Document ID: EPA-HQ-SFUND-2002-0002-0083
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2002-09-03T04:00Z

SFUND­
2001­
0009­
0014
HAZARD
RANKING
SYSTEM
(HRS)
DOCUMENTATION
RECORD
­
REVIEW
COVER
SHEET
Name
of
Site:

Contact
Persons:
McGaffey
and
Main
Groundwater
Plume
SiteInvestigationGeorge
­
Schuman.
NMED.
Proaam
Manager
(505)
827­
2922
mame>
(Phone)

DocumentationRecord:
BrendaNixonCook.
EPANPLCoordinator
(214)
665­
7436
mame)
(Phone)

Pathwavs.
Components.
or
Threats
Not
Scored
1)
SurfaceWaterPathway:
Thesurfacewaterpathwayhasnotbeenscoredbecausethereisno
overland
flow
segment
or
flood
potential
for
the
site.
Based
on
available
information,
evaluation
­
'
of
the
surface
water
pathway
would
not
significantly
affect
the
overall
site
score.

Soil
Exposure:
The
New
Mexico
hvimntnent
Department
(NMED)
conducted
a
limited
shallow
soil
vapor
study
in
the
source
.area
m
1995.
During
this
study,
small
bore
holes
were
installed
to
depths
of
approximately
2
to
3
feet
below
ground
surface
(bgs).
PCE
concentrations
were
then
measured
m
thevadosezone.
The
results
revealeda
high
concentrationofPCElocated
immediately
south
of
the
source
area
(Ref.
4,
p.
6).
A
nested
soil
vapor
well
was
later
installed
in
October
1995
as
a
result
of
the
initial
soil
vapor
investigation
PCE
concenbdions
measured
in
.the
vapor
samples
ranged
fiom
340
parts
per
million
volume/
volume
(ppm
ViV)
at
6
feet
bgs
and
increased
to
1,600
ppm
VN
at
38
feet
bgs
(Ref
4,
p.
6).

The
soil
exposure
pathway
has
not
been
scored
because
no
area
of
surface
soil
contamination
has
been
identified
for
the
site.

3)
Air
Pathway:
The
air
migration
pathway
has
not
been
scored
because
an
observed
release
to
the
air
migration
pathway
has
not
been
documented
for
the
site.
Based
on
available
information,
evaluation
of
the
air
migration
pathway
would
not
significantly
affect
the
o
v
d
site
score.

HRS
Documentation
Record
05/
30/
01
1
McGaffey
and
Main
Gmundwater
Plume
NM0000605386
HRS
DOCUMENTATION
RECORD
NameofSite:
McGaffeyandMainGrpundwaterPlume
CERCLIS
Site
ID
No.:
''
'
NM0000605386
EPA
Region:
6
Date
County
and
State:

General
Location
within
the
State:

Topographic
Map(
s):

Latitude:

i
,>

Longitude:
Chaves
County,
New
Mexico
Thesite
is
located
in
the
City
of
Roswell,
Chaves
County,
New
Mexico.
Roswell
is
located
in
the
Southeastern
portion
of
the
state
of
New
Mexico.

The
following
U.
S.
Geological
Survey
(USGS)
7.5­
minute
topographic
series
map(
s)
were
used
m
locating
the
site:
Rosivell
North,
New
Mexico
and
Roswell
South,
New
Mexico
(Ref.
3,
pp.
1­
2):

3
3
0
22'
47.25"
North
(as
measured
from
the
intersection
of
McGaffey
and
Main
Streets)
(Ref
3,
p.
3).

1040
3
1'
7.40"
West
.(
as
measured,
from
the
intersection
of
McGaffey
and
Main
Streets)
(Ref.
3
;
p.
3).
.,
'
,

...

Scores
Aii.
Pathway
Not
Scored
Ground
Water
Pathway
100
Soil
Exposure
Pathway
Not
Scored
Swface
Water
Pathway
Not
Scored
HRS
SITE
SCORE
50
HRS
Documentation
Record
05/
30/
01
2
McGaffey
and
Main
Groundwater'Plume
NM0000605386
NOTES
TO
THE
READER
I
.
For
thepurposesofthisHazardRanking
System(
HRS)
DocumentationRecord,
aplumeofcontaminated
ground
water
has
been
identified
in
Roswell,
Chaves
County,
New
Mexico.
The
boundary
of
the
plume
is
defined
by
ground
water
samples
from
domestic
wells,
monitoring
wells,
and
municipal
supply
wells
that
meet
observed
release
criteria
under
the
HRS.
The
site
has
been
evaluated
as
a
ground
water
plume
attributable
to
a
source.

2.
Thefollowingruleswereappliedwhencitingreferencesin
this
Documentation
Record
A.
Trackingnumbers
are
assigned
by
theRegiontoeverypageofeveryreference.
Thetracking
number
consists
of
the
reference
number
followed
by
the
page
number
within
that
reference.
A
tracking
number
has
a
two­
digit
number
followed
by
the
sequential
number
(e.
g.,
040001,
040002,
etc.).

B.
If
the
reference
has
an
original
page
number,
that
page
number
was
cited.

C.
If
thereferencecitedhasnooriginalpagenumber
or
thepaginationisnotcomplete,
thenthe
designated
tracking
number
was
cited.

D.
Analyticaldataarereferencedbytrackingnumberonly.

3.
Hazardous
substances
are
listed
by
the
names
used
in
the
June
1996
SuperfundChemicalDataMa&
(SCDM)
(Reference
2).
It
should
be
noted
that
perchloroethylene
is
commonly
referred
to
as
PCE.
Synonymsforperchloroethylenemclude:
tetrachloroethylene,
tetrachloroethene,
andperc.
These
distinctiods
have
been
made
because
some
reports
and/
or
analytical
data
may
refer
to
this
substance
in
one
ofthese
manners.

4.
AttachmentAof
this
DocumentationRecordconsistsofthefollowingfigures:

e
A­
1
Site
Location
Map
e
A­
2
Well
Location
Map
0
A­
3
Level
I/
Level
I1
Targets
and
Estimated
Extent
of
Plume
Map
HRS
Documentation
Record
05/
30/
01
3
McGaiTey
and
Main
Groundwater
Plume
NM0000605386
REFERENCES
CITED
1.
40CFRPart300,
HazardRankingSystem;
FinalRule.
14December1990.
Volume55,
No.
241.

2.
U.
S.
EnvironmentalProtectionAgency(
USEPA):
1996.
S
u
p
e
h
d
ChemicalDataMatrix(
SCDM).
June
1996.

3.
U.
S.
Geological
Survey
(USGS).
1962;
Photorevised
in
1975.
Roswell
North
and
Roswell
South,
New
Mexico
(7.5­
minute
topographic
series
maps)
and
Latitude
and
Longitude
Calculation
Worksheet.
Total
pages:
3.
..

4.
NewMexicoEnvironmentDepartment(
NMED).
Tetrachloroethene(
PCE)
Contamination
of
Ground
Water,
McGaffey
and
Main,
South
Roswell,$
New
Mexico.
,.
Total
Pages:
84.

5.
NMED.
1995.
EmergencyAbatementProposalfor"
Orphan"
Water­
PollutionSites.
3
February1995.
Total
Pages:
8.

6.
NMED.
1995.
Memorandum­
to
Mr.
MarkE.
Weidler,
EnvironmentalSecretaryfortheState
ofNew
Mexico.
Subject:
Roswell
PCE
Investigation
Workplan.
10
February
1995.
Total
Pages:
6.

7.
NMED.
1995and2000.
NotificationstoRoswellResidents
of
PCEContamination.
Februaryand
March
1995
and
21
Novernber
2000.
Total
Pages:
9.

8.
NMED.
1995.
Letterto
Mr.
DavidHarries,
SecretaryofFinanceandAdministration,
StateofNew
Mexico.
Subject:
Emergency
Funding
for'Alternate
Water
Supply.
6
February
1995.
Total
Pages:
2.

9.
NMED.
1998.
SouthRoswellPCESiteGroundWaterMonitoringReport.
1998..
TotalPages:
15.

10:
US.
EnvironmentalProtectionAgency(
USEPA).
1992.
yazard
RankingSystem
Gdance
Manuak
Interim
Final
(excerpts).
November
1992.
Total
Pages:
4.

1
1.
State
ofNew
MexicoDepartmentofHealth.
1994
to
1995.
Laboratory
Analytical
Reports.
December
1994
through
December
1995.
Total
Pages:
,139.

12.
State
ofNew
MexicoDepartment
of
Health.
1998.
LaboratoryAnalyticalReports.
October1998.
Total
Pages:
26.

13.
State
ofNew
MexicoDepartment
of
Health.
1999.
LaboratoryAnalyticalReports.
May1999.
Total
Pages:
45..
8:"
.
­

HRS
Documentation
Record
05130101
McGaffey
and
Main
Groundwater
Plume
NM0000605386
14.
StateofNewMexicoDepartmentofHealth.
2000.
LaboratoryAnalyticalReports.
April2000and
September
2000.
Total
Pages:
72.

1
5.
State
ofNew
Mexico
Department
of
Health.
200
1
.
Laboratory
Analmcal
Reports.
March
200
1.
Total
Pages:
48.

1
6.
State
ofnew
Mexico
Department
of
Health.
2001.
Laboratory
Analytical
Reports.
April,
January,
and
February
1995;
July
1996;
May
1999;
and
October
2000.
Total
Pages:
24.

17.
StateofNewMexicoDepartmentofHealth.
1992
through
1999.
LaboratoryAnalyticalReportsfor
the
City
of
Roswell
Municipal
Supply
Wells.
April
1992
through
October
1999.
Total
Pages:
37.

18.
New
MexicoWaterResourcesResearchInstitute,
1982.
"The
Carbonate
Aquifer
of
the
Central
RoswellBasin:
Recharge
EstimationbyNumericalModeling(
excerpts)."
Report
NO.
142.
February1982.
TotalPages:
16.

19.
USGS.
2001.
GroundWaterAtlasoftheUnitedStates.
"Carbonate­
rock
Aquifers"
and
"Roswell
Basin
Aquifer
System
articles.
February2001.
TotalPages:
22.

20.
Atkins
Engineering
Associates,
Inc.
1994.
Limited
Site
Investigation
Report
for
the
Heritage
Investments
Phase
11.
28
October
1994.
Total
Pages:
57.

2
1.
Kambhu.
A.
20Q1.
WESTON.
PersonalCommunicationwith
Mr.
JimEdwards,
Manager,
Ro,
well
Municipal
Water
System..
Subject:
Roswell
Municipal
Supply
Wells
and
Figures.
07
June
2001.
Total
Pages:
6.

22.
HalogenatedSolventsIndustry
Alliance,
Inc.
(
HSIA).
1999.
Perchloroethylene.
WhitePaper.
November1999.
TotalPages:
7.

23.
U.
S.
Department
ofcommerce.
2001.
US.
Census
Bureau:
2000
Population
and
Housing
Infomation.
30
June
2001.
Total
Pages:
3.

24.
,
EnvironmentalImprovementDivision,
New
MexicoHealthandEnvironmentDepartment.
I
1990.
Wellhead
Protection
Program
for
the
State
of
New
Mexico.
Total
Pages:
2.

HRS
Documentation
Record
05/
30/
01
5
McGaffey
and
Main
Groundwater
Plume
NM0000605386
SITE
SUMMARY
The
McGaffey
and
Main
Groundwater
Plume
site
is
located
Roswell,
Chaves
County,
New
Mexico,
88201
near
the
intersectionof
SouthMain
Street
and
McGaffey
Street
inan
area
ofmixedcommercialand
industrialuse.
Residential
areas
are
located
further
southofthesite
(Ref.
3,
pp.
1­
2).
Essentially,
thereisnoopenor
undeveloped
land
within
the
immediate
vicinity
ofthe
site
(Ref
3,
pp
.I
­2).
The
site
consists
of
perchloroethylene
(PCE)
contamination
that
has
been
identified
throughout
the
upper
aquifer
as
a
ground
water
plume
that
extends
for
approximately
one
mile
in
a
southeasterly
directioh
(Ref
5,
p.
2;
Ref
9,
p.
3).

The
boundary
of
the
ground
water
plume
is
defined
by
groimd
water
samples
kom
domestic,
monitoring,
and
municipal
supply
wells.
The
precise
extent
of
the
plume
has
not
yet
been
identified,
but
appears
to
measure
approximately
one
mile
in
length
(Ref
5
,
p
.2).
There
q
e
additional
ground
water
plumes
in
the
vicinity,
however,
only
one
ground
water
plume
has
been
consid&
ed
for
the
puiposes
of
this
documentation
record
since
it
is
not
known
at
this
time'whether
the
PCEfound
M
e
r
down­
went
of
this
site
is
commingled
or
otherwise
related
to
this
p
h
e
(Ref.
6,
p.
3.;
Ref.
8,
p.
2).
The
evidence.
gathered
to
date
appears
to
pqoint
a
former
dry
cleaning
facility
as
the
most
likely
source
of
the
PCE
contap&
ation
(Ref
4,
p.
6;
Ref.
9,
p:
10).

The
New
Mexico
Environment
Department
­Dl
has
been
the
primary
agency
involved
in
the
investigation
of
this
ground
water
plume.
The
NMED
discovekd
the
grouniwater
plume
in
November
B
994
following
the
investigation
of
a
leaky
underground
storage
tank
at
the
former
Pepsi
Cola
bottling
plant
(Ref
4,
p.
3;
Ref
20,
p.
3).
Ground
water
samples
collected
from
moIiito&
g
wells
installed
as
part
of
the
investigation
conducted
at
the
former
bottling
plant
revealed
the
presence
o
f
w
concentrations
of
PCE
and
gasoline
ConstikJents.
The
highest
concentrations
ofPCE
were
observed
across
Southhkin
Street
fi­
omthe
former
bottling
plant,
in
anarea
referred
to
as
the
Highland
Center
(Ref
4,
p.
3).
'
~

A
large
dry
cleaning
facility
occupied
a
buildmg
located
at
I
107
South
Main
Street
of
the
Highland
Center
(Ref
4,
p.
3).
Records
show
that
the
dry
cleaning
facility
operated
from
1956
until
1963.
The
dry
cleaning
facility
was
known
by
the
name
of
Lee
Mack
Laundry
and
Dry
Cleaners
(Lee
Mack
Cleaners)
and
ceased
operation
some
time
in
1963
(Ref.
4,
p.
3;
Ref.
20,
p.
4).
The
owner
ofthe
dry
cleaning
facility
is
currently
deceased
(Ref
5,
p.
1)­

Extremely
hgh
concentmtions
of
PCE
in
a
monitoring
well
located
approximately
40
feet
southeast
ofthe
former
dry
cleaning
fxilityindicate
that
past
d~
posal
practices
at
the
dry
cleaning
fxilitymayhave
includmg
discharging
waste
PCE
behind
the
facility
(Ref.
6,
p,
1).
PCE
has
been
detected
in
this
well
at
concentrations
up
to
25,000
micrograms
per
liter
(ug/
L)
(Ref
5,
p.
1
;
Ref
6,
p.
I).
During
a
site
investigation
in
1994,
following
a
review
of
the
locations
of
the
PCE
plume
and
the
local
dry
cleaning
facilities,
it
appeared
that
the
PCE
contamination
could
be
a
result
of
PCE
discharges
to
the
sewer
line
location
in
an
alley
east
of
Main
Street
(Ref.
20,
pp.
5­
6).
Possible
leakage
ofthese
sewer
lines
could
have
conkibuted
to'the
discharge
ofthe
PCE
to
the
subsurface
ground
water
(Ref
4,
p.
3;
Ref.
6,
p.
1;
Ref
20,
p.
6).
There
are
several
dry
cleaning
facilities
(both
former
and
active)
in
the
vicinity
of
the
site
(Ref.
4,
pp.
52­
54;
20,
p.
4).

