Document ID: EPA-HQ-SFUND-2002-0001-0069
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2002-09-03T04:00Z

2002­
0001­
0069
HAZARD
RANKING
SYSTEM
DOCUMENTATION
PACKAGE
PESTICIDE
WAREHOUSE
III
MANATI,
PUERTO
RICO
CERCLIS
ID
No.:
PRD987367299
VOLUME
1
of
1
Contract
No.
68­
W­
00­
121
Work
Order
No.
20031­
001­
001­
1022­
00
Document
Control
No.
20103.022.163
JANUARY
2002
Prepared
for:

UNITED
STATES
ENVIRONMENTAL
PROTECTION
AGENCY
Prepared
by:
Region
II
Site
Assessment
Team
Roy
F.
Weston,
Inc.
Edison,
NJ
08837
PESTICIDE
WAREHOUSE
III
Manati,
Puerto
Rico
The
Pesticide
Warehouse
III
(PWIII)
site
is
an
active
facility
located
at
Road
No.
670,
kilometer
(km)
3.7,
in
a
rural/
residential
area
of
Manati,
Puerto
Rico.
The
site
is
approximately
2
acres
in
size
and
consists
of
a
main
warehouse,
a
smaller
warehouse,
and
a
small
shed
which
contains
an
on­
site
well.
The
PWIII
site
is
bounded
to
the
south
by
Road
No.
670,
to
the
west
and
north
by
fields,
and
to
the
east
by
a
church
and
a
drug
and
alcohol
rehabilitation
center
(formerly
a
retirement
home).
The
site
is
currently
owned
and
operated
by
the
Puerto
Rico
Land
Authority
(PRLA).
Site
operations
during
this
period
included
the
storage
and
preparation
of
pesticides/
insecticides,
herbicides,
and
fertilizers.
PRLA
had
also
reportedly
used
part
of
the
warehouse
for
the
processing
and
canning
of
pineapple.

The
Puerto
Rico
Environmental
Quality
Board
(PREQB)
conducted
an
on­
site
reconnaissance
at
the
PWIII
site
on
12
April
1989.
This
reconnaissance
was
conducted
as
part
of
a
Preliminary
Assessment
(PA)
of
the
site.
During
the
on­
site
reconnaissance,
PREQB
observed
drums
containing
organochlorine
pesticides,
Toxaphene
E8,
and
Chemex.
In
addition,
bags
containing
various
pesticides
were
observed
within
the
warehouse.
Tanker
trucks
were
parked
near
loading
docks
where
pesticides
and
water
were
mixed
in
tanks.
All
excess
pesticides
and
spillage
were
noted
to
go
directly
to
the
surrounding
soil.
The
inside
of
the
main
warehouse
was
noted
to
have
a
strong
pesticide
odor
which
made
breathing
difficult.
There
were
also
reports
of
on­
site
workers
suffering
from
"intoxication"
in
the
work
area.

In
1992,
the
United
States
Geological
Survey
(USGS)
conducted
a
ground
water
quality
survey
in
the
area
within
the
Manati,
Puerto
Rico
Quadrangle.
This
investigation
consisted
of
the
collection
of
ground
water
samples
from
wells
located
within
the
Manati
Quadrangle
area,
including
the
well
located
on
the
PWIII
site.
Analytical
results
from
this
sampling
effort
indicated
the
presence
of
toxaphene
in
the
PWIII
well
at
a
concentration
of
6
micrograms
per
liter
(ug/
L).
Toxaphene
was
not
detected
above
minimum
reporting
level
(MRLs)
in
wells
located
immediately
upgradient
of
the
PWIII
well.
Dieldrin
was
also
detected
in
the
PWIII
well
at
a
concentration
of
0.24
ug/
L.
The
dieldrin
concentration
was
significantly
above
the
concentrations
detected
in
wells
located
immediately
upgradient
of
the
site.

In
1996­
1997,
EPA
conducted
a
Site
Inspection
(SI)
investigation
which
consisted
of
an
on­
site
reconnaissance
and
a
subsequent
sampling
site
inspection.
During
the
reconnaissance,
the
following
were
noted
to
be
stored
in
bags
within
the
main
warehouse:
magnesium
sulfate,
Ochoa
fertilizer,
sulfate
of
potash,
zinc
sulfate,
ferrous
sulfate,
urea,
MoCap
10G,
Karmex
DF,
Baylethon,
Hyvar
X,
Nemacor
3,
and
Solobar.
Spilled
materials
were
noted
throughout
the
warehouse.
In
addition,
stained
soils
were
noted
throughout
the
site.
Surface
drainage
was
observed
to
be
toward
the
west,
where
it
entered
a
drainage
ditch.
This
ditch
extended
along
the
western
and
northern
boundaries
of
the
site,
where
it
terminated
in
a
leach
pit
located
north
of
the
on­
site
buildings.
This
pit
was
observed
to
be
unlined
and
appeared
to
be
a
natural
sinkhole.

Based
on
the
potential
for
pesticide
contamination
on
site
and
the
potential
impact
to
off­
site
receptors,
EPA
conducted
an
SI
sampling
event
which
included
the
collection
of
15
surface
soil
samples
(depth:
0
to
6
inches)
at
locations
both
on
and
off
the
PWIII
site.
Diazinon,
Malathion,
Diuron,
and
Toxaphene
were
detected
in
on­
site
surface
soil
samples
at
concentrations
significantly
above
concentrations
detected
in
background
soil
samples
.
These
contaminants
were
also
detected
at
concentrations
significantly
above
background
samples
collected
from
the
leach
pit.
These
contaminants
were
either
observed
on
site
or
were
listed
in
site
Material
Safety
Data
Sheets
(MSDS).
Other
pesticides
detected
in
on­
site
soils
at
concentrations
significantly
above
background
included
alpha­
BHC,
Heptachlor,
Aldrin,
Endosulfan
I,
Dieldrin,
Endrin,
alpha­
Chlordane,
and
gamma­
Chlordane.
Several
pesticides
detected
on
the
PWIII
site
exceeded
EPA
Soil
Screening
Levels
(SSLs).
Zinc
was
also
detected
at
concentrations
significantly
above
background
in
both
on­
site
soils
and
the
retirement
home
located
adjacent
to
the
PWIII
site.

In
December
2001,
EPA
conducted
an
on­
site
reconnaissance
and
soil
field
screening
event.
This
investigation
was
conducted
to
assess
current
site
conditions,
and
to
determine
if
soil
conditions
have
changed
since
the
SI
sampling
event
conducted
in
1996.
During
the
reconnaissance,
it
was
noted
that
conditions
had
not
changed
since
the
SI.
Pesticide
mixing
activities
continue
to
take
place
on
the
loading
platform
area.
Spillage
was
noted
throughout
the
property.
Stained
soil
was
also
noted
in
the
vicinity
of
the
loading
platform,
and
stressed
vegetation
was
observed
along
the
runoff
pathway
from
the
loading
platform
to
the
drainage
ditch.
Field
screening
of
soil
was
conducted
utilizing
immunoassay
screening
method
which
identify
pesticides.
Results
from
this
field
screening
event
confirmed
the
presence
of
pesticides
in
11
of
the
12
samples
collected.

Two
sources
have
been
identified
for
the
Hazard
Ranking
System
(HRS)
evaluation
of
the
site:
contaminated
soil
(including
the
soil
within
the
drainage
ditch)
and
leach
pit.
There
are
other
areas
of
environmental
concern,
such
as
a
pit
observed
at
the
bottom
of
a
former
truck
scale
located
south
of
the
main
warehouse
entrance,
a
large
diesel
fuel
aboveground
storage
tank
(AST)
located
on
the
eastern
side
of
the
main
warehouse,
a
gasoline
or
diesel
fuel
underground
storage
tank
(UST)
located
west
of
the
main
warehouse,
a
cistern
located
below
the
ruined
northeast
portion
of
the
main
warehouse
building,
and
suspected
asbestos­
containing
materials
located
on
some
of
the
piping
runs
within
the
small
warehouse.

