Technical Memo: Draft soil gas sampling results, 8/12 ...
Transcript of Technical Memo: Draft soil gas sampling results, 8/12 ...
Technical Memorandum
ITSIGilbaneCompany|2730ShadelandsDrive|WalnutCreek,CA94598|Tel:925‐946‐3100|Fax:925‐256‐8998www.itsigilbane.com
This technical memorandum documents the results of additional soil gas monitoring for evaluation of potential vapor intrusion in the San Gabriel Valley Area 1 Superfund Site, South El Monte Operable Unit, San Gabriel Basin, Los Angeles County, California.
The initial soil gas sampling event was completed in August 2011, in accordance with the Final Sampling and Analysis Plan, Supplemental Remedial Investigation/Feasibility Study, San Gabriel Valley Area 1 Superfund Site, South El Monte Operable Unit, San Gabriel Basin (SAP; Innovative Technical Solutions, Inc. [ITSI], March 2011a). Soil gas sampling results from the August 2011 sampling event presented in the South El Monte Operable Unit Supplemental Remedial Investigation/Feasibility Study, Soil Vapor Monitoring Results Technical Memorandum (ITSI, 2011) showed levels of volatile organic compounds (VOCs) well above the vapor intrusion screening levels; therefore additional sampling was performed in August 2012 throughout the SEMOU as specified in the Second Modification to the SAP (ITSI, 2012).
Background
The initial (August 2011c) soil vapor sampling locations were based on preliminary vapor intrusion evaluation results presented in Tables 3 and 5 of the Initial Evaluation of Potential Vapor Intrusion Associated with VOC Contamination in the South El Monte OU, San Gabriel Valley Superfund Site (2009 VI tech memo; CH2M Hill, 2009). Table 3 summarized cumulative risks and hazards associated with historic soil gas sampling results at 26 facilities. Table 5 summarized groundwater screening results and was used to prioritize residential areas for additional investigation of potential vapor intrusion from the downgradient groundwater plume.
Table 4-3 of the SAP (Locations and Rationale for Soil Gas Sampling) includes the specific rationale for soil gas sampling at 6 facilities and 4 downgradient plume locations considered to be high priority for an initial investigation of the potential for vapor intrusion. Additional rationale for soil gas sampling at the high priority locations was presented in Technical Memorandum, Soil Vapor Monitoring-Supplemental RI/FS, South El Monte OU-Additional Rationale for Monitoring Locations (ITSI, 2011b). The August 2011 soil vapor sampling was conducted at 5 of the facilities and 3 of the downgradient plume areas of the high priority locations. Access to the sixth facility (Phillips and Malone) was not obtained for the August 2011 sampling event. Further review of the groundwater plume concentrations indicated that the fourth groundwater plume location (CPR Industries) did not justify soil gas sampling because groundwater concentrations were less than Maximum Contaminant Levels (MCLs). In addition, CPR Industries was listed as a low priority site in Table 3 from the 2009 VI Tech Memo.
To: Rachelle Thompson, US EPA, Region 9
From: Don Gruber, Senior Hydrogeologist, ITSI Gilbane Company
Date: October 18, 2012
Subject: Draft Soil Gas Sampling Results August 2012, Supplemental Remedial Investigation/Feasibility Study, San Gabriel Valley Area 1 Superfund Site, South El Monte Operable Unit
Contract /TO: EP-S9-08-03/TO 47 ITSI DCN: 07136.0048.0040
SDMS DOCID# 1138189
Technical Memorandum (Continued)
Draft Soil Gas Sampling Results August 2012, Supplemental Remedial Investigation/Feasibility Study, San Gabriel Valley Area 1 Superfund Site, South El Monte Operable Unit
Draft Draft Soil Gas Sampling Results August 2012.docx Page 2 of 11
The August 2012 soil gas sampling event targeted the remaining 20 facilities listed in Table 3 in the 2009 VI tech memo and 2 additional locations based on review of existing background data. The sampling rationale was based on information presented in the 2009 VI tech memo and a review of background data for these facilities included in the Los Angeles Regional Water Quality Control Board background data files and the EPA Records Center. Fifteen of the 22 facilities were sampled in August 2012. The 7 remaining facilities were not sampled because access could not be obtained. Figure1 presents the facility locations for the August 2011 and August 2012 sampling events and the 7 locations that were not sampled.
