Eureka
Mills
EPA
ID
No.
UT0002240158
Contact
Persons
Site
Investigation:
Al
Lange
(303)
312­
6987
On­
Scene
Coordinator
U.
S.
Environmental
Protection
Agency,
Region
VIII
999
18th
Street,
Suite
500,
Mail
Code:
8EPR­
ER
Denver,
Colorado
80202­
2405
Documentation
Record:
David
Williams
(303)
312­
6757
NPL
Coordinator
U.
S.
Environmental
Protection
Agency,
Region
VIII
999
18th
Street,
Suite
500,
Mail
Code:
8EPR­
ER
Denver,
Colorado
80202­
2405
Pathways,
Components,
or
Threats
Not
Scored
Ground
Water
Migration
Pathway
The
Eureka
Mills
study
area
is
sparsely
populated,
with
most
individuals
receiving
their
drinking
water
from
upgradient
municipal
wells
that
are
nearly
two
miles
from
town.
The
effects
of
the
surficial
soil
contamination
on
area
ground
water
were
not
evaluated.
Based
on
the
lack
of
data
and
a
limited
number
of
targets,
the
Ground
Water
Migration
pathway
has
not
been
scored
as
part
of
this
Hazard
Ranking
System
(HRS)
package.

Surface
Water
Migration
Pathway
There
are
no
lakes,
reservoirs,
or
wetlands
within
15
downstream
miles
of
the
site.
Eureka
Gulch,
which
drains
the
Eureka
area,
is
an
intermittent
stream.
The
Surface
Water
Migration
pathway
has
not
been
scored
as
part
of
this
HRS
package.

Air
Migration
Pathway
There
are
insufficient
data
to
satisfy
HRS
requirements
for
establishing
an
observed
release
of
hazardous
substances
to
the
air
in
the
Eureka
Mills
study
area.
The
Air
Migration
pathway
has
not
been
scored
as
part
of
this
HRS
package.

Nearby
Population
Threat
The
nearby
population
threat
was
not
scored
because
almost
all
of
the
residents
and
students
in
the
Eureka
area
live
within
the
area
of
observed
contamination.
There
are
insufficient
residents
and
students
living
outside
of
the
observed
area
of
contamination
to
significantly
affect
the
site
score.
HRS
Documentation
Record
04/
20/
01
Eureka
Mills
UT0002240158
1
HRS
DOCUMENTATION
RECORD
Name
of
Site:
Eureka
Mills
EPA
Region:
Region
VIII
Date
Prepared:
April
20,
2001
Street
Address
of
Site:
Intersection
of
U.
S.
Highway
6
and
Shriver
St.

City,
County,
State:
Eureka,
Juab
County,
Utah
General
Location
in
the
State:
The
Eureka
Mills
site
is
located
in
Eureka,
approximately
55
miles
southsouthwest
of
Salt
Lake
City,
in
the
north­
central
portion
of
the
state.

Topographic
Map:
Eureka,
Utah,
7.5
minute
quadrangle
(Ref.
3).

Latitude:
39
o
57
'
20.0
"
North
Longitude:
112
o
06
'
56.0
"
West
(Ref.
4)

The
reference
point
for
this
calculation
is
the
center
of
the
intersection
of
U.
S.
Highway
6
and
Shriver
Street
in
Eureka,
Utah.

Scores
Air
Pathway
0.
00
Ground
Water
Pathway
0.
00
Soil
Exposure
Pathway
100.00
Surface
Water
Pathway
0.
00
HRS
SITE
SCORE
50.00
HRS
Documentation
Record
04/
20/
01
Eureka
Mills
UT0002240158
2
WORKSHEET
FOR
COMPUTING
HRS
SITE
SCORE
S
S
2
1.
Ground
Water
Migration
Pathway
Score
(Sgw)
N
S
(from
Table
3­
1,
line
13)

2a.
Surface
Water
Overland/
Flood
Migration
Component
NS
(from
Table
4­
1,
line
30)

2b.
Ground
Water
to
Surface
Water
Migration
Component
NS
(from
Table
4­
25,
line
28)

2c.
Surface
Water
Migration
Pathway
Score
(Ssw)
N
S
Enter
the
larger
of
lines
2a
and
2b
as
the
pathway
score.

3.
Soil
Exposure
Pathway
Score
(Ss)
100
10,000
(from
Table
5­
1,
line
22)

4.
Air
Migration
Pathway
Score
(Sa)
N
S
(from
Table
6­
1,
line
12)

5.
Total
of
Sgw
2
+
Ssw
2
+
Ss
2
+
Sa
2
10,000
6.
HRS
Site
Score
Divide
the
value
on
line
5
by
4
and
take
the
square
root
50.00
NS
­
Not
Scored
a
Maximum
value
applies
to
waste
characteristics
category.
b
Maximum
value
not
applicable.
c
No
specific
maximum
value
applies
to
factor.
However,
pathway
score
based
solely
on
terrestrial
sensitive
environments
is
limited
to
maximum
of
60.
d
Do
not
round
to
nearest
integer.
NS­
Not
Scored
HRS
documentation
Record
04/
20/
01
Eureka
Mills
UT0002240158
3
TABLE
5­
1
SOIL
EXPOSURE
PATHWAY
SCORE
SHEET
Factor
Categories
and
Factors
Maximum
Value
Value
Assigned
RESIDENT
POPULATION
THREAT
Likelihood
of
Exposure
1.
Likelihood
of
Exposure
550
550
Waste
Characteristics
2.
Toxicity
a
10,000
3.
Hazardous
Waste
Quantity
a
100
4.
Waste
Characteristics
100
32
Targets
5.
Resident
Individual
50
50
6.
Resident
Population
6a.
Level
I
Concentrations
b
4455
6b.
Level
II
Concentrations
b
527.5
6c.
Resident
Population
(lines
6a
+
6b)
b
4982.5
7.
Workers
15
5
8.
Resources
5
0
9.
Terrestrial
Sensitive
Environments
c
0
10.
Targets
(lines
5
+
6c
+
7
+
8
+
9)
b
5032.5
Resident
Population
Threat
Score
11.
Resident
Population
Threat
(lines
1
x
4
x
10)
b
88,660,000
a
Maximum
value
applies
to
waste
characteristics
category.
b
Maximum
value
not
applicable.
c
No
specific
maximum
value
applies
to
factor.
However,
pathway
score
based
solely
on
terrestrial
sensitive
environments
is
limited
to
maximum
of
60.
d
Do
not
round
to
nearest
integer.
NS­
Not
Scored
HRS
documentation
Record
04/
20/
01
Eureka
Mills
UT0002240158
4
TABLE
5­
1
SOIL
EXPOSURE
PATHWAY
SCORE
SHEET
(continued)

Factor
Categories
and
Factors
Maximum
Value
Value
Assigned
NEARBY
POPULATION
THREAT
Likelihood
of
Exposure
12.
Attractiveness/
Accessibility
100
0
13.
Area
of
Contamination
100
0
14.
Likelihood
of
Exposure
500
NS
Waste
Characteristics
15.
Toxicity
a
0
16.
Hazardous
Waste
Quantity
a
0
17.
Waste
Characteristics
100
NS
Targets
18.
Nearby
Individual
1
0
19.
Population
Within
1
Mile
b
0
20.
Targets
(lines
18
+
19)
b
NS
Nearby
Population
Threat
Score
21.
Nearby
Population
Threat
(lines
14
x
17
x
20)
b
NS
SOIL
EXPOSURE
PATHWAY
SCORE
Soil
Exposure
Pathway
Score
d
22.
(Ss),
(lines
[11
+
21]
÷
82,500
subject
to
a
maximum
of
100)
100
100
HRS
Documentation
Record
04/
20/
01
Eureka
Mills
UT0002240158
5
REFERENCES
Ref.
No.
Description
of
the
Reference
1.
U.
S.
Environmental
Protection
Agency
(EPA),
[Office
of
the
Federal
Register
National
Archives
and
Records
Administration
(OFRNARA)],
December
14,
1990,
40
CFR
Part
300,
Hazard
Ranking
System
(HRS).

2.
U.
S.
Environmental
Protection
Agency
(EPA).
1996.
Superfund
Chemical
Data
Matrix.
June
1996.
1
page,
excerpt.

3.
U.
S.
Geological
Survey
(USGS).
1992.
7.5­
minute
Series
Topographic
Quadrangle
Map
of
Eureka,
Utah,
1992.
1:
24,000
scale.
1
map
(modified).

4.
U.
S.
Environmental
Protection
Agency
(EPA).
Latitude
and
Longitude
Calculation
Worksheet.
1
page.

5.
Utah
Department
of
Environmental
Quality
(UDEQ).
2000.
Preliminary
Assessment
of
the
Eureka
Mills,
Tony
Howes,
Division
of
Environmental
Response
and
Remediation.
15
pages,
plus
figures
and
appendices.

6.
Utah
Department
of
Environmental
Quality
(UDEQ).
2000.
Site
Inspection
of
the
Eureka
Mills,
Tony
Howes,
Division
of
Environmental
Response
and
Remediation.
29
pages
plus
appendices.

7.
Utah
Department
of
Environmental
Quality
(UDEQ).
2000.
Site
Inspection
Work
Plan,
Eureka
Mills,
Tony
Howes,
Division
of
Environmental
Response
and
Remediation.
15
pages
plus
appendices.

8.
U.
S.
Department
of
Commerce,
Bureau
of
the
Census.
1990.
Census
of
Population
and
Housing,
Population
and
Housing
Unit
Counts,
Utah.
2
pages,
excerpt.

9.
Butler,
B.
S.,
G.
F.
Loughlin,
and
V.
C.
Heikes.
1920.
The
Ore
Deposits
of
Utah.
U.
S.
Geological
Survey
Professional
Paper
111.
22
pages,
excerpt.

10.
U.
S.
Department
of
the
Interior,
Geological
Survey.
1899.
Nineteenth
Annual
Report,
Part
IIIEconomic
Geology.
Washington,
Government
Printing
Office.
5
pages,
excerpt.

11.
U.
S.
Department
of
the
Interior,
Geological
Survey.
1919.
Geology
and
Ore
Deposits
of
the
Tintic
Mining
District,
Utah.
Professional
Paper
107.
14
pages,
excerpt.

12.
Notarianni,
P.
F.
1982.
Faith,
Hope,
Prosperity­
The
Tintic
Mining
District:
Eureka,
Utah,
Tintic
Historical
Society.
190
pages.

13.
U.
S.
Department
of
the
Interior,
Bureau
of
Mines.
1935.
Lead
and
Zinc
Mining
and
Milling
in
the
United
States
Current
Practices
and
Costs.
Bulletin
381.
Washington,
Government
Printing
Office.
5
pages,
excerpt.

14.
URS
Operating
Services,
Inc.
(UOS).
2001.
Removal
Preliminary
Assessment
Report,
Eureka
Mills,
Eureka,
Utah.
TDD
No.
0009­
0015.
March
26,
2001.
182
pages
plus
appendices.
HRS
Documentation
Record
04/
20/
01
Eureka
Mills
UT0002240158
6
15.
URS
Operating
Services,
Inc.
(UOS).
2001.
Removal
Preliminary
Assessment
Report,
Eureka
Mills
Outside.
TDD
No.
0010­
0011.
January
22,
2001.
55
pages
plus
appendices.

16.
URS
Operating
Services,
Inc.
(UOS).
2001.
GIS
Map
depicting
Areas
of
Observed
Arsenic
and
Lead
Contamination
based
on
laboratory
analytical
results
from
the
Eureka
Mills
Investigation.
1
sheet.