Based
on
the
analytical
results
of
ground
water
samples
collected
by
USGS
in
1992,
there
is
an
observed
release
of
toxaphene
and
dieldrin
to
the
North
Coast
Limestone
Aquifer
System
­
Upper
Aquifer,
which
is
the
aquifer
of
concern.
The
portion
of
this
aquifer
underlying
sources
at
the
PWIII
site
is
karst.
Potable
wells
within
the
PWIII
site
target
distance
limit
and
screened
in
the
aquifer
of
concern
serve
an
approximate
population
of
110,298
people.
The
nearest
potable
well
is
Coto
Sur
No.
5,
which
is
located
approximately
0.31
mile
east
of
the
PWIII
site.
This
well
serves
an
approximate
population
of
3,888
people.
In
addition
wellhead
protection
areas
exist
within
the
target
distance
limit
and
ground
water
is
used
as
a
resource.
The
Puerto
Rican
Boa,
a
federally­
listed
endangered
species
known
to
inhabit
forested
limestone
hills
in
Puerto
Rico,
was
identified
approximately
0.
4
miles
west
of
the
site.
HRS
DOCUMENTATION
RECORD­­
REVIEW
COVER
SHEET
Name
of
Site:
Pesticide
Warehouse
III
Contact
Persons
Site
Investigation:
Dennis
J.
Foerter,
CHMM
(732)
417­
5877
Roy
F.
Weston,
Inc.
Edison,
NJ
Documentation
Record:
Dennis
Munhall
(212)
637­
4343
U.
S.
Environmental
Protection
Agency
New
York,
NY
Dennis
J.
Foerter,
CHMM
(732)
417­
5877
Roy
F.
Weston,
Inc.
Edison,
NJ
Pathways,
Components,
or
Threats
Not
Scored
The
site
does
pose
a
threat
to
targets
within
the
Surface
Water
(i.
e.,
isolated
wetlands),
Soil
Exposure
(i.
e.,
on­
site
workers),
and
Air
(i.
e.,
workers/
residents)
Pathways.
However,
these
threats
were
not
scored
because
the
pathway
scores
would
not
impact
a
listing
decision.
1
HRS
DOCUMENTATION
RECORD
Name
of
Site:
Pesticide
Warehouse
III
EPA
Region:
2
Date
Prepared:
January
2002
Street
Address
of
Site:
Road
No.
670,
kilometer
3.7
County
and
State:
Manati,
PR
General
Location
in
the
State:
North
central,
PR
Topographic
Map:
Manati,
PR
Latitude:
18
E
25'
44.9"
North
Longitude:
66
E
27'
28.8"
West
Latitude/
Longitude
coordinates
correspond
to
the
location
of
the
main
warehouse
building
site
(Ref.
3).

EPA
ID
No.:
PRD987367299
Scores
Ground
Water
Pathway
100.00
Surface
Water
Pathway
Not
Scored
Soil
Exposure
Pathway
Not
Scored
Air
Pathway
Not
Scored
HRS
SITE
SCORE
50.00
2
WORKSHEET
FOR
COMPUTING
HRS
SITE
SCORE
S
S
2
1.
Ground
Water
Migration
Pathway
Score
(Sgw
)
100.00
10,000
(from
Table
3­
1,
line
13)

2a.
Surface
Water
Overland/
Flood
Migration
Component
Not
Scored
(from
Table
4­
1,
line
30)

2b.
Ground
Water
to
Surface
Water
Migration
Component
Not
Scored
(from
Table
4­
25,
line
28)

2c.
Surface
Water
Migration
Pathway
Score
(Ssw
)
Not
Scored
Enter
the
larger
of
lines
2a
and
2b
as
the
pathway
score.

3.
Soil
Exposure
Pathway
Score
(Ss
)
Not
Scored
(from
Table
5­
1,
line
22)

4.
Air
Migration
Pathway
Score
(Sa
)
Not
Scored
(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
3
GROUND
WATER
MIGRATION
PATHWAY
SCORESHEET
PESTICIDE
WAREHOUSE
III
GROUND
WATER
MIGRATION
PATHWAY
Factor
Categories
&
Factors
MAXIMUM
VALUE
VALUE
ASSIGNED
Likelihood
of
Release
to
an
Aquifer
Aquifer:
UPPER
AQUIFER
­
NORTH
COAST
LIMESTONE
AQUIFER
SYSTEM
1.
Observed
Release
2.
Potential
to
Release
2a.
Containment
2b.
Net
Precipitation
2c.
Depth
to
Aquifer
2d.
Travel
Time
2e.
Potential
to
Release
[lines
2a
(2b+
2c+
2d)]
3.
Likelihood
of
Release
550
10
10
5
35
500
550
550
550
Waste
Characteristics
4.
Toxicity/
Mobility
5.
Hazardous
Waste
Quantity
6.
Waste
Characteristics
*
*
100
10,000
10
18
Targets
7.
Nearest
Well
8.
Population
8a.
Level
I
Concentrations
8b.
Level
II
Concentrations
8c.
Potential
Contamination
8d.
Population
(lines
8a+
8b+
8c)
9.
Resources
10.
Wellhead
Protection
Area
11.
Targets
(lines
7+
8d+
9+
10)
12.
Targets
(including
overlaying
aquifers)
13.
Aquifer
Score
(lines
3x6x12
divided
by
82,500)
50
**
**
**
**
5
20
**
**
100
20
0
0
6,614
6,614
5
5
6,644
6,644
100.00
GROUND
WATER
MIGRATION
PATHWAY
SCORE
(Sgw)
100
100.00
*
Maximum
value
applies
to
waste
characteristics
category.
**
Maximum
value
not
applicable
4
REFERENCES
Reference
Number
Description
of
the
Reference
1.
U.
S.
Environmental
Protection
Agency
(EPA),
Revised
Hazard
Ranking
System,
Final
Rule,
excerpts,
40
CFR
300,
Appendix
A,
December
14,
1990.
[140
pp.]

2.
EPA,
Superfund
Chemical
Data
Matrix,
SCDM
Data
Version:
JUN96,
excerpts,
February
18,
1997.
[10
pp.]

3.
Foerter
D.,
Roy
F.
Weston,
Inc.
(WESTON),
Project
Note
to
Pesticide
Warehouse
III
file,
Subject:
Latitude
and
Longitude
Calculations,
November
27,
2001.
[2
p.
and
1
topographic
map]

4.
WESTON,
Final
Draft
Site
Inspection
Report,
Pesticide
Waterhouse
III,
Manati,
Puerto
Rico,
prepared
for
U.
S.
Environmental
Protection
Agency
(EPA),
May
1997.
[588
pp.]

5.
Foerter,
D.,
WESTON,
Project
Note
to
Pesticide
Warehouse
III
file,
Subject:
Ground
Water
Apportionment
Calculations,
January
8,
2002.
[15
pp.]

6.
Conde­
Costes,
C.,
and
Rodriguez­
Rodriguez,
G.,
Reconnaissance
of
Ground­
Water
Quality
in
the
Manati
Quadrangle,
Puerto
Rico,
August­
November
1992,
U.
S.
Geological
Survey
(USGS),
Open­
File
Report
96­
628,
1997.
[22
pp.]

7.
Conde­
Costes,
C.,
and
Gomez­
Gomez,
F.,
Assessment
of
Nitrate
Contamination
of
the
Upper
Aquifer
in
the
Manati­
Vega
Baja
Area,
Puerto
Rico,
USGS,
Water
Resources
Investigations
Report
99­
4040,
1999.
[49
pp.]

8.
Heisel,
J,
Gonzalez,
J.,
and
Cruz,
C.,
Analog
Model
of
the
North
Coast
Limestone
Aquifers,
Puerto
Rico,
USGS,
Open­
File
Report
82­
52,
1983.
[50
pp.]

9.
WESTON,
Logbook
No.
1,
Document
Control
No.
SAT.
022.001,
On­
site
Reconnaissance
conducted
at
the
Pesticide
Warehouse
III
site
in
Manati,
Puerto
Rico
by
the
Region
II
Site
Assessment
Team,
December
11,
2001.
[12
pp.]