Soil Gas Sampling Methods and QA/QC Procedures
Field activities for soil vapor monitoring were conducted from August 7 through 20, 2012. A total of 86 soil gas samples was collected from 42 temporary soil vapor monitoring wells at the 15 potential responsible party (PRP) facilities. As shown on Figure 1, the sampling locations are identified by their potential responsible party (PRP) facility name (i.e., Astro Seal, Inc.).
The direct-push drilling method was used to advance the temporary soil vapor monitoring well boreholes. Each well was drilled to 15.5 feet below ground surface (bgs) and completed with two separate well screens (4.5 to 5.5 and 15.0 to 15.5 feet bgs). Teflon tubing, extending from ground surface, was attached to each well screen and coarse-graded silica sand was used as a filter medium around each screen. The area between the screens and from the shallow screen to the ground surface was sealed with sodium bentonite, hydrated in place, to form individual sampling intervals. Practices presented in the SAP (ITSI Standard Operating Procedure for Soil Gas Sampling-Subsurface) were used to collect soil gas samples. The only deviation from the cited ITSI standard operating procedure (SOP) was the use of 1,1-difluoroethane rather than helium for leak detection. In addition, a purge volume test was performed following procedures documented in the California Environmental Protection Agency, Department of Toxic Substances Control, Advisory Active Soil Gas Investigation (April 2012). As specified in this advisory, purge volumes of one, three, and ten volumes were collected and analyzed for the first 5- and 15-foot soil gas samples collected from temporary soil vapor monitoring well SEMSG16-B1 (see Table 1).
Based on analytical results (e.g. highest concentrations) from the purge volume test, three purge volumes of soil gas were used for the five-foot wells and 10 purge volumes were used for the 15-foot wells. In accordance with the Second Modification to the SAP (ITSI, 2012), an on-site mobile laboratory (H&P Mobile Geochemistry, Inc. [H&P]) was used for sample analysis during this sampling event to evaluate soil gas concentrations in a “real-time” scenario. The vapor wells were purged and sampled by the mobile lab operator under supervision of ITSI personnel. The samples were collected using a glass syringe and analyzed for volatile organic compounds (VOCs) by EPA Method TO-15. Upon completion of soil gas sampling activities, all well construction materials were removed from each borehole. The boreholes were backfilled from total depth to 0.5 foot bgs with bentonite grout, and the remaining portion of each borehole was filled with material appropriate to match pre-existing conditions (asphalt or concrete). All used well construction and sampling materials were disposed of as non-hazardous waste.
Technical Memorandum (Continued)
Draft Soil Gas Sampling Results August 2012, Supplemental Remedial Investigation/Feasibility Study, San Gabriel Valley Area 1 Superfund Site, South El Monte Operable Unit
Draft Draft Soil Gas Sampling Results August 2012.docx Page 3 of 11
Use of the on-site mobile laboratory required a modification to the data validation procedures for soil gas as presented in the SAP. Based on discussion between H&P, the EPA Quality Assurance Office, and ITSI, it was determined that 90% of the analytical data produced during this sampling event would receive Tier 1 (summary data review) data validation and 10% of the analytical data would receive Tier 3 (full in-depth data review) data validation.
A review of performance documentation provided by H&P indicated that recent Rapid Return Performance Test (PT) results were slightly elevated. To address this concern, analysis and validation of the first set of samples collected during the sampling event was expedited. ITSI completed Tier 3 data validation on the first set of samples to ensure that all the mobile laboratory QA/QC results were within their respective acceptance limits. Additionally, H&P was requested to report their ongoing PT results to demonstrate the effectiveness of their internal corrective action program.
In addition to these modified quality assurance/quality control (QA/QC) measures, ITSI submitted split samples on 10% of the total sample group to the EPA Region 9 Laboratory for analysis and validation. The split soil-gas sample canisters were shipped via Federal Express under chain-of-custody documentation for VOC analysis by EPA Method TO-15.
The results for data validation performed by ITSI indicated there were no qualified data for the initial sampling event. A data quality assessment of the overall data QA/QC measures was prepared by the ITSI project chemist and data were determined to be acceptable for decision-making purposes. The chemist’s evaluation, including an evaluation of the split-sampling results, a recent PT Report, and the data validation report is included in Attachment 2.