HRS
Documentation
Record
05/
30/
01
6
McGaffey
and
Main
Groundwater
Plume
NM0000605386
The
NMED
has
conducted
several
soil
and
ground
water
investigations
in
the
area
(Ref
4,
p.
3).
However,
the
precise
extent
of
the
PCE
contamination
in
the
ground
water
has
not
yet
been
determined.
A
brief
s
m
a
r
y
of
the
investigations
conducted
by
the
NMED
is
provided
in
the
following
paragraphs.

In
February
1995,
the
NMED
identified
and
sampled
a
total
of
15
private
domestic
ground
water
wells
and
irrigation
wells
downgradient
of
the
dry
cleaning
facility.
These
particular
wells
were
identified
by
the
NMED
through
a
well
record
search
and
door­
to­
door
surveys
(Ref.
4,
p.
4).
The
presence
of
PCE
was
detected
in
1
1
of
the
15
ground
water
wells.
Concentrations
of
PCE
ranged
from
2.2
ug/
L
to
250
ug/
L
(Ref.
4,
p.
4).
The
FederalMaximumContamhant
Level(
MCL)
for
PCE,
as
established.
bythe
Safe
Drinking
Water
Act
(SDWA),
is
5
ug/
L
(Ref
2).

At
this
time,
the
NMED
discovered
three
residences
whose
sole
source
of
water
(including
drinking)
was
from
their
domestic
wells,
which
are
completed
in
the
shallow
alluvial
aquifer
(Ref
4,
p.
5;
Ref
5,
p.
2).
PCE
had
b,
een
detected
in
two
of
the
three
domestic
wells
at
concentrations
of
79
ug/
L
and
105
ugiL
(Ref
6,
p.
3).
The
NMED
provided
emergency
funding
to
connect
these
residences
to
the
City
of
Roswell
system
which
receives
its
water
from
a
deeper
carbonate­
rock
(artesian)
aquifer
(Ref
7,
p.
1;
Ref
8,
p.
1).

A
limited
shallow
ground
water
investigation
was
conducted
by
the
NMED
m
1995.
A
total
of
13
monitoring
wells
were
installed
during
this
investigation
at
shallow,
intermediate,
and
deep
depths
within
the
alluvial
aquifer
(Ref
4,
p.
9.
Ground
water
samples
were
collected
by
the
NMED
from
these'monitoring
wells
in
1995.
The
PCE
concentrations
rangedfrom44
ugL
to
25,000
ug/
L
mthe
shallowwells.
Thehighest
concentrations
ofPCE
were
lbcated
directly
adjacent
to
the
former
dry
cleaning
facility.
The
PCE
concentrations
ranged
from
1,000
ug/
L
t6
14,000
ug/
L
in
the
intermediate
wells
(Ref
4,
p.
6).

A
limited
soil
vapor
investigationwas
also
conducted
by
the
NMED
in
1995.
The
limited
soil
vapor
investigation
consisted
of
drilling
small
bbre
holes
to
depths
ofapproximately
2
to
3
feet
bgs.
Soil
vapor
concentrations
were
then
measured
using
a
Photo
Ionization
Detector
(PID).
The
results
of
this
investigation
revealed
a
high
concentration
of
PCE
located
immediately
south
of
the
former
Lee
Mack
Cleaners
building
(Ref
4,
p.
7
).

A
nested
soil
vapor
well
wak
later
insialled
in
October
1995
as
a
result
of
the
initial
soil
vapor
investigation.
Soil
vapor
samples
were
collected
and
analyzed
for
PCE.
Concentrations
of
PCE
ranged
from
340
ppm
VN
at
6
feet
bgs
and
increasing
to
1,600
ppm
VN
at
38
feet
bgs.
This
data
suggested
a
substantial
PCE
residual
in
the
vadose
zone
(Ref
4,
p.
6).

Due
to
the
need
to
carefiilly
monitor
changes
m
the
plume
chamcteristics,
two
ground
water
monitoring
events
were
conducted
in
the
vicinity
of
the
glume
during
1998
(Ref
9,
p.
2).
The
first
ground
water
monitoring
event
was
conducted
between
23
and
24
June
1998.
Dunng
this
event,
the
integrity
of
the
monitoring
wells
installed
in
1995
were
checked,
static
water
levels
were
measured
m
these
monitoring
wells,
and
PCE
concentrations
detected
in
the
nearby
City
of
Roswell
municipal
wells
were
verified
with
city
personnel
(Ref
9,
p.
2).

'HRS
Documentation
Record
05/
30/
01
7
McGaffey
and
Main
Groundwater
Plume
NM0000605386
The
second
gmund
water
monitoring
event
was
conducted
between
24
and
25
September
1998.
D
u
n
n
g
.t
h
i
s
event,
ground
water
samples
were
collected
fiom
21
monitoring
wells
(Ref
9,
p.
2).
Analyhcal
results
of
the
1998
ground
water
sampling
indicatedthat'the
average
coricentrationof
PCE
detected
was
4,808
ugL
(Ref.
9,
P.
5).

Between
April
and
September
2000,­
the
NMED
identified
a
total
of25
domestic
groid
water
wells
and
irrigation
wells
downgradient
of
the
dry
'cleaning
hility.
However,
only
16
of
the
25
wells
identifed
were
sampled.
The
presence
of
PCE
was
detected
in
13
.,
ofthe
16
ground
water
wells.
Concentratims
of
PCE
ranged
fiomO.
1
ugL
to
193
ugL.
In
2000,
the
PCE
concentrations
in
the
shallow
wells
ranged
from,
18.4
ugL
to
9,520
ugL.
The
PCE
concentrations
in
the
intermediate
wells
ranged
fiom
5
1
ug/
L
to
6,856
u&
(Ref.
4,
pp.
4,7).

Domestic
wells
and
monitoring
wells
in
which
the
presence
of
PCE
had
been
previously
identified
were
re­
sampled
in
March
2001.
PCE
continued
to
be
detected
at
concentrations
exceeding
the
MCL
in
these
same
domestic
wells
and
monitoring
wells
(Ref.
15,
pp:
1­
48).
'
,

The
City
of
Roswell
has
5
municipal
supply
wells
located
within
2
miles
of
the
ground
water
plume
(Ref
21,
p.
1).
Routine
compliance
samphg
is
conducted
by
the
kew
Mexico
Department
ofHealth
for
all
municipal
supply
wells
to
ensure
compliance
with
drinking
water
stabdards
as
set
forth
in
the
Safe
Drinking
Water
Act
(SDWA)
(Ref.
4,
p.
5;
Ref
5,
p.
2).
PCE
has
been
detected
inte&
teeptly
ii
GO
municipal
supply
weis
beginning
in
1995.
These
concentrations
ofPCE
range
fiom
0.3
u&
'L
to
2.3
ugL,
PCE
has
also
been
detected
consistently
in
two
additionalmunicipalsupply
wells
s
i
r
e
1993.
The
m­
u.
61
pncentration
of
YCE
detected,
ip
these
two
public
supply
wells
is
3.8
ug/
L.
At
present,
the
MCk'for
PCE
h+
not
been
exceeded
(Ref.
4,
pi
5;
Ref.
5,
p.
2).
*I
.,

Based
on
the
analytical
data
accumulated
to
date,
the
concentrations
of
PCE
in
the
ground
water
appear
to
be
increasing
with
depth
(Ref
9,
p.
3).
PCE
is
considered
a
dense
non­
dgueous
phase
liquid
@NAPL)
that
is
heavier
than
water
and,
therefore,
.w
i
l
l
sink
in
yater
(Ref
6,
pp.
'2­
3).
Due
to
the
high
concentptions
ofPCE
that
have
been
detected,
it
is
probable
that
this
DNAPL
is
not
oniy
present
in
the
shallow
ground
water
but
.may
also
be
remobilizing
to
greater
depths
within
the
aquifer
(Ref
4,
p.
7).
Further,
the
confining
unit
present
between
the
alluvial
and
artesian
aqu$
ers,
the
Queen
aquitard,
,is
a
leaky,
confining
unit
thereby
providing
the
flow
path
for
the
PCE
to
reach
the
lower
aquifers
(Ref.
4,
p.
4;
Ref.
6,
p.
2;
Ref:
18,
p.
8).
I
1
.

HRS
Documentation
Record
05/
30/
01
8
McGaffey
and
Main
Groundwater
Plume
.
NM0000605386
1.

2a.

2b.

2c.

3.

4.

5.

6.
WORKSHEET
FOR
COMPUTING
H
R
S
SITE
SCORE
­
S
­
s2
100
10,000
Ground
Water
Migration
Pathway
Score
(S,)
(fi­
om
Table
3­
1,
line
1
3)

Surface
Water
OverlandRlood
Migration
Component
(fi­
om
Table
4­
1,
line
30)

Ground
Water
to
Surface
Water
Migration
Component
(from
Table
4­
25,
line
28)

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

Soil
Exposure
Pathway
Score
(S,)
(fi­
om
Table
5­
1
,
line
22)

Air
Migration
Pathway
Score
(S3
(fi­
om
Table
6­
1,
line
12)

Total
of
Sw2
+
SSw2
+
S:
+
S,
'

HRS
Site
Score:
Divide
the
value
on
line
5
by
4
and
take
the
square
root.

Notes:

S
Score
S2
Scoresquared
NS
NotScored
NS
NS
NS
NS
NS
NS
NS
NS
N
S
N
S
­""­

50
Tables
3­
1,
4­
1,
4­
25,
5­
1,
and
6­
1
refer
to
scoresheets
presented
in
the
HRS
Rule
(Ref
1).
Table
4­
1
is
reproduced
on
the
following
pages
of
this
documentation
record
for
the
convenience
of
the
reader.

HRS
Documentation
Record
05/
30/
0l
9
McGaffey
and
Main
Groundwater
Plume
NM0000605386
SITE
NAME:
MCGAFFEYAND
MAIN
GROUNDWATER
PLUME
SITESCORE:
50
TABLE
3­
ld
GROUND
WATER
MIGRATION
PATHWAY
SCORESHEET
Factor
Cateyories
and
Factors
Likelihood
of
Release
to
an
Aquifer:

1.
ObservedRelease
2.
PotentialtoRelease:
2a.
Containment
2b.
NetPrecipitation
2c.
DepthtoAquifer
2d.
TravelTime
2e.
Potential
.to
Release
b
e
s
2a(
2b
+
2c
+
id)]
3.
Likelihood
of
Release
(hgher
of
lines
1
and2e)

Waste
Characteristics:

4.
ToxicityMobility
5.
HazardousWasteQuantity
6.
WasteCharacteristics
Targets:

7.
NearestWell
8.
Population
Sa.
Level
I
Concentrations
8b.
Level
II
Concentrations
8c.
PotentialContamination
8d.
Population(
lines8a
+
8b
+
8c)
9.
1
0.
WellheadProtectionArea
11.
Targets(
lines7
+
8d+
9
+
10)

HRS
Documentation
Record
05/
30/
01
10
MakimumValue
Value
AssiFned
550
550
10
10
5
35
500
550
NS
NS
NS
NS
NS
550
100
100
10
50
50
53.2
9,600.0
NS
9,653.2
5
20
9678.2
McGafEey
and
Main
&oundwater
Plume
NM0000605386
SITE
NAME:
MCGAFFEY
AND
MAIN
GROUNDWATERPLUMESITESCORE:
50
.
TABLE
3­
ld
GROUND
WATER
MIGRATION
PATHWAY
SCORESHEET
Ground
Water
Migration
Score
for
an
Aquifer:

12.
AquiferScore[(
lines3
x
6
x
11)/
82,500]
([
lines
14
x
17
x
20]/
82,500)

Ground
Water
Migration
Pathway
Score:

13.
PathwayScore
100
100
100
100
(a)
Maximum
valueappliestowastecharacteristicscategory.
(b)
Maximum
valuenotapplicable.
(c)
Do
notroundtothenearestinteger.
(d)
Table
3­
1.
refers
to
scoresheets
presented
in
the
Federal
Register
(Reference
1).
NS
NotScored.

HRS
Documentation
Record
05/
30/
01
i.

11
McGaiTey
and
Main
Groundwater
Plume
NM0000605386
I
Source
1:
Ground
Water
Plume
SD
­
Characterization
and
Containment
SOURCE
DESCRIPTION
2.2
SOURCE
CHARACTERIZATION
Information
pertaining
to
Source
1,
Ground
Water
Plume,
is
provided
in
the
following
paragraphs.

2.2.1
Source
Identification
Number
of
the
source:
1
Name
and
descriution
of
the
source:
Ground
Water
Plume
with
an
unidentified
source.

This
source
consists
of
a
plume
of
containinated
ground
water
and
will
be
classified
and
evaluated
as
the
HRS
source
type
"Other
(Ground
Water
Plume)"
(Ref
10,
p.
3).
Although
the
contamination
might
be
partially
attributed
to
operations
at
the
former
Lee
Mack
Cleaners,
the
exact
source
of
the
contamination
has
not
been
identified.
Therefore,
Source
1
will
be
defined
as
a
ground
water
plume
with
an
unidentified
source.

The
boundary
of
the
ground
water
plume
is
defined
by
ground
water
samples
.collected
from
private
domestic
wells,
monitoring
wells,
and
municipal
supply
wells
meeting
observed
release
criteria.
Private
domestic
wells
used
to
define
the
estimated
extent
of
tk
ground
water
plume
include
the
following
seven
wells:
1706
S.
Atkinsoq
1806
S.
Atkinson,
2304
S.
Atkinson,
1105
E.
Poe,
,1801
S.
Cahoon,
2305
S.
Cahoon,
and
210
E.
Reed.
The
monitoring
wells
used
to
define
the
estimated
extent
of
the
ground
water
p
h
e
include
those
installed
by
the
NMED
consistingofED95­
1
through
ED95­
13
as
well
as
five
additionalmonitoring
wells:
TH­
4A,
TH­
74
TH­
8A,
TH­
9,
and
TH­
18.
Municipal
supply
wells
used
to
define
the
estimated
extent
of
the
ground
water
plume
include
four
City
of
Roswell
municipal
supply
wells:
SRWl2,
SRWl3,
SRW
15,
and
SRWl6.

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

The
7
private
domestic
wells,
1
6
,
monitoring
wells,
and
4
municipalsupply
wells
meeting
observed
release
criteria
are
largely
located
mthe
southwesternportionofthe
City
ofRoswell,
approximately
2
miles
west
ofwhere
South
Main
Street
and
U.
S.
Highway
285
converge
(Ref.
3,
pp.
1­
2).
The
approximate
boundary
of
the
plume
is
bounded
by
McGaffey
Street
to
the
north,
AtkinsonAvenue
to
the
east,
Poe
Street
to
the
south,
and
Main
Skeet
to
the
west
as
shown
on
Figure
A­
3
of
Attachment
A
(Ref
3,
pp.
1­
2).
Source
M
e
for
HRS
evaluation
purposes:

This
source
consists
of
a
plume
of
contaminated
ground
water
with
an
unidentified
source
and
will
be
classified
and
evaluated
as
the
HRS
source
type
"Other
(Ground
Water
Plume)."
.
."

HRS
Documentation
Record
05i30i01
12
McGaffey
and
Main
Groundwater
Plume
NM0000605386
Source
1:
GroundWater
Plume
SD
­
Characterization
and
Containment
Containment:

Gas
release
to
air:
The
air
migration
pathway
was
not
scored;
therefore,
gas
containment
was
not
evaluated.

Particulate
release
to
air:
The
air
migration
pathway
was
not
scored;
therefore,
particulate
containment
was
not
evaluated.

Release
to
ground
water:
There
are
no
containment
features
associated
with
this
source
as
it
is
a
gound
water
plume.
Further,
evidence
of
migration
of
contaminants
associated
with
the
plume
to
the
ground
watei­
pathway
has
been
aocumented
in
7
private
domestic
wells,
1
6
monitoring
wells,
and
4
municipal
supply
wells
(See
Section
3.1
.
1
,
Observed
Release).
Considering
that
analytical
results
ob'tained
&om
ground
'water
samples
collected
between.
the
years
of
1995
and
200
1
revealed
the
presence
ofPCE
and
that
no
containment
features
are­
present
to
limit
the
migration
of
hazardous
substances
associated
with
the
source,
a
containment
factor
value
of
10
will
be
assigned
to
the
somce
(Ref.
1,
Table
3­
2).