10.
WESTON,
Logbook
No.
2,
Document
Control
No.
SAT.
022.002,
On­
site
Reconnaissance
conducted
at
the
Pesticide
Warehouse
III
site
in
Manati,
Puerto
Rico
by
the
Region
II
Site
Assessment
Team,
December
11,
2001.
[13
pp.]

11.
Capriglione,
M.,
WESTON,
Project
Note
to
Pesticide
Warehouse
III
file,
Subject:
Observations
Made
On
Site
at
Pesticide
Warehouse
III,
December
20,
2001.
[10
pp.]

12.
Foerter,
D.,
WESTON,
Project
Note
to
Pesticide
Warehouse
III
file,
Subject:
Qualified
Data
for
Dieldrin
and
Toxaphene
in
Soil
Samples
from
1996
SI
Report
for
Pesticide
Warehouse
III,
January
8,
2002.
[1
p.]

13.
Foerter,
D.,
WESTON,
Project
Note
to
Pesticide
Warehouse
III
file,
Subject:
Analytical
Ground
Water
Data
from
Reconnaissance
of
Ground­
Water
Quality
in
the
Manati
Quadrangle,
Puerto
Rico,
AugustNovember
1992,
U.
S.
Geological
Survey
(USGS),
Open­
File
Report
96­
628,
January
10,
2002.
[5
pp.]
5
SD­
Characterization
and
Containment
SOURCE
DESCRIPTION
2.2
SOURCE
CHARACTERIZATION
Number
of
the
source:
1
Name
and
description
of
the
source:
Contaminated
Soil
Source
Type:
Contaminated
Soil
Source
1
consists
of
contaminated
soil.
Site
operations
at
the
Pesticide
Warehouse
III
(PWIII)
site
included
the
mixing
of
water
and
pesticides,
herbicides,
or
fertilizers
(Ref.
4,
p.
2).
The
mixing
area
is
located
on
the
loading
platform
on
the
western
side
of
the
main
warehouse.
During
the
Site
Inspection
(SI)
on­
site
reconnaissance
conducted
by
EPA
in
March
1996,
significant
spillage
and
staining
of
soil
was
noted
adjacent
to
the
mixing
area.
Overflow/
spillage
was
noted
to
be
allowed
to
flow
to
the
ground
surface.
An
orange/
red
puddle
was
observed
near
the
northwest
corner
of
the
platform.
A
crystalline
film
coated
the
surface
of
this
puddle.
In
addition,
significant
spillage
of
liquid
pesticide,
herbicide,
fertilizer
mixture
and
powdered
forms
of
all
three
were
observed
on
top
of
the
platform.
Surface
drainage
from
the
entire
site
was
observed
to
be
to
the
northwest
corner
of
the
site.
White
crystals
lined
the
surface
runoff
pathway
from
the
mixing
area
across
the
entire
site
(Ref.
4,
p.
125,
129).

During
the
SI
sampling
event
conducted
by
EPA
in
May
1996,
surface
soil
samples
(depth:
0
to
6
inches)
were
collected
from
various
locations
throughout
the
PWIII
property.
Soil
samples
were
collected
from
the
area
of
the
loading
dock,
runoff
pathways
where
spillage
was
noted,
from
a
275­
foot
long
drainage
located
west
and
north
of
the
main
warehouse,
and
from
the
area
adjacent
to
an
aboveground
storage
tank
(AST)
located
east
of
the
main
warehouse
(Ref.
4,
pp.
136,
139­
143).
Analytical
results
of
these
samples
indicated
the
presence
of
several
pesticides
at
concentrations
significantly
above
concentrations
detected
in
background
samples
(Ref.
4,
pp.
22­
27).
Pesticides
detected
during
the
SI
sampling
event,
which
were
observed
to
be
stored
on
site
or
listed
in
Material
Safety
Data
Sheets
(MSDSs)
supplied
by
the
PWIII
site
manager,
include
Toxaphene,
Malathion,
Diuron,
and
Diazinon
(Ref.
4,
pp.
115,
508,
511,
515).
In
addition,
zinc
was
detected
in
on­
site
soil
samples
at
concentrations
significantly
greater
than
those
detected
in
background
soil
samples
(Ref.
4,
pp.
26­
27).
Zinc
sulfate
was
observed
to
be
stored
on
site
during
the
EPA
on­
site
reconnaissance
conducted
in
March
1996
(Ref.
4,
p.
127).
Dieldrin
was
also
detected
at
concentrations
significantly
greater
than
concentrations
detected
in
background
soil
samples
(Ref.
4,
pp.
22­
23).
Background
soil
samples
were
collected
west
of
the
site,
from
locations
deemed
by
the
field
crew
to
be
indicative
of
background
soil
conditions
(Ref.
4,
pp.
134,
142).

In
December
2001,
EPA
conducted
an
on­
site
reconnaissance
and
soil
field
screening
event
at
the
PWIII
site.
Pesticide
mixing
activities
continued
to
take
place
on
the
loading
platform
area
(Ref.
9,
p.
2).
Spillage
was
noted
throughout
the
property.
Stained
soil
was
also
noted
in
the
vicinity
of
the
loading
platform,
and
stressed
vegetation
was
observed
along
the
runoff
pathway
from
the
loading
platform
to
the
drainage
ditch
(Ref.
11,
pp.
1,
6).
In
addition,
material
from
white
plastic
bags
labeled
"UREA"
were
observed
to
be
spilling
from
the
loading
dock
directly
to
the
ground
(Ref.
11,
pp.
1,
8).
Field
screening
of
soil
was
conducted
utilizing
immunoassay
screening
methods
which
identify
pesticides.
Results
from
this
field
screening
event
confirmed
the
presence
of
pesticides
in
11
of
the
12
samples
collected
(Ref.
9,
pp.
9­
12;
11,
pp.
1,
6
).

During
the
December
2001
on­
site
reconnaissance,
a
3.5­
foot
high
embankment
was
observed
north
of
the
pineapple
fields
located
along
Route
670,
directly
across
from
the
PWIII
site.
Based
on
these
observations,
it
was
determined
that
drainage
from
the
pineapple
fields
would
not
migrate
to
the
PWIII
site
(Ref.
11,
pp.
1,
9).
6
SD­
Characterization
and
Containment
Location
of
the
source,
with
reference
to
a
map
of
the
site:

Contaminated
soil
areas
are
located
in
areas
located
east,
north
and
west
of
the
main
warehouse,
as
well
as
within
the
drainage
ditch
located
west
and
north
of
the
main
warehouse
(Ref.
4,
pp.
22­
27,
136).
The
approximate
locations
are
shown
in
Figure
2.

Containment
Release
to
ground
water:

There
are
no
known
containment
structures
(i.
e.,
engineered
cover,
run­
on
control
system,
runoff
management
system,
liners)
associated
with
source
1
(Ref.
4,
p.
125).
Based
on
an
evaluation
of
these
conditions,
a
containment
factor
of
10
is
assigned
(Ref.
1,
pp.
51595­
51596,
Section
3.1.2.1,
Table
3­
2).
7
SD­
Hazardous
Substances
Source
No.:
1
2.4.1
Hazardous
Substances
EPA
Site
Inspection
Soil
Samples:
30
May
1996
Hazardous
Substance
Evidence
Reference(
s)

Toxaphene+
SS01­
SS07,
SS11,
SS15
4,
pp.
22,
23
(max:
200,000J
ug/
kg
)
(max
bg:
12,000J
ug/
kg,
SS13)

Dieldrin
SS01,
SS02,
SS04,
SS05
4,
pp.
22,
23
(max:
3,600J
ug/
kg)
SS06
(max
bg:
79*
J
ug/
kg,
SS13)

Malathion+
SS01­
SS07,
SS09,
SS15
4,
pp.
24,
25
(max:
75
ug/
kg,
SS04)
(max
bg:
not
detected,
SS13)

Diuron+
SS01­
SS07,
SS10,
SS15
4,
pp.
24,
25
(max:
34,558***
ug/
kg,
SS03
(max
bg:
72.5
ug/
kg,
SS13)