Soil Gas Sampling Results
Table 1, South El Monte OU Soil Gas Monitoring Results, August 2012, presents the results for the analytes included in EPA Method TO-15. As shown in the table, the sampling locations are identified by their potential responsible party (PRP) facility name (e.g., Astro Seal, Inc.) and boring location ID. Concentrations of chemicals detected above their respective laboratory reporting limits are presented in bold-face type. Figures illustrating each sampling location are attached to this technical memorandum (Attachment 1). The figures include overview details of each location, PRP facility boundaries where appropriate, and soil gas sampling results for tetrachloroethene and trichloroethene.
Concentrations of chemicals detected at levels greater than their respective laboratory reporting limits were evaluated for potential risk to human health based on USEPA Regional Screening Levels (RSLs, April 2012) for Chemical Contaminants at Superfund Sites (residential and industrial scenarios for indoor air) or California Human Health Screening Levels (CHHSLs) when applicable. Soil gas to indoor air screening level concentrations have been calculated for the RSLs using residential and industrial attenuation factors of 0.002 and 0.001, respectively. In instances where the CCHSLs are used to identify screening level exceedances, the attenuation factors are estimated for a building constructed without engineered fill (no-fill) below the sub-slab. It should be noted that no indoor air RSL values are available for 1,3,5-trimethylbenzene
Technical Memorandum (Continued)
Draft Soil Gas Sampling Results August 2012, Supplemental Remedial Investigation/Feasibility Study, San Gabriel Valley Area 1 Superfund Site, South El Monte Operable Unit
Draft Draft Soil Gas Sampling Results August 2012.docx Page 4 of 11
(TMB) at this time. Therefore, the RSL for 1,2,4-TMB was applied to reported 1,3,5-TMB analytical values for screening purposes. Instances where the detected chemical concentrations exceeded the industrial and residential RSLs are highlighted in Table 1. For comparison purposes, information regarding the VOCs that are contaminants of concern in groundwater and soil gas for the South El Monte Operable Unit is shown in Table 2, Contaminants of Concern-Volatile Organic Compounds in Groundwater and Soil Gas.
As stated in the SAP, the purpose for collecting soil gas samples at the selected PRP facilities was to provide current information on residual VOC concentrations in the vadose zone at those facilities. The SAP also states that soil vapor monitoring in downgradient areas of the shallow plumes would be performed to evaluate potential groundwater to indoor air risk.
The analytical data developed during the August 2011 and August 2012 soil vapor monitoring events described in this technical memorandum provide information suitable for the purposes stated in the SAP.
The screening results for PCE from all the facility locations indicate a possibility that the vapor intrusion pathway still exists; therefore, further characterization of the areas of concern should occur.
Technical Memorandum (Continued)
Draft Soil Gas Sampling Results August 2012, Supplemental Remedial Investigation/Feasibility Study, San Gabriel Valley Area 1 Superfund Site, South El Monte Operable Unit
