DSHW-2018-000289 - 0901a068807a1a35

Div of Waste Management
and Radiation Control
JAN U 2018
January 10, 2018
8200-FY18-001
Orbital ATK/J
DSHK/-20I6- 000281
Mr. Scott T. Anderson, Director
Utah Department of Environmental Quality
Division of Waste Management and Radiation Control
195 North 1950 West
P.O. Box 144880
Salt Lake City, Utah 84114-4880
Re: ATK Launch Systems Inc., Proposed Groundwater Exposure Units, Promontory
EPA ID #UTD009081357
Dear Mr. Anderson:
ATK Launch Systems Promontory (ATK) is in the process of revising a draft human
health and ecological risk assessment for groundwater at the facility. The groundwater
exposure units associated with these risk assessments are also being revised. The attached
report describes the latest proposed exposure units as determined through discussions
with Jeff Vandel and Eric Baden of your office. ATK requests your approval of these
proposed exposure units which will allow us to continue moving forward with the risk
assessments.
If you have questions regarding this report, please contact Paul Hancock at (435) 863-
3344.
§]nr»iar<=0'\/
Kris H. Blauer
Manager, Environmental Services
ATK Launch Systems, Inc.
Orbital ATK, Inc.P.O. Box 707, Brigham City, Utah 84302 • 435-863-3511
Geosyntec^1376 Miner’s Drive Suite 108
Lafayette, Colorado 80026
PH 303 243.5582
www.geosyntec comconsultants
Memorandum
Date: January 5,2018
To: Paul Hancock, OrbitalATK
From: Anne Woodland, Emily Larson and Stephen Foster
Geosyntec Consultants
Subject: Groundwater Plumes Discussion Topics - Promontory Human Health
Risk Assessment
To:
BACKGROUND
Groundwater at the OrbitalATK (ATK) Promontory Facility (Promontory) has been monitored for
many years and found to contain volatile organic compound (VOC) and ammonium perchlorate
(perchlorate) contamination in what has been preliminarily identified as eight locations (plumes).
These are shown on Figure 1. This figure was developed as a working model by the Utah Division
of Waste Management and Radiation Control (DWMRC) and ATK. The plumes can be generally
identified as stemming from: a) the northern manufacturing area, b) the M-136 burning grounds,
which incorporates the central manufacturing area, c) an upper perched groundwater aquifer east
of these locations, d) a plume downgradient of these sources that extends into the alluvium to the
property boundary on the south east, and e) a perched groundwater system that feeds into this
alluvium and spring-fed ponds south of the ATK property boundary.
OBJECTIVES:
The purpose of this memorandum is to summarize and identify the critical issues for groundwater
contaminant plume delineation and well selection for the human health risk assessment (HHRA),
and potential subsequent groundwater remediation strategies. In addition, the goal is to delineate
the eight plumes at Promontory (Figure 1) by identifying the wells with volatile organic compound
(VOC) and perchlorate contamination that are likely to drive the risk assessment within each
plume. This memorandum identifies the wells that will be included in determining the exposure
point concentrations for the HHRA, and other outstanding issues.
Table 1 summarizes the groundwater wells, arranged by plume, and presents the maximum
detected perchlorate and trichloroethene (TCE) concentrations for each well from 2008 through
the spring of 2017. Table 1 also identifies the wells within each plume that have the highest
engineers I scientists I innovators
Groundwater Plume Delineation
OrbitalATK Promontory
Page 2
perchlorate and TCE concentrations (shown in orange shading). Those wells are assigned as the
maximum wells for each plume, to be used to estimate the worst-case scenario for the HHRA.
Table 2 summarizes only the maximum wells for each plume, for ease of reference.