Diazinon+
SS01­
SS07,
SS09,
SS10,
4,
pp.
24,
25
(max:
980**
ug/
kg,
SS11,
SS15
SS02)
(max
bg:
not
detected,
SS13)

Zinc+
SS01­
SS07,
SS09­
SS12
4,
pp.
26,
27
(max:
3,690
mg/
kg)
SS02)
(max
bg:
70
mg/
kg,
SS13)

ug/
kg
­
micrograms
per
liter
mg/
kg
­
milligrams
per
liter
J
­
Estimated
value;
Data
Validation
report
indicates
confirmed
presence
of
the
Toxaphene/
Dieldrin
(Ref.
12).
*
­
Value
was
transferred
from
a
dilution
analysis
**
­
Dilution
factor
was
50
times
***
­
Dilution
factor
was
100
times
max
bg
­
maximum
background
soil
concentration
+
­
Contaminant
also
observed
on
site
or
in
site
MSDSs
(Ref.
4,
pp.
111,
115,
508,
511,
515;
11,
pp.
1,
10)).
8
SD­
Hazardous
Waste
Quantity
Source
No.:
1
2.4.2
Hazardous
Waste
Quantity
2.4.2.1.1
Hazardous
Constituent
Quantity
The
information
available
is
not
sufficient
to
evaluate
Tier
A
source
hazardous
waste
quantity;
therefore,
hazardous
constituent
quantity
is
not
scored
(NS).

Hazardous
Constituent
Quantity
(C)
Value:
NS
2.4.2.1.2
Hazardous
Wastestream
Quantity
The
information
available
is
not
sufficient
to
evaluate
Tier
B
source
hazardous
waste
quantity;
therefore,
hazardous
wastestream
quantity
is
not
scored.

Hazardous
Wastestream
Quantity
(W)
Value:
NS
2.4.2.1.3
Volume
The
information
available
is
not
sufficient
to
evaluate
Tier
C
source
hazardous
waste
quantity;
therefore,
volume
(V)
is
assigned
a
value
of
0
(Ref.
1,
p.
51591,
Section
2.4.2.1.3).

Volume
(V)
Value:
0
2.4.2.1.4
Area
Because
there
are
soil
samples
showing
contamination
but
the
size
of
the
contaminated
area
has
not
been
determined,
the
area
is
considered
to
be
greater
than
0
square
feet
(Ref.
4,
pp.
22­
27,
136).
The
source
type
is
contaminated
soil,
so
the
area
value
is
divided
by
34,000
to
obtain
the
assigned
value,
as
shown
below
(Ref.
1,
p.
51591,
Section
2.4.2.1.4,
Table
2­
5).

Area
of
source
(ft
2
):
>0
Area
(A)
Assigned
Value:
(>
0)/(
34,000)
=
>0
2.4.2.1.5
Source
Hazardous
Waste
Quantity
Value
The
source
hazardous
waste
quantity
value
for
Source
1
is
>0
for
Tier
D
­
Area
(Ref.
1,
p.
51591,
Section
2.4.2.1.5).

Source
Hazardous
Waste
Quantity
Value:
>0
9
SD­
Characterization
and
Containment
SOURCE
DESCRIPTION
2.2
SOURCE
CHARACTERIZATION
Number
of
the
source:
2
Name
and
description
of
the
source:
Leach
Pit
Source
Type:
Surface
Impoundment
Source
2
is
a
leach
pit
located
in
the
rear
of
the
property;
north
of
the
main
warehouse
(Ref.
4,
p.
4;
Figure
2).
Runoff
from
on­
site
pesticide
mixing
operations
was
observed
to
collect
in
the
drainage
ditch
along
the
western
and
northern
property
boundary
(Ref.
4,
p.
12).
The
ditch
ends
in
the
leach
pit
(Ref.
4,
p.
4;
Figure
2).
This
unlined
pit
was
noted
to
have
the
appearance
of
a
vertical
shaft
(Ref.
5,
p.
9
).
During
the
SI
on­
site
reconnaissance
conducted
in
March
1996,
the
pit
was
noted
to
have
a
black
material
believed
to
be
spent
activated
carbon.
Puddled
water
was
also
noted
within
the
pit
(Ref.
4,
p.
128).

During
the
SI
sampling
event
conducted
in
May
1996,
a
soil
sample
(i.
e.,
SS08)
was
collected
from
the
leach
pit
(Ref.
4,
p.
141).
Analytical
results
from
this
sample
indicated
the
presence
of
several
pesticides
including
Toxaphene,
Malathion,
Diuron,
and
Diazinon
(Ref.
4,
pp.
22­
25).
Zinc
was
also
detected
in
this
sample
(Ref.
4,
pp.
26­
27).

During
the
on­
site
reconnaissance
conducted
by
EPA
in
December
2001,
a
soil
sample
was
collected
from
the
leach
pit.
Field
screening
of
this
soil
sample
was
conducted
utilizing
immunoassay
screening
methods
which
identify
pesticides.
Results
from
the
field
screening
confirmed
the
presence
of
pesticides
in
this
sample
at
an
estimated
concentration
exceeding
600
parts
per
billion
(ug/
kg)
(Ref.
9,
pp.
9­
12;
11,
pp.
1,
6
).

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

The
leach
pit
is
located
north
of
the
main
warehouse
(Ref.
4,
p.
136).
The
approximate
location
is
shown
in
Figure
2.

Containment
Release
to
ground
water:

There
are
no
known
containment
structures
(i.
e.,
liner,
diking,
leachate
collection
system)
associated
with
source
2
(Ref.
4,
p.
125).
Based
on
an
evaluation
of
these
conditions,
a
containment
factor
of
10
is
assigned
(Ref.
1,
pp.
51595­
51596,
Section
3.1.2.1,
Table
3­
2).
10
SD­
Hazardous
Substances
Source
No.:
2
2.4.1
Hazardous
Substances
EPA
Site
Inspection
Soil
Sample:
30
May
1996
Hazardous
Substance
Evidence
Reference(
s)

Toxaphene+
SS08
4,
pp.
22,
23
(18,000J
ug/
kg)

Malathion+
SS08
4,
pp.
24,
25
(38
ug/
kg)

Diuron+
SS08
4,
pp.
24,
25
(5,856**
ug/
kg)

Diazinon+
SS08
4,
pp.
24.
25
(190*
ug/
kg)

Zinc+
SS08
4,
pp.
26,
27
(579
mg/
kg)

ug/
kg
­
micrograms
per
kilogram
mg/
kg
­
milligrams
per
kilogram
J
­
Estimated
value,
Data
Validation
report
indicates
confirmed
presence
of
the
Toxaphene
(Ref.
12).

*
­
Dilution
Factor
was
10
times
**
­
Dilution
factor
was
50
times
***
­
Dilution
factor
was
100
times
max
bg
­
Maximum
background
concentration
+
­
Contaminant
also
observed
on
site
or
in
site
MSDSs
(Ref.
4,
pp.
111,
115,
508,
511,
515).

Note:
Based
on
the
fact
that
the
concentrations
detected
in
the
leach
pit
were
significantly
above
the
concentrations
of
background
soil
samples
collected
on
site,
it
appears
that
the
contamination
is
the
result
of
activities
that
have
occurred
on
site
(Ref.
4,
pp.
22­
27)
11
SD­
Hazardous
Waste
Quantity
Source
No.:
2
2.4.2
Hazardous
Waste
Quantity
2.4.2.1.1
Hazardous
Constituent
Quantity
The
information
available
is
not
sufficient
to
evaluate
Tier
A
source
hazardous
waste
quantity;
therefore,
hazardous
constituent
quantity
is
not
scored
(NS).

Hazardous
Constituent
Quantity
(C)
Value:
NS
2.4.2.1.2
Hazardous
Wastestream
Quantity
The
information
available
is
not
sufficient
to
evaluate
Tier
B
source
hazardous
waste
quantity;
therefore,
hazardous
wastestream
quantity
is
not
scored.