Draft Draft Soil Gas Sampling Results August 2012.docx Page 5 of 11
REFERENCES
CH2M Hill, 2009. Initial Evaluation of Potential Vapor Intrusion Associated with VOC Contamination in the South El Monte OU, San Gabriel Valley Superfund Site. December 16. ITSI, 2011a. Final Sampling and Analysis Plan, Supplemental Remedial Investigation/Feasibility Study, San Gabriel Valley Area 1 Superfund Site, South El Monte Operable Unit, San Gabriel Basin. March. ITSI, 2011b. Soil Vapor Monitoring-Supplemental RI/FS South El Monte OU-Additional Rationale for Monitoring Locations Technical Memorandum. May 26. ITSI, 2011c. South El Monte Operable Unit Supplemental Remedial Investigation/Feasibility Study, Soil Vapor Monitoring Results Technical Memorandum. October 31. ITSI, 2012. Second Modification to Sampling and Analysis Plan-Supplemental Remedial Investigation/Feasibility Study, San Gabriel Valley Area 1 Superfund Site, South El Monte Operable Unit. March 30. TABLES
Table 1 Soil Gas Sampling Results, August 2012, SEMOU Table 2 Contaminants of Concern–Volatile Organic Compounds in Groundwater and Soil
Gas FIGURES
Figure 1 Soil Gas Sampling Locations, August 2011 and August 2012, SEMOU ATTACHMENTS
Attachment 1 Facility Soil Gas Sampling Locations and Results Attachment 2 Data Quality Assessment
Technical Memorandum (Continued)
Draft Soil Gas Sampling Results August 2012, Supplemental Remedial Investigation/Feasibility Study, San Gabriel Valley Area 1 Superfund Site, South El Monte Operable Unit
Draft Draft Soil Gas Sampling Results August 2012.docx Page 6 of 11
TABLES
ITSI Gil ~§i if§
Table 1South El Monte OU Soil Gas Monitoring Results
August 2012
Facility Name/ Boring Location ID
Sample Depth
SampleDate 1,
1,1-
Tric
hlor
oeth
ane
1,1,
2,2-
Tetra
chlo
roet
hane
1,1,
2-Tr
ichl
oro-
1,2,
2-tri
fluor
oeth
ane
1,1,
2-Tr
ichl
oroe
than
e
1,1-
Dic
hlor
oeth
ane
1,1-
Dic
hlor
oeth
ene
1,1-
Difl
uoro
etha
ne
1,2,
3-Tr
ichl
orop
ropa
ne
1,2,
4-Tr
ichl
orob
enze
ne
1,2,
4-Tr
imet
hylb
enze
ne
1,2-
Dib
rom
oeth
ane
(ED
B)
1,2-
Dic
hlor
oben
zene
1,2-
Dic
hlor
oeth
ane
1,2-
Dic
hlor
opro
pane
1,2-
Dic
hlor
otet
raflu
oroe
than
e
1,3,
5-Tr
imet
hylb
enze
ne
1,3-
Dic
hlor
oben
zene
1,4-
Dic
hlor
oben
zene
1,4-
Dio
xane
(p-D
ioxa
ne)
Ben
zene
Bro
mom
etha
ne
Car
bon
Tetra
chlo
ride
Chl
orob
enze
ne
Chl
oroe
than
e
Chl
orof
orm
Chl
orom
etha
ne
cis-
1,2-
Dic
hlor
oeth
ylen
e
cis-
1,3-
Dic
hlor
opro
pene
Eth
ylbe
nzen
e
Hex
achl
orob
utad
iene
m,p
-Xyl
ene
Met
hyle
ne C
hlor
ide
o-X
ylen
e
Sty
rene
Tetra
chlo
roet
hene
(PC
E)
Tolu
ene
trans
-1,3
-Dic
hlor
opro
pene
Tric
hlor
oeth
ene
(TC
E)
Tric
hlor
oflu
orom
etha
ne
Vin
yl C
hlor
ide
feet Units ug/M3 ug/M3 ug/M3 ug/M3 ug/M3 ug/M3 ug/M3 ug/M3 ug/M3 ug/M3 ug/M3 ug/M3 ug/M3 ug/M3 ug/M3 ug/M3 ug/M3 ug/M3 ug/M3 ug/M3 ug/M3 ug/M3 ug/M3 ug/M3 ug/M3 ug/M3 ug/M3 ug/M3 ug/M3 ug/M3 ug/M3 ug/M3 ug/M3 ug/M3 ug/M3 ug/M3 ug/M3 ug/M3 ug/M3 ug/M3