17.
Shacklette,
Hansford
T.,
and
Josephine
G.
Boerngen.
1984.
Element
Concentrations
in
Soils
and
Other
Surficial
Materials
of
the
Conterminous
United
States.
U.
S.
Geological
Survey
Professional
Paper
1270.
105
pages,
excerpt.

18.
Utah
Department
of
Environmental
Quality,
DERR
(UDEQ).
Various
dates.
Inorganic
Background
Soil
Data,
Salt
Lake
City
Area,
Compiled
From
APA
Site
Inspections.
140
pages.

19.
Office
of
Solid
Waste
and
Emergency
Response
(OSWER).
1996.
Directive
9285.7­
14FS,
Using
Qualified
Data
To
Document
An
Observed
Release
and
Observed
Contamination,
November
1996.
18
pages.

20.
American
West
Analytical
Laboratories.
2001.
Facsimile
showing
table
of
Method
Detection
Limits
from
American
West
Analytical
Laboratories,
March
14,
2001.
1
page.

21.
Sentinel,
Inc.
2001.
Facsimile
of
Form
10
showing
Instrument
Detection
Limits
taken
from
the
data
validation
report
for
TDD
No.
75­
00605
for
the
Eureka
Mine
project.
1
page.

22.
URS
Operating
Services,
Inc.
(UOS).
2000.
Telephone
Interview
Record
from
conversation
between
Barry
Hayhurst,
UOS
and
Eileen
Schow,
Tintic
High
School,
discussing
number
of
students
and
employees
at
Tintic
High
School.
1
page.

23.
U.
S.
Department
of
the
Interior.
Bureau
of
Reclamation
(BOR).
2001.
Discretionary
Depth
Sample
Location
Maps.
199
maps.

24.
URS
Operating
Services,
Inc.
(UOS).
2000.
Memorandum
from
Henry
Schmelzer,
UOS
to
Jeff
Miller,
UOS
discussing
the
location
of
Eureka
soil
sample
E525EMD18Y53
at
the
Tintic
High
School.
1
page.

25.
URS
Operating
Services,
Inc.
(UOS).
2000.
Telephone
Interview
Record
from
conversation
between
Lara
Harshfield,
UOS
and
Peggy
Snell,
Tintic
School
District,
discussing
number
of
students
and
employees
at
Eureka
Elementary
School.
1
page.
HRS
Documentation
Record
04/
20/
01
Eureka
Mills
UT0002240158
7
2.1
SITE
SUMMARY
The
Eureka
Mills
site
is
approximately
150
acres
of
arsenic
and
lead
contaminated
soil
located
in
the
town
of
Eureka,
approximately
60
miles
south
of
Salt
Lake
City
and
12
miles
west
of
Utah
Lake.
Eureka
is
one
of
several
towns
in
the
Tintic
Mining
District,
which
was
organized
in
the
spring
of
1870.
Richer
ores
from
the
district
were
shipped
to
larger
smelters
both
in
the
U.
S.
and
abroad.
It
was
not
economical
to
ship
the
lower
grade
ores,
so
milling
and
smelting
operations
were
developed
near
the
mines.
A
total
of
14
mills
may
have
been
operated
in
the
Tintic
District.
These
mills
concentrated
ores
to
make
them
more
profitable
for
shipping.
Early
mills
in
Eureka
used
the
mercury
amalgamation
process,
where
ore
was
crushed
into
a
pulp,
run
over
vanners,
and
collected
as
amalgam
in
tanks
and
pans.
A
number
of
smelters
have
also
operated
in
the
Tintic
District
over
the
years.
However,
none
were
very
successful
nor
operated
for
any
substantial
length
of
time
(Ref.
11,
pp.
114,
115).

The
Utah
Department
of
Environmental
Quality
(UDEQ),
in
conjunction
with
the
U.
S.
Environmental
Protection
Agency
(EPA)
collected
22
soil
and
9
sediment
samples
from
the
Eureka
area
in
2000.
Soil
samples
were
collected
from
residential
areas,
from
the
Tintic
High
School
and
Eureka
Elementary
Schools,
and
from
adjacent
to
mill
sites.
Sediment
samples
were
collected
along
Eureka
Gulch
and
in
the
gulch
below
four
of
the
possible
mill
sites
in
Eureka.
These
samples
were
analyzed
for
total
metals
and
indicated
the
presence
of
arsenic
and
lead
concentrations
as
great
as
1,030
milligrams
per
kilogram
(mg/
kg)
and
29,300
mg/
kg,
respectively.

The
discovery
of
these
concentrations
prompted
the
U.
S.
Environmental
Protection
Agency
(EPA)
to
begin
a
Removal
Evaluation
in
August
2000.
It
included
the
collection
of
4,205
surface
soil
samples,
which
were
analyzed
using
X­
Ray
Fluorescence
(XRF).
Of
these
4,
205
samples,
394
were
sent
to
an
EPA
contractor
laboratory
for
confirmational
analysis.
Of
these
394
confirmation
samples,
225
were
discrete
depth
samples
taken
from
between
0
and
18
inches
bgs.
All
confirmation
samples
were
analyzed
for
total
metals
and
confirmed
the
presence
of
arsenic
and
lead
in
surface
soils
up
to
2,100
mg/
kg
and
37,000
J
mg/
kg,
respectively.
When
compared
to
site
background
levels
of
14.7
ppm
for
arsenic
and
198
ppm
for
lead,
the
results
of
the
laboratory
confirmation
samples
were
utilized
to
delineate
an
area
of
more
than
6
million
square
feet
of
surficial
arsenic
and
lead
soil
contamination.

The
methods
of
migration
for
the
contamination
are
various.
Historical
flooding
has
occurred,
which
may
have
transported
mine
and
mill
wastes
downgradient
toward
and
through
the
town.
Human
actions
have
also
probably
served
to
spread
contamination
around
the
town
of
Eureka.
In
1900,
tailings
ponds
overflowed
and
flooded
Eureka
Gulch.
Wastes
from
one
milling
process
were
allowed
to
flow
downhill
and
into
Eureka
Gulch.
The
use
of
mine
and
mill
waste
as
fill
material
around
the
town
appears
to
have
been
widespread.
Horse
teams
and
wagons
hauled
most
of
the
district's
ore
in
its
early
days.
It
is
likely
that
some
primary
ore
carried
in
this
manner
was
inadvertently
lost
during
transportation.
Aerial
deposition
from
blowing
dust,
and
to
a
lesser
extent
from
smelting,
is
also
a
potential
mode
of
contaminant
transportation.

An
evaluation
of
the
confirmation
data
from
within
the
area
of
observed
soil
contamination
indicates
there
are
approximately
90
residences,
as
well
as
two
schools,
that
are
subject
to
Level
1
contamination.
HRS
Documentation
Record
04/
20/
01
Eureka
Mills
UT0002240158
8
2.2
SOURCE
CHARACTERIZATION
2.2.1
SOURCE
IDENTIFICATION
Name
of
Source:
Lead
and
Arsenic
Contaminated
Soil
Number
of
source:
1
Source
Type:
Contaminated
Surface
Soils
Description
of
Source:

The
UDEQ,
in
conjunction
with
the
EPA
Superfund
Technical
Assessment
and
Response
Team
(START)
collected
22
soil
and
9
sediment
samples
from
the
Eureka
area
in
2000
(Ref.
6,
p.
1).
Soil
samples
were
collected
from
residential
areas,
from
the
Tintic
High
School
and
Eureka
Elementary
Schools,
and
adjacent
to
mill
sites.
These
samples
were
analyzed
for
Target
Analyte
List
(TAL)
total
metals
and
indicated
the
presence
of
arsenic
and
lead
concentrations
as
great
as
1,030
mg/
kg
(sample
MHET76)
and
29,300
mg/
kg
(sample
MHET76),
respectively
(Ref.
6,
Fig.
4,
Table
3,
page
3,
App.
F,
p.
95).
The
analytical
methods
used
by
the
lab
were
EPA
Contract
Laboratory
Program
(CLP)
analysis
for
Metals
and
Mercury
EPA
SW­
846
Method
6010B
(inductively
coupled
plasma
(ICP))
for
arsenic
and
lead
(Refs.
6,
p.
1,
App.
E.;
21).
Other
total
metal
analytes
that
were
recorded
in
soils
at
levels
greater
than
three
times
background
included
calcium,
zinc,
cadmium,
silver,
copper,
mercury,
antimony,
thallium,
selenium,
sodium,
manganese,
and
magnesium
(Reference
6,
p.
20­
23).

The
discovery
of
these
concentrations
prompted
EPA
to
begin
a
Removal
Evaluation
to
determine
the
extent
of
arsenic
and
lead
present
in
soils
in
this
region
of
Juab
County.
The
Removal
Evaluation
was
begun
in
August
2000
by
Bureau
of
Reclamation
(BOR)
and
EPA
START
contractors.
It
included
the
collection
of
approximately
4,205
surface
soil
samples
(collected
from
less
than
eighteen
inches
below
ground
surface
(bgs))
from
accessible
properties
in
Eureka
(Ref.
14,
p.
1).
Larger
properties
were
subdivided
into
zones
consisting
of
yards,
lots,
driveways,
gardens,
play
areas,
or
other
subdivided
areas
within
a
property
address
(Ref.
14,
p.
10).
Each
property
address
could
have
more
than
one
zone.
At
each
zone,
two
surface
composite
samples
consisting
of
five
aliquots
each
were
collected,
along
with
three
discrete
depth
samples
taken
from
0
to
6
inches,
6
to
12
inches,
and
12
to
18
inches
bgs
respectively.
All
samples
were
analyzed
by
the
BOR
using
X­
ray
fluorescence
(XRF).
Of
these
4,205
samples,
394
were
sent
to
an
EPA
contractor
laboratory
for
confirmational
analysis
(Ref.
14,
Table
8).
Of
these
394
confirmation
samples,
225
were
discrete
depth
samples
taken
from
between
0
and
18
inches
bgs
(Ref.
14,
Table
8).
The
analytical
methods
used
by
the
lab
were
EPA
SW­
846
Method
7060A
(graphite
furnace
atomic
absorbtion
(GFAA))
for
arsenic
and
EPA
SW846
Method
6010B
(ICP)
for
lead
(Refs.
14,
p.
20,
App.
D;
20).

When
compared
to
area
background
levels,
the
results
of
the
laboratory
confirmation
samples
were
utilized
to
delineate
an
area
of
6,608,997.26
square
feet
of
surficial
arsenic
and
lead
soil
contamination
(Refs.
14;
16).
The
methods
of
migration
for
the
contamination
are
various.
Historical
flooding
has
occurred,
which
may
have
transported
mine
and
mill
wastes
downgradient
toward
and
through
the
town
(Refs.
5,
pp.
9,
10;
12,
pp.
68,
69).
Human
actions
have
also
probably
served
to
spread
contamination
around
the
town
of
Eureka.
In
1900,
tailings
ponds
at
the
Eureka
Hill
Mill
broke
and
flooded
Eureka
Gulch
(Ref.
5,
p.
5).
Wastes
from
the
Chief
Mill
milling
process
were
allowed
to
flow
downhill
and
into
Eureka
Gulch
(Ref.
5,
p.
7).
The
use
of
mine
and
mill
waste
as
fill
material
around
the
town
appears
to
have
been
widespread
(Ref.
6,
pp.
13,
14,
15,
18).
Horse
teams
and
wagons
hauled
most
of
the
district's
ore
in
its
early
days
(Ref.
12,
p.
37).
It
is
likely
that
some
primary
ore
carried
in
this
manner
was
inadvertently
lost
during
transportation.
Aerial
deposition
HRS
Documentation
Record
04/
20/
01
Eureka
Mills
UT0002240158
9
from
blowing
dust,
and
to
a
lesser
extent
from
smelting,
is
also
a
potential
mode
of
contaminant
transportation
(Ref.
6,
p.
25).