Plume #1
J-l had a maximum perchlorate concentration of 1,350 ug/L in 2009, but concentrations decreased
to around 250 ug/L in 2016. LF-1 has the next highest perchlorate concentration in Plume 1, and
shows an increasing concentration since 2008. M-508-4 contains the maximum TCE concentration
and has Cr VI of around 100 ug/L (2016). Therefore LF-1 and M-508-4 will be considered as the
maximum wells for perchlorate and TCE respectively, representing the worst-case scenario wells
for Plume 1. There are about 12 other wells in Plume 1 that have sufficient data to include in a
95% Upper Confidence Level (UCL) mean calculation representing a Reasonable Maximum
Exposure (RME) scenario under the hypothetical situation of residential exposure, as shown in
Table 1. The 95%UCL calculation will also include the maximum wells.
TCC8 and TCC8A are proposed as potential boundary wells for Plume 1, and those data would
not be included in the 95% UCL calculation. Perchlorate is non-detect for those wells, while the
maximum TCE concentration at TCC8 is 25 ug/L in 2014. The recently sampled well LF-4, is on
the northwest side of Plume 1 and is considered a background well. The Fall 2017 sampling found
detected concentrations of Cr VI at 2.3 ug/L (J-flag) and total Chromium at 12,500 ug/L. It is likely
that the well construction material (stainless steel) is the maximum of Cr VI, due to the corrosion
over time. This issue was presented in an earlier version of the HHRA, showing that along with
chromium, molybdenum and cobalt concentrations indicative of stainless steel corrosion have been
found in groundwater samples at this site.
Plume #2
Four wells make up Plume 2, as shown in Table 1; P-2, P-6, P-7, and P-10. Well P-7 has the
maximum perchlorate concentration of 2,570 ug/L in 2008. This well shows decreasing
perchlorate concentrations since 2008, however the concentrations are still greater than 1,000 ug/L.
P-6 has the maximum TCE concentration of 4,410 ug/L in 2016. This well shows increasing TCE
concentrations over time. This area appears to be limited in extent of contamination, as P-2 and P-
10 have relatively low perchlorate and TCE concentrations compared to P-6 and P-7. Data from
all four wells will be included in the 95%UCL calculation for Plume 2. Three sampling events
have occurred at well P-2 since 2008; TCE has decreased from 20 ug/L in 2008 to non-detect (<
10 ug/L) in 2014, and a perchlorate concentration of 8 ug/L in 2014. Three sampling events have
occurred at P-10 since 2008, because the well went dry in 2012 and it has been difficult to obtain
regular samples. However, samples were obtained in June and October 2017.
Groundwater Plume Delineation
OrbitalATK Promontory
Page 3
Plume #3
Plume 3, the perched aquifer has been divided into two sub-plumes 3A and 3B, as shown on
Figure 1. The wells north of and including B-10 are in Plume 3A, and the wells south of B-10 are
in Plume 3B. Perchlorate concentrations are relatively consistent across the entire plume. The
maximum perchlorate concentration of 6,040 ug/L occurred at M39-B1 in 2015. This well shows
increasing perchlorate concentrations since 2008. Within Plume 3A, the hot spot for TCE occurs
around wells A-3, B-9 and D-l, the latter of which has the max TCE concentration of 21,800 ug/L
in 2015. This well shows increasing concentrations since 2008. Nearby wells A-2, A-10 and B-10
are orders of magnitude lower than D-l though, indicating that the hot spot is bounded by those
wells. TCE concentrations dissipate as you move south through Plume 3. While the perchlorate
concentrations are relatively consistent across Plume 3, the TCE hot spot is much smaller in the
area within Plume 3B.
Well J-4 is near well Ml 14-B1, however it was drilled much deeper and is in the regional aquifer
at approximately 320 feet (see cross-section at the end of this document). Therefore, well J-4 is
included in Plume 4.
In addition to the two maximum wells, there are 9 other wells in Plumes 3A and 3B with sufficient
data to include in separate 95%UCL calculations representing an RME scenario, as shown in Table
1.