SEMSG10-B1 5 08/15/2012 <28 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 12,000 <19 <23 33 <28 <13SEMSG10-B1 5 08/15/2012 <100 <200 <200 <100 <90 <90 ‐‐ ‐‐ <200 <100 <200 <100 <90 <100 <200 <100 <100 <100 ‐‐ <70 <90 <100 <100 <60 <100 <50 <90 <100 <100 <200 <200 <80 <100 <100 9,800 <90 <100 200 J <100 <60SEMSG10-B1 15 08/15/2012 <28 <35 <39 <28 92 89 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 730 <23 <22 <54 <44 <18 <22 <22 12,000 <19 <23 10,000 <28 <13SEMSG10-B1 15 (dup) 08/15/2012 <28 <35 <39 <28 120 98 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 850 <23 <22 <54 <44 <18 <22 <22 12,000 <19 <23 10,000 <28 <13SEMSG10-B2 5 08/15/2012 <28 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 2,600 19 <23 <27 <28 <13SEMSG10-B2 15 08/15/2012 <28 <35 <39 <28 50 <20 <27 <31 <38 36 <39 <30 <21 <47 <71 <25 <30 <30 <37 20 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 2,200 37 <23 800 <28 <13SEMSG10-B3 5 08/15/2012 <28 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 22 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 41,000 <19 <23 140 <28 <13SEMSG10-B3 15 08/15/2012 43 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 67,000 <19 <23 1,300 <28 <13
SEMSG11-B1 5 08/09/2012 <28 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 6,200 22 <23 50 <28 <13SEMSG11-B1 15 08/09/2012 <28 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 44 <23 <22 <54 <44 <18 <22 <22 6,100 28 <23 1,100 <28 <13SEMSG11-B1 15 08/09/2012 <100 <200 <200 <100 <90 <90 ‐‐ ‐‐ <200 <100 <200 <100 <90 <100 <200 <100 <100 <100 ‐‐ <70 <90 <100 <100 <60 <100 <50 100 <100 <100 <200 <200 <80 <100 <100 5,500 <90 <100 1,900 <100 <60SEMSG11-B2 5 08/09/2012 <28 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 110,000 <19 <23 1,200 <28 <13SEMSG11-B2 15 08/09/2012 <28 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 310,000 <19 <23 9,200 <28 <13SEMSG11-B3 5 08/09/2012 <28 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 170,000 <19 <23 1,300 <28 <13SEMSG11-B3 5 (dup) 08/09/2012 <690 <870 <960 <690 <1000 <500 <680 <760 <940 <620 <970 <760 <510 <1200 <1800 <620 <760 <760 <910 <400 <990 <320 <590 <670 <620 <520 <1000 <580 <550 <1300 <1100 <440 <550 <540 160,000 <480 <580 1,900 <710 <320SEMSG11-B3 15 08/09/2012 32 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 330,000 <19 <23 5,400 <28 <13
SEMSG12-B1 5 08/10/2012 <28 <35 <39 <28 830 <20 <27 <31 <38 39 <39 <30 <21 <47 <71 <25 <30 <30 <37 200 <39 <13 <23 <27 <25 <21 690 <23 230 <54 340 <18 88 <22 1,700 200 <23 1,000 <28 680
SEMSG12-B1 15 08/10/2012 <28 <35 <39 <28 800 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 34 <39 <13 250 <27 <25 <21 590 <23 <22 <54 <44 <18 <22 <22 1,600 <19 <23 1,400 <28 190
SEMSG12-B2 5 08/10/2012 <28 <35 <39 <28 400 <20 <27 <31 <38 52 <39 39 <21 <47 <71 36 <30 <30 <37 110 <39 <13 82 <27 <25 <21 420 <23 220 <54 250 <18 88 <22 750 960 <23 360 <28 380
SEMSG12-B2 5 08/10/2012 <100 <100 <200 <100 2,400 <80 ‐‐ ‐‐ <200 100 <200 70 J <90 <100 <100 80 J <100 <100 ‐‐ 300 <80 <100 100 30 J <100 <40 1,600 <100 600 <200 600 <70 200 <90 900 2,300 <100 500 <100 1,100SEMSG12-B2 15 08/10/2012 <28 <35 <39 <28 200 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 1,300 <19 <23 370 <28 <13SEMSG12-B3 5 08/10/2012 <28 <35 <39 <28 190 <20 <27 <31 <38 27 <39 <30 <21 <47 <71 <25 <30 <30 <37 75 <39 <13 <23 <27 <25 <21 530 <23 41 <54 66 <18 33 <22 420 67 <23 220 <28 190
SEMSG12-B3 15 08/10/2012 <28 <35 <39 <28 50 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 2,600 <19 <23 900 <28 <13