Release
by
overland
flow
migration
andor
flood:
The
surface
water
migration
pathway
was
not
scored;
therefore,
surface
water
containment
was
not
evaluated.

­Release
to
soil:
There
is
no
surface
soil
available
to
sample
at
the
site.
Additionally,
subsurface
soil
samples
have
not
been
collected
to
date.
The
entire
site
1s
covered
with
concrete
thereby
limiting
the
probability
far
persons
to
be
impacted
via
soil
exposure.
As
such,
the
soil
exposure
pathway
d
n
o
t
be
further
evaluated
hthis
document.

HRS
Documentation
Record
05/
30/
01
13'
McGaffey
and
Main
Groundwater
Plume
NM0000605386
Source
1:
Ground
Water
Plume
SD
­
Hazardous
Substances
Associated
with
a
Source
2.2.2
HazardousSubstancesAssociatedwithaSource
Because
this
source
is
being
evaluated
and
scored
as
a
ground
water
plume
with
an
unidentified
source,
all
CERCLA­
eligible
substances
meeting
observed
release
criteria
have
been,
considered.

An
observed
release
to
an
aquifer
is
established
by
demonstrating
that
the
site
has
released
a
hazardous
substance
to
the
@er
based
either
on
direct
observation
or
chemicalanalysis
(Ref
1
,
Sec.
3.1.1).
An
observed
release
based
on
chemical
analysis
is
established
as
follows:,

If
the
background
concentration
is
not
detected
(or
is
less
than
the
detectionlimit),
an
observed
release
is
established
when
the
sample
measurement
equals
or
exceeds
the
sample
quantitation
limit
(SQL).
If
the
SQL
cannot
be
established,
the1
EPX
coitract­
required
quantitationlimit
(CRQL)
is
used
in
place
of
the
SQL
for
samples
analyzed
under
the.
EPA'Contract
Laboratory
Program
(CLP).
If
sample
analysis
is
not
performed
under
the
EPA
CLP,
the
'laboratory
detection
limit
(DL)
is
used
in
place
of
the
SQL
(Ref
1,
Sec.
2.3,
Table
2­
3).

Ifthe
background
concentration
equals
or
exceeds
the
,detectionlimit,
an
observed
release
is
established
when
the
sample
measurement
is
three
(3)
times
or
more
above
the
background
concentration
(Ref
1,
Sec.
2.3,
Table
2­
3).
t
,

Grohd
water
samples
were
collected
by
the
NMED
Ground
Water
Quality
Bureaubetweenthe
period
of
1995
and
2001.
During
this
six­
year
period,
PCE
was
continually
detected
in
ground
water
samples
collected
fiom
monitoring
wells
and
private
domestic
wells.
The
ground3water
samples
were
analyzed
by
the
State
of
New
Mexico's
Department
of
Health
laboratory
(ie.,
the
Scient&
Laboratory
Division)
for
VOCs
only.
Laboratory
analyhcalresults
fiomthe
various
NMED
sampling
events
have
been
hcluded
as
References
11,
12,
13,14,15,
and
16.

Additionally,
routine.
compliance
sampling
is
conducted
by
the
New
Mexico
Department
of
Health
for
all
municipalsupply
wells
to
ensure
compliance
with
dnnhng
water
standards
as
set
forth
by
the
SDWA
(Ref.
4,
p.
5;
Ref.
5,
p.
2).
Ground
water
samples
collected
i?
om
the
municipalsupply
wells
are
also
analyzedbythe
State
ofNew
Mexico's
Department
ofHealth
laboratory.
Laboratory
analytical
results
hmthe
municipal
supply
wells
havebeenincluded
as
Reference17.
'

As
such,
the
analyticalredts
presented
m
the
following
fables
provide
evidence
ofPCE
contamhationassociated
with
Source
1,
Ground
Water
Plume,
PCE
has
been
detected
on
more
than
one
occasion
in
the
same
well,
but
only
the
maximum
concentration
of
PCE
detected
in
the
particular
well
has
been
presented
as
evidence
of
hazardous
substances
associated
with
Source
1
,
Ground
Water
Plume.

HRS
Documentation
Record
05/
30/
01
14
McGaffey
and
Main
Groundwger
Plume
NM0000605386
Source
1:
Ground'Water
Plume
SD
­
Hazardous
Substances
Associated
with
a
Source
The
New
Mexico
Department
of
Health
laboratory
utilized
one
of
the
following
detection
limits
for
comparison
purposes:
the
Method
Detection
Limit
@DL),
the
Practical
Quantitation
Limit
(PQL),
and/
or
the
Sample
Detectionhit
(SDL).
A
sample
measurement
exceeding
one
of
these
detection
limits
provides
evidence
of
the
presence
of
a
particular
substance.
The
specific
type
of
detection
limit
utilized
by
the
laboratory
is
denoted
m
the
following
table
of
analytical
results.

HAZARDOUS
SUBSTANCES
ASSOCIATED
WITH
SOURCE
1
MONITORING
WELLS
ug/
Lmicrogramsperliter.
PQLPractical
Quantitation
Limit;
used
for
comparison
purposes
since
the
sample
was
not
analyzed
through
the
EPA
CLP
(Ref.
11,
pp.
60­

SDL
Sample
Detection
Limit;
used
for
comparison
purposes
since
the
sample
was
not
analyzed
through
the
EPA
CLP
(Ref.
12,
pp.
13­
26;
101).

Ref.
13,
pp.
7­
9;
Ref.
14,
pp.
16­
18).

HRS
Documentation
Record
05/
30/
01
15
McGaiTey
and
Main
Groundwater
Plme
NM0000605386
Source
1:
Ground
Water
Plume
SD
­
Hazardous
Substances
Associated
with
a
Source
HAZARDOUS
SUBSTANCES
ASSOCIATED
WITH
SOURCE
1
(continued)

PRIVATE
DOMESTIC
WELLS
..

HRS
Documentation
Record
05L30/
018
16
McGaffey
and
Main
Groundwater
Plume
NM0000605386
Source
1:
Ground
Water
Plume
SD
­
Likelihood
of
ReleaseNaste
Characteristics
2.2.3
IdentifvHazardousSubstancesAvailable
to
aPathwav
B,
ecause
containment
for
Source
1
is
greater
than
0,
the
following
hazardous
substances
are
available
to
the
pathway
being
evaluated
(ground
water
pathway):
PCE.

2.3
LIKELIHOOD
OF
RELEASE
Refer
to
Section
3.1
ofthis
documentationrecord
for
specific
infomationrelating
to
samples
that
meet
the
criteria
for
an
observed
release
to
the
ground
water
migration
pathway.

2.4
WASTE
CHARACTERISTICS
Specific
factors
related
to
waste
characteristics
associated
with
Source
1
are
presented
in
the
subsections
below.

2.4­
1
.
Selection
of
SubstzincePotentiallyPosinptheGreatestHazard
­.

"Based'on
the
analytical
results
of
ground­
water
samples
collected
as
part
of
the
investigations
conducted
for
the
McGaffey
and
Main
Groundwater
Plume
site,
PCE
was
the
only
substance
commonly
detected
in
the
ground
water
samples
analyzed
(Refs.
1
1
;
12;
13;
14;
15;
16;
17).
As
such,
PCE
is
the
substance
selected
as
potentially
posing
the
greatest
hazard
for
the
pathway
(threat]
and
will
be
used
in
evaluating
the
waste
chai­
acteristks
category
of
the
pathway
(threat)
(Ref.
1,
Sec.
2.4.1).
For
further
information
regarding
PCE's
association
with
Source
1,
refer
to
Section
3.2.
of
this
documentation
record.

2.4.2
Hazardous
'Waste
Ouantity
2.4.2.1.
SourceHazardousWasteQuantity
2.4.2.1.1
HazardousConstituentQuantity(
Tier
A)
­
NotCalculated
Thehazardousconstituentquantity
is
not
available;
therefore,
it
is
not
possible
to
adequately
determine
a
hazardous
constituent
quantity
(Tier
A)
for
Source
1
(Ref
1,
Sec.
2.4.2.1.1).
As
a
result,
the
evaluation
of
hazardous
waste
quantity
proceeds
to
the
evaluation
of
Tier
B,
hazardous
wastestream
quantity
2.4.2.1.2HazardousWastestreamQuantity(
Tier
B)
­
NotCalculated
The
hazardous
wastestream
quantity
is
not
available;
therefore,
it
is
not
possible
to
adequately
detennine
a
hazardous
wastestream
quant&
(Tier
B)
for
Source
1
(Ref
1,
Sec.
2.4.2.1.2).
As
a
result,
the
evaluation
of
hazardous
waste
quantity
proceeds
to
the
evaluation
of
Tier
C,
volume
(Ref
1,
Sec.
2.4.2.1.3).

HRS
Documentation
Record
05/
30/
01
17
McGaffey
and
Main
Groundwater
Plume
NM0000605386
Source
1:
Ground
WaterPlume
SD
­
Likelihood
of
ReleaseWaste
Characteristics
2.4.2.1.3
Volume(
Tier
C)

The
vertical
and
horizontal
extent
ofthe
ground
water
plume
has
not
yet
been
adequately
determined.
Therefore,
it
is
not
possible
to
determine
a
volume
in
cubic
yards
for
Source
1.
Thus,
the
volume
of
contamination
will
be
assigned
a
volume
hazardous
waste
quantity
value
of
greater
than
(>)
0
(Ref.
1,
Sec.
2.4.2.1.3).

Volume.
of
Source
(yds3):
>
O
Volume
Assigned
Value:
Unknown,
but
>
0
2.4.2.1.4
Area(
Tier
D)

Area
(Tier
D)
was
not
evaluated
since
a
volume
for
the
source
has
already
been
assigned
2.4.2.1.5SourceHazardousWasteQuantity
Value
According
to
the
HRS
Rule,
the
highest
of
the
values
assigned
to
eachsource
for
hazardous
constituent
quantity
(Tier
A),
hazardous
wastestream
quantity
(Tier
B),
v
o
h
e
(Tier
C),
and
area
(Tier
D)
should
be
assigned
as
the
source
hazardous
waste
quantity
value.
As
such,
volume
(Tier
C)
was
the
only
tier
evaluated
for
Source
1.
Therefore,
the
v
o
h
e
determined
for
Source
1
yill
be
assigned
as
the
source
hazardous
waste
quantity
for
Source
1
(Ref.
1,
Sec.
2.4.2.1.5).

A
Not
Calculated
B
Not
Calculated
C
Unknown,
but
>
0
~

D
I
Not
Calculated
I
I
­
I
1
Source
Hazardous
Waste
Quantity
Value:
Unknown,
but
>
0
2.4.2.2
HazardousWasteQuantityFactorValue
According
to
the
HRS
Rule,
if
the
hazardous
constitueqt
quantity
has
not
beenadequately
determined
for
one
or
more
sources
and
if
any
target
for
the
migration
pathway
being
evaluated
is
subject
to
Level
I
andor
Level
I1
concentrations,
a
value
fiom
HRS
Table
2­
6
or
a
value
of
100,
whichever
value
is
greater,
is
assigned
as
the
hazardous
waste
quantity
factor
value
for
that
pathway.
Because
both
Level
I
and
Levd
11
targets
have
been
i
d
d
e
d
for
the
ground
water
mi­
on
pathway
(the
only
pathway
being
evaluated)
even
though
the
hazardous
constituent
quantity
has
not
been
adequately
determined,
a
value
of
100
is
assigned
as
the
hazardous
waste
quantity
factor
value
€or
the
ground
water
migration
pathway
(Ref.
1
,
Sec.
2.4.2.2,
Table
2­
6).

Hazardous
Waste
Quantity
Factor
Value:
100
HRS
Documentation
Record
05/
30/
01
18
McGaffey
and
Main
Groundwater
Plume
NM0000605386
3.0
GW
­
General
Considerations
GROUND
WATER
MIGRATION
PATHWAY
3.0.1
GeneralConsiderations
The
City
of
Roswell
is
located
within
the
Pecos
River
Valley
in
southeastern
New
Mexico
(Ref.
6,
p.
2).
The
Roswell
area
has
a
semi­
arid
climate
which
averages
approximately
12
inches
of
precipitation
per
year,
most
of
which
occurs
during
summer
thunderstorms
(Ref.
18,
p.
2).
The
mean
mual
air
temperature
in
Roswell
is
approximately
59
degrees
Fahrenheit
with
mild
winters
and
hot
summers
(Ref
18,
pp.
2,5).

The
City
of
Roswell
is
located
in
the
northern
portion
of
the
Roswell
Ground
Water
Basin.
Large
volumes
of
ground
water
are
withdrawn
fiom
a
shallow
alluvial
aquifer
and
underlying
carbonate­
rock
(artesian)
aquifer
m
the
Roswell
Basin.
These
two
aquifers
form
the
Koswell
Basin
Aquifer
system
(Ref
19,
p.
10).
The
aquifer
system
undkrlies
part
of
the
Pecos
River
and
extends
though
an
area
of
about
2,200
square
miles
fiom.
north
of
Roswell
to
northwest
of
Carlsbad,
New
Mexico
(Ref.
19,
p.
10).

Ground
water
in
.@
e
Permian­
aged
carbonate
rocks
is
present
in
openings
formed
by
dissolution
of
part
of
the
limestone,
dolomite,
and
gypsuq­~
that
are
prevalent
m
the
rock.
The
most
permeable
and
extensively
utilized
aqder
in
the
carbonate
rocks
is
in
the
Roswell
Basin.
This
carbonate­
rock
aquifer
and
the
hydraulically
connected
aquifer
mthe
alhmiumhave
been
studied
extensively
because
ofthe
importance
ofthis
source
ofground
water
(Ref
19,
p.
IO).

Ground
water
that
flows
through
joints,
fractures,
or
faults
m
soluble
rocks
composed
of
carbonate
(limestone
or
dolomite)
or
evaporite
(gypsum
or
halite)
minerals
can
dissolve
the
surrounding
rock
and
enlarge
the
openings.
Over
geologic
time,
a
vast
network
of
interconnected
openings
can
develop
in
the
rock,
and
large
volumes
of
ground
water
can
flow
through
the
openings
(Ref
19,
p.
10).
When
solution­
altered
rock
becomes
sufficiently
porous,
it
may
lack
the
strength
to
support
the
weight
of
overlying
materials,
and
a
broad
gradual
collapse
of
the
rock
can
occur.
The
collapse
reduces
the
thickness
of
the
formation
and
creates
additional
h
t
u
r
e
s
that
are
subject
to
M
e
r
dissolution.
A
local,
and
sometimes
rapid,
collapse
of
the
rock
can
produce
sinkholes
and
create
a
crater­
like
appearance
known
as
karst
topography
of
the
land
surface
(Ref.
19,
p.
lo)..

Where
carbonate
rocks
are
exposed
at
land
surface,
solution
features
create
the
karst
topography.
Because
water,
enters
the
carbonate
rocks
rapidly
through
sinkholes
and
other
large
openings,
any
contaminants
present
in
the'
water
can­
rapidly
enter
an6
spread
through
the
aquifer(
s)
(Ref
19,
p.
6).
According
to
available
U.
S,
Geological
Survey(
USGS)
documents
reviewed,.
the
Roswell
Basin
Aqwfer
systemis
considered
a
karst
aquSer
(Ref
19,
p.
10).

Ground
water
in
the
carbonate­
rock
aquifer
in
the
Roswell
Basin
primarily
is
present
m
solution­
altered
zones
m
the
San
Andres
Limestone
and
the
overlying
Queen
and
Grayburg
Formations
(Ref
19,
p.
11).