Hazardous
Wastestream
Quantity
(W)
Value:
NS
2.4.2.1.3
Volume
In
1996,
the
leach
pit
was
estimated
to
be
10
feet
long
by
15
feet
wide
and
10
feet
deep
(i.
e.,
1,500
cubic
feet)
(Ref.
4,
p.
12,
128).
In
December
2001,
the
leach
pit
was
re­
measured
and
determined
to
be
19.5
feet
long
by
13.5
feet
wide
by
10.8
feet
deep
(i.
e.,
2,843.1
cubic
feet)
(Ref.
10,
p.
11).
Based
on
the
December
2001
measurement,
this
equates
to
105.3
cubic
yards
(2,843.1/
27).
The
source
type
is
a
surface
impoundment,
so
the
volume
value
is
divided
by
2.5
to
obtain
the
assigned
volume
(V)
value
as
shown
below
(Ref.
1,
p.
51591,
Table
2­
5).

Dimension
of
source
(yd
3
):
105.3
Volume
(V)
Assigned
Value:
(105.3)/(
2.5)
=
42.12
2.4.2.1.4
Area
Since
the
volume
of
the
waste
source
can
be
determined,
a
value
of
0
is
given
for
area
measurement
(Ref.
1,
p.
51591).

Area
of
source
(ft
2
):
N/
A
Area
(A)
Assigned
Value:
0
2.4.2.1.5
Source
Hazardous
Waste
Quantity
Value
The
source
hazardous
waste
quantity
value
for
Source
2
is
22.22
for
Tier
C
­
Volume
(Ref.
1,
p.
51591).

Source
Hazardous
Waste
Quantity
Value:
42.12
12
SD­
Summary
SITE
SUMMARY
OF
SOURCE
DESCRIPTIONS
Containment
Source
Source
Hazardous
Waste
Ground
Surface
Air
Number
Quantity
Value
Water
Water
Gas
Particulate
1
>0
10NSNSNS
2
42.12
10
NS
NS
NS
NS
=
Not
Scored
13
GW­
General
3.0
GROUND
WATER
MIGRATION
PATHWAY
3.0.1
General
Considerations
The
site
is
underlain
by
aquifers
of
the
North
Coast
Limestone
Aquifer
System
(NCLAS).
The
NCLAS
is
an
important
source
of
ground
water
in
Puerto
Rico
and
consists
of
a
highly
karstified
carbonate
platform
of
middle
Tertiary
age.
The
aquifer
system
consists
of
three
main
hydrogeologic
units:
an
upper
aquifer
(Aymamon
Limestone
and
underlying
Aguada
Limstone)
and
a
lower
aquifer
(Lares
Limestone),
separated
by
a
confining
unit
(i.
e,
members
of
the
Cibao
Formation)
of
variable
thickness
(Ref.
4,
p.
450,
458).

The
aquifer
of
concern
in
this
report
is
the
upper
aquifer
of
the
North
Coast
Limestone
Aquifer
System
(NCLAS­
UP).
In
the
vicinity
of
the
PWIII
site,
the
NCLAS­
UP
consists
of
the
Aymamon
Limestone
and
the
underlying
Aguada
(Los
Puertos)
Limestone.
Together,
these
units
form
the
water­
table
aquifer
(Ref.
8,
p.
7).
The
NCLAS­
UP
is
the
principal
source
of
water
supply
in
the
Manati
area
(Ref.
6,
p.
1).
Based
on
the
well
log
from
a
test
hole
(i.
e.,
NC­
4)
located
in
the
vicinity
of
the
PWIII
site,
the
estimated
thickness
of
the
NCLAS­
UP
is
599
feet
(Ref.
4,
p.
576).
Available
information
indicates
that
the
hydraulic
conductivity
of
the
Aymamon
Limestone
ranges
from
2.01
x
10
­1
to
2.01
to
10
­2
centimeters
per
second
(cm/
sec)
(Ref.
4,
p.
29).
The
NCLAS­
UP
is
overlain
by
blanket
deposits
of
clayey
quartz
and
clayey
sand
(Ref.
4,
p.
459).
These
deposits,
which
have
an
estimated
hydraulic
conductivity
of
10
­6
cm/
sec,
were
determined
to
have
a
thickness
of
7.5
feet
on
the
PWIII
site
(Ref.
4,
p.
29;
10,
p.
11).
Based
on
water
level
measurements
from
the
on­
site
well
in
1992,
the
depth
to
ground
water
is
258
feet
below
ground
surface
(Ref.
6,
p.
5).

Ground
water
flow
within
the
NCLAS­
UP
in
the
vicinity
of
the
site
is
to
the
north
(Ref.
7,
pp.
18,
20).
However,
ground
water
movement
within
the
NCLAS­
UP
could
be
diverted
due
to
the
existence
of
vertical
conduits
and
solution
channels
which
occur
due
to
dissolution
of
limestone
(Ref.
9,
pp.
4­
5)
.
Evidence
of
karstic
features
in
the
vicinity
of
the
PWIII
site
include
geologic
depressions
(i.
e.,
sinkholes
and/
or
vertical
shafts),
with
the
closest
depression
being
the
on­
site
leach
pit
(i.
e.,
source
2),
located
north
of
the
main
warehouse
(Ref.
5,
p.
9;
7,
p.
13).
Other
karstic
features
in
the
vicinity
of
the
PWIII
site
include
conical
limestone
hills
(i.
e.,
magotes)
(Ref.
4,
p.
452;
7,
p.
13;
11,
p.
9).
Based
on
an
evaluation
of
these
conditions,
the
portion
of
the
NCLAS­
UP
beneath
sources
at
the
PWIII
site
is
evaluated
as
a
karst
aquifer.

UPPER
AQUIFER
Aquifer/
Stratum
1
(shallowest)

Stratum
Name:
Aymamon
Limestone
Description:
The
Aymamon
Limestone
is
generally
uniform
and
is
formed
by
thick
beds
of
almost
pure
limestone
of
early
Miocene
age
(Ref.
8,
p.
5).
In
the
vicinity
of
the
PWIII
site,
the
Aymamon
Limestone
has
an
estimated
thickness
of
375
feet
(Ref.
4,
pp.
576).
At
the
PWIII
site,
the
Aymamon
Limestone
is
overlain
by
a
sandy
clay
layer
with
a
thickness
of
approximately
7.5
feet
(Ref.
10,
p.
11).

Aquifer/
Stratum
2
Stratum
Name:
Aguada
(Los
Puertos)
Limestone
Description:
The
Aguada
Limestone
is
almost
entirely
limestone,
with
thick
to
massive
beds
of
calcarenite
alternating
with
beds
of
clayey
limestone
(Ref.
8,
p.
5).
In
the
vicinity
of
the
PWIII
site,
the
Aguada
Limstone
has
an
approximate
thickness
of
224
feet
(Ref.
4,
p.
576,
577).
14
GW­
General
CIBAO
FORMATION
Aquifer/
Stratum
3
Stratum
Name:
Unnamed
Upper
Member
(Aquiclude)

Description:
The
water­
table
aquifer
(i.
e.,
Upper
Aquifer
consisting
of
the
Aymamon
and
Aquada
Limestone)
is
underlain
by
the
unnamed
upper
member
of
the
Cibao
Formation,
which
acts
as
a
confining
unit
of
the
water­
table
aquifer
(Ref.
4,
pp.
459,
464).
This
unit
has
an
approximate
thickness
of
449
feet
in
the
vicinity
of
the
PWIII
site.
The
stratigraphy
of
this
unit
includes
239
feet
of
irregular
interbedded
claystone,
clayey
and
slightly
dolomitic
wackestone,
wackestone­
packstone,
and
packstone
bearing
oysters
and
benthic
foraminifera;
and,
210
feet
of
interbedded
marls
and
claystone,
with
minor
beds
of
clayey
wackestone
and
quartz
sandstone,
characterized
by
poor
to
locally
rich
benthic
foraminifera
fauna
(Ref.
4,
p.
578,
580).
A
multi­
zone
artesian
aquifer,
with
an
estimated
thickness
of
30
feet,
exists
in
the
lower
part
of
the
upper
member
of
the
unnamed
member
of
the
Cibao
Formation.
Beneath
this
artesian
aquifer,
another
confining
layer
exists
which
includes
the
lower
part
of
the
unnamed
upper
member
of
the
Cibao
Formation
as
well
as
the
two
underlying
units
of
the
Cibao
Formation
(see
below)
(Ref.
4,
pp.
578,
580)

Aquifer/
Stratum
4
Stratum
Name:
Undifferentiated
Quebradas
Arenas
and
Rio
Indios
Limestone
Members
(Aquiclude)

Description:
The
undifferentiated
Quebradas
Arenas
and
Rio
Indios
Limestone
Members
of
the
Cibao
Formation
consist
of
marl,
limestone
and
mudstone.
In
the
vicinity
of
the
PWIII
site,
this
unit
has
an
estimated
thickness
of
92
feet
(Ref.
4,
p.
578,
580).