SEMSG13-B1 5 08/08/2012 43 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 73,000 <19 <23 84 <28 <13SEMSG13-B1 15 08/08/2012 43 <35 <39 <28 <41 <20 <27 <31 <38 26 <39 <30 <21 <47 <71 <25 <30 <30 <37 32 <39 <13 <23 <27 <25 22 <40 <23 <22 <54 55 <18 32 <22 60,000 30 <23 130 <28 <13SEMSG13-B2 5 08/08/2012 <28 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 31,000 <19 <23 33 <28 <13SEMSG13-B2 15 08/08/2012 <28 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 28,000 <19 <23 160 <28 <13SEMSG13-B3 5 08/09/2012 R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R RSEMSG13-B3 5 08/09/2012 <280 <350 <390 <280 <410 <200 <270 <310 <380 <250 <390 <300 <210 <470 <710 <250 <300 <300 <370 <160 <390 <130 <230 <270 <250 <210 <400 <230 <220 <540 <440 <180 <220 <220 42,000 <190 <230 <270 <280 <130SEMSG13-B3 15 08/09/2012 29 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 40,000 <19 <23 64 <28 <13
SEMSG14-B1 5 08/17/2012 240 <35 460 <28 <41 <20 <27 <31 <38 300 <39 <30 <21 <47 <71 71 <30 39 <37 20 <39 <13 150 <27 110 <21 <40 <23 <22 <54 <44 <18 <22 <22 14,000,000 <19 <23 8,500 <28 <13SEMSG14-B1 15 08/17/2012 2,100 <35 6,300 150 <41 610 <27 <31 <38 63 <39 <30 <21 <47 <71 <25 33 <30 <37 21 <39 <13 590 <27 210 <21 280 <23 27 <54 <44 150 <22 <22 36,000,000 100 <23 11,000 <28 <13SEMSG14-B1 15 (dup) 08/17/2012 <140000 <170000 <190000 <140000 <210000 <100000 <140000 <150000 <190000 <120000 <190000 <150000 <100000 <230000 <350000 <120000 <150000 <150000 <180000 <81000 <200000 <64000 <120000 <130000 <120000 <100000 <200000 <120000 <110000 <270000 <220000 <88000 <110000 <110000 43,000,000 <95000 <120000 <140000 <140000 <65000SEMSG14-B2 5 08/20/2012 <140000 <170000 <190000 <140000 <210000 <100000 <140000 <150000 <190000 <120000 <190000 <150000 <100000 <230000 <350000 <120000 <150000 <150000 <180000 <81000 <200000 <64000 <120000 <130000 <120000 <100000 <200000 <120000 <110000 <270000 <220000 <88000 <110000 <110000 11,000,000 <95000 <120000 <140000 <140000 <65000SEMSG14-B2 15 08/20/2012 <140000 <170000 <190000 <140000 <210000 <100000 <140000 <150000 <190000 <120000 <190000 <150000 <100000 <230000 <350000 <120000 <150000 <150000 <180000 <81000 <200000 <64000 <120000 <130000 <120000 <100000 <200000 <120000 <110000 <270000 <220000 <88000 <110000 <110000 24,000,000 <95000 <120000 <140000 <140000 <65000SEMSG14-B3 5 08/20/2012 <140000 <170000 <190000 <140000 <210000 <100000 <140000 <150000 <190000 <120000 <190000 <150000 <100000 <230000 <350000 <120000 <150000 <150000 <180000 <81000 <200000 <64000 <120000 <130000 <120000 <100000 <200000 <120000 <110000 <270000 <220000 <88000 <110000 <110000 4,400,000 <95000 <120000 <140000 <140000 <65000SEMSG14-B3 5 08/20/2012 <24000 <30000 <34000 <24000 <18000 <18000 ‐‐ ‐‐ <33000 <22000 <34000 <27000 <18000 <20000 <31000 <22000 <27000 <27000 ‐‐ <14000 <17000 <28000 <20000 <12000 <22000 <9100 <18000 <20000 <19000 <47000 <38000 <15000 <19000 <19000 1,900,000 <17000 <20000 <24000 <25000 <11000SEMSG14-B3 15 08/20/2012 <140000 <170000 <190000 <140000 <210000 <100000 <140000 <150000 <190000 <120000 <190000 <150000 <100000 <230000 <350000 <120000 <150000 <150000 <180000 <81000 <200000 <64000 <120000 <130000 <120000 <100000 <200000 <120000 <110000 <270000 <220000 <88000 <110000 <110000 21,000,000 <95000 <120000 <140000 <140000 <65000