Location
of
the
source,
with
reference
to
a
map
of
the
site:

The
area
of
contaminated
soils
covers
most
of
the
town
of
Eureka
(Ref.
16).

2.2.2
HAZARDOUS
SUBSTANCES
ASSOCIATED
WITH
THE
SOURCE
(CONTAMINATED
SOIL)

Hazardous
Substance
Evidence
References
Station
Location
m
Laboratory
Sample
m
Arsenic
329
West
Dublin(
2,100
mg/
kg)
E329DUD06Y02
Ref.
14,
Table
8,
p.
155,
App.
D,
p.
252
Lead
043
South
Highway
6
(37,000
J
mg/
kg)
E043HWD12Y
Ref.
14,
Table
8,
p.
146,
App.
D,
pp.
633,
634,
664
Source
Sample
Information/
Association
The
soil
samples
listed
above
were
collected
during
the
2000
Eureka
Mills
sampling
effort
conducted
by
the
BOR
and
EPA
START.
Analytical
results
from
soil
samples
submitted
to
the
laboratory
indicate
the
presence
of
arsenic
concentrations
in
surface
soils
(0
to
18
inches
bgs)
ranging
from
46
mg/
kg
(lowest
concentration
for
establishing
significance
above
background)
to
a
maximum
of
2,100
mg/
kg,
and
lead
concentrations
up
to
37,000
J
mg/
kg
(Refs.
14,
Table
8,
pp.
146,
155;
App.
D.,
pp.
252,
600,
664).
This
area
of
contamination
is
delineated
based
on
a
comparison
of
confirmation
sample
results
to
the
background
arsenic
concentration
of
14.7
mg/
kg
and
background
lead
concentration
of
198
J
mg/
kg
collected
during
the
Site
Investigation
(SI)
sampling
event
(Ref.
6,
App
F.,
pp.
74,
101).

Sample
locations
of
contaminated
soil
showing
significantly
elevated
concentrations
are
displayed
on
the
GIS
map
that
is
Reference
16.
Coordinates
were
derived
by
the
BOR.
These
coordinates,
in
conjunction
with
the
laboratory
analytical
data,
were
utilized
to
calculate
the
area
of
contaminated
soil.

2.2.4
HAZARDOUS
WASTE
QUANTITY
2.4.2.1.1
Hazardous
Constituent
Quantity
(Not
Evaluated
(NE),
insufficient
data)

Hazardous
Constituent
Quantity
Assigned
Value:
NE
2.4.2.1.2
Hazardous
Wastestream
Quantity
Hazardous
Wastestream
Quantity
Assigned
Value:
NE
2.4.2.1.3
Volume
Assigned
Volume
Value:
0
2.4.2.1.4
Area
HRS
Documentation
Record
04/
20/
01
Eureka
Mills
UT0002240158
10
Description
Surface
soil
samples
indicate
the
presence
of
arsenic
and
lead
at
levels
significantly
above
background
as
defined
in
the
HRS
Table
2­
3
(Ref.
1).
A
total
of
162
samples
met
the
criteria
for
observed
contamination.
This
includes
95
Level
I
arsenic
samples
and
26
Level
II
lead
samples
in
which
significant
concentrations
above
background
were
detected
on
properties
within
200
feet
of
a
residence
(or
school).
The
area
of
surface
soil
contamination
covers
an
expanse
of
6,608,997.26
square
feet
(Ref.
16).
Using
ArcInfo
GIS
software
(Version
3.2),
this
area
was
determined
by
plotting
surveyed
sample
points
from
samples
that
had
concentrations
of
arsenic
and
lead
significantly
above
background
over
a
base
map
of
the
city
provided
to
UOS
by
the
BOR.
Samples
plotted
around
the
perimeter
of
the
town
were
then
connected
in
a
conservative
manner
to
document
the
area
of
observed
contamination.

The
assigned
area
value
is
listed
in
Section
2.4.2
and
Table
2­
5
of
the
HRS
(Ref.
1):

6,608,997.26/
34,000
=
194.38
Assigned
Area
Value:
194.38
SUMMARY
OF
SOURCE
DESCRIPTIONS
Source
No.
Source
Hazardous
Waste
Quantity
Value
Source
Hazardous
Constituent
Quantity
Complete?
(Y/
N)
Available
to
Pathway
(X)

Groundwater
(GW)
Surface
Water
(SW)
Air
Overland/
Flood
GW
to
SW
Gas
Particulate
1
194.38
N
NS
NS
NS
NS
NS
Total
194.38
NS
­
Not
Scored
2.4.2.2
Hazardous
Waste
Quantity
Factor
Value
According
to
Table
2­
6
in
the
HRS,
based
on
a
source
hazardous
waste
quantity
value
of
194.38,
the
hazardous
waste
quantity
factor
value
is
100
(Ref.
1,
Table
2­
6,
p.
51592)

Hazardous
Waste
Quantity
Factor
Value:
100
HRS
Documentation
Record
04/
20/
01
Eureka
Mills
UT0002240158
11
5.0
SOIL
EXPOSURE
PATHWAY
5.0.1
GENERAL
CONSIDERATIONS
Observed
contamination
samples
were
selected
from
the
Eureka
Mills
confirmation
sample
database
for
laboratory
verified
concentrations
of
lead
and
arsenic,
as
well
as
sample
ID,
street
address,
and
the
date
each
sample
was
collected.
Sample
IDs
are
comprised
of
seven
fields.
The
first
field
is
"E"
for
Eureka,
the
second
field
is
a
three
digit
house
number,
the
third
field
is
comprised
of
two
letters
that
represent
street
names,
the
fourth
field
is
a
sample
type
descriptor
(e.
g.,
"D"
means
discrete
depth
sample),
the
fifth
field
is
the
sample
depth
(e.
g.,
06
means
the
sample
was
taken
from
2
to
6
inches),
the
sixth
field
represents
the
sample
zone
type
(e.
g.,
"Y"
means
the
sample
was
taken
from
a
yard),
and
the
seventh
field
(if
present)
represents
the
property
zone
from
which
the
sample
was
taken
if
more
than
one
zone
was
present
(Ref.
14,
pp.
1,
16,17,
18,
19).
For
this
documentation
record,
only
discrete
depth
samples
were
used
to
document
observed
contamination
(Ref.
14,
Table
8,
App.
D).
Surface
composite
samples
were
not
used
because
each
aliquot
of
the
composite
was
not
surveyed
and
its
location
could
not
be
reproduced
precisely
for
future
sampling
events.
Of
the
discrete
depth
samples,
only
samples
that
were
located
within
200
linear
feet
of
a
residence,
and
within
the
property
boundaries
of
that
residence,
were
used
to
document
Level
I
contamination.
Samples
that
were
used
to
document
Level
II
contamination
were
all
collected
from
locations
meeting
the
observed
contamination
requirements
(inside
the
observed
contamination
delineated
area)
that
were
not
used
to
document
Level
I
locations.
In
addition
to
the
samples
discussed
above,
three
additional
observed
contamination
samples
from
SI
sampling
(MHET68,
MHET70,
and
MHET73)
are
included.
These
samples
were
also
taken
from
within
200
feet
of
residences
(Ref.
6,
pp.
14,
18,
19).

The
property
boundaries
on
the
GIS
map
were
generated
using
BOR
survey
data
that
were
collected
based
on
professional
judgement,
field
observations
(such
as
existing
fence
lines),
discussions
with
property
owners,
and
Eureka
City
Survey
plat
maps
gathered
from
the
Juab
County
Recorders
Office
(Ref.
16).
Survey
plats
were
then
generated
for
each
residence.
Reference
23
contains
these
survey
plats
for
each
residential
property
on
which
a
sample
documenting
observed
contamination
was
taken.
This
information
was
keyed
by
ground
control
survey
(base
map
provided
to
UOS
by
the
BOR)
to
GIS
mapping
software
(ArcInfo)
by
UOS
to
produce
the
GIS
map
that
is
Reference
16.

From
a
total
of
247
discrete
depth
soil
samples
that
were
sent
for
laboratory
confirmation
(225
sent
by
BOR
and
22
sent
by
UDEQ),
95
exhibited
arsenic
contamination
at
levels
meeting
the
criteria
for
significance
above
background
(Level
I),
and
26
met
the
requirements
for
significance
above
background
regarding
lead
(Level
II).
These
numbers
do
not
include
multiple
discrete
samples
collected
from
single
addresses.
Only
the
samples
with
the
highest
recorded
concentrations
from
such
properties
were
used
on
the
GIS
map
(Ref.
16).
In
addition
to
these
Level
I
and
Level
II
target
samples,
41
other
samples
documented
an
observed
release
but
were
not
taken
from
within
200
feet
of
a
residence.
These
samples
are
also
shown
on
the
GIS
map
(Ref.
16).

Name
of
area:
Contaminated
Soils
Location
and
description
of
area
(with
reference
to
a
map
of
the
site):
One
area
of
contaminated
soil
has
been
delineated
in
the
Eureka
area.
The
area
trends
northeast
to
southwest
and
is
approximately
bounded
by
Arlington
Street
to
the
north,
Tintic
High
School
to
the
east,
Beck
Street
to
the
south,
and
Last
Chance
Street
and
Highway
6
to
the
west
(Ref.
16).
HRS
Documentation
Record
04/
20/
01
Eureka
Mills
UT0002240158
12
­
Background
Concentrations:

In
2000,
the
UDEQ,
in
conjunction
with
EPA
START,
collected
samples
believed
to
be
representative
of
local
background
conditions,
due
to
their
location
outside
of
the
apparent
area
of
contaminant
deposition
and
proximity
to
the
Eureka
Mills
site
(Ref.
6).
Two
of
these
samples
MHET82
and
MHEW12
were
chosen
for
comparison
because
they
contained
the
highest
concentrations
detected
for
lead
and
arsenic.
Arsenic
was
detected
in
MHEW12
at
14.7
mg/
kg
while
lead
was
detected
in
MHET82
at
198
J
mg/
kg
(Ref.
6,
pp.
74,
101)
(see
table
below).
For
comparison,
Shacklette
(1984)
has
shown
arsenic
and
lead
concentrations
in
the
Western
United
States
to
be
lower
(5.5
mg/
kg
and
17
mg/
kg
respectively)
than
those
used
in
this
package
(Ref.
17,
p.
6).
In
addition,
UDEQ
has
compiled
a
table
of
inorganic
background
soil
values
for
the
Salt
Lake
City
area
that
shows
a
comparable
mean
value
for
arsenic
at
14.
90
mg/
kg
and
a
lower
mean
value
for
lead
at
127.51
mg/
kg
(Ref.
18,
p.
320004).
The
following
table
summarizes
the
two
UDEQ
SI
samples
that
were
used
for
background
comparison:

Sample
ID
Date
Hazardous
Substance
Concentration
(mg/
kg)
Sample
Quantitation
Limit
(SQL)*
(mg/
kg)
Reference
MHET82
7/
06/
00
Lead
198
J
0.
6
Ref.
6,
App.
F,
p.
82,
101
MHEW12
7/
11/
00
Arsenic
14.7
2.
09
Ref.
6,
App.
F,
p.
74
*
For
CLP
analysis,
estimated
Sample
Quantitation
Limits
(SQLs)
are
calculated
from
Contract
Required
Detection
Limits
(CRDLs)
supplied
by
EPA
Contractor
Laboratory
(Ref.
21)
using
the
following
formula
(assuming
a
final
volume
of
200
milliliters
and
a
sample
weight
of
1
gram):

CRDL
(ug/
L)
x
200
ml
x
1,000
ug/
mg
x
dilution
1,000
ml/
L
x
1
g
x
1,000
g/
kg
x
(%
solids/
100)

Contaminated
Samples
HRS
Documentation
Record
04/
20/
01
Eureka
Mills
UT0002240158
13
­
Level
I
Contaminated
Samples
Surface
Soil,
<
18
inches
bgs,
all
samples
show
concentration
of
arsenic
greater
than
the
benchmark
of
0.43
mg/
kg
Cancer
Risk
Screening
Concentration
(Ref.
2,
p.
B­
65).