Aquifer/
Stratum
5
Stratum
Name:
Unnamed
Mudstone
Unit
(Aquiclude)

Description:
The
unnamed
mudstone
unit
of
the
Cibao
Formation
consists
mostly
of
mudstone,
marl,
claystone,
and
minor/
clayey­
sandy
wackestone­
packstone.
In
the
vicinity
of
the
PWIII
site,
this
unit
has
an
estimated
thickness
of
450
feet
(Ref.
4,
pp.
578).

LOWER
AQUIFER
Aquifer/
Stratum
6
Stratum
Name:
Lares
Limestone
Description:
The
Lares
Limestone
consists
of
a
sequence
of
alternating
carbonite
and
siliciclastic
rocks
characterized
by
quartzlithic
arenites,
litharenites
irregularly
bedded
with
calcareous
siltstone
and
claystone,
marls
rich
in
planktonic
and
large
benthic
foraminifera
and
minor
amounts
of
packstone
and
grainstone
in
the
upper
part
(Ref.
4,
p.
578).
A
second
artesian
aquifer
was
encountered
in
a
test
hole
located
in
the
vicinity
of
the
PWIII
site.
The
Lares
Limestone
overlies
the
San
Sebastian
Formation,
which
acts
as
a
basal
confining
unit
(Ref.
4,
pp.
461,
578,
580).
15
GW­
Observed
Release
3.1
LIKELIHOOD
OF
RELEASE
3.1.1
Observed
Release
Aquifer
Being
Evaluated:
North
Coast
Limestone
Aquifer
System
­
Upper
Aquifer
In
1992,
ground
water
samples
were
collected
by
the
USGS
from
wells
in
the
Manati,
Puerto
Rico
area
(Ref.
6,
p.
1).
Toxaphene
was
detected
at
a
concentration
of
6.0
ug/
L
in
the
well
located
on
the
PWIII
site.
Toxaphene
was
not
detected
in
wells
located
upgradient
of
the
PWIII
site.
The
same
well
showed
dieldrin
at
a
level
of
approximately
0.24
ug/
L
(Ref.
6,
pp.
11,
14).
Background
wells
were
selected
based
on
their
locations
both
upgradient
of
the
PWIII
site
and
downgradient
of
the
pineapple
fields
located
south
of
Road
670
(Ref.
7,
pp.
6,
7,
20).
All
background
and
contaminated
samples
were
collected
from
the
aquifer
of
concern
(i.
e.,
Upper
Aquifer
of
the
North
Coast
Limestone
Aquifer
System).

Chemical
Analysis
Observed
releases
of
toxaphene
and
dieldrin
to
ground
water
are
documented
by
analytical
data
for
samples
collected
from
the
on­
site
well
in
1992
(Ref.
6,
pp.
5,
6,
11,
14).
Background
and
Contaminated
samples
were
analyzed
under
USGS
Method
NWQL
Schedule
1334
(Ref.
13).

Background
Concentrations
Sample
ID
Well
Location
Well
Depth
(ft)
Water
Depth
(ft)
Date
DateReference(
s)

6
Coto
Sur
#1
300
233
11/
5/
92
6,
pp.
5,
6,
8
9
Coto
Sur
#5
500
267
9/
14/
92
6,
pp.
5,
6,
8
10
Coto
Sur
#6
475
244
9/
15/
92
6,
pp.
5,
6,
8
Sample
ID
Hazardous
Substance
Conc
(ppb)
MRL
(ppb)
Reference(
s)

6
Toxaphene
not
detected
1
6,
pp.
11,
14
Dieldrin
not
detected
0.01
6,
pp.
11,
14
9
Toxaphene
not
detected
1
6,
pp.
11,
14
Dieldrin
0.06
0.01
6,
pp.
11,
14
10
Toxaphene
not
detected
1
6,
pp.
11,
14
Dieldrin
0.04
0.01
6,
pp.
11,
14
MRL
­
Minimum
Reporting
Level
Contaminated
Samples
Sample
ID
Well
Location
Well
Depth
(ft)
Water
Depth
(ft)
Date
Reference(
s)

11
Coto
Sur
WH
311
258
9/
18/
92
5,
p.
13,
6,
pp.
5,
6,
8
(i.
e.,
PWIII
well)

Sample
ID
Hazardous
Substance
Conc
(ppb)
MRL
(ppb)
Reference(
s)

11
Toxaphene
6.0
1
6,
pp.
11,
14
11
Dieldrin
0.24
0.01
6,
pp.
11,
14
16
GW­
Observed
Release
Attribution:

During
the
preliminary
assessment
reconnaissance
conducted
by
PREQB
in
April
1989,
drums
of
Toxaphene
E8
were
observed
to
be
stored
in
the
warehouse
(Ref.
4,
p.
115).
In
addition,
toxaphene
is
documented
to
have
been
used
by
the
Puerto
Rico
Land
Authority
as
part
of
their
"Pineapple
Program"
(Ref.
4,
pp.
105,
111).
During
several
inspections
of
the
site,
overflow/
spillage
was
noted
to
be
allowed
to
flow
to
the
ground
surface
in
the
area
of
the
loading
platform
on
site
(Ref.
4,
pp.
115,
125).
Analytical
results
of
soil
samples
collected
on
site
and
from
the
leach
pit
indicated
the
presence
of
toxaphene
at
estimated
concentrations
up
to
200,000J
ug/
kg.
These
concentrations
were
significantly
greater
than
concentrations
detected
in
background
soil
samples
(Ref.
4,
pp.
22,
23).
In
addition,
analytical
results
from
the
1992
USGS
ground
water
sampling
event
indicate
that
toxaphene
was
not
detected
above
MRLs
in
wells
located
immediately
upgradient
of
the
PWIII
site
(Ref.
6,
pp.
11,
14).

Dieldrin,
one
of
the
more
prevalent
organochlorine
pesticides
detected
throughout
Puerto
Rico,
was
detected
in
on­
site
soils
and
the
leach
pit
at
estimated
concentrations
up
to
3,600
ug/
L
(Ref.
4,
pp.
22,
23,
136;
7,
p.
18).
These
concentrations
were
significantly
greater
than
concentrations
detected
in
background
soil
samples
(Ref.
4,
pp.
22,
23,
136).
In
addition,
analytical
results
from
the
1992
USGS
ground
water
sampling
event
indicated
that
dieldrin
was
detected
in
the
PWIII
well
at
a
concentration
significantly
greater
than
concentrations
detected
in
the
nearest
upgradient
wells
(Ref.
6,
pp.
11,
14).
Background
wells
were
selected
based
on
their
locations
both
upgradient
of
the
PWIII
site
and
downgradient
of
the
pineapple
fields
located
south
of
Road
670
(Ref.
7,
pp.
6,
7,
20).