HRS
Documentation
Record
05/
30/
01
19
McGaffey
and
Main
Groundwater
Plume
NM0000605386
GW
­
General
Considerations
The
San
Andres
Limestone
is
found
at
depths
ranging
from
300
to
1300
feet
bgs.
Limestone
and
dolomite
are
the
principle
rocks
in
the
San
Andres
Limestone,
although
a
100
to
200­
feet
thick
sandstone
(the
Glorieta
Sandstone)
is
located
near
the
base
ofthe
formation.
The
San
Andres
Limestone
is
1200
to
1500­
feet
thick
along
the
easternmargin
ofthe
Roswell
Basin,
but
thins
to
700
to
1,000
feet
mthe
northwesternpart
ofthe
basin
where
dissolution
and
collapse
have
decreased
the
thickness
of
the
formation
(Ref.
19,
p.
11).

The
Grayburg
And
QueeriFormations
overlie
the
SanAndres
Limestone.
The
Grayburg
Formation
predominantly
consists
of
dolomite
and
gypsum
with
interbedded
sandstone
and
shle.
'The
Queen
Formation
consists
,of
fine­
grained
sandstone
and
siltstone
with
interbedded
gypqm.
The
two
formations
are
between
400
and
800­
feet
thick
along
the
eastemmargin
of
the
basin
and
thin
westward
as
the
result
of
erosion
and,
dissolution
(Ref.
19,
p.
.,

11).
,,

,I
,,

The
Seven
Rivers,
Yates;
and
Tamil
Formations
overlje
the
Queen
Formation
and
crop
out
at
higher
altitude
than
the
alluvium
m
the
northern
part
ofthe
Roswell
Bask.
These
three
formations
consists
of
dolomite,
limestone,
and
gypsum
with
interbedded
sandstone
and
siltstone
(R$.
19,
p.
1
1).

Quaternary
aUuvium
that
consists
of
unconsdlidated
myel,
sand,
sil4
and
clay
unconf&
nably
overlies
the
Permian­
aged
rocks
m
the
Roswell
Basin.
Aliuvik~
&d
associated
terrace
deposits
ifom
a
10
to
20­
mile­
wide
ban&,
primady
to
the'
west
of
the
Pecos
Rivkr."
&e
alluvium
generally
is
about
150
to
300­
feet
thick
near
the
Pecos
River
and
thins
to
the
west
(Ref.
19,
pp.
1
1­
12).
,,
,.
­,

,,

The
alhrvnrm,
present
at
the
sMace,
contains
water
under
unconfined
(water
table)
conditions.
The
alluvial
@er
is
hydraulically
connected
to
the
underlying
carbonate­
rock
aquifer
by
leakage
through
the
upper
confining
unit
of
the
carbonate­
rock)
aquifer.
The
water
table
in
the"
alluvial
aquifer
is
at
or
near
land
surf=
along.
most
of
the
Pecos
River
(Ref.
19,
p.
12).

Solution­
altered
zones
in
the
San
Andres
Limestone
and
the
Grayburg
Formation
form
the
principal
carbonate­
rock
acpfer
in
the
Roswell
Basin.
The
carbonate­
rock
aquifer
is
200
to
500­
feet
thick
in
the
eastern
one­
half
of
the
Roswell
Basin
and
thins
northward
and
westwarg,(
Ref.
19,
p.
12).
­
The
lower
boundary
of
the
aquifer
is
formed
by
the
unaltered
lower
part
of
the
San
'hdres
Limestone
or
Glorieta
Sandstone,
or
the
underlying
Yeso
Formation.
The
upper
part
of
the
Grayburg
and
Quekn
Formations
generally
are
little
,altered
and
have
low
permeability.
The
zones
of
low
permeability
ih
these
two
formations
form
the
upper
confining
unit
of
the
carbonate­
rock
aquifer
and
separate
it
fkom
the
.overlying
alluvial
aquifer
(Ref.
19,
p.
12).
This
confining
unit
is
estimated
to
be
between
50
feet
and
100
feet
thick
ih'
the
Roswell
'area
(Ref
4,
p'.
4).
.
I,
,

Interaqder
leakage
occurs
between
the
carbonate­
rock
aquifer
and
the
overlying
alluvial
aquifer
though
the
Queen
quitard
(Ref
18,
pp.
8).
Leakage
is
generally
gfeatest
m
the
vicinrty
of
Roswell
and
decreases
to
the
south
and
southwest.
Prior
to
the
development
of
irrigation;
wells,
water
leaked
vertically
upwards:,
fiom
the
carbonate­
rock
aqui6er
to
the
alluvial
a@&­.
At
present,
the'large
'drawdown
of
the
potentiometric
surface
in
the
carbonate­
rock
a
w
e
r
during
the
summer
irrigation
season
reverses
the
direction
of
vertical
lqakage
(i.
e.,
leakage
is
downward
from
the
alluvial
aquifer
into
the
carbonate­
rock
aquifer)
(Ref
18,
pp.
8­
9).

HRS
Documentation
Record
McGaf€
ey
and
Main
Groundwater
Plume
05/
30/
01
20
NM0000605386
GW
­
General
Considerations
Historically,
regonal
ground
water
flow
in
the
Roswell
area
has
been
to
the
southeast
toward
the
Pecos
River
with
the
mountains
and
fmthdls
to
the
west
of
the
Pecos
River
being
the
recharge
zones.
However,
both
vertical
and
horizontal
flow
directions
have
been
altered
locally
by
ground
water
withdrawal
(Ref
4,
p.
4).
Locally,
the
direction
of
grouid
water
flow
is
to
the
southeast
(Ref.
20,
p.
5).

The
City
of
Roswell
is
a
large
agriculture
area
(Ref.
6,
p.
2).
In
1978,
approximately
95
percent
of
the
ground
water
withdrawn
from
the
Roswell
Basin
was
used
for
irrigation..
In
1985,
approximately
88
percent
of
the
ground
water
withdrawn
fiomthe
basin
was
used
for
&gationand
approximately
8
percent
was
used
for
public
supply.
Large­
capacity
wells
completed
m
the
carbonate­
rock
aqder
generally
yield
in
excess
of
3,000
gallons
per
minute
(gpmj.
Smaller
capacity
wells
commonly
yield
500
to
1,000
gpm
(Ref.
19,
p.
16).

The
City
of
Roswell's
piimary
drinking
water
supply
resides
in
the
carbonate­
rock
(artesianj
aquifer.
The
City
of
Roswell's
public
water
supply
system,
known
as
the
Berrendo
Public
Water
System,
and
most
of
the
water
utilized
for
irrigation
purposes
in
the
Pecos
Valley
is
fiom
the
carbonate­
rock
aquifer
(Ref
4,
PA).

8
.

Several
private
domestic
wells
are
located
within
1.5
miles
downgradient
of
the
identified
ground
water
plume.
Additionally)
5
municipal
supply
wells
are
located
within
4
miles
of
the
identiiied
ground
water
plume
(Ref.
21,
p.
1).
­
All
of
the
municipal
supply
wells
for
the
City
of
Roswell
are
completed
within
the
carbonate­
rock
(artesian)
aquifep
(Ref.
6,
p.
2;
Ref.
21,
p.
1).

In
the
vicinity
of
the
site,
the
alluvial
deposits
are
composed
of
clay,
silt,
sand,
and
gravel
with
some
caliche
intermixed.
The
thickness
ofthese
alluvial
deposits
is
approximately
150
to
200
feet.
Depth
to
waterranges
from
approximately
,10
to
50
feet
bgs
(Ref
6,
p.
2).
The
confining
unit
underlying
the
alluvial
deposits
is
composed
of
interbedded
kandstone,
siltstone),
claystone,
and
carbonate
material.
The
thiclcness
of
the
confining
unit
in
the
vicinity
ofthe
site
has
been
measured
between
30
to
50
feet
(Ref
6,
p.
2).
As
previously
stated,
the
confining
unit
is
not
completely
impermeable
and
leakage
is
known
to
occur.
Deposits
of
the
San
Andres
Limestone
underlie
the
confining
unit
beneath
the
site
and
consist
largely
of
limestone
and
dolomite
(Ref.
19,
p.
1
1).

HRS
Documentation
Record
05/
30/
01
21
McGaffey
and
Main
Groundwater
Plume
NM0000605386
GW
­
Likelihood
of
Release
3.1
LIKELIHOOD
OF
RELEASE
3.1.1
Observed
Release
The
ground
water
migrationpathway
is
the
only
pathway
being
scored
for
the
McGaffey
and
Main
Groundwater
Plume
site
due
to
the
nature
of
the
contamination
(i.
e.
7
ground
water
plume)
(Ref
1,
S
e
c
.
2.2.3).
Identification
and
characterization
of
the
ground
water
plume
was
based
on
analytical
results
from
,ground
water
samples
collected
over
a
six­
year
period
between
1995
and
2001.

An
observed
release
to
the
Gromd
Water
Pathway,
as
defined
in
Section
3.1.1
of
the
HRS
Rule,
has
been
established
based
on
the
analytical
results
fkom
the
aforementioned
ground
water
samples
(Ref
1,
Sec.
2.3).
Informationused
to
evalyate
and
score
the
groyrid
waterqiptionpathwayispresented
mthe
subsections
below.

The
City
of
Roswell
is
located
in
the
northern
portion
of
the
RosweU.
Ground
Water
Basin.
Large
volumes
of
ground
water
are
withdrawn
from
a
shallow
du&&
upif$
r
and
underlying
carbonate­
rock
(artesian)
aquifer
in
the
Roswell
Basin.
The
carbonate­
rock
aquifer
'and
the'hydraulidly
connected
aqda
in
the
alluvium
form
the
Roswell
Basin
A
q
d
a
system
which
is
the
aquifa
s
y
s
t
~
b&
g
evaluated
for
this
site.
q
e
f
19,
p.
10).
Further,
the
@as
of
the
Roswell
Ground
Water
Bas@
.
,I
have
'been
classified
as
karst
aquifers
by
the
USGS
(Ref.
19,
p.
10).
.
,
'
.I
,,

,~

Because
of
the
dissolution
cavities
and
the
channels
that
comprise
them,
karst
aquifers
are
considered
extremely
vulnerable
to
contamination.
The
movemqt
ofhazardoussubstancesreleasedinto
karst
aquifersishighly
unpredictable,
and
transport
over
relatively
long
distances
can
occur
very
rapidly
(Ref.
10,
p.
4).
The
City
of
Rosweuls
primarydrinking
water
supply
resides
m
the
carbonate­
rock
(artesian)
aquifa
and
the
municipal
supply
wells
are
completed
within
the
carbonate­
rock
(artesian>
.aquifer
(Ref.
,2
1
p.
1).

Interaquifer
leakage
occurs
between
the
alluvi,
d
aquifer
and
the
carbonate­
rock
(artesian)
aquifer
through
the
Queen
aquitard
(Ref
18,
pp.
8).
Leakageisgenerallygreatest
in
thevicinityofRoswell.
Priortothe
development
of
irrigation
wells,
water
leaked
vertically
upward
fkom
the
carbonate
aquifer
to
the
alluvial
aquifer.
At
present,
the
large
drawdown
of
the
potentiometric
surface
in
the
carbonate­
rock
aquifer
during
the
summer
irrigation
season
reverses
the
directionofverticalleakage
(i.
e.,
leakage
is
downward
hmthe
alhwialaquifer
into
the
carbonate­
rock
aquifer)
(Ref.
18,
pp.
8­
9).

Direct
Observation:
Not
Applicable
Chemical
Analysis:
Evidence
documenting
an
observed
release
by
chemicalanalysis
is
presented
in
the
following
paragraphs.
The
presence
of
PCE
has
been
detected
m
both
the
shallow
alluvial
aquifer
and
the
underlying
carbonate­
rock
(artesian)
aquifer
(See
Section
3.1.1.
Observed
Release,
Release
Wells).

HRS
Documentation
Record
05/
30/
01
22
McGaffey
and
Main
Groundwater
Plume
NM0000605386
BACKGROUND
WELLS
Ground
water
samples
used
to
establishbackground
levels
for
PCE
for
the
domestic
wells
and
monitoring
wells
were
based
on
analytical
results
li­
om
sampling
events
conducted
between
the
years
of
1995
and
2001
by
the
NMED
(Ref
16,
pp.
1­
24).
Ground
water
samples
used
to
establish
background
levels
for
PCE
for
the
municipal
supply
wells
were
based
on
analytical
results
li­
om
samples
collected
between
the
years
of
1992
and
1999.
Ground
water
samples
collected
li­
om
municipal
supply
well
SRW17,
which
has
been
designated
to
represent
backpund
conditions
of
the
municipal
supply
system,
were
collected
as
part
of
routine
compliance
sampling
mandated
by
the
Safe
Drinking
Water
Act
(Ref
17,
pp.
3
1­
37).
It
should
be
noted
that
a
separate
background
investigation
was
not
conducted
for
the
site.
Ground
water
wells
that
have
been
designated
as
background
wells
have
been
depicted
on
Figure
A­
3
of
Attachment
A.

Regionally,
ground
water
flow
in
the
Roswell
area
has
historically
been
to
the
southeast
toward
the
Pecos
River.
Locally,
'ground
water
flow
within
the
vicinity
of
the
site
is
to
the
southeast
(Ref.
4,
p.
4;
Ref.
20,
p.
5).
Thus,
ground
water
wells
representative
of
background
conditions
for
the
area
were
chosen
based
on
their
location
beirig
upgradient
or
cross­
gradient
of
the
approximate
location
ofthe
identified
ground
water
plume
(Ref.
3,
pp.
1­
3;
Ref.
21,
p.
6;
Figure
A­
3).

All
of
the
ground
water
samples
were
collected
and
analyzed
in
a
similar
manner
(i.
e.,
collected
using
the
same
sampling
techniques
and
analyzed
under
the
same
analyticalmethods).
Further,
all
of
the
domestic
and
monitoring
well
ground
water
samples
were
collected
by
the
same
agency
(NMED)
and
analyzed
by
the
same
laboratory
(Refs.
4,9,
1
1,
12,
13,
14,
15,
and
16).
Likewise,
all
of
the
samples
collected
from
the
municipal
supply
wells
were
analyzed
by
the
same
laboratory
(Ref
17,
pp.
1­
37).

PCE
is
a
manufactured
chlorinated
solvent
and
does
not
occur
naturally
within
the
environment
(Ref
22,
p.
1)
Therefore,
the
background
level
of
0
for
PCE
can
be
considered
representative
of
background
conditions
ofthe
area.
As
such,
an
observed
release
to
the
ground
water
d
b
e
established
when
the
sarnple
measurement
equals
or
exceeds
the
sample­
specific
SQL
or
the
detection
limit
imposed
by
the
laboratory
(Ref
1,
Table
2­
3,
Sec.
2­
31.

HRS
Documentation
Record
05/
30/
0
1
23
McGaffey
and
Main
Groundwater
Plume
NM0000605386
GW
­
Likelihood
of
Release
BACKGROUND
DOMESTIC
WELLS
The
1
50
1
E.
Beech
Street
well
is
a
domestic/
irrigation
well
located
north/
northeast
of
the
identified
boundary
of,
the
ground
water
plume
(Ref.
3,
pp­
1­
2;
Ref
21,
p.
6;
Figure
A­
3).
This
well
was
sampled
by
the
NMJZD
in
1994
and
1995
(Ref.
11,
pp.
1­
5,41­
45).
The
total
depth
of
the
1501
E.
Beech
Street
well
is
approximately
220
feet
bgs
(Ref.
11,
p.
1).

The
1403
E.
Beech
Street
well
is
a
domestic/
irrigation
well
located
northhortheast
of
the
identified
boundary
of
the
ground
water
plume
(Ref
3,
pp.
1­
2;
Ref.
2
1,
p.
6;
Figure
A­
3).
This
well
was
sampled
by
the
NMED
in
1995,1996,
and
2000
(Ref.
16,
pp.
9­
17).
The
total
dep$
of
&e
well
has
been
measured
at
185
feet
bgs
and
the
screened
interval
of
this
well
is
165
feet
to
170
,8
feet
.
(Ref­
.
,
'4,
p.
28).