Sample
ID
(address)
Date
Concentration
of
arsenic
(mg/
kg)
MDL*
(mg/
kg)
Reference
Value
Conversion*

E006WMD12Y
(6
W.
Main)
11/
4/
00
330
­
0.
2
Refs.
14,
Table
8,
p.
145,
App.
D.,
p.
549;
23,
p.
7
E011RRD06Y
(11
W.
Railroad)
9/
13/
00
64
­
0.
2
Refs.
14,
Table
8,
p.
145,
App.
D.,
p.
154;
23,
p.
8
E015CHD12Y
(15
N.
Church)
10/
30/
00
190
­
0.
2
Refs.
14,
Table
8,
p.
145,
App.
D.,
p.
441;
23,
p.
11
E015EMD06Y
(15
E.
Main)
10/
16/
00
110
­
0.
2
Refs.
14,
Table
8,
p.
145,
App.
D.,
p.
359;
23,
p.
10
E020WAD12Y01
(20
W.
Arlington)
10/
3/
00
1,200
­
0.
2
Refs.
14,
Table
8,
p.
145,
App.
D.,
p.
595;
23,
p.
14
E022SHD06Y
(22
Shriver)
10/
24/
00
550
­
0.
2
Refs.
14,
Table
8,
p.
145,
App.
D.,
p.
596;
23,
p.
16
E025EHD06Y01
(25
E.
Hannifin)
9/
22/
00
510
­
0.
2
Refs.
14,
Table
8,
p.
145,
App.
D.,
p.
248;
23,
p.
17
E028SHD06Y
(28
Shriver)
11/
14/
00
190
­
0.
2
Refs.
14,
Table
8,
p.
146,
App.
D.,
p.
557;
23,
p.
20
E029SHD18Y
(29
Shriver)
11/
18/
00
170
­
0.
2
Refs.
14,
Table
8,
p.
146,
App.
D.,
p.
568;
23,
p.
22
E030CRD12L02
(30
W.
Carlson)
10/
16/
00
170
­
0.
2
Refs.
14,
Table
8,
p.
146,
App.
D.,
p.
361;
23,
p.
24
E030WAD06A03
(30
W.
Arlington)
10/
03/
00
190
­
0.
2
Refs.
14,
Table
8,
p.
146,
App.
D.,
p.
367;
23,
p.
25
Sample
ID
(address)
Date
Concentration
of
arsenic
(mg/
kg)
MDL*
(mg/
kg)
Reference
Value
Conversion*

HRS
Documentation
Record
04/
20/
01
Eureka
Mills
UT0002240158
14
E031CED06L01
(31
N.
Center)
10/
16/
00
100
­
0.
2
Refs.
14,
Table
8,
p.
146,
App.
D.,
p.
360;
23,
p.
27
E037EMD12Y
(37
E.
Main)
9/
12/
00
96
­
0.
2
Refs.
14,
Table
8,
p.
146,
App.
D.,
p.
172;
23,
p.
32
E038HAD06Y02
(38
S.
Haulage)
11/
13/
00
54
­
0.
2
Refs.
14,
Table
8,
p.
146,
App.
D.,
p.
617;
23,
p.
33
E040CED12Y
(40
N.
Center)
10/
13/
00
140
­
0.
2
Refs.
14,
Table
8,
p.
146,
App.
D.,
p.
357;
23,
p.
34
E040SRD12L03
(40
N.
Spring)
10/
26/
00
130
­
0.
2
Refs.
14,
Table
8,
p.
146,
App.
D.,
p.
451;
23,
p.
36
E040WMD12Y
(40
W.
Main)
11/
18/
00
310
­
0.
2
Refs.
14,
Table
8,
p.
146,
App.
D.,
p.
564;
23,
p.
35
E041WLD06Y
(41
W.
Leadville)
9/
14/
00
98
­
0.
2
Refs.
14,
Table
8,
p.
146,
App.
D.,
p.
175;
23,
p.
37
E043HWD12Y
(43
S.
Hwy
36)
11/
27/
00
1,700
­
0.
2
Refs.
14,
Table
8,
p.
146,
App.
D.,
p.
664;
23,
p.
38
E045CHD06Y01
(45
N.
Church)
9/
11/
00
61
­
0.
2
Refs.
14,
Table
8,
p.
146,
App.
D.,
p.
134;
23,
p.
39
E045SHD06Y
(45
Shriver)
10/
20/
00
960
­
0.
2
Refs.
14,
Table
8,
p.
146,
App.
D.,
p.
450;
23,
p.
40
E046CHD12Y01
(46
N.
Church)
9/
8/
00
480
­
0.
2
Refs.
14,
Table
8,
p.
146,
App.
D.,
p.
592;
23,
p.
43
E046WLD18Y
(46
W.
Leadville)
11/
11/
00
56
­
0.
2
Refs.
14,
Table
8,
p.
146,
App.
D.,
p.
611;
23,
p.
42
Sample
ID
(address)
Date
Concentration
of
arsenic
(mg/
kg)
MDL*
(mg/
kg)
Reference
Value
Conversion*

HRS
Documentation
Record
04/
20/
01
Eureka
Mills
UT0002240158
15
E048WMD06Y
(48
W.
Main)
11/
1/
00
53
­
0.
2
Refs.
14,
Table
8,
p.
146,
App.
D.,
p.
506;
23,
p.
44
E054CFD06Y01
(54
Chief)
11/
4/
00
150
­
0.
2
Refs.
14,
Table
8,
p.
147,
App.
D.,
p.
547;
23,
p.
48
E055EMD06Y13
(55
E.
Main
(Elementary
School))
9/
18/
00
130
J
­
0.2
Refs.
14,
Table
8,
p.
147,
App.
D.,
pp.
198,
212;
23,
p.
49
E056BED06Y01
(56
S.
Beck)
9/
19/
00
310
­
0.
2
Refs.
14,
Table
8,
p.
147,
App.
D.,
p.
213;
23,
p.
50
E056HAD06Y01
(56
S.
Haulage)
9/
21/
00
440
J
­
0.2
Refs.
14,
Table
8,
p.
147,
App.
D.,
pp.
224,
225,
264;
23,
p.
51
E060BRD18Y
(60
S.
Bray)
9/
27/
00
79
J
­
0.2
Refs.
14,
Table
8,
p.
147,
App.
D.,
pp.
274,
316;
23,
p.
52
E063WMD06Y03
(63
W.
Main)
9/
27/
00
640
­
0.
2
Refs.
14,
Table
8,
p.
147,
App.
D.,
p.
294;
23,
p.
53
E064WJD06Y
(64
W.
Jones)
11/
16/
00
170
­
0.
2
Refs.
14,
Table
8,
p.
147,
App.
D.,
p.
559;
23,
p.
55
E072BRD06Y
(72
S.
Bray)
9/
27/
00
120
­
0.
2
Refs.
14,
Table
8,
p.
148,
App.
D.,
p.
287;
23,
p.
63
E072WLD06Y
(72
W.
Leadville)
9/
14/
00
73
­
0.
2
Refs.
14,
Table
8,
p.
148,
App.
D.,
p.
178;
23,
p.
64
E073NSD06Y
(73
N.
Sharp)
11/
10/
00
85
­
0.
2
Refs.
14,
Table
8,
p.
148,
App.
D.,
p.
610;
23,
p.
65
E073WLD06Y
(73
W.
Leadville)
9/
14/
00
77
­
0.
2
Refs.
14,
Table
8,
p.
148,
App.
D.,
p.
177;
23,
p.
66
Sample
ID
(address)
Date
Concentration
of
arsenic
(mg/
kg)
MDL*
(mg/
kg)
Reference
Value
Conversion*

HRS
Documentation
Record
04/
20/
01
Eureka
Mills
UT0002240158
16
E075NHD06Y
(75
N.
Hatfield)
8/
26/
00
130
­
0.
2
Refs.
14,
Table
8,
p.
148,
App.
D.,
p.
126;
23,
p.
67
E079RID06Y
(79
W.
Richens)
10/
12/
00
350
­
0.
2
Refs.
14,
Table
8,
p.
148,
App.
D.,
p.
353;
23,
p.
69
E081CED12Y
(81
N.
Center)
10/
2/
00
730
­
0.
2
Refs.
14,
Table
8,
p.
148,
App.
D.,
p.
365;
23,
p.
71
E083ELD06Y01
(83
E.
Leadville)
9/
5/
00
750
­
0.
2
Refs.
14,
Table
8,
p.
148,
App.
D.,
p.
185;
23,
p.
72
E087TED06Y01
(87
N.
Terrace)
9/
7/
00
110
­
0.
2
Refs.
14,
Table
8,
p.
148,
App.
D.,
p.
590;
23,
p.
73
E089CHD06Y
(89
N.
Church)
11/
18/
00
130
­
0.
2
Refs.
14,
Table
8,
p.
148,
App.
D.,
p.
563;
23,
p.
75
E089JAD06Y
(89
Jarvis)
10/
4/
00
96
­
0.
2
Refs.
14,
Table
8,
p.
148,
App.
D.,
p.
345;
23,
p.
74
E094WMD06Y
(94
W.
Main)
11/
18/
00
59
­
0.
2
Refs.
14,
Table
8,
p.
149,
App.
D.,
p.
565;
23,
p.
77
E098CHD18Y01
(98
N.
Church)
9/
8/
00
350
­
0.
2
Refs.
14,
Table
8,
p.
149,
App.
D.,
p.
593;
23,
p.
79
E100TED06Y
(100
N.
Terrace)
11/
10/
00
84
­
0.
2
Refs.
14,
Table
8,
p.
149,
App.
D.,
p.
521;
23,
p.
82
E101WLD12Y
(101
W.
Leadville)
9/
12/
00
87
­
0.
2
Refs.
14,
Table
8,
p.
149,
App.
D.,
p.
141;
23,
p.
84
E102WMD06Y
(102
W.
Main)
11/
4/
00
63
­
0.
2
Refs.
14,
Table
8,
p.
149,
App.
D.,
p.
552;
23,
p.
86
Sample
ID
(address)
Date
Concentration
of
arsenic
(mg/
kg)
MDL*
(mg/
kg)
Reference
Value
Conversion*