Although
nearby
pineapple
farms
use
pesticides
and
fertilizers,
ground
water
wells
located
between
the
site
and
these
fields
had
no
detection,
or
significantly
lower
detections,
of
pesticides
in
comparison
to
data
from
the
PWIII
well
(Ref.
6,
pp.
11,
14).
Since
the
concentrations
of
toxaphene
and
dieldrin
detected
in
on­
site
soils,
and
in
the
immediate
ground
water
of
the
site,
were
significantly
above
respective
background
concentrations,
an
observed
release
of
toxaphene
and
dieldrin
directly
attributable
to
the
PWIII
site
has
been
established.
(Ref.
4,
pp.
22­
27)

Hazardous
Substances
Released:

Toxaphene
Dieldrin
===================================================================================
Ground
Water
Observed
Release
Factor
Value:
550
17
GW­
Containment
3.1.2
Potential
to
Release
3.1.2.1
Containment
Source
Descriptor
Value
1­
Contaminated
No
Liner,
No
Maintained
Engineered
Cover,
10
Soil
No
Run­
on
Control/
Runoff
Management
System
There
are
no
known
containment
structures
(i.
e.,
engineered
cover,
run­
on
control
system,
runoff
management
system,
liners)
associated
with
source
1
(Ref.
4,
p.
125).
Based
on
an
evaluation
of
these
conditions,
a
containment
factor
of
10
is
assigned
(Ref.
1,
pp.
51595­
51596,
Section
3.1.2.1,
Table
3­
2).

Source
Descriptor
Value
2­
Surface
No
Liner,
Diking,
Leachate
Collection
System
10
Impoundment
There
are
no
known
containment
structures
(i.
e.,
liner,
diking,
leachate
collection
system)
associated
with
source
2
(Ref.
4,
p.
125).
Based
on
an
evaluation
of
these
conditions,
a
containment
factor
of
10
is
assigned
(Ref.
1,
pp.
51595­
51596,
Section
3.1.2.1,
Table
3­
2).

====================================================================================
Containment
Factor
Value:
10
18
GW­
Net
Precipitation
GW­
Depth
to
Aquifer
3.1.2.2
Net
Precipitation
The
net
precipitation
factor
for
the
PWIII
site
was
obtained
from
Figure
3­
2
of
the
HRS
Rule
(Ref.
1,
p.
51598).
This
figure
indicates
that
the
entire
island
of
Puerto
Rico
receives
a
Net
Precipitation
Factor
Value
of
10
Factor
Value:
10
3.1.2.3
Depth
to
Aquifer
Source
1
­
Contaminated
Soil
Based
on
the
water
level
of
the
on­
site
well,
the
depth
to
the
aquifer
is
approximately
258
feet
(Ref.
6,
p.
5).
The
lowest
point
of
hazardous
substances
at
the
site
is
for
contaminated
soil
is
6
inches
(i.
e.,
0.5
feet)
below
ground
surface
(Ref.
4,
pp.
22,
134).
The
depth
from
the
ground
surface
to
the
top
of
the
upper
aquifer
of
the
North
Coast
Limestone
Aquifer
System
is
approximately
7.5
feet
(Ref.
10,
p.
11).
Sources
at
the
site
are
above
karst
formations
(see
Section
3.0.1).
The
HRS
states
that
in
evaluating
the
depth
to
aquifer
in
karst
terrain,
assign
a
thickness
of
0
feet
to
a
karst
aquifer
that
underlies
any
portion
of
sources
at
the
site.
Therefore,
the
depth
to
aquifer
for
Source
1
is
7
feet.
Based
on
this
information,
a
depth
to
aquifer
factor
value
of
5
is
assigned
for
Source
1
(i.
e.,
contaminated
soil)
(Ref.
1,
p.
51600,
Table
3­
5).

Source
2
­
Leach
Pit
Based
on
the
water
level
of
the
on­
site
well,
the
depth
to
the
aquifer
is
approximately
258
feet
(Ref.
6,
p.
5).
The
lowest
point
of
hazardous
substances
at
the
site
is
for
the
leach
pit
10.8
feet
below
ground
surface
(Ref.
10,
p.
11).
The
depth
from
the
ground
surface
to
the
top
of
the
upper
aquifer
of
the
North
Coast
Limestone
Aquifer
System
is
approximately
7.5
feet
(Ref.
10,
p.
11).
Sources
at
the
site
are
above
karst
formations
(see
Section
3.0.1).
The
HRS
states
that
in
evaluating
the
depth
to
aquifer
in
karst
terrain,
assign
a
thickness
of
0
feet
to
a
karst
aquifer
that
underlies
any
portion
of
sources
at
the
site.
Therefore,
the
depth
to
aquifer
for
Source
2
is
0
feet.
Based
on
this
information,
a
depth
to
aquifer
factor
value
of
5
is
assigned
for
Source
2
(i.
e.,
leach
pit)
(Ref.
1,
p.
51600,
Table
3­
5).

Based
on
the
above
information,
a
depth
to
aquifer
factor
value
of
5
is
assigned.

====================================================================================
Net
Precipitation
Factor
Value:
10
Depth
to
Aquifer
Factor
Value:
5
19
GW­
Travel
Time
3.1.2.4
Travel
Time
The
depth
to
aquifer
is
less
than
10
feet
(see
Section
3.1.2.3).
In
addition,
all
layers
underlying
on­
site
sources
are
karst
(see
Section
3.0.1).
Based
on
this
information,
a
travel
time
factor
value
of
35
is
assigned
(Ref.
1,
p.
51600).

====================================================================================
Travel
Time
Factor
Value:
35
20
GW­
Toxicity/
Mobility
3.2
WASTE
CHARACTERISTICS
3.
2.
1
Toxicity/
Mobility
Hazardous
Source
Toxicity
Mobility
Toxicity/
Substance
Numbers
Factor
Value
Factor
Value
Mobility
Reference(
s)

Toxaphene
1,
2
1,
000
1.0
1,
000
2,
p.
B­
19
Malathion
1,
2
100
1.0
100
2,
p.
B­
13
Diuron
1,
2
1,
000
1.0
1,
000
2,
p.
B­
9
Diazinon
1,
2
1,
000
1.0
1,
000
2,
p.
B­
7
Zinc
1,
2
10
1.
0
10
2,
p.
B­
20
Dieldrin
1
10,000
1.0
10,000
2,
p.
B­
8
====================================================================================
Toxicity/
Mobility
Factor
Value:
10,
000
21
GW­
Waste
Characteristics
3.2.2
Hazardous
Waste
Quantity
Source
Hazardous
Is
source
hazardous
Waste
Quantity
(HWQ)
constituent
quantity
Source
Number
Value
(Section
2.4.2.1.5)
data
complete?
(yes/
no)

1
>0
No
2
42.12
No
Sum
of
Values:
42
(rounded
to
nearest
integer
as
specified
in
HRS
Section
2.4.2.2)

The
sum
corresponds
to
a
hazardous
waste
quantity
factor
value
of
1
in
Table
2­
6
of
the
HRS
(Ref.
1,
p.
51591).
However,
based
on
the
fact
that
targets
are
not
subject
to
Level
I
or
Level
II
concentrations
and
no
EPA
removal
action
has
been
completed,
a
hazardous
waste
quantity
factor
value
of
10
can
be
assigned
if
it
is
greater
than
the
hazardous
waste
quantity
value
from
Table
2­
6
(i.
e.,
1).
Therefore,
a
hazardous
waste
quantity
factor
value
of
10
is
assigned
for
the
ground
water
pathway.

3.2.3
Waste
Characteristics
Factor
Category
Value
Dieldrin
correspond
to
the
toxicity/
mobility
factor
value
of
10,000,
as
shown
previously
(see
Section
3.2.1).

Toxicity/
Mobility
Factor
Value
(10,000)
x
Hazardous
Waste
Quantity
Factor
Value
(10):
1
x
10
5
The
product
1
x
10
5
corresponds
to
a
Waste
Characteristics
Factor
Category
Value
of
18
in
Table
2­
7
of
the
HRS
(Ref.
1,
p.
51592).