In the fall of 2017, OrbitalATK sampled wells M-l 14 Bl, M-636 Bl, and M-39 Bl, running north
to south across Plumes 3A and 3B, for both total chromium and Cr VI. These wells were sampled
to help characterize the area as they may have been affected by historical disposal of photographic
waste and could be a source of Cr VI in groundwater. All three wells had non-detected levels of
Cr and Cr VI. Previously, these wells had Cr detections ranging from 15 ug/L (M-636B1) to 26
ug/L (M-114B1).
Plume #4
The maximum perchlorate concentration in Plume 4 is located at the north end of the plume and
occurred in 2014 at well D-5 (247,000 ug/L). Perchlorate is consistently detected across Plume 4,
but decreases to around 100 ug/L towards the south end of the plume. It is likely that the Ml36
burning grounds are the origin of the perchlorate at the north end of this plume, and that the
concentrations are decreasing with distance from the source. The TCE maximum is also at the
north end of the plume, with the max concentration of 6,760 ug/L occurring in 2013 at well A-8.
All TCE concentrations in A-8 since 2008 have been greater than 3,000 ug/L. The TCE
concentrations decrease moving toward the south end of Plume 4, but generally are greater than
Groundwater Plume Delineation
OrbitalATK Promontory
Page 4
1,000 ug/L. Plume 4 has one detection of Cr VI at E-5 with the maximum concentration measured
in the Fall 2017 sampling at 34 ug/L. Previously, the maximum concentration at this location was
11 ug/L in 2010.
There are about 47 other wells with sufficient data to include in the 95%UCL calculations. Wells
H-l, H-2, H-3, H-7, H-8, H-9, BC-4, BC-6 and G-3 are outside Plume 4 along the westem/southem
edge and have mostly non-detects for perchlorate and TCE; they are considered boundary wells.
These nine wells will not be included in the 95%UCL calculations since they are considered
background/boundary wells. Well H-5 is outside the line for Plume 4, but has perchlorate
maximum of 350 ug/L, and will therefore be included in the 95%UCL calculations. Well J-9 is
east of Plume 4 and is considered a potential background well because it is mostly non-detect for
perchlorate and TCE.
Plume #5
Shotgun springs will be evaluated separately from the other springs. Perchlorate concentrations
have increased over time, with a maximum of 430 ug/L in 2017. Shotgun springs has a maximum
TCE concentration of 25 ug/L in 2016, and concentrations have decreased since then.
Plume #6
Pipe springs will also be evaluated separately from the other springs. Perchlorate in Pipe springs
shows an increasing trend since 2008, with a maximum concentration of 694 ug/L in 2015 and
then decreasing somewhat since then. TCE concentrations have ranged from approximately 5-10
ug/L over the last several years.
Plume #7
This plume consists of wells G-6, G-7 and G-8. The perchlorate maximum occurs at well G-6,
with a concentration of 405 ug/L occurring in 2014. The other wells in Plume 7 have perchlorate
concentrations that are less than 50 ug/L. The TCE maximum also occurs at well G-6, with a
concentration of 9.9 ug/L occurring in 2011, and decreasing to 5.4 ug/L in 2014. The other wells
have non-detect TCE concentrations.
Plume #8
Both the perchlorate and TCE maximum concentrations occur at well X-4 in 2016. Perchlorate
concentrations in X-4 have increased since 2008 to a maximum concentration of 523 ug/L in 2016.
TCE concentrations in X-4 have also increased since 2008 to a maximum concentration of 147
ug/L in 2016. Well X-5 is a potential boundary well for Plume 8, based on its locations and mostly
non-detect results for perchlorate and TCE. There are two other wells in Plume 8 with sufficient
Groundwater Plume Delineation
OrbitalATK Promontory
Page 5
data to include in the 95%UCL calculation. Well TCC3A has been sampled twice per year since
roughly 2009.
Plume #9
Plume 9 consists of the Fish and Horse springs and well H-10. Perchlorate concentrations are very
low with a historic maximum of 6 ug/L at Horse springs, 5 ug/L at Fish springs and TCE is mostly
non-detect in both springs.