HRS
Documentation
Record
04/
20/
01
Eureka
Mills
UT0002240158
17
E118WMD06Y
(118
W.
Main)
11/
2/
00
46
­
0.
2
Refs.
14,
Table
8,
p.
150,
App.
D.,
p.
600;
23,
p.
90
E119WMD06Y
(119
W.
Main)
11/
21/
00
66
­
0.
2
Refs.
14,
Table
8,
p.
150,
App.
D.,
p.
643;
23,
p.
91
E124TED06Y
(124
N.
Terrace)
11/
10/
00
170
­
0.
2
Refs.
14,
Table
8,
p.
150,
App.
D.,
p.
608;
23,
p.
94
EM­
SD­
42
(MHET70)
(125
E.
Main)
7/
05/
00
197
­
2.
03**
Ref.
6,
p.
14,
App.
F,
p.
62
E127RRD12L02
(127
West
Railroad)
10/
17/
00
46
­
0.
2
Refs.
14,
Table
8,
p.
150,
App.
D.,
p.
387;
23,
p.
96
E128TED06Y
(128
N.
Terrace)
11/
10/
00
54
­
0.
2
Refs.
14,
Table
8,
p.
150,
App.
D.,
p.
607;
23,
p.
98
E130STD12Y
(130
W.
Stack)
10/
12/
00
50
­
0.
2
Refs.
14,
Table
8,
p.
150,
App.
D.,
p.
354;
23,
p.
99
E134RRD18Y
(134
W.
Railroad)
10/
19/
00
78
J
­
0.2
Refs.
14,
Table
8,
p.
150,
App.
D.,
pp.
376,
377,
399;
23,
p.
103
EM­
SO­
28
(MHET68)
(136
E.
Main)
7/
05/
00
220
­
2.
16**
Ref.
6,
p.
18,
App.
F,
p.
60,
106
E162WMD06Y01
(162
W.
Main)
11/
4/
00
69
­
0.
2
Refs.
14,
Table
8,
p.
151,
App.
D.,
p.
553;
23,
p.
116
E163HWD06D01
(163
S.
Hwy
36)
11/
27/
00
240
­
0.
2
Refs.
14,
Table
8,
p.
151,
App.
D.,
p.
668;
23,
p.
117
E164RRD06Y
(164
W.
Railroad)
11/
1/
00
210
­
0.
2
Refs.
14,
Table
8,
p.
151,
App.
D.,
p.
599;
23,
p.
118
Sample
ID
(address)
Date
Concentration
of
arsenic
(mg/
kg)
MDL*
(mg/
kg)
Reference
Value
Conversion*

HRS
Documentation
Record
04/
20/
01
Eureka
Mills
UT0002240158
18
E169WLD12Y
(169
W.
Leadville)
9/
25/
00
99
­
0.
2
Refs.
14,
Table
8,
p.
151,
App.
D.,
p.
303;
23,
p.
119
E181LLD06Y
(181
Iliff)
11/
24/
00
110
­
0.
2
Refs.
14,
Table
8,
p.
152,
App.
D.,
p.
655;
23,
p.
124
E187IOD06Y
(187
W.
Iron
&
O'Conner)
10/
24/
00
110
J
63
0.
2
Refs.
14,
Table
8,
p.
152,
App.
D.,
pp.
376,
377,
379,
380,
405;
23,
p.
127
E193HAD06Y
(193
S.
Haulage)
11/
16/
00
170
­
0.
2
Refs.
14,
Table
8,
p.
152,
App.
D.,
p.
560;
23,
p.
128
E195DED06D01
(195
W.
Deprizin)
11/
8/
00
140
­
0.
2
Refs.
14,
Table
8,
p.
152,
App.
D.,
p.
606;
23,
p.
129
E197CHD12P02
(197
N.
Church)
9/
8/
00
380
­
0.
2
Refs.
14,
Table
8,
p.
152,
App.
D.,
p.
594;
23,
p.
130
E200EAD12Y02
(200
E.
Arlington)
9/
22/
00
1,600
­
0.
2
Refs.
14,
Table
8,
p.
152,
App.
D.,
p.
238;
23,
p.
132
E202WMD06Y01
(202
W.
Main)
11/
2/
00
840
­
0.
2
Refs.
14,
Table
8,
p.
153,
App.
D.,
p.
601;
23,
p.
135
E208ELD12Y01
(208
E.
Leadville)
9/
5/
00
320
J
184
0.2
Refs.
14,
Table
8,
p.
153,
App.
D.,
pp.
41,
42,
59;
23,
p.
136
E210WAD12Y01
(210
W.
Arlington)
10/
28/
00
60
­
0.
2
Refs.
14,
Table
8,
p.
153,
App.
D.,
p.
597;
23,
p.
136A
E221ELD06G01
(221
E.
Leadville)
9/
6/
00
150
J
86
0.
2
Refs.
14,
Table
8,
p.
153,
App.
D.,
p.
41,
42,
60;
23,
p.
141
E224NLD12Y01
(224
W.
N.
Leadville)
9/
21/
00
70
J
­
0.2
Refs.
14,
Table
8,
p.
153,
App.
D.,
pp.
224,
225,
261;
23,
p.
143
Sample
ID
(address)
Date
Concentration
of
arsenic
(mg/
kg)
MDL*
(mg/
kg)
Reference
Value
Conversion*

HRS
Documentation
Record
04/
20/
01
Eureka
Mills
UT0002240158
19
E230DED12L02
(230
W.
Deprizen)
11/
08/
00
530
J
305
0.2
Refs.
14,
Table
8,
p.
153,
App.
D.,
pp.
464,
487;
23,
p.
145
E241WMD06Y02
(241
W.
Main)
11/
2/
00
790
­
0.
2
Refs.
14,
Table
8,
p.
153,
App.
D.,
p.
512;
23,
p.
148
E248WMD06Y
(248
W.
Main)
11/
2/
00
80
­
0.
2
Refs.
14,
Table
8,
p.
154,
App.
D.,
p.
513;
23,
p.
153
E260ELD06Y
(260
E.
Leadville)
9/
7/
00
150
­
0.
2
Refs.
14,
Table
8,
p.
154,
App.
D.,
p.
591;
23,
p.
155
E273WLD12Y
(273
W.
Leadville)
11/
4/
00
90
­
0.
2
Refs.
14,
Table
8,
p.
154,
App.
D.,
p.
548;
23,
p.
159
E280WMD18Y
(280
W.
Main)
11/
2/
00
57
­
0.
2
Refs.
14,
Table
8,
p.
154,
App.
D.,
p.
603;
23,
p.
163
E284EMD06L03
(284
E.
Main)
11/
27/
00
48
­
0.
2
Refs.
14,
Table
8,
p.
154,
App.
D.,
p.
670;
23,
p.
166
E284WMD06D
(284
W.
Main)
11/
11/
00
1,300
­
0.
2
Refs.
14,
Table
8,
p.
154,
App.
D.,
p.
613;
23,
p.
165
E286WLD12Y
(286
W.
Leadville)
9/
20/
00
76
J
­
0.2
Refs.
14,
Table
8,
p.
155,
App.
D.,
pp.
224,
225,
260;
23,
p.
168
E291WMD06Y
(291
W.
Main)
11/
6/
00
46
­
0.
2
Refs.
14,
Table
8,
p.
155,
App.
D.,
p.
555;
23,
p.
170
E293EMD12Y
(293
E.
Main)
11/
18/
00
49
­
0.
2
Refs.
14,
Table
8,
p.
155,
App.
D.,
p.
570;
23,
p.
171
E295DUD06Y
(295
W.
Dublin)
11/
17/
00
78
­
0.
2
Refs.
14,
Table
8,
p.
155,
App.
D.,
p.
562;
23,
p.
174
Sample
ID
(address)
Date
Concentration
of
arsenic
(mg/
kg)
MDL*
(mg/
kg)
Reference
Value
Conversion*

HRS
Documentation
Record
04/
20/
01
Eureka
Mills
UT0002240158
20
E298WLD18Y01
(298
W.
Leadville)
9/
1/
00
130
J
75
0.
2
Refs.
14,
Table
8,
p.
155,
App.
D.,
pp.
41,
42,
54;
23,
p.
178
E304BED12Y01
(304
S.
Beck)
10/
18/
00
160
­
0.
2
Refs.
14,
Table
8,
p.
155,
App.
D.,
p.
391;
23,
p.
181
E317WMD06D01
(317
W.
Main)
11/
11/
00
980
­
0.
2
Refs.
14,
Table
8,
p.
155,
App.
D.,
p.
614;
23,
p.
183
E321RRD06Y01
(321
W.
Railroad)
11/
14/
00
76
­
0.
2
Refs.
14,
Table
8,
p.
155,
App.
D.,
p.
558;
23,
p.
185
E325BED06Y01
(325
S.
Beck)
10/
18/
00
47
­
0.
2
Refs.
14,
Table
8,
p.
155,
App.
D.,
p.
390;
23,
p.
186
E329DUD06Y02
(329
W.
Dublin)
9/
19/
00
2,100
­
0.
2
Refs.
14,
Table
8,
p.
155,
App.
D.,
p.
252;
23,
p.
187
E330EMD18L01
(330
E.
Main)
11/
27/
00
110
­
0.
2
Refs.
14,
Table
8,
p.
155,
App.
D.,
p.
671;
23,
p.
188
E330WMD12Y
(330
W.
Main)
11/
2/
00
230
­
0.
2
Refs.
14,
Table
8,
p.
155,
App.
D.,
p.
542;
23,
p.
189
E348EMD06A08
(348
E.
Main)
11/
22/
00
340
­
0.
2
Refs.
14,
Table
8,
p.
156,
App.
D.,
p.
646;
23,
p.
192
E354BED06Y05
(354
S.
Beck)
10/
18/
00
50
­
0.
2
Refs.
14,
Table
8,
p.
156,
App.
D.,
p.
394;
23,
p.
193
E441EMD06A02
(441
E.
Main)
11/
27/
00
63
­
0.
2
Refs.
14,
Table
8,
p.
156,
App.
D.,
p.
667;
23,
p.
201
E525EMD18Y53
(525
E.
Main
(High
School))
8/
31/
00
710
­
0.
2
Refs.
14,
Table
8,
p.
156,
App.
D.,
p.
589;
23,
p.
203
HRS
Documentation
Record
04/
20/
01
Eureka
Mills
UT0002240158
21
*
J
values
shown
in
the
contaminated
samples
table
have
been
converted
(if
needed)
for
unknown
or
high
biases
using
multipliers
found
in
the
EPA
quick
reference
sheet
"Using
Qualified
Data
to
Document
an
Observed
Release
and
Observed
Contamination"
(Ref.
19).

*
For
non­
CLP
analysis,
MDL
supplied
by
EPA
Contract
Laboratory,
corrected
for
soil
samples
(i.
e.
multiply
MDL
by
0.1
to
express
as
mg/
kg)
(Ref.
20).

**
For
CLP
analysis,
estimated
Sample
Quantitation
Limits
(SQLs)
are
calculated
from
Contract
Required
Detection
Limits
(CRDLs)
supplied
by
EPA
Contractor
Laboratory
(Ref.
21)
using
the
following
formula
(assuming
a
final
volume
of
200
milliliters
and
a
sample
weight
of
1
gram):

CRDL
(ug/
L)
x
200
ml
x
1,000
ug/
mg
x
dilution
1,000
ml/
L
x
1
g
x
1,000
g/
kg
x
(%
solids/
100)
HRS
Documentation
Record
04/
20/
01
Eureka
Mills
UT0002240158
22
­
Level
II
Contaminated
Samples
Surface
Soil,
<
18
inches
bgs,
all
samples
show
concentrations
of
lead.
Samples
from
addresses
already
showing
Level
I
contamination
are
not
included.