The
1503
E.
Holland
well
is
a
domestic
well
located
north
of
the
identified
boundary
of
the
ground
water
plume
(Ref
3,
pp.
1­
2;
Ref
2
1,
p.
6;
Figure
A­
3).
.This'well
was
sampled
by
the
NMED
in
1995
(Ref.
16,
pp.
20­
24).
The
total
depth
and
screened
interval
of
the
well
+e
&oG;
however,
most
of
the
domestic
wells
in
the
area
are
completed
mthe
shallow
alluvialaquifer
and
were
screened
fiomdepths
ranging
between
1
30
feet
to
180
feet
(Ref.
4,
pp.
5).
8
,

Even
though
these
wells
are
located
very
near
the
estimated
boundaries
of
the
ground
water
plume,
they
are
considered
to
be
located
outside
the
intluence
ofpotential'contmination.
Local
ground
water
flow
is
towards
the
~

southeast
which
would
be
away
from
these
$eks
(Ref
4,
p.
4;
Ref.
20,,
p.
5).
Further,
since
PCE
concen@
tions
have
either
been
non­
detect
or
below
the
.detection
limit
established
by
the
laboratory
combined
with
the
fact
that
PCE
is
not
a
naturally
o
c
h
g
substance
&the
environment,
these
wells
are
considered
representative
of
background
conditions
for
the
area.

BACKGROUND
RESULTS
­
DOMESTIC
WELLS
Hazardous
Substance
Concentration
in
ug/
L
(Detection
Limit)

Perchloroethene
ND
(MDL
=
1)
.
ND(
PQL
=
1)
ND
(PQL
=
1)

References
Ref.
16,
pp.
20­
24;
Ref.
4,
p.
5
Ref.
11,
pp.
41­
45;
Ref.
4,
pp.
Ref.
1
1,
pp.
2­
5;
Ref.
4,
p.
28
Notes:
ug/
L
microgramsperliter.
PQL
hactical
Quantitation
Limit;
used
for
comparison
purposes
bythe
lab
since
the
sample
was
not
analyzed
through
the
EPA
CLP
(Ref.

MDL
MethodDetection
Limit;
usedforcomparisonpurposesbythelabsincethe
sample
wasnotanalyzed
through
the
EPA
CLP
(Ref.
16,
11,
pp.
1­
5;
41­
45).

pp.
20­
24).

HRS
Documentation
Record
05/
30/
01
24
McGaffey
and
Main
Groundwater
Plume
NM0000605386
GW
­
Likelihood
of
Release
BACKGROUND
RESULTS
­
DOMESTIC
WELLS
(Continued)

Ref.
16,
pp.
17­
19
­
Notes:

ug/
L
micrograms
per
liter.
PQL
Practical
Quantitation
Limit;
used
for
comparison
purposes
by
the
lab
since
the
sample
was
not
analyzed
through
the
EPA
CLP
(Ref.

MDL
Method
Detection
Limit;
used
for
comparison
purposes
by
the
lab
since
the
sample
was
not
analyzed
through
the
EPA
CLP
(Ref.
16,

SDL
Sample
Detection
Limit;
usedfor
comparison
purposes
by
the
lab
since
the
sample
was
not
analyzed
through
the
EPA
CLP
(Ref.
16,
16,
pp.
1­
8).

pp.
9­
14).

pp.
1­
8,
14­
19).

HRS
Documentation
Record
05/
30/
01
25
McGaffey
and
Main
Groundwater
Plume
NM0000605386
GW
­
Likelihood
of
Release
BACKGROUND
MUNICIPAL
SUPPLY
WELLS
Municipal
supply
well
SRW
17
is
located
upgradient
and
southwest
of
the
former
dry
cleaning
facility
as
well
as
of
the
estimated
boundary
of
the
ground
water
plume
(Ref.
3,
pp.
1­
2).
Municipal
supply
well
SRW17
is
completed
within
the
carbonate­
rock
(artesian)
aquifer
at
a
total
depth
of
348
feet
bgs
(Ref
2
1,
pp.
1,6),
The
depth
to
water
has
been
measured
to
be
approximately
53
feet
in
this.
well
(Ref.
21,
p.
6).
Concentrations
of
PCE
in
municipal
supply
well
SRWl7
have
been
non­
detect
fiom
1
992
through
1999.

MUNICIPAL
SUPPLY
WELL
SRWI'I
SRW17
Ref.
17.
n.
33
POL
=
0.5
ND
02/
02/
94
OR­
94­
0287
SRW17
Ref.
17,
p.
32
MDL
=
1
.O
ND
.
04/
26/
93
OR­
93­
0858
SRW17
Ref.
17,
p
31
MDL
=
1
.O
mlL
jYD,
,
04/
15/
92
OR­
92­
0789
,.

SRW17
~
~~~

\a
171602
1011
3/
99
Ref.
17,
pp.
36­
37
SDL
=
0.5
,oND',,
'
OR­
9902234
SRW
17
Ref.
17,
pp.
34­
35
MDL
=
0.5
,
:.
,
ND',
10/
28/
96
,,.
'

Notes:

u
g
L
micrograms
per
liter.
MDLMethodDetection
Limit;
usedforcomparisonpurposes
by
the
.lab
since
the
sample
was
not
analyzed
through
the,
EPA'
CLP
(Ref.
17,

PQL
Practical
Quantitation
Limit;
used
for
comparison
purposes
by
the
lab
since
'the
sample
was
not
analyzed
through
the
:EPA
CLP
(Ref.
,,

,,

8
,

pp.
31­
32
and
34­
35).

17,
p.
33).

pp.
36­
37).
SDL
Sample
Detection
Limit;
used
for
comparison
purposes
by
$e
lab
since
the
sample
was
not
analyzed
through
the
EPA
CLP
(Rcf.
17,

HRS
Documentation
Record
05130/
01
26
McGaffey
and
Main
Groundwater
Plume
NM0000605386
GW
­
Likelihood
of
Release
RELEASE
WELLS
The
NMEiD
has
been
the
primary
agency
involved
in
the
investigationof
this
ground
water
plume.
The
NMED
discovered
the
ground
water
plume
inNovember
1994
followingthe
investigationof
a
leaky
underground
storage
tank
at
the
former
Pepsi
Cola
bottling
plant
(Ref.
20,
p.
4).
Ground
water
samples
collected
fiom
monitoring
wells
installed
as
part
of
the
investigation
conducted
at
the
former
bottling
plant
revealed
the
presence
of
hi&
concentrations
ofPCE
and
gasoline
constituents.
The
highest
concentration
of
PCE
were
observed
across
South
Main
Street
from
the
former
bottling
plant,
in
an
area
referred
to
as
E.
Iighland
Center
(Ref.
4,
p.
3).

A
large
dry
cleaning
fzility
occupied
a
building
located
at
1
107
South
Main
Street
of
the
Highland
Center.
Records
show
that
the
dry
cleaning
facility
operated
from
1956
until
1
963.
The
dry
cleaning
facility
was
known
by
the
nhme
of
Lee
Mack
Laundry
and
Dry
Cleaners
(Lee
Mack
Cleaners)
and
ceased
operations
some
time
in
1963
(Ref.
4,
pl
3;
Ref.
20,
p.
4).

Ground
water
samples
collected
&om
monitoring
wells,
private
domestic
wells,
and
municipal
supply
wells
used
to
document
an
observed
release
to
ground
water
have
been
presented
inthe
following
tables
by
sampling
event.
Release
samples
are
compared
to
the
most
appropriate
background
sample
when
available.
Background
.
samples
were
considered
.comparable
and
appropriate
based
on
a
similar
sample
date
sampled
and
similar
screened
interval
of
the
well.

The
five
municipal
supply
wells
used
to
evaluate
this
site
under
the
HRS
are
all
completed
within
the
carbonate­
rock
(artesian)
aquifer
at
depths
of
344
feet,
346
feet,
348
feet,
363
feet,
and
365
feet
bgs.
Depth
to
water
in
the
five
municipal
wells
have
been
measured
at
53
'feet,
74
feet,
82
feet,
87
feet,
and
115
feet
(Ref.
21,
p.
6).
Thus,
the
total
depths
*of
all
of
the
municipal
wells
are
similar.
Therefore,
the
municipal
well
,chosen
to
represent
background
(SR&
17)
can
be,
considered
comparable
to
the
other
four
municipal
wells
(SRW12,
SRW13,
SRW15,:
and,
SRW16).
I
The
extent
of
the
ground
water
plume
has
been
defined
by
ground
water
samples
meeting
the
observed
release
criteria
set
forth
in
the
HRS
Rule.
Ground
water
well
locations
have
been
depicted
on
Figure
A­
3
of
Attachment
A.

HRS
Documentation
Record
05/
30/
01
27
McGaffey
and
Main
Groundwater
Plume
NM0000605386
GW
­
Likelihood
of
Release
1995
DOMESTIC
WELL
S&
PLING
EVENT
In
1995,
the
NMED
identified
and
sampled
a
tog1
of
15'
domestic
and
higation
wells
located
downgradient
of
the
former
dry
cleaning
facility­
These
particular
wells
were
identified
by
the
NMED
through
a
well
record
search
and
door­
to­
door
surveys
(Ref.
4,
p.
4).
Ground
water
samples
were
collected
between
January
1995
and
June
1995
(Ref.
11,
pp.
6­
59).

At
this
time,
the
NMED
discovered
three
residences
whose
sole
source
of
water,
including
drinking,
was
fi­
om
their
domestic
wells.
Concentrations
of
PCE
m
two
of
the
three
wells
exceeded
the
MCL
for
PCE.
These
domestic
wells
were
completed
within
the
shallow
alluvial
aquifer
(Ref
4,
p
.5).
,The
NMED
provided
emergency
hding
to
close
these
wells
and
connect
these
residences
to
the,
City
,of
Roswell
municipal
supply
system
(Ref
5,.
p.
2;
Ref.
8,
p.
1).
The
three
domestic
wells
whichwere
closed
included
the
following
wells:.
2305
S.
Cahoon,
1706
S.
Atkinson,
and
1
801
S.
Atkinson.
It
shoddbe
noted
that
wen
though
the
wells
wek'closed
for
drinking
water
supplies,
the
wells
were
not
plugged
in
'order
to
continue
the
collection
of
samples
h
m
these
weils
in
an
effort
to
'monitor
the
characteristics
of
the
PCE
contamination.
,
'

~.
1995
DOMESTIC
WELL
SAMPLING
RESULTS
,.
,

,,

I.
'
b'
.

Hazardous
Substance
,m
*

Concentration
in
ugii
(Detection
Limit)
,
,
*,
'8
Perchloroefhene
60
(MDL
=
1)
79
(MDL
=
1
)
105
(MDL
=
1)

Refmces
Ref.
11,
pp.
16­
20;
Ref.
4,
p.
5Ref.
11,
pp.
11­
15;
Ref.
4,
p.
5
Ref.
11,
pp.
6­
10;
Ref.
4,
p.
5
1L
­
Notes:

ug/
L
micrograms
per
liter.
MDL
MethodDetection
Limit;
used
for
comparison
purposes
by
the
lab
since
the
sample
was
not
analyzed
through
the
EPA
CLP
(Ref.
1
1
,
'
t
"

pp.
6­
10).

HRS
Documentation
Record
05/
30/
01
28
McGaffey
and
Main
Groundwater
Plume
NM0000605386
GW
­
Likelihood
of
Release
1995
DOMESTIC
WELL
SAMPLING
RESULTS
(Continued)

Hazardous
Substance
~
Concentration
in
ug/
L
(Detection
Limit)

Perchloroethene
40
(MDL
=
1)
6.10
(MDL
=
1)
1
I
Ref.
11,
pp.
26­
30;
Ref.
4,
pp.
28,
79
I
Ref.
11,
pp.
36­
40;
Ref.
4,
p.
29,
79
Hazardous
Concentration
in
ug/
L
(Detection
Limit)
I
Perchloroethene
I
1
References
1
Ref.
11,
p
ug/
L
micrograms
per
liter.
MDL
Method
Detection
Limit;
used
for
c(
pp.
36­
59).
260.00
(MDL
=
10)
I
53.00
(MDL
=
5)
,
II
mison
purposes
by
the
lab
since
the
sample
was
not
analyzed
through
the
EPA
CLP
(Ref.
11,

HRS
Documentation
Record
05/
30/
01
29
McGafSey
and
Main
Groundwater
Plume
NM0000605386
GW
­
Likelihood
of
Release
1995
GROUND
WATER
INVESTIGATION
A
limited
ground
water
investigation
was
conducted
m
1995
by
the
NMED.
The
ground
water
investigation
focused
on
the
area
surrounding
the
former
dry
cleaning
facility.
A
total
of
13
monitoring
wells
were
installed
during
this
investigation:
ED95­
1
through
ED95­
13.
Shallow,
intermediate,
and
deep
ground
water
monitoring
wells
were
installed
(Ref
4,
pp.
6­
7).
Shallow
ground
water
wells
are
classified
as
those
wells
completed
between
40
feet
and
60
feet
bgs
and
screened
approximately
5
'feet
to
10
feet
below
the
top
of
the
shallow
aquifer
(Ref.
9,
p.
6).
Intermediate
wells
are
classified
as
$hose
wells
completed
between
70
feet
and
95
feet
bgs
and
screened
approximately
20
feet
to
45
feet
below
the
top
of
the
shallow
aquifer
(Ref
9,
p.
6).
Deep
wells
are
classified
as
those
wells
completed
between
145
feet
and'
155
feet
bgs
and
screened
approximately
1
00
feet
below
the
top
of
the
shallow
aquifa
(Ref
9,
p.
6).
Grouid
water
samples
were
collected
fiom
these
monitoring
wells
between
September
and
November"
1995
(Ref.
'
1
1,
pp.
60­
106).
8
,
,
.

1995
GROUND
WATER
INVESTIGATION
RESULTS
Hazardous
Substance
Concentration
in
ug/
L
(PQL)

Perchloroethene
9,100
(100)
14,000
(100)
230
(5)

References
Ref
1
1
,
pp.
69­
13
;
Ref.
4,
p.
Ref.
11,
pp.
65­
68;
Ref.
4,
p.
35;
Ref.
11,
pp.
60­
64;
Ref.
9,
p.
2
1
~
~
~~
~
~~~
~~~~

Hazardous
Substance
Concentration
in
ug/
L
(PQL)

Perchloroethene
1,300
(25)
510
(100)

Rdxz~~
ces
Ref.
11,
pp.
84­
88;
Ref
4.
p.
35;
Ref.
9,
p.
30
Ref.
1
1
,
pp.
74­
78;
Ref.
9,
p.
28
Notes:

ug/
Lmicrograms
per
liter.
PQLPracticalQuantitation
Limit;
usedfor
comparison
purposes
by
the
lab
since
the
sample
was
not
analyzed
through
$e
EPA
CLP
(Ref.
11,
pp.
60­
88).

HRS
Documentation
Record
05/
30/
01
30
McGaffey
and
Main
Groundwater
Plume
NM0000605386
GW
­
Likelihood
of
Release
1995
GROUND
WATER
INVESTIGATION
RESULTS
(Continued)

Concentration
in
ug/
L
(PQL)

37
.OO
(1)
25,000
(1,000)

Ref11,
pp.
94­
97;
Ref.
Ref.
1
1
,
pp.
98­
101;
4,
p.
35;
Ref.
9,
p.
32
Ref.
4,
pp.
7,34,45
Notes:
!,,,

ugL
'
micrograms
per
liter.
PQLPracticalQuantitationLimit;
used
for
comparisonpurposes
by
the
lab
since
the
sample
was
not
analyzed
through
the
EPA
CLP
(Ref.
:,,,
.
11,
pp.
89­
106).

HRS
Documentation
Record
05/
30/
01
31
McGaEey
and
Main
Groundwater
Plume
NM0000605386
GW
~

Likelihood
of
Release
DECEMBER
1995
SAMPLING
EVENT
The
'ED95'
series
monitoring
wells
installed
by
the
NMED
were
re­
sampled
in
December
1995
in
an
effort
to
continue­
to
monitor
the
PCE
contamination
in
the
ground
water
(Ref.
1
1,
pp.
107­
130).
Presented
in
the
following
tables
are
the
analytical
results
fiom
the
ground
water
samples
collected
fromthe
monitoring
wells
by
the
NMED
in
December
1995.

DECEMBER
1995
SAMPLING
RESULTS
I
Hazardous
Substance
I
Concentration
in
ug.
L
(§
DL)

Perchloroethene
1,400
(100)
15,000
(1,000)

References,
I
Ref.
11,
pp.
113­
114,
118;
Ref.
4,
p.
35;
Ref.
9,
Ref.
11,
pp.
110­
111,
115;,
Ref.
4,
p:
35;
Ref.
9,
p.

Hazardous
Substance
Concentration
in
ug/
L
(SDL)

Perchloroethene
220
(5
)
8,800
(200)
900
(50)

References
Ref.
11,
pp.
122­
123,
127;
Ref.
Ref.
11,
pp.
119­
120,
124;
Ref.
Ref.
11,
pp.
116­
117;
Ref.
4,
p.

u
g
L
micrograms
per
liter.
§DL
Sample
Detection
Limit;
usedforcomparisonpurposes
by
the
lab
since
the
sample
was
not
analyzed
through
the
EPA
CLP
(Ref.
11,
pp.
107­
124).

HRS
Documentation
Record
05130l01
32
McGaffey
and
Main
Groundwater
Plume
NM0000605386
GW
­
Likelihood
of
Release
DECEMBER
1995
SAMPLING
RESULTS
(Continued)

Hazardous
Substance
Concentration
in
ug/
L
(SDL)

Percldoroethene
41
(1)
7,000
(200)
56
(1)

References
Ref.
11,
pp.
128­
129;
Ref.
4,
p.
Ref.
11,
pp.
131­
132,136;
Ref.
Ref.
11,
pp.
125­
126;
Ref.
4,
p.

HRS
Documentation
Record
05/
30/
01
33
McGafky
and
Main
Groundwater
Plume
NM0000605386
GW
­
Likelihood
of
Release
SEPTEMBER
1998
MONITORING
WELL
SAMPLING
EVENT
The
NIvlED
pdormed
ground
water
sampling
of
the
'ED95'
series
monitoring
wells
again
in
September
1998
(Ref.
12,
pp.
1­
26).
It
should
be
noted
that
the
monitorjng
wells
do
not
appear
to
have
been
sampled
on
a
routine
basis
between
the
period
of
1995
and
1998.

SEPTEMBER
1998
MONITOIUNG
WELL
RESULTS
I
a
I
I
I
Hazardous
Substance
,
.,
,
,
?'

"
'
Concentration
in
ug/
L
(SDL)
"
,

Perchloroethene
4,599
(100)
1,301
(100)
46.8
(1)

Referencff
Ref.
12,
pp.
1­
2;
Ref.
9,,
p.
21
i
,,
I
'
,
'
//
,
,

Ref.
12,
pp.
3­
4
Ref.
4,
p.
35;
Ref.
12,
pp.
3­
Q
Ref.
4,
p.
35;

Hazardous
Substance
Concentration
in
ug/
L
(SDL)

Perchloroethene
13,132.5
(250)
78.1
(20)
6,149
(1,000)

Refmces
Ref.
12,
pp.
1
1­,
12;
Ref.
4,
p.
Ref.
12,
pp.
9­
10;
Ref.
4,
p.
35;
Ref.
12,
pp.
1­
8
;
Ref.
4,
p.
35;

HRS
Documentation
Record
05/
30/
01
34
McGaffey
and
Main
Groundwater
Plume
NM0000605386
GW
­
Likelihood
of
Release
SEPTEMBER
1998
MONITORING
WELL
RESULTS
(Continued)

N&

u
g
k
.
micrograms
per
liter.
SDL
Sample
Detection
Limit;
used
for
comparison
purposes
by
the
lab
since
the
sample
was
not
,analyzed
through
the
EPA
CLP
(Ref.
12,
pp.
13­
26).

HRS
Documentation
Record
05/
30/
01
35
McGaffey
and
Main
Groundwater
Plume
NM0000605386
GW
­
Likelihood
of
Release
MAY
1999
MONITORING
WELL
EVENT
The
Nh4ED
performed
ground
water
sampling
ofthe
'ED95'
series
ofmonitoring
wells
again
in
May
1999
(Ref.
1
3,
pp.
1­
45).
Based
on
the
analytical
results
fiom
these
ground
water
samples,
the
presence
of
PCE
continues
to
be
detected
in
the
same
.monitoring
wells.

MAY
1999
MONITORING
WELL
RESULTS
Hazardous
Substance
Concentration
in
ug/
L
(SDL)

Perchloroethene
,
,,
,,

45.2
(1)
'
,,
1.
'
,,
'
'
I
1,420
(50)
'
'
11
;180
(200)

References
Ref.,
1,3,
pp.,
7:
9
Ref.
4,
p.
35;
RefU!
3,
pp.,
4­
6;
Ref.
4,
p.
35;
Ref.
13,
pp.
1­
3;
Ref.
9,
p.
21
,
,

,
Ref.
'b.
o.
24
Ref.
9
.:~.
23
,­
..
.,
8
,
,

­.

Hazardous
Substance
,
Concentration
in
ug/
L
(SDL)

Perchloroethene
.
4,100
(500)
,
)I
109
(40)
.
690
,(
20)
'

References
Ref.
13,
pp.
16­
18
;
Ref.
4,
p.
Ref.
13,
pp.
13­
15;
Ref.
4,
p.
Ref.
13,
pp.
10­
12;
Ref.
4,
p.
35;

ug/
L
micrograms
per
liter.
SDL
Sample
Detection
Limit;
usedforcomparisonpurposes
by
the
lab
since
the
sample
was
not
analyzed
through
the
EPA
CLP
(Ref.
13,

pp.
1­
18).

HRS
Documentation
Record
05/
30/
01
36
McGaffey
and
Main
Groundwater
Plume
NM0000605386
GW
­
Likelihood
of
Release
MAY
1999
MONITORING
WELL
RESULTS
(Continued)

Ref.
13,
pp.
22­
24;
Ref.
4,
p.
Ref.
13,
pp.
25­
27;
Ref.
4,
p.

ug/
L
microgramsper
liter.
SDL
Sample
Detection
Limil;
used
for
comparison
purposes
by
the
lab
since
the,
sample
was
not
analyzed
through
the
EPA
CLP
(Ref.
13,
pp.
19­
45).

HRS
Documentation
Record
05/
30/
01
37
McGaffey
and
Main
Groundwater
Plume
NM0000605386
GW
­
Likelihood
of
Release
APRIL
2000
SAMPLING
EVENT
The
NMED
conducted
a
sampling
event
m
April
2000
inwhichboththe
'ED95'
series
monitoring
wells,
domestic
wells,
and
irrigations
wells
were
sampled
(Ref
14,
pp.
1
:72).
The
wells
are
located
downgradient
ofthe
former
dry
cleaning
facility.
Well
locations
have
been
depicted
I
.
on
Figure
A­
3
of
Attachment
A.

APRIL
2000
DOMESTIC
WELL
aSULTS
,.

I
,
4
,
,,
,

Hazardous
Substance
I
'
:
.,
'
,I
,
.
'
Conceniration
in
ug/
L
(SDL)
II
Perchloroethene
154
(5)

,*

Refer&=,
Ref.
14,
pp.,
1­
3;
Ref.
'4,
p
.
29,
79
Ref.
14,
pp.
4­
6;
Ref.,
4,
pp.
'28,
79
,
,.1
<'
,I
,

APRIL
200p
I\;
PONITO@
NG
WELL
RESULTS
.,
~,

I
*,.
,
8
,
,
..

,I
I
,
1.
,,",'
,
,,i
,
.
,,
4
'
,
.,
,

Notes:
I
!1
.,
ug/
L
micrograms
per
liter.
SDL
Sample
Detection
Limit;
used
for
comparison
purposes
by
the
lab
since
the
sample
was
not
analyzed
,through
the
EPA
CLP
(Ref
14,
pp.
1­
15>.
1
8
,

,.

I
,

HRS
Documentation
Record
05/
30/
01
38
McGaffey
and
Main
Groundwater
Plume
NM000060.5386
GW
­
Likelihood
of
Release
APRIL
2000
MONITORING
WELL
RESULTS
(Continued)

Hazardous
Substance
Concentration
in
ug/
L'(
SDL)

Perchloroethene
I
1,928
(200)

I
I
Ref.
14,
pp.
16­
18;
Ref.
4:
p.
35;
Ref.
9,
p.
24
I
Ref.
14,
pp.
22­
24
;
Ref.
4,
p.
35;
Ref.
9,
p.
27
Ref.
14,
pp.
34­
36;
Ref
4.
p.
35;
Ref.
14,
pp.
37­
39;
Ref.
4,
p.
Ref.
14,
pp.
40­
42;
Ref.
4,
p.

Notes:
­

ug/
Lmicrogramsper
liter.
SDL
Sample
Detection
Limit;
usedfor
comparison
purposes
by
the
lab
since
the
sample
was
not
analyzed
through
the
EPACLP
(Ref.
14,
pp.
25­
42).

HRS
Documentation
Record
05/
30/
01
39
McGaffey
and
Main
Groundwater
Plume
NM0000605386
GW
­
Likelihood
of
Release
APRIL
2000
MONITORING
WELL
RESULTS
(Continued)

Hazardous
Substance
I.
,
Concenhation
in
ugiL
(SDL)

Perchloroethene
5,270
(500)
I
'4,880
(500)
..

I
R
e
f
m
m
I
Ref.
14;
pp.
43­
45;
Ref.
4,
pp.
7,
34,
$5
Ref.
14,
pp.
46­
48;
Ref.
4,
pp.
7,
34
I
,
'
Hazardous
Suhstance
I
Concentrdtion
i
n
u
d
L
(SDL)
,i
I
,
,
,8
~~~