====================================================================================
Hazardous
Waste
Quantity
Factor
Value:
10
Waste
Characteristics
Factor
Category
Value:
18
22
GW­
Targets
3.3
TARGETS
Based
on
the
current
United
States
Geological
Survey
(USGS)
records,
21
public
supply
wells
exist
within
4
miles
of
the
PWIII
site,
as
listed
below
(Ref.
5,
p.
1).
In
addition,
to
the
active
public
supply
wells
listed
below,
USGS
indicated
that
many
stand­
by
wells
also
exist
within
the
target
distance
limit
(Ref.
5,
p.
9).

Distance
Level
I
Level
II
Potential
from
Contam.
Contam.
Contam.
Well
Source
(mi.)*
Aquifer
(Y/
N)
(Y/
N)
(Y/
N)
Reference(
s)

Coto
S
ur
5
0.
31
m
ileNCLAS­
UPN
N
Y
5,
p
p.
1
,
7
,
9
Tri­
Line0.
71
m
ileNCLAS­
UPN
N
Y
5,
p
p.
1
,
7
,
9
Atenas0.
89
m
ileNCLAS­
UPN
N
Y
5,
p
p.
1
,
7
,
9
Escarfullery1.
56
m
ilesNCLAS­
UPN
N
Y
5,
p
p.
1
,
7
,
9
Coto
S
ur
4
1.
80
m
ilesNCLAS­
UPN
N
Y
5,
p
p.
1
,
7
,
9
Cordova
D
avila1.
81
m
ilesNCLAS­
UPN
N
Y
5,
p
p.
1
,
7
,
9
Manati
32.
23
m
ilesNCLAS­
UPN
N
Y
5,
p
p.
1
,
7
,
9
Manati
12.
80
m
ilesNCLAS­
UPN
N
Y
5,
p
p.
1
,
7
,
9
Rabanos2.
72
m
ilesNCLAS­
UPN
N
Y
5,
p
p.
1
,
7
,
9
Manati
23.
03
m
ilesNCLAS­
UPN
N
Y
5,
p
p.
1
,
7
,
9
Pugnado
A
fuera
23.
12
m
ilesNCLAS­
UPN
N
Y
5,
p
p.
1
,
7
,
9
Ciudad
R
eal3.
01
m
ilesNCLAS­
UPN
N
Y
5,
p
p.
1
,
7
,
9
Cruz
Rosa
R
ivas3.
03
m
ilesNCLAS­
UPN
N
Y
5,
p
p.
1
,
7
,
9
Pugnada
A
fuera
1
3.
30
m
ilesNCLAS­
UPN
N
Y
5,
p
p.
1
,
7
,
9
Algorrobo3.
35
m
ilesNCLAS­
UPN
N
Y
5,
p
p.
1
,
7
,
9
Rio
A
rriba
2
2.
85
m
ilesNCLAS­
UPN
N
Y
5,
p
p.
1
,
7
,
9
Rio
A
rriba
3
2.
94
m
ilesNCLAS­
UPN
N
Y
5,
p
p.
1
,
7
,
9
Alt.
V
ega
B
aja3.
68
m
ilesNCLAS­
UPN
N
Y
5,
p
p.
1
,
7
,
9
Boquillas
3.
37
miles
NCLAS­
UP
N
N
Y
5,
p
p.
1
,
7
,
9
Vega
B
aja
2
3.
76
m
ilesNCLAS­
UPN
N
Y
5,
p
p.
1
,
7
,
9
Vega
B
aja
3
3.
90
m
ilesNCLAS­
UPN
N
Y
5,
p
p.
1
,
7
,
9
*
­
Distance
of
wells
measured
from
the
main
warehouse
building
of
the
PWIII
site,
which
was
where
mixing
and
spillage
of
pesticides
to
ground
surface
occurred.
Well
locations
are
presented
in
Figure
3.

NCLAS­
UP
­
North
Coast
Limestone
Aquifer
System
­
Upper
Aquifer
23
GW­
Nearest
Well/
Population
3.3.1
Nearest
Well
Well:
Coto
Sur
No.
5
Coto
Sur
No.
5
is
a
public
supply
well
located
approximately
0.31miles
east
of
the
PWIII
site
(Ref.
5,
p.
7;
Figure
3).
Although
some
of
these
wells
show
contamination,
no
drinking
water
wells
are
scored
to
Level
I
or
Level
II
as
attribution
to
the
site
has
not
fully
been
established
at
this
point
in
the
investigation.
In
addition,
the
North
Coast
Limestone
Aquifer
System­
Upper
aquifer
is
a
karst
aquifer
underlying
on­
site
sources,
and
wells
within
the
target
distance
limit
draw
water
from
this
karst
aquifer
(Ref.
4,
p.
450;
5,
pp.
8,
9).
Based
on
this
information,
a
nearest
well
factor
value
of
20
is
assigned
(Ref.
1,
p.
51603,
Table
3­
11).

Level
of
Contamination
(I,
II,
or
potential):
Potential
====================================================================================
Nearest
Well
Factor
Value:
20
3.3.2
Population
3.3.2.2
Level
I
Concentrations
Level
I
Well
Population
Reference(
s)

Not
Applicable
(N/
A)
N/
A
N/
A
====================================================================================
Population
Served
by
Level
I
Wells:
0
Level
I
Concentrations
Factor
Value:
0
3.3.2.3
Level
II
Concentrations
Level
II
Well
Population
Reference(
s)

N/
A
N/
AN/
A
====================================================================================
Population
Served
by
Level
II
Wells:
0
Level
II
Concentrations
Factor
Value:
0
24
GW­
Potential
Contamination
3.3.2.4
Potential
Contamination
Based
on
current
USGS
records,
public
supply
wells
within
4
miles
of
the
site
withdraw
water
from
the
upper
aquifer
of
the
North
Coast
Limestone
Aquifer
System
(Ref.
5,
pp.
7,
9).
Therefore,
the
ground
water
populations
within
a
4­
mile
radius
are
considered
to
be
potential
targets.

Distance
Potential
Distance­
Weighted
Category
Population
Population
Value
0
to
¼
mile
0
0
>¼
to
½
mile
3,888
3,233
>½
to
1
mile
5,358
2,607
>1
to
2
mile
11,664
8,163
>2
to
3
mile
30,826
26,068
>3
to
4
mile
58,662
26,068
Sum
of
Distance­
Weighted
Population
Values:
66,139
Ref.
1,
p.
51604;
5,
pp.
4­
5
====================================================================================
Potential
Contamination
Factor
Value:
6,614
25
GW­
Resources/
Wellhead
Protection
Area
3.3.3
Resources
Wells
located
within
the
4­
mile
radius
of
the
PWIII
site
are
designated
as
livestock
wells
and
used
for
the
watering
of
commercial
livestock
(Ref.
5,
p.
9;
6,
pp.
5,
6).
Therefore,
the
resources
factor
value
is
5
(Ref.
1,
p.
51604).

====================================================================================
Resources
Factor
Value:
5
3.3.4
Wellhead
Protection
Area
The
Wellhead
Protection
Areas
Program
for
Puerto
Rico
was
finalized
by
the
PREQB
and
approved
by
EPA
in
1991.
All
public
supply
wells
are
included
in
this
program.
PREQB
is
in
the
process
of
verifying
well
locations
utilizing
a
Global
Positioning
System
(GPS)
and
conducting
a
Phase
I
delineation
process
within
a
1,500­
foot
radius
of
each
well
after
GPS
verification
(Ref.
4,
p.
588).
The
closest
potable
well
is
Coto
Sur
No.
5,
which
is
located
approximately
0.31
mile
(i.
e.,
1,637
feet)
east
of
the
PWIII
site
(Ref.
5,
p.
7;
Figure
3).
Therefore,
the
nearest
wellhead
protection
area
is
located
approximately
137
feet
from
the
PWIII
site
(i.
e.,
1,637
foot
distance
of
site
from
Coto
Sur
5
minus
the
1,500­
foot
radius
around
the
Coto
Sur
5
well).
Based
on
this
information,
there
are
wellhead
protection
areas
within
the
target
distance
limit
of
the
PWIII
site.
Therefore,
a
wellhead
protection
area
factor
value
is
5
is
assigned
(Ref.
1,
p.
51604).

====================================================================================
Wellhead
Protection
Area
Factor
Value:
5