Sample
ID
Date
Concentration
of
lead
(mg/
kg)
MDL*
(mg/
kg)
Reference
Value
Conversion*

E004EHD06Y
(4
E.
Hannifin)
10/
4/
00
650
­
2
Refs.
14,
Table
8,
p.
145,
App.
D.,
p.
346;
23,
p.
6
E014WMD18Y
(14
W.
Main)
11/
4/
00
1,200
­
2
Refs.
14,
Table
8,
p.
145,
App.
D.,
p.
551;
23,
p.
9
E018WAD06L02
(18
W.
Arlington)
10/
3/
00
840
­
2
Refs.
14,
Table
8,
p.
145,
App.
D.,
p.
366;
23,
p.
13
E025WLD06Y
(25
W.
Leadville)
9/
14/
00
670
­
2
Refs.
14,
Table
8,
p.
145,
App.
D.,
p.
204;
23,
p.
18
E031CHD12Y
(31
N.
Church)
9/
11/
00
1,300
­
2
Refs.
14,
Table
8,
p.
146,
App.
D.,
p.
130;
23,
p.
27
E036SHD06Y
(36
Shriver)
11/
14/
00
1,000
­
2
Refs.
14,
Table
8,
p.
146,
App.
D.,
p.
556;
23,
p.
30
E065IOD06L03
(65
W.
Iron
&
O'Conner)
11/
7/
00
770
­
2
Refs.
14,
Table
8,
p.
148,
App.
D.,
p.
480;
23,
p.
56
E066CED06Y
(66
N.
Center)
10/
2/
00
1,000
­
2
Refs.
14,
Table
8,
p.
148,
App.
D.,
p.
336;
23,
p.
57
E071CHD06L02
(71
N.
Church)
9/
11/
00
800
­
2
Refs.
14,
Table
8,
p.
148,
App.
D.,
p.
137;
23,
p.
62
E080CED12Y
(80
N.
Center)
10/
2/
00
680
­
2
Refs.
14,
Table
8,
p.
148,
App.
D.,
p.
337;
23,
p.
70
E102JAD06A
(102
Jarvis)
10/
26/
00
810
­
2
Refs.
14,
Table
8,
p.
149,
App.
D.,
p.
434;
23,
p.
85
Sample
ID
Date
Concentration
of
lead
(mg/
kg)
MDL*
(mg/
kg)
Reference
Value
Conversion*

HRS
Documentation
Record
04/
20/
01
Eureka
Mills
UT0002240158
23
E123CLD06Y
(123
N.
Clark)
10/
19/
00
2,100
­
2
Refs.
14,
Table
8,
p.
150,
App.
D.,
p.
397;
23,
p.
93
E127WLD06Y
(127
W.
Leadville)
11/
3/
00
1,500
­
2
Refs.
14,
Table
8,
p.
150,
App.
D.,
p.
543;
23,
p.
97
E135HAD06Y01
(135
S.
Haulage)
10/
25/
00
1,100
­
2
Refs.
14,
Table
8,
p.
150,
App.
D.,
p.
413;
23,
p.
104
E142IOD06Y
(142
W.
Iron
&
O'Conner)
10/
20/
00
640
­
2
Refs.
14,
Table
8,
p.
151,
App.
D.,
p.
403;
23,
p.
107
E146RID06Y01
(146
W.
Richens)
10/
12/
00
730
­
2
Refs.
14,
Table
8,
p.
151,
App.
D.,
p.
351;
23,
p.
109
E148CHD12Y
(148
N.
Church)
9/
12/
00
630
­
2
Refs.
14,
Table
8,
p.
148,
App.
D.,
p.
143;
23,
p.
110
E182DED12Y
(182
W.
Deprizin)
10/
13/
00
700
­
2
Refs.
14,
Table
8,
p.
152,
App.
D.,
p.
358;
23,
p.
125
E183WMD06Y
(183
W.
Main)
11/
1/
00
3,500
­
2
Refs.
14,
Table
8,
p.
152,
App.
D.,
p.
507;
23,
p.
126
E201JAD06Y
(201
Jarvis)
9/
26/
00
880
­
2
Refs.
14,
Table
8,
p.
152,
App.
D.,
p.
314;
23,
p.
134
E276ELD12Y01
(276
E.
Leadville)
9/
7/
00
600
­
2
Refs.
14,
Table
8,
p.
154,
App.
D.,
p.
88;
23,
p.
160
E277WLD06L
(277
W.
Leadville)
11/
4/
00
1,000
­
2
Refs.
14,
Table
8,
p.
154,
App.
D.,
p.
497;
23,
p.
162
E295WMD12Y
(295
W.
Main)
11/
6/
00
710
­
2
Refs.
14,
Table
8,
p.
155,
App.
D.,
p.
604;
23,
p.
175
Sample
ID
Date
Concentration
of
lead
(mg/
kg)
MDL*
(mg/
kg)
Reference
Value
Conversion*

HRS
Documentation
Record
04/
20/
01
Eureka
Mills
UT0002240158
24
E310WLD12Y
(310
W.
Leadville)
11/
3/
00
930
­
2
Refs.
14,
Table
8,
p.
155,
App.
D.,
p.
545;
23,
p.
182
E337RRD06Y
(337
W.
Railroad)
10/
17/
00
770
­
2
Refs.
14,
Table
8,
p.
156,
App.
D.,
p.
388;
23,
p.
191
EM­
SO­
16
(MHET73)
(385
Evans
Way)
7/
5/
00
1070
­
0.
65**
Ref.
6,
p.
20,
App.
F,
p.
65
*
J
values
shown
in
the
contaminated
samples
table
have
been
converted
(if
needed)
for
unknown
or
high
biases
using
multipliers
found
in
the
EPA
quick
reference
sheet
"Using
Qualified
Data
to
Document
an
Observed
Release
and
Observed
Contamination"
(Ref.
19).

*
For
non­
CLP
analysis,
MDL
supplied
by
EPA
Contract
Laboratory,
corrected
for
soil
samples
(i.
e.
multiply
MDL
by
0.1
to
express
as
mg/
kg)
(Ref.
20).

**
For
CLP
analysis,
estimated
Sample
Quantitation
Limits
(SQLs)
are
calculated
from
Contract
Required
Detection
Limits
(CRDLs)
supplied
by
EPA
Contractor
Laboratory
(Ref.
21)
using
the
following
formula
(assuming
a
final
volume
of
200
milliliters
and
a
sample
weight
of
1
gram):

CRDL
(ug/
L)
x
200
ml
x
1,000
ug/
mg
x
dilution
1,000
ml/
L
x
1
g
x
1,000
g/
kg
x
(%
solids/
100)

­
Additional
Observed
Contamination
Samples
HRS
Documentation
Record
04/
20/
01
Eureka
Mills
UT0002240158
25
Sample
ID
Date
Concentration
of
arsenic
(mg/
kg)
MDL*
(mg/
kg)
Reference
Value
Conversion*

E016WID06Y
(16
W.
Wild)
11/
11/
00
63
­
0.
2
Refs.
14,
Table
8,
p.
145,
App.
D.,
p.
616;
23,
p.
12
E037LCD12L
(37
N.
Last
Chance)
11/
24/
00
280
­
0.
2
Refs.
14,
Table
8,
p.
146,
App.
D.,
p.
652;
23,
p.
31
E063EAD06Y01
(63
E.
Arlington)
11/
01/
00
46
­
0.
2
Refs.
14,
Table
8,
p.
147,
App.
D.,
p.
598;
23,
p.
54
E066MCD06L
(66
S.
McChrystal)
11/
20/
00
190
­
0.
2
Refs.
14,
Table
8,
p.
148,
App.
D.,
p.
640;
23,
p.
58
E067LCD18L
(67
N.
Last
Chance)
11/
24/
00
150
­
0.
2
Refs.
14,
Table
8,
p.
148,
App.
D.,
p.
654;
23,
p.
60
E076RID06L
(76
W.
Richens)
10/
13/
00
870
­
0.
2
Refs.
14,
Table
8,
p.
148,
App.
D.,
p.
355;
23,
p.
68
E090TSD06L18
(90
T.
Street)
11/
25/
00
490
­
0.
2
Refs.
14,
Table
8,
p.
149,
App.
D.,
p.
660;
23,
p.
76
E096WMD06L02
(96
W.
Main)
11/
04/
00
260
­
0.
2
Refs.
14,
Table
8,
p.
149,
App.
D.,
p.
567;
23,
p.
78
E099MCD06Y01
(99
S.
McChrystal)
11/
20/
00
220
­
0.
2
Refs.
14,
Table
8,
p.
149,
App.
D.,
p.
678;
23,
p.
80
E100EMD12S
(100
E.
Main)
9/
28/
00
88
­
0.
2
Refs.
14,
Table
8,
p.
149,
App.
D.,
p.
299;
23,
p.
81
E131WLD06L01
(131
W.
Leadville)
11/
03/
00
94
­
0.
2
Refs.
14,
Table
8,
p.
150,
App.
D.,
p.
517;
23,
p.
100
E155BUD06D01
(155
N.
Butler)
11/
06/
00
52
­
0.
2
Refs.
14,
Table
8,
p.
151,
App.
D.,
p.
605;
23,
p.
114
Sample
ID
Date
Concentration
of
arsenic
(mg/
kg)
MDL*
(mg/
kg)
Reference
Value
Conversion*

HRS
Documentation
Record
04/
20/
01
Eureka
Mills
UT0002240158
26
E160LCD06L
(160
N.
Last
Chance)
11/
29/
00
64
­
0.
2
Refs.
14,
Table
8,
p.
151,
App.
D.,
p.
677;
23,
p.
115
E174GOD12L
(174
E.
Godiva)
10/
20/
00
69
J
­
0.2
Refs.
14,
Table
8,
p.
151,
App.
D.,
pp.
376,
377,
400;
23,
p.
121
E201DED12L01
(201
W.
Deprizin)
11/
08/
00
170
J
98
0.
2
Refs.
14,
Table
8,
p.
152,
App.
D.,
pp.
464,
486;
23,
p.
133
E215WMD18D
(215
W.
Main)
11/
21/
00
890
­
0.
2
Refs.
14,
Table
8,
p.
153,
App.
D.,
p.
644;
23,
p.
138
E244WMD06L
(244
W.
Main)
11/
02/
00
710
­
0.
2
Refs.
14,
Table
8,
p.
154,
App.
D.,
p.
447;
23,
p.
149
E245WLD12L
(245
W.
Leadville)
11/
03/
00
300
­
0.
2
Refs.
14,
Table
8,
p.
154,
App.
D.,
p.
519;
23,
p.
150
E261DED06L
(261
W.
Deprizin)
11/
07/
00
200
J
114
0.2
Refs.
14,
Table
8,
p.
154,
App.
D.,
pp.
464,
476;
23,
p.
156
E265WLD06L02
(265
W.
Leadville)
11/
04/
00
67
­
0.
2
Refs.
14,
Table
8,
p.
154,
App.
D.,
p.
494;
23,
p.
157
E275WMD12D
(275
W.
Main)
11/
21/
00
340
­
0.
2
Refs.
14,
Table
8,
p.
154,
App.
D.,
p.
645;
23,
p.
158
E282WAD06L
(282
W.
Arlington)
10/
28/
00
270
­
0.
2
Refs.
14,
Table
8,
p.
154,
App.
D.,
p.
439;
23,
p.
164
E285WMD06Y
(285
W.
Main)
11/
2/
00
800
­
0.
2
Refs.
14,
Table
8,
p.
155,
App.
D.,
p.
541;
23,
p.
167
E294WMD18L
(294
W.
Main)
11/
02/
00
680
­
0.
2
Refs.
14,
Table
8,
p.
155,
App.
D.,
p.
448;
23,
p.
172
Sample
ID
Date
Concentration
of
arsenic
(mg/
kg)
MDL*
(mg/
kg)
Reference
Value
Conversion*