Percuorckthene
671
(50)
9,520
(500)
158
(10)

References
Ref.
14,
pp.
49­
51;
Ref.
4,
pp.
7,
Ref.
14,
pp.
55­
57;
Ref.
4,
p.
Ref.
14,
pp.
52­
54;
Ref.
4,
pp.
.
,,
,

34
14
I.
34.
45
,
­
,I
/

Notes:

ug/
L
micrograms
per,
liter.
SDL
Sample
Detection
Limit;
used
for
comparison
purposes
by
the
lab
since
the
sample
was
not
analyzed
tbrobgh
'
t
h
e
E
p
A
C
L
p
(R
e
f
.
14,
.,
,

,I
I
pp.
43­
57).
'
I
'I
,.

HRS
Documentation
Record
05/
30/
01
40
McGaEey
and
Main
Groundwater
Plume
NM0000605386
SEPTEMBER
2000
DOMESTIC
WELL
RESULTS
GW
­
Likelihood
of
Release
I
Perchloroethene
97
(2'
I
I
I
References
I
Ref
14,
pp.
67­
69
Ref
4.,
p.
28
1
Ref.
14,
pp.
70­
72;
Ref
4.,
p.
5
Notes:
­

ug/$
micrograms
per
liter.
SDL
Sample
Detection
Limit;
used
for
comparison
purposes
by
the
lab
since
the
sample
was
not
analyzed
through
the
EPA
CLP
(Ref.
14,
pp.
58­
72).

HRS
Documentation
Record
05130101
41
McGaEey
and
Main
Groundwater
Plume
NM0000605386
GW
­
Likelihood
of
Release
MARCH
2001
SAMPLING
EVENT
The
W
E
D
conducted
a
ground
water
samplmg
event
m
March
200
1
in
which
the
'ED95'
series
monitoring
wells
were
sampled
(Ref
15,
pp.
1­
48).
These
monitoring
wells
continue
to
exhibit
contamination
by
PCE.

MARCH
2001
MONITORING
WELL
RESULTS
Hazardous
Substance
Concentration
in
uglL
(SDL)

Perchloroethene
,,

50.6
(10)
13,100
(100)
1
,
,.
910
(5)