Table 1 Summary of Groundwater Wells and Plume Designations for Promontory HHRA
Plume Name Well
Maximum
Perchlorate
Concentration
(ug/L)
Max
Perchlorate
Date
Maximum TCE
Concentration
(ug/L)
Max TCE
Date Data Availability
Source wells -
worst case
scenario
Concentration Data Include in
95UCL Notes Changes in Plume
Assignments
0 BKGD LF-4 <40 10/11/02017 48 10/11/02017 No
1 M508 C-6 42 10/3/2017 28 10/3/2017 No
1 M508 C-8 9 12/9/2014 0 All ND TCE data No outside plume line,
downgradient of plume 1
1 M508 J-l 1350 9/24/2009 551 10/18/2011 decreasing since 2009 Yes
1 M508 J-7 742 12/5/2014 55 5 11/19/2013 Yes
1 M508 J-8 <4 All ND data Non-dciccts (Perchlorate < 4 ug/L. TCE
< 10 ug/L)Yes
1 M508 LK-!1 170 10/13/2016 49 6 10/13/2016 Perchlorate increasing Perchlorate concentrations
since 2008. TCE stable around 50 ug/L Yes
1 M508 LF-2 <40 0 All ND data Yes
[M50K LF-3 <4 0 All ND data Yes
1 M508 M508-1 9 10/1 1/2016 153 10/11/2016 Yes
1 M508 M508-2 19 6/14/2016 652 10/11/2016 Yes
1 M508 M508-3 184 6/14/2016 5810 9/23/2009 Yes
1 M508 M508-4 138 10/11/2016 9820 10/11/2016 TCE Perchtoraic < 1400 ug/L. TCE = 427 -
9820 ug/L Yes
1 M508 M508-B1 44 10/11/2016 781 9/29/2008 Yes
1 M508 P-1 <40 5 9 6/25/2011 Yes
1 M508 P-3 No Data (2004-2017)No outside plume line,
upgradicnt sentinel well
1 M508 P-5 No Data (2004-2017)No
1 M508 P-8 8 6/25/2011 863 9/29/2008 Yes
1 M508 P-9 <40 265 9/29/2008 Yes
1 M508 TCC8 <20 25 2 12/4/2014 No outside plume line,
potential boundary well
1 M508 TCC8A <40 2 6/25/2013 No outside plume line,
potential boundary well
2 M585 P-2 8 11/20/2014 20 5 9/25/2008 3 sampling events Yes
2 M585 P-6 <40 4410 10/14/2016 TCE all TCE > 1,000 ug/L Yes
2 M585 P-7 2570 9/25/2008 418 10/18/201 l Perchlorate Perchlorate decreasing over time, but all
samples > 1000 ug/L Yes
2 M585 P-10 7 6/1/2017 315 10/9/2017 3 sampling events Yes
3A Perched Aquifer A-10 19 5/23/2017 I 3 10/6/2008 Yes
3 A Perched Aquifer A-2 41 12/9/2014 1 1 7 12/9/2014 Yes
3 A Perched Aquifer A-3 1740 7/8/2016 7520 6/20/2013 Yes
3A Perched Aquifer B-lf)4170 6/20/2013 40 2 6/3/2010 Yes
3 A Perched Aquifer B-9 65 7/8/2016 6920 7/8/2016 Yes
3A Perched Aquifer C-4 No Data (2004-2017)No
3A Perched Aquifer D-l 1200 10/25/2011 21800 6/28/2015 TCE All TCE >5000 ug/L Yes
3A Perched Aquifer M636-BI 55 2 9/25/2009 0 All ND TCE data Yes