HRS
Documentation
Record
04/
20/
01
Eureka
Mills
UT0002240158
27
E295DED06L
(295
W.
Deprizin)
9/
15/
00
78
­
0.
2
Refs.
14,
Table
8,
p.
155,
App.
D.,
p.
436;
23,
p.
173
E296WMD06L
(296
W.
Main)
11/
02/
00
180
­
0.
2
Refs.
14,
Table
8,
p.
155,
App.
D.,
p.
514;
23,
p.
177
E332EMD06L
(332
E.
Main)
11/
21/
00
140
­
0.
2
Refs.
14,
Table
8,
p.
156,
App.
D.,
p.
641;
23,
p.
190
E370EVD18L
(370
W.
Evans)
11/
24/
00
260
­
0.
2
Refs.
14,
Table
8,
p.
156,
App.
D.,
p.
653;
23,
p.
194
E380EVD06L
(380
W.
Evans)
11/
24/
00
91
­
0.
2
Refs.
14,
Table
8,
p.
156,
App.
D.,
p.
650;
23,
p.
195
E390EVD12L
(390
W.
Evans)
11/
24/
00
89
­
0.
2
Refs.
14,
Table
8,
p.
156,
App.
D.,
p.
651;
23,
p.
196
E391MAD06A01
(391
Maccey)
11/
20/
00
1,000
­
0.
2
Refs.
14,
Table
8,
p.
156,
App.
D.,
p.
639;
23,
p.
197
E402MAD06L
(402
Maccey)
11/
20/
00
270
­
0.
2
Refs.
14,
Table
8,
p.
156,
App.
D.,
p.
638;
23,
p.
198
E421WMD06Y
(421
W.
Main)
11/
28/
00
370
­
0.
2
Refs.
14,
Table
8,
p.
156,
App.
D.,
p.
675;
23,
p.
199
E423EMD06L01
(423
E.
Main)
11/
21/
00
360
­
0.
2
Refs.
14,
Table
8,
p.
156,
App.
D.,
p.
642;
23,
p.
200
HRS
Documentation
Record
04/
20/
01
Eureka
Mills
UT0002240158
28
Sample
ID
Date
Concentration
of
lead
(mg/
kg)
MDL*
(mg/
kg)
Reference
Value
Conversion*

E002IOD06L01
(2
Iron
and
O'Conner)
9/
26/
00
800
­
2
Refs.
14,
Table
8,
p.
145,
App.
D.,
p.
362;
23,
p.
5
E046SHD06L
(46
Shriver)
11/
17/
00
980
­
2
Refs.
14,
Table
8,
p.
146,
App.
D.,
p.
561;
23,
p.
41
E052CFD06L02
(52
Chief)
11/
01/
00
990
­
2
Refs.
14,
Table
8,
p.
147,
App.
D.,
p.
446;
23,
p.
46
E121GOD06L
(121
E.
Godiva)
10/
26/
00
1,400
­
2
Refs.
14,
Table
8,
p.
150,
App.
D.,
p.
415;
23,
p.
92
E220WAD06L
(220
W.
Arlington)
11/
07/
00
1,000
­
2
Refs.
14,
Table
8,
p.
153,
App.
D.,
p.
504;
23,
p.
140
E241DED06L
(241
W.
Deprizin)
11/
07/
00
1,300
­
2
Refs.
14,
Table
8,
p.
153,
App.
D.,
p.
478;
23,
p.
147
E301WMD06D
(301
W.
Main)
11/
22/
00
1,200
­
2
Refs.
14,
Table
8,
p.
155,
App.
D.,
p.
649;
23,
p.
179
*
J
values
shown
in
the
contaminated
samples
table
have
been
converted
(if
needed)
using
multipliers
found
in
the
EPA
quick
reference
sheet
"Using
Qualified
Data
to
Document
an
Observed
Release
and
Observed
Contamination"
(Ref.
19)

*
For
non­
CLP
analysis,
MDL
supplied
by
EPA
Contract
Laboratory,
corrected
for
soil
samples
(i.
e.
multiply
MDL
by
0.1
to
express
as
mg/
kg)
(Ref.
20).

Attribution
A
comparison
of
soil
samples
to
background
samples
collected
during
the
2000
SI
sampling
resulted
in
the
delineation
of
an
area
of
arsenic
and
lead
contaminated
soils
encompassing
6,608,997.26
square
feet
after
subtracting
the
paved
area
found
within
the
areas
of
contamination
(Ref.
16).
The
area
of
contaminated
soils
was
delineated
by
comparing
the
site
soil
samples
to
the
background
arsenic
concentration
of
14.7
mg/
kg
and
lead
background
of
198
J
mg/
kg
(Ref.
6)
(see
also
the
table
on
page
17
of
this
document
record).
HRS
Documentation
Record
04/
20/
01
Eureka
Mills
UT0002240158
29
The
mining
district
of
Tintic
was
organized
in
the
spring
of
1870
(Ref.
10,
p.
613).
Development
of
the
district
was
slow
due
to
the
lack
of
transportation
from
the
mine
sites.
It
was
not
economical
to
ship
the
lower
grade
ores,
so
milling
and
smelting
operations
were
developed
near
the
mines
(Ref.
11,
p.
105).
These
mills
concentrated
ores
for
shipping.

Between
1872
and
1917,
a
total
of
14
mills
may
have
been
operated
in
the
Tintic
District.
Only
four
significant
mills
have
been
identified
in
the
immediate
area
surrounding
Eureka.
These
four
locations
are
the
Bullion
Beck
Mill;
Eureka
Hill
Mill;
the
Utah
Mineral
Concentrating
Company
experimental
mill
and
the
Chief
flotation
mill;
and
the
mills
at
May
Day,
Godiva,
and
Uncle
Sam,
which
are
three
small
collocated
mills
that
are
treated
as
one
mill
in
the
SI
Work
Plan
(Ref.
7).

The
Bullion
Beck
Mill
was
built
in
1894
and
operated
until
1898.
It
consisted
of
a
roller
mill
and
a
concentrating
plant
with
a
daily
capacity
of
200
tons
(Refs.
10,
p.
613;
9,
p.
405).
The
Eureka
Hill
Mill
was
a
100­
stamp
mill
with
a
daily
capacity
of
250
tons
(Ref.
11,
p.
116).
There
were
a
few
historic
mills
constructed
around
the
Chief
mine.
The
Utah
Mineral
Concentrating
Company
built
an
experimental
mill
east
of
the
Chief
No.
1
shaft
in
1914.
This
mill
processed
low­
grade
ores
from
various
parts
of
the
Tintic
District,
and
especially
from
the
Chief
mine.
This
mill
had
a
capacity
of
100
tons
of
ore
a
day
and
closed
in
1916
(Ref.
9,
p.
406).
In
1924,
the
Chief
mine
constructed
a
flotation
mill
east
of
its
No.
1
shaft
and
west
of
the
experimental
mill.
This
mill
processed
ore
from
the
Chief's
main
property
as
well
as
the
old
Eureka
Hill
Mill
dump
that
Chief
Consolidated
owned
as
of
1922
(Ref.
12,
p.
140).
In
1929,
this
mill
had
a
capacity
of
168
tons
per
day
(Ref.
13,
p.
162).
Mills
were
also
constructed
by
individual
mines
at
or
near
the
May
Day,
Godiva,
and
Uncle
Sam
mines
for
the
reduction
of
lower
grade
ores.
The
May
Day
Mill
was
completed
in
1900
and
by
1907
its
daily
capacity
was
65
tons
(Ref.
11,
pp.
107,
116).
In
1905,
a
concentration
mill
was
completed
on
the
Godiva
property.
The
Uncle
Sam
Mill,
completed
in
either
1903
or
1905,
processed
ore
from
its
respective
mine
(Refs.
9,
p.
405;
11,
p.
116;
12,
p.
86).
Production
values
could
not
be
found
for
these
mills,
but
by
1912,
the
May
Day
Mill
was
the
only
mill
still
operating
in
the
Tintic
District
(Ref.
12,
p.
86).

A
number
of
smelters
have
also
operated
in
the
Tintic
District
over
the
years.
However,
none
were
very
successful
nor
operated
for
any
substantial
length
of
time.
The
reasons
for
the
lack
of
success
were
the
refractory
nature
of
the
ore
and
the
lack
of
water
in
the
district
(Refs.
9,
page
403;
10,
p.
614).
Water
was
eventually
supplied
by
wells
sunk
near
Homansville,
about
2.5
miles
east,
and
a
pipeline
was
run
to
Mammoth
from
Cherry
Creek,
18
miles
distant.
The
closest
smelter
to
the
town
of
Eureka
was
erected
at
Homansville.
This
smelter
operated
for
approximately
one
year
and
produced
only
several
hundred
tons
of
lead
bullion
before
closing
(Ref.
11,
p.
114).
The
subsequent
lowering
of
smelting
rates
and
the
improvements
in
transportation
made
it
more
profitable
for
the
mining
companies
to
ship
to
the
smelters
near
Salt
Lake
City
(Ref.
11,
p.
115).

Multiple
tailings
piles
associated
with
milling
activities
and
waste
rock
piles
associated
with
mining
activities
are
located
in
and
around
Eureka
(Ref.
6,
p.
6,
Figure
3).
Seven
of
these
piles
lie
south
of
Main
Street
(Highway
6)
and
three
piles
lie
to
the
west
of
Highway
6,
at
the
western
end
of
Eureka
(Refs.
15,
p.
1;
6,
pp.
5,
6,
7).
The
UDEQ
collected
samples
from
these
waste
piles
as
part
of
the
SI
in
July
2000.
Analytical
data
from
this
sampling
event
indicate
the
presence
of
elevated
concentrations
of
metals
in
the
piles,
including
arsenic
at
concentrations
as
great
as
1,460
J
mg/
kg
(MHET86)
and
lead
at
concentrations
as
great
as
47,800
J
mg/
kg
(MHET85)
(Ref.
6,
pp.
6
through
11,
Table
3,
Figures
3
and
4).
Homes
exist
within
200
feet
of
some
of
these
waste
piles
(Ref.
6,
p.
6).

The
UDEQ
collected
22
soil
samples
from
the
Eureka
area
in
2000
(Ref.
6,
p.
1).
Soil
samples
were
collected
from
residential
areas,
from
the
Tintic
High
School
and
Eureka
Elementary
Schools,
and
HRS
Documentation
Record
04/
20/
01
Eureka
Mills
UT0002240158
30
adjacent
to
mill
sites.
These
samples
were
analyzed
for
total
metals
and
indicated
the
presence
of
arsenic
and
lead
concentrations
as
great
as
1,030
mg/
kg
(MHET76)
and
29,300
mg/
kg
(MHET76),
respectively
(Ref
.6,
Fig.
4,
Table
3,
p.
3,
App.
F,
p.
95).
Other
total
metal
analytes
that
were
recorded
in
soils
at
levels
greater
than
three
times
background
included
calcium,
zinc,
cadmium,
silver,
copper,
mercury,
antimony,
thallium,
selenium,
sodium,
and
magnesium
(Reference
6,
p
20­
23).

A
Removal
Evaluation
was
begun
in
August
2000
by
the
BOR
and
EPA
START
contractors.
Approximately
4,205
surface
soil
samples
(from
less
than
18
inches
bgs)
were
collected
from
accessible
properties
in
Eureka
(Ref.
14,
p.
1).
Analytical
results
from
soil
samples
submitted
to
the
laboratory
indicate
the
presence
of
arsenic
concentrations
in
surface
soils
ranging
from
46
mg/
kg
(lowest
concentration
for
establishing
significance
above
background)
to
a
maximum
of
2,100
mg/
kg,
and
lead
concentrations
up
to
37,000
J
mg/
kg
(Refs.
14,
Table
8,
pp.
146,
155;
App.
D.,
pp.
252,
600,
664).
This
area
of
contamination
is
delineated
based
on
a
comparison
of
confirmation
sample
results
to
the
background
arsenic
concentration
of
14.7
mg/
kg
and
background
lead
concentration
of
198
J
mg/
kg
collected
during
the
SI
sampling
event
(Ref.
6,
App
F.,
pp.
74,
101).