I
­~
~~~
~
~

References
I
Ref.
15,
pp.
1­
3;
Ref.
9:
p.
21
I
Ref.
15,
pp.
476;
Ref.
4,
p.
35;
1'
Ref.
15,
pp.
7­
9;
lRef.
4,
p.
35;
I
I
Hazardous
Substance
I
Concentration
in
udL
(SDL)
'
II
I
Perchloroethene
1,822
(100)
3,100
(20)

II
I
Ref.
15,
pp.
10­
12;
Ref.
4,
p.
35;
Ref.
9,
p.
24
Ref
15,
pp­
16­
18;
Ref.
4,
p.
35;
Ref.
9,
p.
27
ug/
L
micrograms
per
liter.
SDL
Sample
Detection
Limit;
used
for
comparison
purposes
by
the
lab
since
the
sample
was
not
analyzed
through
the
EPA
CLP
(Ref.
1.5,
pp.
1­
18).

HRS
Documentation
Record
05/
30/
01
42
McGaEey
and
Main
Groundwater
Plume
NM0000605386
GW
­
Likelihood
of
Release
MARCH
2001
MONITORING
WELL
RESULTS
(Continued)

Ref.
15,
pp.
31­
33:
Ref.
4,
p.

Ref.
15,
pp.
40­
42;

ug/
L
micrograms
per
liter.
SDL
Sample
Detection
Limit;
used
for
comparison
puposes
by
the
lab
since
the
sample
was
not
analyzed
through
the
EPA
CLP
(Ref.
15,
pp.
19­
48).

HRS
Documentation
Record
05/
30/
01
43
McGaffey
and
Main
Groundwater
Plume
NM0000605386
GW
­
Likelihood
of
Release
MUNICIPAL
SUPPLY
WELL
INVESTIGATION
The
City
of
Roswell
has
four
contaminated
municipal
supply
wells
located
withip
a
4­
mile
radius
of
the
former
dry
cleaning
facility:
SRW12,
SRW13,
SRW15,
and
SRWl6
(Ref.
21,
pp.
1­
6).
These
four
wells
are
active
municipal
supply
wells
for
the
City
of
Roswell,
which
proyide
drinking
water
to
the
residents
of
Roswell.
All
of
the
City
of
Roswell
municipal
supply
wells
obtain
their
water
fi­
om
the
carbonate­
rock
(artesian)
aquifer,
which
is'hydraulicdy
connected
to
the
shallow
alluvih
aquifer
(Ref.
19,
p.
10;
Ref.
21,
p.
1).
Further,
the
carbonate­,
rock
(artesian)
aquifer
and
the
hydraulically
comiected
alluvial
aquifer
together
comprise
the
Roswell
Basin
Aquifer
system.
This
system
has
been
designated
as
a
karst
aquifer
by
the
USGS
(Ref
19,
p.
1,
O).
1
.,

.
,,

.
._
>
..
.I
.

,I
PCE
has
been
detected
intermittently
mmunicipal'supply
wells
SRW12
and
SRW
13
since
1995.
PCE
has
been
deteeted
consistently
m
municipal
supply
wells
SRW
15
and
SRW
16
since
1993.
However,
the
concentrations
of
PCE
detected
in
the
municipal
supply
wells'
h&
e
been
below
the
F,
ederalMCL
of
5
ug/
L
for
PCE.
'
Under
the
Federal
SDWA,
no
treatment
is
r
e
q
~e
d
utitil
the'MCL
is
reached
{Ref.
4,
p.
5).
"
I.
,
i
I
,,

I
,.

A
discussion
of
the
municipal
supply
well­
chosen
to
represent
background
conditions,
SRWl7,
is
presented
in
Section
3.1.1
(Observed
Release,
Background
Domestic
Wells)
of
this
documentation
record.
Ground
water
samples
were
collected
from
municipal
supply
well
SRW17
between
the
years
of
1992
aqd
:1999
(Ref.
17,
pp.
3
1
­3
7).
Concen&
ti&
s
of
PCE
have
not
been
detected,
$I
any
of
+e
b
u
n
d
water
samples
collected.
Thus,
the
background
levels
for
the
municipal
supply
wells
e
c
h
are
completed
m
the
carbonate­
rock
(artesian)
,
aquifer
is
considered
to
be
non­
detect.
,
'I
I
,
,
.
,
.,
10%

,
P
'

,
ii:
,
,

HRS
Documentation
Record
05/
30/
01
44
McGaffey
and
Main
Groundwater
Plume
NM0000605386
GW
­
Likelihood
of
Release
MUNICIPAL
SUPPLY
WELL
ANALYTICAL
RESULTS
­
Notes:

ugiL
micrograms
per
liter.
PQL
Practical
Quantitation
Limit;
used
for
comparison
purposes
by
the
lab
since
the
sample
was
not
analyzed
through
the
EPA
CLP
(Ref.

MDL
Method
Detection
Limit;
usedfor
comparison
purposes
by
the
lab
since
the
sample
was
not
analyzed
through
the
EPA
CLP
(Ref.
17,

SDL
Sample
Detection
Limit;
used
for
comparison
purposes
by
the
lab
since
the
sample
w
a
not
analyzed
through
the
EPA
CLP
(Ref.
17,
17,
pp.
1,7,
and
14).

pp.
2­
3,
6,
8­
9,
12­
13,
5
,
and
18­
21).

pp.
4­
5,
10­
11,
and
16­
17).

HRS
Documentation
Record
05/
30/
01
45
McGaffey
and
Main
Groundwater
Plume
NMOO00605386
GW
­
Likelihood
of
Release
MUNICIPAL
SUPPLY
WELL
ANALYTICAL
RESULTS
(Continued)

­
Notes:
.I
u
g
L
micrograms
per
liter.
,
'
I
PQL
F'ractical
Quantitation
Limit;
used
for
comparison
purposes
by
the
lab
since
the
sample
was
not
analyzed
through
the
qPA
CLP
(Ref.

MDL
Method
Detection,
Limit;
used
for
comparison
purposes
by
the
lab
since
the
sample
was
not
analyzed
through
the
EPA;
CLP
(Ref.
17,

SDL
Sample
Detection
Limit;
used,
for
comparison
purposes
by
the
lab
since
the
sample
was
not
analyzed
through
'the
EPA
CLP
(Ref.
17,
17,
p.
24).

pp.
22­
23,
25,
and
28­
30).
'
,
'
I
I
pp.
26­
27).

HRS
Documentation
Record
os/
30/
01
46
McGalTey
and
Main
Groundwater
Plume
NM0000605386
GW
­
Likelihood
of
Release
Attribution
The
McGaffey
and
Main
Ground
Water
Plume
site
i$
located
in
Roswell,
Chaves
County,
New
Mexico
near
the
intersectionof
South
Main
Street
and
McGaffey
Street.
The
site
is
located
in
an
area
ofmixed
commercialand
industrialuse.
Residential
areas
are
located
M
e
r
south
of
the
site.
Essentially,
there
is
no
open
or
undeveloped
land
within
the
immediate
vicinity
of
the
site
(Ref.
3
,
pp.
1­
3).
Perchloroethylene
(PCE)
contaminationhas
been
identified
throughout
the
alluvial
aquifer
as
a
ground
water
plume
that
extends
from
beneath
the
intersection
of
McGaffey
and
Main
in
a
southeasterly
direction
(Ref
4,
p.
3).

Theboundaryofthegroundwaterplume
is
definedbygroundwatersamplescollectedf?
omdomestic,
monitoring,
and
municipal
supply
wells.
The
precise
extent
ofthe
plume
has
not
yet
been
identified,
but
appears
to
measure
approximately
one
mile
in
length.
As
such,
only
one
ground
water
plume
has
been
considered
for
the
purposes
of
this
documentation
record
since
the
contaminants
identified
wih
the
ground
water
wells
are
the
same.
There
are
at
least
three
other
ground
water
plumes
in
the
Roswell
Bash'however,
it
is
not
known
at
this
time
if
these
plumes
are
commingled
(Ref.
6,
p.
3;
Ref
8,
p.
2).

The
NMED
has
been
the
primary
agency
involved
in
the
investigation
of
this
groid
water
plume.
The
NMED
discovered
the
ground
water
plume
inNovember
1
994
following
the
investigation
of
a
leaky
underground
storage
tank
at
the
,former
Pepsi
Cola
bottling
plant.
Ground
water
samples
collected
fiom
monitoring
wells
installed
as
part
of
the
investigation
conducted
at
the
former
bottling
plant
revealed
the
presence
of
high
concentrations
of
PCEand
gasoline
constituents.
The
highest
concentrations
ofPCE
were
observed
across
South
Main
Street
fiom
the
former
bot@
ng
plant,
in
an
area
referred
to
as
Highland
Center
(Ref
4,
p.
3).
".
..

8
,

The
source
of
the
ground
water
contamination
is
unidentified
However,
there
are
several
potential
sources
of
the
contamination
m
the
area.
Previous
studies
have
indicated
that
operations
at
the
former
Lee
Mack
dry
cleaning
fxility
may
have
contxibuted
to
the
ground
water
plume,
'but
no
specific
sources
at
the
former
facility
property
have
been
identified
(Ref
4,
p.
3;,
Ref
5
,
p.
1).
Extremely
high
concentrations
of
PCE
have
been
detected
in
a
monitoring
well
located
approximately
40
feet
southeast
of
the
former
dry
cleaning
facility
suggest
that
past
disposal
practices
at
the
dry
cleaning
facility
may
have
including
discharging
waste
PCE
behind
the
facility
(Ref.
6,
p.
1).
PCE
has
been
detected
in
this
well
at
concentrations
up
to
25,000
micrograms
per
liter
(ugiL)
(Ref
5,
p.
1;
Ref.
6,
p.
1).
During
a
site
investigation
in
1994,
following
a
review
of
the
locations
of
the
PCE
plume
and
the
local
dry
cleaning
facilities,
it
appeared
that
the
PCE
contamination
could
be
a
result
of
PCE
discharges
to
the
sewer
line
locationman
alley
east
o
f
W
Street
(Ref.
20,
pp.
5­
6).
Possible
leakage
of
these
sewer
lines
could
have
contributed
to
the
discharge
ofthe
PCE
to
the
subsurface
ground
water
(Ref
4,
p.
3;
Ref
6,
p.
1;
Ref.
20,
p.
6).
In
addition
to
Lee
Mack
Cleaners,
there
are
at
least
six
other
dry
cleaning
facilities
which
operated
m
the
area
at
some
time
m
addition
to
several
auto
service
facilities
which
may
have
also
used
chlorinated
solvents
(Ref.
4,
p.
52­
54,
Ref.
20,
p.
4).

HRS
Documentation
Record
05/
30/
01
47
McGafTey
and
Main
Groundwater
Plume
NM0000605386
GW
­
Waste
Characteristics
The
NMED
has
conducted
several
soil
and
ground
water
investigations
in
the
area,
however,
the
precise
extent
%ofthe
PCE
contaminationm
the
ground
water
has
not
yet
been
determined.
PCE
is
a
manufactured
product
and
the
primary
solvent
used
in
commercial
and
industrial
dry
cleaning
(Ref
22,
p.
1).
PCE
is
not
ubiquitous
or
naturally
occurring
within
the
environment.

3.1.2
Potential
to
Release
­
Not
Scored
According
to
the
HRS
Rule,
potential
to
release
is
only
scored
if
an
observed
release
cannot
be
established
for
the
aquifer
of
concern
(Ref
I,
Sec.
3.1.2).
As
such,
the
Potential
to
Release
for
the
ground
water
migration
pathway
was
not
evaluated
because
an
observed
release
has
been
documented
for
the
Roswell
and
5th
Street
Ground
Water
Plume
site
(Ref
1,
Sec.
3.1.1).

3.2
WASTECHARACTERISTICS
The
waste
characteristics
factor
category
for
an
aquifer
is
evaluated
based
on
two
factors:
toxicity/
mobility
and
hazardous
waste
quantity.
Only
those
hazardous
substances
that
are
mailable
to
the
ground
water
migration
pathway
canbe
considered
(Ref,
1,
Sec.
3.2).
PCE
is
the
only
hazardous
substance
that
is
considered
available
to
the
ground
water
migration
pathway
for
this
site.
A
discussion
of
each
separate
factor
value
is
presented
in
the
following
subsections.
,Factor
values
for
toxicity
and
mobility
are
presentedcin
the
following
table.=
well
as
calculations
for
the
combined
toxicityhnobility.
.,

Notes:

'
Value
assigned
using
the
Superfind
Chemical
Data
Matrix
(Ref.
2).
A
mobility
factor
value
of
1
is
assigned'since
perchloroethylene
meets
the
criteria
for
an
observed
release
to
ground
water
(Ref.
1
,
Sect.
3.2.1.2).

HRS
Documentation
Record
05/
30/
01
48
McGaffey
and
Main
Groundwater
Plume
NM0000605386
GW
­
Waste
Characteristics
3.2.1
ToxicityMobility
3.2.1.1
Toxicity
According
to
the
HRS
Rule,
toxicity
is
evaluated
for
those
hazardous
substances
at
the
site
that
are
available
to
a
pathway
being
scored
(Ref
1,
Sec.
2.4.1.1).
Toxicity
values
for
hazardous
substances
are
assigned
in
the
SuperfundChemicalDataMatrix(
SCDM)
andhavebeenpresented
in
atable
in
Section3.2of
this
documentation
record
(Ref.
2).

3.2.1.2
Acdording
to
the
HRS
Rule,
for
any
hazardous
substance
that
meets
the
criteria
for
an
observed
release
by
chemical
Bnalysis
to
one
or
more
aquifers
underlying
the
source(
s)
at
the
site,
regardless
of
the
aquifer
being
evaluated,
a
mobility
factor
value
of
1
is
assigned
(Ref
1,
Sec.
3.2.1.2).

3.2.2
Hazardous
Waste
quantity
AccOrding
to
&e
HRS
Rule,
for
all
migrationpathwayshazardousconstituentquantityisnotadequately
determined
adifany
Level1
or
Level11
concentrations
are
present
for
the
pathway
being
evaluated,
thena
value
of
100
is
assigned
as
the
hazardous
waste
quanti6
factor
value
forthatpathway(
Ref
1
,
Sec.
2.4.2.2).
As
swh,
since
the=
are
targets
which
are
subject
to
Level
I
and,
Level
II
concentrations,
a
pathway
hazardous
waste
q&
tity
factor
value
of
100
is
assigned.

Pathway
Hamdous
Waste
Quantity
Factor
Value:
100
3.2.3WasteCharacteristicsFactorCategoryValue
According
to
the
HRS
Rule,
the
waste
characteristics
factor
category
value
is
derived
by
multiplying
the
toxicity/
mobility
factor
value
by
the
hazardous
waste
quantity
factor
value
(Ref.
1,
Sec.
3.2.3).
Based
on
this
product,
a
value
from
Table
2­
7
of
the
HRS
Rule
is
assigned
to
the
waste
characteristics
factor
category
(Ref
1,
Sec.
3.2.3).
'
'

The
toxicity/
mobility
factor
value
of
100
multiplied
by
the
hazardous
waste
quantity
factor
value
of
100
equals
a
product
of
10,000.
According
to
Table
2­
7
of
the
HRS
Rule,
a
product
of
10,000
equates
to
a
waste
characteristics
factor
category
value
of
10
(Ref.
1
,
Table
2­
7).
,,

ToxicityMobGity
Factor
Value
(100)
x
Hazardous
Waste
Quantily
Factor
Value
\loo):
10,000
Waste
Characteristics
Factor
Value:
10
HRS
Documentation
Record
05/
30/
01
49
McGaffey
and
Main
Groundwater
Plume
NM0000605386
GW
­
Targets
3.3
TARGETS
,.

The
City
of
Roswell
is
located
in
the
northern
portion
of
the
Roswell
Ground
Water
Basin.,
Large
volumes
of
ground
water
are
withdrawn
&om
a
shallow
alluvial
aquifer
and
underlying
carbonate­
rock
(artesian)
aquifer
in
the
Roswell
Basin.
The
carbonate­
rock
aquifer
and
the
hydraulically
connected
aquifer
inthe
alluvium
form
the
Roswell
Basin
Aslllfer
system,
whichis
the
aquifa
systembeingwaluated
for
this
site.
(Ref.
19,
p.
10).
Further,
the
aqdiers
of
the
Roswell
Ground
Water
Bas@
have
been
classified
as
karst
aquifers
by
the
USGS
(Ref.
19,
p.
10).

Because
of
the
dissolution
cavities
and
the
channels
that
comprise
thq
karst
aquifers
are
considered
extremely
vulnerable
to
contamination.
Themovementofhazardoussubstancesreleasedintokarstaquifersishighly
unpredictable,
and
transport
over
relatively
long
distances
caq
occur
very
rapidly
(Ref
10,
p.
4).
The
City
of
Roswell's
primary
chinking
water
supply
resides
mthe
carbonate­
rock
(artesian)
aquifer
and
the
municipal
supply
wells
are
completed
within
the
carbonate­
rock
(@
esianj
.,
aquifer
(Ref.
2
1,
p.
1).

Interaquifkr
leakage
occurs
between
the
alluvial
aquser
and
the
carbonate­
rock
(artesian)
aquifer
through
the
Queen
aquitard
(1
8,­
p.
8).
Leakage
is
generally
greatest
in
the
vicinity
of
Roswell.
Prior
to
$e
development
of
.
irrigationwells,
water
leaked
vertically
upward
fiomthe
carbonate
aquifer
to
the
alluvial
aquifer.
At
present,
the
large
drawdown
of
the
potentiometric
surface
m
the
dFQonate­
rock
aquifer
during
the
summer
irrigation
season
reverses
the
direction
of
vertical
leakage
(i.
e.,
le&
ge
6
downward
@om
the
alluvial
W
e
r
into
the