3B Perched Aquifer J-2 543 4/27/2009 2 5/22/2012 Yes
3B Perched Aquifer J-3 6 5/15/2014 2 7 10/16/2008 Yes
3B Perched Aquifer Ml 14-BI 44 5 10/16/2008 2 2 10/16/2008 Yes
3B Perched Aquifer M39-BI 6040 6/28/2015 25 4 1 1/1/2011 Perchlorate All Perchlorate samples >2500 ug/L Yes
4 Lampo Junction BC-4 No Daia (2004-2017)No outside plume line,
potential boundary well
Page 1
Table 1 Summary of Groundwater Wells and Plume Designations for Promontory HHRA
Plume Name Well
Maximum
Perchlorate
Concentration
(ug/L)
Max
Perchlorate
Date
Maximum TCE
Concentration
(ug/L)
Max TCE
Date Data Availability
Source wells -
worst case
scenario
Concentration Data Include in
9SUCL Notes Changes in Plume
4 Lampo Junction BC-6 No Data (2004-2017)No outside plume line,
potential boundary well
4 Lampo Junction G-3 <40 All ND data No potential bounday well
4 Lampo Junction G-4 1 18 10/19/2016 57 5 11/1/2011 Yes
4 Lampo Junction G-5 7 1 1/20/2014 71 6 10/20/201 1 TCE All TCE <80 ur/L Yes
4 Lampo Junction H-9 <40 All ND Data No outside plume line,
potential boundary well
4 Lampo Junction J-5 24 6/7/2012 7 6 6/25/2013 Yes
4 Lampo Junction J-6 17 6/7/2012 95 6/7/2012 Yes
4 Ml 36 A-1 <4 132 6/27/2013 All ND pcrc data Yes
4 M 136 A-4 one perc result in 2004 No data 2008-2017 No
4 Ml 36 A-5 9360 6/28/2011 2680 10/30/2012 Yes
4 Ml 36 A-6 23200 10/8/2008 73 2 10/8/2008 Yes
4 Ml 36 A-7 <40 26 5/30/2012 All ND pcrc data Yes
4 M 136 A-K 8520 6/4/2010 6760 6/20/2013 TCE All TCE >3000 ur/L Yes
4 Ml 36 A-9 2120 11/3/2008 75 3 1 1/3/2008 Yes
4 Ml 36 B-l 2000 10/2/2008 1220 10/2/2008 Yes
4 Ml 36 B-2 25600 6/3/2010 3390 6/14/2016 Yes
4 MI36 B-3 43400 10/10/2008 4080 12/5/2014 Yes
4 Ml 36 B-4 63900 5/15/2017 1300 10/18/2011 Yes
4 Ml 36 B-5 344 10/27/201 1 726 10/27/201 1 Yes
4 Ml 36 B-6 45500 10/17/2008 2220 6/3/2010 Yes
4 M 136 B-7 806 6/9/2016 424 5/13/2014 Yes
4 Ml 36 B-8 766 10/17/2008 22 7 10/17/2008 Yes
4 M 136 BC-3 10 6/30/2015 0 All ND TCE data No outside plume line
4 Ml 36 C-l 26300 6/28/201 1 1270 10/30/2012 Yes
4 Ml 36 C -2 1 19 10/14/2016 1390 6/7/2012 Yes
4 Ml 36 C-3 38600 7/8/2016 5470 6/16/2009 Y'es
4 Ml 36 C-5 32400 10/2/2008 2010 10/2/2008 Yes
4 Ml 36 C-7 108 1 1/17/2008 0 All ND TCE data Yes
4 Ml 36 D-2 731 6/28/201 1 1840 6/16/2009 Yes
4 Ml 36 D-3 6 98 10/8/2008 107 10/1 3/2016 Yes