SEMSG15-B1 5 08/13/2012 57 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 31,000 <19 <23 110 <28 <13SEMSG15-B1 13 08/13/2012 49 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 24,000 22 <23 130 <28 <13SEMSG15-B2 5 08/13/2012 48 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 72,000 <19 <23 490 <28 <13SEMSG15-B2 15 08/13/2012 46 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 61,000 <19 <23 650 <28 <13SEMSG15-B2 15 (dup) 08/13/2012 <690 <870 <960 <690 <1000 <500 <680 <760 <940 <620 <970 <760 <510 <1200 <1800 <620 <760 <760 <910 <400 <990 <320 <590 <670 <620 <520 <1000 <580 <550 <1300 <1100 <440 <550 <540 67,000 <480 <580 910 <710 <320SEMSG15-B3 5 08/13/2012 <28 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 35,000 <19 <23 46 <28 <13SEMSG15-B3 15 08/13/2012 39 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 140,000 <19 <23 270 <28 <13SEMSG15-B3 15 08/13/2012 <2400 <3000 <3400 <2400 <1800 <1700 ‐‐ ‐‐ <3200 <2200 <3400 <2600 <1800 <2000 <3100 <2200 <2600 <2600 ‐‐ <1400 <1700 <2800 <2000 <1200 <2100 <900 <1700 <2000 <1900 <4700 <3800 <1500 <1900 <1900 120,000 <1600 <2000 <2400 <2500 <1100
SEMSG16-B1 (1PV) 5 08/07/2012 50 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 4,100 <19 <23 71 <28 <13 SEMSG16-B1 (3PV) 5 08/07/2012 42 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 4,200 <19 <23 79 <28 <13SEMSG16-B1 (10PV) 5 08/07/2012 49 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 4,100 <19 <23 60 <28 <13SEMSG16-B1 (1PV) 15 08/07/2012 67 <35 <39 <28 240 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 25 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 4,300 <19 <23 930 <28 <13SEMSG16-B1 (3PV) 15 08/07/2012 65 <35 <39 <28 120 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 5,200 <19 <23 1,100 <28 <13SEMSG16-B1 (10PV) 15 08/07/2012 69 <35 <39 <28 77 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 6,000 <19 <23 1,200 <28 <13SEMSG16-B2 5 08/07/2012 67 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 4,000 <19 <23 120 <28 <13SEMSG16-B2 5 (dup) 08/07/2012 65 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 3,700 24 <23 110 <28 <13SEMSG16-B2 15 08/07/2012 54 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 2,800 <19 <23 <27 <28 <13
SEMSG17-B1 5 08/16/2012 <28 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 30 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 63,000 <19 <23 6,900 <28 <13SEMSG17-B1 5 08/16/2012 <100 <200 <200 <100 <100 <100 ‐‐ ‐‐ <200 <100 <200 <100 <100 <100 <200 <100 <100 <100 ‐‐ 40 J <100 <200 <100 <70 <100 <50 <100 <100 <100 <300 <200 <90 <100 <100 38,000 <90 <100 4,900 <100 <60SEMSG17-B1 15 08/16/2012 <28 <35 <39 <28 72 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 49 <21 390 <23 <22 <54 <44 <18 <22 <22 120,000 <19 <23 41,000 <28 <13SEMSG17-B2 5 08/15/2012 <28 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 18 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 130,000 <19 <23 2,700 <28 <13SEMSG17-B2 15 08/15/2012 <28 <35 <39 <28 160 29 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 17 <39 <13 <23 <27 59 <21 1,100 <23 <22 <54 <44 <18 <22 <22 87,000 <19 <23 37,000 <28 <13SEMSG17-B3 5 08/15/2012 <28 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 41 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 44,000 <19 <23 6,100 <28 <13SEMSG17-B3 15 08/15/2012 <28 <35 <39 <28 96 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 26 <21 320 <23 <22 <54 <44 <18 <22 <22 65,000 <19 <23 26,000 <28 <13