carbonate­
rockaquifer)
(
Ref.
18,
pp.
8­
9j.
.­

The
City
of
Roswell
municipal
supply
system
is
composed
of
20
municipal
supply
wells
that
are
coppleted
within
the
carbonate­
rock
(artesian)
aquifer.
According
to
the
City
of
Roswell
municipal
supply
systtkn
manager,
none
ofthe
20
municipalwells
contribute
more
than40
percent
of
the
overall
production.
Further,
various
wells
serve
as­
standby
wells
on
a
rotating
basis
(Ref
2
1
,'
p.
1
).
'
Based
on
information
provided
by
the
City
of
Roswell,
there
are
4
City
of
Roswell
municipal
supply
wells
located
Within
a
4­
mile
radius
of
the
ground
water
plume
in
which
PCE
has
been
detected
(Refs.
12;
13;
15;
16;
17;
21;
pp.
1
­$.

During
the
Nh4ED's
1995
Domestic
Well
investigation,
t
h
r
~
residences
were
discovered
whose
sole
source
of
water
(including
drinking)
was
fi­
om
their
domestic
wdls
which
are
completed
m
the
shallow
alluvial
a
q
~e
r
.
PCE
was
detected
in
two
of
the
three
wells
at
concentrations
of
79
ugL
and
105
uglL
(Ref
6,
p.
3
j.
The,
NMED
provided
emergency
funding
to
connect
these
residences
to
the
City
of
Roswell
systemwhichreceives
its
water
fromadeepercarbonate­
rock(
artesian)
aquifer(
Ref
7,
p.
1;
Ref
8,
p.
1).
.,

Target
wells
identified
forthis
site
consist
of
municipal
supply
wells
aqd
domestic
wells
that
lie
within
the
Target
Distance
Limit
(TDL)
of
a
&mile
radius
from
the
estimated
center
ofthe
plume.
Target
wells
identified
within
the
TDL
have
been
presented
in
the
table
below.
,Well
locations
yithin
each
distance
radii
are
.depicted
on
Figure
A­
3
of
Attachment
A
(Ref
21,
pp.
1­
6):
'It
should
be
noted
that
the
approximate
boundary
of
the
estimated
extent
ofthe
ground
water
plume
was
defined
based
on
ground
water
samples
meeting
observed
release
criteria.
,.

HRS
Documentation
Record
05/
30101
50
McGaffey
and
Main
Groundwater
Plume
NM0000605386
GW
~

Targets
The
distances
from
the
source
were
measured
from
the
former
dry
cleaning
facility
as
it
is
considered
to
be
a
potential
source
of
the
ground
water
plume.

TARGET
WELLS
3.3.1
Nearest
Well
According
to
the
HRS
Rule,
if
one
or
more
drinking
water
wellsis
subject
to
Level
I
concentrations,
a
value
of
50
is
assigned
as
the
Nearest
Well
Factor
Value
(Ref
1,
Sec.
3.3.1).
As
such,
the
two
private
domestic
wells
are
subject
to
Level
I
concentrations
and
were
being
used
as
the
sole
source
of
drinking
water
for
the
residences
at
the
time
the
PCE
was
detected
(Ref
4,
p.
5).
These
wells
are
located
within
a
2­
mile
radius
of
the
former
dry
cleaning
facility
which
is
considered
to
be
the
source
of
the
PCE
contamination
(See
Figure
A­
3).
In
1995,
the
NMED
provided
emergency
h
d
m
g
to
connect
these
residences
to
the
City
of
Roswell
system
which
receives
its
water
fiom
a
deeper
carbonate­
rock
(artesian)
aquifer
(Ref.
4,
p.
5;
Ref.
8,
p.
1).
These
wells
remain
available
for
sampling,
but
are
no
longer
used
for
drinking
water
purposes.
As
such,
a
value
of
50
has
been
assigned
as
the
Nearest
$ell
Factor.

Nearest
Well
Factor:
50
3.3.2
Population
A
discussion
ofthe
population
served
by
drinking
water
wells
(i.
e.,
municipal
supply
wells
afid
private
domestic
wells)
located
within
the
established
TDL
is
presented
in
the
following
subsections.

HRS
Documentation
Record
05/
30/
01
51
McGaffey
and
Main
Groundwater
Plume
NM0000605386
GW
­
Targets
3.3.2.1
Level
of
Contamination
3.3.2.2
Level
I
Concentrations
Level
I
concentrations
are
established
m
samples
from
drinking
water
wells
in
which
the
concentration
of
a
hazardous
substance
that
meets
the
criteria
for
an
observed
release
is
at
or
above
its
drinking
water
benchmark
(Ref.
1,
Sec.
2.5).
Drinking
water
benchmarks,
as
set
forth
in
SCDM,
include
Maximum
C
o
n
d
t
Level
(MCL)
and/
or
screening
concentrations
for
cancer
risk
(Ref
2).

Level
I
concentrations
have
been
documented
in
two
private
domestic
wells
in
accordance
with
the
HRS
Rule
(Ref.
1,
Sec.
3.3.2.2).
During
the
NMED's
1995
investiiationofdomestic
wells
withinthe,
vicinityofthe
foker
dry
cleaning
facility,
three
residences
were
discovered
wliose
sole
source
of
drinking
water
was
provided
fi­
om
their
domestic
wells.
Concentmtions
of
PCE,
were
detected
in
two
of
the
three
domestic
wells
at
concentrations
of
79
ug/
L
and
105
ugL
which
exceeded
the
MCL
for
PCE
of
5
ugL
(Ref
6,
p.
3).
In
1995;
the
NMED
provided
emergency
funding
to
connect
thes&..
residences
tb
&,
City
of
Roswell
system
which
receives
its
water
from
a
deeper
carbonate­
rock
(artesian)
aquifer
(Ref.
8,
p.
1).
These
wells
remain
available
for
sampling,
but
arenolongerusedfordrinking
water
purposes(
Ref.
4,
p.
5).
I
,
I
8,
,,.
.
I
Since
these
domestic
wells
were
being
used.
a
s
.
drinking
water
wells
at
the
time
the
PCE
contamination
was
discovered,
they
will
be
considered
subject
t
i
­1
contamination
(Ref
8,
p.
1).

Level
I
concentmtions
documented
in
pundl
water
samples
collected
&om
the
private
domestic
wells
are
presented
in
the
following
table.
The
locations
of
the
private
2omestic
wells
are
depicted
on
Figure
A­
3
of
Attachment
A.
The
domestic
wells
are
located
within
a
2­
mile
radius
of
the
former
dry
cleaning
facility.

LEVEL
I
CONCENTRATIONS
I'
I
2305
S.
Cahood
Ref.
2;
Ref.
11,
pp.
11­
MCL
79
5
PCB
01/
30/
95
1706
S.
Atkinsod
IO
OR­
95­
0628
Ref.
2;
Ref.
11,
pp.
6­
MCL
5
105
PCE
01/
27/
95
Note:

*
Value
assigned
using
the
Superfund
Chemical
Data
Matrix
(Ref.
2).

According
to
the
2000
Census
Population,
there
are
approximately
2.66
persons
per
household
Cx
Chaves
County
@ef
23,
p.
2).
Thus,
2.66
will
be
assigned
as
the
approximate
number
ofpersons
served
by
each
well
(Ref.
1,
Sec.
3.3.2).

HRS
Documentation
Record
05130101
52
McGatTey
and
Main
Groundwater
Plume
NM0000605386
GW
­
Targets
According
to
the
HRS
Rule,
the
Level1
ConcentrationFactor
Value
is
calculated
by
i
d
e
n
m
g
the
wells
subject
to
Level
I
concentrations
and
summing
the
number
of
people
served
by
these
wells.
This
sum
is
then
multiplied
by
10
and
the
resulting
product
is
assigned
as
the
Level
I
Concentration
Factor
Value
(Ref
1,
Sec.
3.3.2.2).

'
LEVEL
I
POPULATION
2305
S.
Cahoon
Ref.
23,
p.
2
2.66
1106
S.
Atkinson
Ref.
23,
p.
2
2.66
Population
Served
by
Level
I
Wells:
2.66
x
2
=
5.32
Level
I
Concentration
Factor
Value:
5.32
x
10
=
53.2
3.3.2.3
Level
I1
Concentrations
Level
I1
concentrations
are
established
m
samples
from
drinking
water
wells
in
which
the
concentration
of
a
hazardous
substance
meets
the
criteria
for
an
observed
release,
but
is
less
than
its
drinking
water
benchmark
(Ref.
1
Sec.
2.5).
Drinking
water
benchads,
as
set
forthm
SCDM,
include
MCLs
and/
or
screening
concentrations
for
cancer
risk
(Ref.
2).

Level
I1
concentrations
have
been
documented
in
City
of
Roswell
municipal
supply
wells
SRW12,
SRWl3,
SRW15,
and
SRW16onseveraloccasions
maccordancewiththeHRS
Rule
(Ref.
I­,
Sec.
3.3.2.3;
Ref.
17,
pp.
1­
27).
Ground
water
samples
collected
as
part
of
routine
compliance
sampling
have
established
Level
11
concentrations
in
these
municipal
supply
wells.
The
highest
LevelII
concentration
documented
in
ground
water
samples
collected
fromthe
four
aforementioned
municipal
supply
wells
are
presented
m
the
following
table.
Well
locations
are
depicted
on
Figure
A­
3
of
Attachment
A.

HRS
Documentation
Record
05/
30/
01
53
McGaffey
and
Main
Groundwater
Rume
NM0000605386
GW
­
Targets
LEVEL
II
CONCENTRATIONS
..

*
Value
assigned
using
the
Superfund
Chemical
Data
Matrix
(Ref.
2)

Municipal
supply
wells
SRW12,
SRW13,
SRW1.5,
and
SRW16
are
active
wells
that
are
part
of
the
blended
system
providing
drinking
water
to
the
City
of
Roswell.
The
City
of
Roswell
municipal
supply
system
is
composed
of
20
municipal
supply
wells,
none
of
which
contribute
more
than
40
percent
of
the
overall
total
production
oithe
system
(Ref
21,
p.
1).
The
system
serves
approximately
17,500
connections;
or
a
population
of
approdatey
48,000
inckiduals
(Ref
21,
p.
'1).

Because
no
one
municipal
supply
well
contributes
more
than40
percent
ofthe
o
v
e
d
total
production
ofthe
City
ofRoswell
system
the
total
number
of
individuals
served
by
the
system
will
be
apportioned
equally
to
each
well
(Ref
1,
Sec.
3.3.2;
Ref
21,
p.
1).
Thus,
approximately
2,400
individuals
are
served
by
each
well
and
this
number
will
be
assigned
as
the
population
associated
with
mmkipal
supply
wells
SRW12,
SRW13,
SRWl5,
and
SRWl6
(Ref.
1,
Sec.
3.3.2;
Ref.
2
1
,
p.
l)."
'
..

48,000
individuald20
municipal
supply
wells
=
2,400
individuals
per
well
According
to
the
HRS
Rule,
the
Level11
ConcentrationFactor
Value
is
calculated
by
identdjmgthe
wells
subject
to
Level
II
concentrations
for
the
aquifer
being
evaluated
and
summirig
the
number
of
people
served
by
these
wells.
This
product
is
assigned
as
the
Level
I1
Concent&
on
Factor
Value
(Ref
1,
Sec.
3.3.2.2).

HRS
Documentation
Record
05/
30/
01
McGaffey
and
Main
Groundwater
Plume
NM0000605386
54
GW
­
Ground
Water
Migration
Score
for
an
Aquifer
GW
­
Ground
Water
Pathway
Score
LEVEL
I1
POPULATION
I
SRW16
I
2,400
Ref.
1,
Sec.
3.3.2.2;
Ref.
21,
p.
1
I
Population
Served
by
Level
11
Wells:
2,400
x
4
=
9,600
Level
11
Concentration
Factor
Value:
9,600
3.3.2.4
I
.
PotentialContamination
Even
tho@
the
potential
exists
for
the
remaining
City
of
Roswell
municipal
supply
wells
to
be
subject
to
cm*@
mination
by
PCE,
potential
contamination
will
not
be
evaluated
because
actual
contamination
has
already
been
documented
for
both
domestic
wells
and
municipal
supply
wells
for
the
McGaffey
and
Main
Groundwater
Plume
site.

3.3.3
Resources
Water
drawn
fhm
any
target
well
for
the
aquifer
being
evaluated
that
is
used
for
irrigation
of
commercial
food
crops
or
commercial
forage
crops
can
be
considered
a
resource
under
the
HRS
Rule
(Ref
1
,
Sec.
3.3.3).
The
City
of
Roswell
is
a
large
agriculture
area
(Ref
6,
p.
1).
In
1978,
approximately
95
percent
ofthe
ground
water
withdrawn
from
the
Roswell
basin
was
used
for
irrigation.
In
1985,
approximately
88
percent
of
the
ground
water
witldrawn
fiom
the
Roswell
basin
was
used
for
irrigation
(Ref.
19,
p.
1
6).
As
such,
a
Resources
Factor
Value
of
5
will
be
assigned
(Ref
1,
Sec.
3.3.3).
Resources
Factor
Value:
5
3.3.4
WellheadProtectionAreas
A
Wellhead
Protection
Area
(WHPA)
is
defined
as
the
area
designated
by
states
according
to
Section
1428
of
the
Safe
Drinking
Water
Act
(SDWA),
as
amended,
to
protect
wells
and
recharge
areas
that
supply
public
drinking
water
systems
(Ref.
24,
pp.
1­
2).

For
the
State
ofNew
Mexico,
a
radius
of
1,000
feet
has
been
designated
as
a
WHPA
around
all
municipal
supply
wells
(Ref
24,
pp
.
1
­2).
Four
municipal
supply
ells
displaying
Level
11
concentrations
are
located
within
a
4­
mile
radius
of
the
approximate
extent
of
the
ground
water
plume.
Since
obsemed
ground
water
contamination
attributable
to
sources
at
the
site
lies
partially
or
M
y
within
the
designated
Wellhead
Protection
Area,
a
Wellhead
Protection
Factor
Value
of
20
will
be
assigned
(Ref,
1,
Sec.
3.3.4).

HRS
Documentation
Record
05/
30/
01
55
Wellhead
Protection
Area
Factor
Value:
20
McGafSey
and
Main
Groundwater
Plume
NM0000605386
GW
­
Ground
Water
Migration
Score
for
an
Aquifer
GW
­
Ground
Water
Pathway
Score
3.4
GROUNDWATER
MIGRATION
SCORE
FOR
AN
AQUIFER
The
carbonate­
rock
(artesian)
aquifer
and
the
hydraulically
connected
aquifer
m
the
alluvium
form
the
Roswell
Basin
Aquifer
system,
which
is
the
quifa
being
evaluated
for
this
site
(Ref.
19,
p.
10).
The
ground
water
migration
score
for
the
q&
er,
being
evaluated
was
calculated
as
follows:

Score
=
LikelihoodofRelease
x
WasteCharacteristics
x
Targets/
82,500
­
­
550
x
10
x
9678,2/
82,500
­
­
645.21
According
to
the
HRS
Rule,
the
ground
water
migration
score
for
an
aquifer
is
subject
to
a
maximumvalue
of
100
(Ref
1,
Sec.
3.4).
As
such,
a
value
of
100
will
de
&signed
as
the
gound
water
migration
score
for
an
aquifer.

Graund
'Mj'ater
Migration
Score
for
an
Aquifer:
100
3.5
&

A
value
of
100
is
assigned
as
the
ground
water
migration
pathway
score
since
only
one
aquifer
was
evaluated
for
the
site
(Ref.
1,
Sec.
3.5).

Ground
Water
Migration
Pathway
Score:
100
HRS
Documentation
Record
05/
30/
01
McGatTey
and
Main
Groundwater
Plume
NM0000605386
Surface
Water
­
Not
Scored
4.0
SURFACEWATERMIGRATIONPATHWAYSCORE
­
NOT
SCORED
The
surface
water
migration
pathway
will
not
be
scored
because
it
is
not
expected
to
contribute
sigmficantly
to
the
overall
site
score.
Further,
the
site
score
exceeds
28.5
based
only
on
evalution
of
the
ground
water
pathway.

HRS
Documentation
Record
05/
30/
01
57
McGaEey
and
Main
Groundwater
Plume
NM0000605386
5.0
SOIL
EXPOSURE
­
NOT
SCORED
Soil
Exposure
­
Not
Scored
Soil
exposure
will
not
be
scored
because
it
is
not
expected
to
contribute
sigmficantly
to
the
overall
site
score.
Further,
the
site
score
exceeds
28.5
based
only
on
the
evaluation
of
the
ground
water
pathway.

HRS
Documentation
Record
05/
30/
0
1
58
j
McGaffey
and
Main
Groundwater
Plume
NM0000605386
Air
Pathway
­
Not
Scored
6.0
AIR
MIGRATIONPATHWAY
­
NOT
SCORED
HRS
Documentation
Record
05/
30/
01
59
McGaffey
and
Main
Groundwater
Plume
NM0000605386
t
N
I
Reed
Street
T
I
:
Former
Dry
Cleaners
(D
+
TH­
7A
+
TH­
8A
ED95­
5
*
+
ED95­
8
ED95­
13
+

D95­
4
095­
3
095­
2
McGaffey
Street
ED95
­
7
LEGEND
i
Shallow
Well
*
tntermediate
Well
+­
DeepWell
e"
'
Vapor
Well
@
900
Fort
Street
Moll
Suite
810
Honolulu,
Howoii
96813
(808)
585­
0448
'
IO0
feet
I
MONITORINGWELLLOCATIONMAP
FIGURE
Roswell
'
Chaves
Countv.
NewMexico
I
A­
2
I
I
­

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