4 Ml 36 D-4 1 71000 10/13/2016 55 6 12/1/2010 Yes
4 M 136 D 5 247000 5/13/2014 800 10/30/2012 Perchlorate All Perchlorate samples >150,000 ug/L Yes
4 Ml 36 D-6 213000 5/31/2017 1090 5/14/2009 Yes
4 MI36 E-l 46700 10/10/2008 1850 10/10/2008 Yes
4 Ml 36 E-IO 22100 1 1/19/2013 2230 12/5/2014 Yes
4 M 136 L-2 20 1 1/4/2015 2 3 12/1/2010 Yes
4 Ml 36 E-3 93 8 5/8/2009 70 3 5/8/2009 Yes
4 Ml 36 E-4 237 10/16/2008 147 5/8/2009 Yes
4 Ml 36 E-3 106 10/19/2016 62 2 11/21/2013 Yes
4 M 136 E-6 60 7 5/8/2009 50 5 5/8/2009 Yes
4 Ml 36 E-7 No Data (2004-2017) No
4 M 136 E-8 94 6/13/2013 179 6/13/2013 Yes
4 Ml 36 E-9 2390 10/15/2008 2830 10/27/2011 Yes
4 Ml 36 EW-6 12000 5/22/2014 597 5/22/2014 Yes
4 M 136 F-l 48600 12/5/2014 2740 12/5/2014 3 data points (TCE)All TCE < 3000 ug/L Yes
4 Ml 36 F-2 <40 1 result (2014) all ND perc and
TCE Yes
4 M 136 F-3 3690 10/17/2008 143 10/17/2008 Yes
4 Ml 36 F-4 184 12/13/2010 19 1 12/13/2010 Yes
4 MI36 F-5 No Data (2004-2014)
4 Ml 36 G-l 294 6/5/2015 9 7 10/17/2008 Yes
4 M 136 G-2 52100 6/3/2010 2610 5/30/2012 All Perchlorate sample* > 40.000 ug/L Yes
Page 2
Table 1 Summary of Groundwater Wells and Plume Designations for Promontory HHRA
Plume Name Well
Maximum
Perchlorate
Concentration
(ur/L)
Max
Perchlorate
Date
Maximum ICE
Concentration
(ug/L)
Max TCE
Date Data Availability
Source wells ■
worst case
scenario
Concentration Data Include in
95UCL Notes Changes in Plume
Assignments
4 Ml 36 H-l 30 6/28/2015 7 7 6/28/2015 1 detected TCE and Perchlorate
sample No outside plume 4.
potential boundary well
4 Ml 36 H-2 13 2 5/27/2009 37 6/28/2015 1 detected TCE sample. 2
detected Perchlorate sample No outside plume 4.
potential boundary well
4 MI36 H-3 <40 All ND Data (2008 - 2017)No outside plume 4.
potential boundary well
4 MI36 H-4 144 6/30/2015 5 9 6/25/201 1 Yes
4 MI36 H-5 350 12/8/2015 9 4 10/28/2015 2 detected TCE samples. 4
detected C104 Yes
4 Ml 36 H-6 38 6/25/2015 45 11/8/2011 Yes
4 M 136 H-7 7 6/25/2015 0 All ND TCE data, 1 delected
sample No outside plume 4.
potential boundary well
4 M136 H-8 <40 0 All ND data No outside plume line,
potential boundary- well
4 Ml 36 J-4 36 8 10/16/2008 4290 10/8/2009 Yes
4 M 136 J-9 <4 8 7 4/30/2009 1 detected TCE result No outside plume 4.
potential boundary well
4 Ml 36 TCC2 no data from 2004-2017, on map near J-3
(plume 3)