The
methods
of
migration
for
the
contamination
are
various.
Historical
flooding
has
occurred,
which
may
have
served
to
transport
mine
and
mill
wastes
downgradient
toward
the
town
(Refs.
5,
pp.
9,
10;
12,
pp.
68,
69).
Human
actions
also
probably
have
served
to
spread
contamination
around
the
town
of
Eureka.
Wastes
from
the
Chief
Mill
milling
process
were
allowed
to
flow
downhill
and
into
Eureka
Gulch
(Ref.
5,
p.
7).
In
1900,
tailings
ponds
at
the
Eureka
Hill
Mill
broke
and
flooded
Eureka
Gulch
(Ref.
5,
p.
5).
The
use
of
mine
and
mill
waste
as
fill
material
around
the
town
appears
to
have
been
widespread
(Ref.
6,
pp.
13,
14,
15,
18).
Horse
teams
and
wagons
hauled
most
of
the
districts
ore
in
its
early
days
(Ref.
12,
p.
37).
It
is
likely
that
some
of
the
ore
carried
in
this
manner
was
inadvertently
lost
during
transportation.
Aerial
deposition
from
blowing
dust,
and
to
a
lesser
extent,
smelting,
are
also
potential
modes
of
contaminant
transportation
(Ref.
6,
p.
25).

Area
of
Contamination
Hazardous
Waste
Quantity
­
Area:
Contaminated
soils
Description
The
total
area
of
observed
soil
contamination
encompasses
an
expanse
of
7,470,577.57
square
feet
(Ref.
16);
however,
of
this
area
an
estimated
861,580.31
square
feet
is
paved
(Ref.
16).
Per
table
5­
2
of
the
HRS
(Ref.
1)
the
hazardous
waste
quantity
is
determined
as
follows:
7,470,577.57
square
feet
861,580.31
square
feet
=
6,608,997.26/
34,000
=
194.38.

Source
Type
Units
(feet
2
)
References
Contaminated
Soil
6,608,997.26
Ref.
16
Sum
(feet
2
):
6,608,997.26
Equation
for
Assigning
Area
Value
(Table
5­
2):
6,608,997.26/
34,000
=
194.38
Assigned
Area
Value:
194.38
HRS
Documentation
Record
04/
20/
01
Eureka
Mills
UT0002240158
31
Source
Type
Assigned
Area
Value
References
Contaminated
Soil
194.38
Ref.
1,
Table
5­
2;
16
Total
194.38
HRS
Documentation
Record
04/
20/
01
Eureka
Mills
UT0002240158
32
5.1
RESIDENT
POPULATION
THREAT
The
property
boundaries
on
the
GIS
map
were
generated
using
BOR
survey
data
that
were
collected
based
on
professional
judgement,
field
observations
(such
as
existing
fence
lines),
discussions
with
property
owners,
and
Eureka
City
Survey
plat
maps
gathered
from
the
Juab
County
Recorders
Office
(Ref.
16).
Survey
plats
were
then
generated
for
each
residence
(Ref.
23)
This
information
was
keyed
by
ground
control
survey
(base
map
provided
to
UOS
by
the
BOR)
to
GIS
mapping
software
(ArcInfo)
by
UOS
to
produce
the
GIS
map
that
is
Reference
16.

From
a
total
of
247
discrete
depth
soil
samples
that
were
sent
for
laboratory
confirmation
(225
sent
by
BOR
and
22
sent
by
UDEQ),
95
exhibited
arsenic
contamination
at
levels
meeting
the
criteria
for
significance
above
background
(Level
I),
and
26
met
the
requirements
for
significance
above
background
regarding
lead
(Level
II).
These
numbers
do
not
include
multiple
discrete
samples
collected
from
single
addresses.
Only
the
samples
with
the
highest
recorded
concentrations
from
these
properties
were
used
on
the
GIS
map
(Ref.
16).
In
addition
to
these
Level
I
and
Level
II
target
samples,
41
other
samples
documented
an
observed
release
but
were
not
collected
from
within
200
feet
of
a
residence.
These
samples
are
also
shown
on
the
GIS
map
(Ref.
16).

5.1.1
LIKELIHOOD
OF
EXPOSURE
The
presence
of
arsenic
and/
or
lead
contamination
in
concentrations
meeting
observed
contamination
requirements
on
residential
property
within
200
feet
of
the
primary
dwelling
establishes
a
resident
population
threat
for
the
site.
(Ref.
1,
Section
5.1,
p.
51646).

Resident
Population
Threat
Likelihood
of
Exposure
Factor
Category
Value:
550
5.1.2
WASTE
CHARACTERISTICS
5.1.2.1
Toxicity
Hazardous
Substance
Toxicity
Factor
Value
Reference
Arsenic
10,000
Ref.
2,
p.
B­
2
Lead
10,000
Ref.
2,
p.
B­
13
Toxicity
Factor
Value:
10,000
5.1.2.2
Hazardous
Waste
Quantity
HRS
Documentation
Record
04/
20/
01
Eureka
Mills
UT0002240158
33
Area
Source
Type
Area
Hazardous
Waste
Quantity
Contaminated
soil
Contaminated
Soil
194.38
Sum
of
Values:
194.38
Hazardous
Waste
Quantity
Factor
Value:
100
(Ref
1,
Table
2­
6)

5.1.2.3
Calculation
of
Waste
Characteristics
Factor
Category
Value
Toxicity
Factor
Value:
10,000
Hazardous
Waste
Quantity
Factor
Value:
100
Toxicity
Factor
Value
x
Hazardous
Waste
Quantity
Factor
Value:
1,000,000
Waste
Characteristics
Factor
Category
Value:
32
(Ref.
1,
Table
2­
7)

5.1.3
TARGETS
5.1.3.1
Resident
Individual
Level
of
Contamination
(Level
I/
Level
II):
Level
I
There
are
93
residential
soil
samples
that
exhibit
Level
I
arsenic
contamination
within
the
Eureka
Mills
study
area.
These
samples
delineate
an
area
of
observed
soil
contamination
and
document
the
presence
of
Level
I
soil
contamination
at
each
residence.
These
samples
were
all
collected
on
the
resident
individual's
property
and
within
200
linear
feet
of
the
residence;
therefore,
a
resident
individual
factor
of
50
is
assigned.

References:
1,
Section
5.1.3.1,
p.
51647;
16
Resident
Individual
Factor
Value:
50
In
addition
to
the
residential
soil
samples
that
exhibit
Level
I
arsenic
contamination,
there
is
also
documented
arsenic
contamination
within
200
feet
of
both
the
Tintic
High
School
and
Eureka
Elementary
School
properties.
Sample
E525EMD18Y53
was
collected
from
a
traffic
island
in
front
of
the
school
that
is
occasionally
used
by
students
(Refs.
16;
24).
This
sample
showed
an
arsenic
concentration
of
710
mg/
kg
(Ref.
14,
Table
8,
p.
191;
16).
According
to
a
school
official,
the
current
student
population
of
Tintic
High
School
is
106
(Ref.
22).
Sample
E055EMD06Y13
was
collected
from
a
grassy
area
near
an
administrative
building
to
the
east
of
the
school.
This
sample
showed
an
arsenic
concentration
of
130
J
mg/
kg
(Refs.
16;
14,
Table
8,
p.
147,
App.
D.,
p.
207;
23,
p.
49).
According
to
a
school
official,
the
current
student
population
of
Tintic
High
School
is
107
(Ref.
25).
Both
of
these
student
populations
will
also
be
included
as
part
of
the
resident
population
(see
table
below).

5.1.3.2
Resident
Population
HRS
Documentation
Record
04/
20/
01
Eureka
Mills
UT0002240158
34
5.1.3.2.1
Level
I
Concentrations
Area
Sample
ID
Number
of
Residences
County
Multiplier
No.
of
Residents
or
Students
Contaminated
Soil
See
Level
I
Contaminated
Samples
Table,
pp.
13­
21
of
this
HRS
package
93
2.5
232.5
E525EMD18Y53
(High
School)
106
E055EMD06Y13
(Elementary
School)
107
Total
445.5
Sum
of
individuals
subject
to
Level
I
concentrations:
445.5
Sum
of
individuals
subject
to
Level
I
concentrations
x
10:
4,455
Analyses
from
residential
surface
soil
samples
collected
from
the
Eureka
Mills
study
area
indicate
the
presence
of
arsenic
at
levels
three
times
the
background
concentration
or
greater,
and
exceeding
the
cancer
risk
screening
concentration
at
93
residences
and
two
schools
(Refs.
2,
p.
B­
65;
16).
U.
S.
Department
of
Commerce,
Bureau
of
Census
data
(Ref.
8,
p.
11)
indicate
that
there
are
an
average
of
2.5
individuals
per
residence
in
Juab
County.
Based
on
these
figures
and
including
students
from
the
two
schools,
UOS
calculated
a
total
of
approximately
445.5
individuals
subject
to
Level
I
arsenic
concentrations.
Since
these
individuals
are
subject
to
Level
I
contamination,
the
appropriate
factor
value
is
determined
by
summing
the
individuals
subject
to
Level
I
contamination
and
multiplying
by
10
(Ref.
1,
Section
5.1.3.2.1,
p.
51647)
yielding
a
total
factor
value
of
4,455.

Level
I
Concentrations
Factor
Value:
4,455
5.1.3.2.2
Level
II
Concentrations
Area
Sample
ID
Number
of
Residences
County
Multiplier
Total
No.
of
Residents
HRS
Documentation
Record
04/
20/
01
Eureka
Mills
UT0002240158
35
Contaminated
Soil
See
Level
II
Contaminated
Samples
Table,
pp.
22­
24
of
this
HRS
package
26
2.5
65
additional
residences
meeting
Level
II
criteria
(without
sampling)
185
2.5
462.5
Total
527.5
There
are
an
additional
26
residences
exhibiting
observed
contamination
for
lead
but
cannot
be
considered
for
Level
I
contamination
as
there
is
no
benchmark
available
for
lead
for
the
Soil
Exposure
pathway
(Ref.
2).
U.
S.
Department
of
Commerce,
Bureau
of
Census
data
(Ref.
8,
p.
11)
indicate
that
there
are
an
average
of
2.5
individuals
per
residence
in
Juab
County.
Additionally,
185
residences
exist
within
the
contaminated
soil
boundary
from
which
no
discrete
sampling
data
exists.
All
185
of
these
residences
are
evaluated
as
subject
to
Level
II
contamination
and
are
shown
on
the
GIS
Map
(Ref.
16).

Sum
of
individuals
subject
to
Level
II
concentrations:
527.5
Level
II
Concentrations
Factor
Value:
527.5
5.1.3.3
Workers
Telephone
interviews
with
local
school
officials
confirmed
that
the
Tintic
School
District
employs
19
full
time
workers
and
that
Eureka
Elementary
School
employs
20
full
time
workers
(Refs.
22,
25).

Total
workers:
39
Workers
Factor
Value:
5
(Table
5­
4)
5.1.3.4
Resources
There
is
no
commercial
agriculture,
silviculture,
or
commercial
livestock
production
or
grazing
within
the
area
of
observed
contamination.

Resources
Factor
Value:
NS
5.1.3.5
Terrestrial
Sensitive
Environments
There
were
no
terrestrial
sensitive
environments
identified
within
the
area
of
observed
contamination.

Terrestrial
Sensitive
Environments
Factor
Value:
NS
HRS
Documentation
Record
04/
20/
01
Eureka
Mills
UT0002240158
36
5.2
NEARBY
POPULATION
THREAT
The
nearby
population
threat
was
not
evaluated
because
almost
all
of
the
residents
and
students
in
the
Eureka
area
live
within
the
area
of
observed
contamination.
There
are
insufficient
residents
and
students
living
outside
of
the
observed
area
of
contamination
to
significantly
affect
the
site
score.