4 Ml 36 TCC4 no data No
5 Shotgun Spring Shotgun 302 6/5/2015 25 2 6/9/2016 TCE ranges from 3 - 26 ug/L NA
6 Pipe Spring Pipe 694 6/5/2015 98 6/5/2015 NA
7 Lampo Junction G-6 405 1 1/20/2014 99 6/25/2011 TCE and
Perchlorate Yes
7 Lampo Junction G-7 <40 All ND data No outside plume 7,
potential boundary well
7 Lampo Junction G-8 44 6/25/2015 0 All ND TCE data Yes
8 M225 TCC3 83 10/27/2011 32 6 10/27/2011 4 sampling events Yes
8 M225 TCC3A 118 9/30/2013 33 4 9/30/2013 sampled twice per year (2009-2017)Yes
8 M225 X-4 523 7/8/2016 147 7/8/2016 Perchlorate and
TCE
All TCE < 150 ug/L. All Perchlorate
samples <550 ug/L • 3 sampling events Yes
8 M225 X-5 <40 1 9 6/28/201 1 1 detected TCE sample No outside plume 8.
potential boundary well
9 SPRINGS Fish 5 11/20/2014 0 All ND TCE data Yes
9 SPRINGS H-10 <40 0 All ND data The ND perchlorate result of <40 ug/L is
the most recent result from H-10 No
9 SPRINGS Horse 6 11/20/2014 3 3 10/26/2009 Yes
0 = all non-detect results_____________________________________________________________________________________
(shading indicates a well that has the maximum perchlorate and/or tnchloroethene concentration in that plumT
Page 3
Table 2. Summary of Groundwater Wells with the Highest Perchlorate and Trichloroethene Concentrations Within Each Plume
Plume Name Well
Maximum
Perchlorate
Concentration
(ug/L)
Max
Perchlorate
Date
Maximum TCE
Concentration
(ug/L)
Max TCE
Date
1 M508 LF-I 1170 10/13/2016 49.6 10/13/2016
1 M508 M508-4 138 10/11/2016 9820 10/1 1/2016
2 M585 P-6 <40 NA 4410 10/14/2016
2 M585 P-7 2570 9/25/2008 418 10/18/2011
3A Perched Aquifer D-l 1200 10/25/201 1 21800 6/28/2015
3B Perched Aquifer M39-BI 6040 6/28/2015 25.4 11/1/2011
4 M136 A-8 8520 6/4/2010 6760 6/20/2013
4 M136 D-5 247000 5/13/2014 800 10/30/2012
5 Shotgun Spring Shotgun Spring 302 6/5/2015 25.2 6/9/2016
6 Pipe Spring Pipe Spring 694 6/5/2015 9.8 6/5/2015
7 Lampo Junction G-6 405 11/20/2014 9.9 6/25/2011
8 M225 X-4 523 7/8/2016 147 7/8/2016
9 Other Springs Horse 6 11/20/2014 3.3 10/26/2009
ATK FACILITY BOUNDARY
E519 LABORATORY SUMP
E585 LABORATORY SUMP
AREA
M153
M136 BURNING GROUNDS
PLANT 3
BUILDING 115 WASHOUT
(PERCHLORATE AND TCE)
(PERCHLORATE AND TCE)
(PERCHLORATE)
(PERCHLORATE, TCE AND TCA)
(TCE)
(CLO4 AND TCE)
DRUM STORAGE AREA
DRAINFIELD
PERCHED AQUIFER
(PERCHLORATE, TCE AND TCA)
(TCE)
PIPE SPRING
FISH SPRING
HORSE SPRING B HORSE
H-7
H-6
H-3
H-2
H-1
H-9
EW-1
BC-5
TCC7 (ABANDONED)
EW-3
BC-3
EW-2
BC-6
BC-4
E-6
TCC6
TCC5
G-7
G-6
G-5G-4
G-3
P-3
P-8P-5
P-4 (ABANDONED)
LF-4
C-6C-8
F-4
E-9
E-8
C-7
B-4
B-3
E-5
E-4
J-6J-5
H-10
J-9
G-8
LF-2
J-1
M508-B1
M508-4M508-3
M508-2M508-1
P-2
P-1
P-9
P-7
P-6
TCC8A
TCC8
LF-3
LF-1
J-7
J-8
H-8
G-1
TCC1B-8
F-5
F-3 F-2
F-1
T-1 B-6E-7
E-1
B-5
H-5
BC-2
M636-B1
P-10
A-9
C-5 B-2
D-3
TCC4
A-6 C-2
D-5
D-4
A-7
A-8
C-1
1
2
4
5 6
7
SHOTGUN SPRING
4
J-4
A-10
E-10
M39-B1
J-2
M114-B1
TCC2
J-3
D-6
T-2
B-1
B-10
A-2A-3
B-9
C-4
A-1
A-4D-2 D-1
A-5
C-3
3B
3B
H-4
E-3EW-6
G-2
B-7
3A
SPRING A
TCC3
X-5
TCC3A
X-4
8
9
5