SEMSG18-B1 5 08/17/2012 <28 <35 100 <28 <41 <20 <27 <31 <38 42,000 <39 <30 <21 <47 <71 18,000 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 6,200 <23 980 <54 3,700 <18 2,600 <22 2,000 69 <23 310 <28 <13SEMSG18-B1 15 08/17/2012 <28 <35 250 <28 51 58 <27 <31 <38 45,000 <39 <30 <21 <47 <71 14,000 <30 <30 <37 22 <39 <13 <23 <27 <25 <21 26,000 <23 3,000 <54 13,000 <18 8,400 <22 820 300 <23 340 <28 <13SEMSG18-B1 15 08/17/2012 <25000 <32000 <35000 <25000 <19000 <18000 ‐‐ ‐‐ <34000 88,000 <35000 <28000 <19000 <21000 <32000 24,000 <28000 <28000 ‐‐ <15000 <18000 <29000 <21000 <12000 <23000 <9500 38,000 <21000 <20000 <49000 <40000 <16000 <20000 <20000 <31000 <17000 <21000 <25000 <26000 <12000SEMSG18-B2 5 08/17/2012 37 <35 <39 <28 <41 <20 <27 <31 <38 950 <39 <30 <21 <47 <71 230 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 53 <18 45 <22 25,000 <19 <23 3,400 <28 <13SEMSG18-B2 15 08/17/2012 54 <35 <39 <28 <41 <20 <27 <31 <38 440 <39 <30 <21 <47 <71 140 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 660 <23 <22 <54 <44 <18 <22 <22 45,000 <19 <23 27,000 <28 <13SEMSG18-B3 5 08/16/2012 64 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 30,000 <19 <23 2,000 <28 <13SEMSG18-B3 15 08/16/2012 70 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 32,000 <19 <23 3,000 <28 <13
SEMSG19-B1 5 08/20/2012 46 <35 <39 <28 <41 <20 <27 <31 <38 41 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 130,000 <19 <23 1,300 <28 <13SEMSG19-B1 15 08/20/2012 98 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 260,000 <19 <23 6,400 <28 <13SEMSG19-B1 15 (dup) 08/20/2012 <690 <870 <960 <690 <1000 <500 <680 <760 <940 <620 <970 <760 <510 <1200 <1800 <620 <760 <760 <910 <400 <990 <320 <590 <670 <620 <520 <1000 <580 <550 <1300 <1100 <440 <550 <540 260,000 <480 <580 5,400 <710 <320SEMSG19-B2 5 08/20/2012 35 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 87,000 19 <23 290 <28 <13SEMSG19-B2 15 08/20/2012 74 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 260,000 <19 <23 1,600 <28 <13
Astro Seal, Inc.
Astronautic Enamelers
Cooper Drum Company
Custom Metal Products, Inc.
Hytone Cleaners
J. A. Bozung Co.
Mammoet Western Inc.
Manufacturer's Services Inc.
Phillips & Malone
Servex Corporation
Table 1South El Monte OU Soil Gas Monitoring Results
August 2012
Facility Name/ Boring Location ID
Sample Depth
SampleDate 1,
1,1-
Tric
hlor
oeth
ane
1,1,
2,2-
Tetra
chlo
roet
hane
1,1,
2-Tr
ichl
oro-
1,2,
2-tri
fluor
oeth
ane
1,1,
2-Tr
ichl
oroe
than
e
1,1-
Dic
hlor
oeth
ane
1,1-
Dic
hlor
oeth
ene
1,1-
Difl
uoro
etha
ne
1,2,
3-Tr
ichl
orop
ropa
ne
1,2,
4-Tr
ichl
orob
enze
ne
1,2,
4-Tr
imet
hylb
enze
ne
1,2-
Dib
rom
oeth
ane
(ED
B)
1,2-
Dic
hlor
oben
zene
1,2-
Dic
hlor
oeth
ane
1,2-
Dic
hlor
opro
pane
1,2-
Dic
hlor
otet
raflu
oroe
than
e
1,3,
5-Tr
imet
hylb
enze
ne
1,3-
Dic
hlor
oben
zene
1,4-
Dic
hlor
oben
zene
1,4-
Dio
xane
(p-D
ioxa
ne)
Ben
zene
Bro
mom
etha
ne
Car
bon
Tetra
chlo
ride
Chl
orob
enze
ne
Chl
oroe
than
e
Chl
orof
orm
Chl
orom
etha
ne
cis-
1,2-
Dic
hlor
oeth
ylen
e
cis-
1,3-
Dic
hlor
opro
pene
Eth
ylbe
nzen
e
Hex
achl
orob
utad
iene
m,p
-Xyl
ene
Met
hyle
ne C
hlor
ide
o-X
ylen
e
Sty
rene
Tetra
chlo
roet
hene
(PC
E)
Tolu
ene
trans
-1,3
-Dic
hlor
opro
pene
Tric
hlor
oeth
ene
(TC
E)
Tric
hlor
oflu
orom
etha
ne
Vin
yl C
hlor
ide
SEMSG20-B1 5 08/14/2012 <28 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 170 <21 <40 <23 <22 <54 <44 <18 <22 <22 13,000 <19 <23 <27 <28 <13SEMSG20-B1 15 08/14/2012 <28 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 21,000 <19 <23 62 <28 <13SEMSG20-B2 5 08/14/2012 200 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 92,000 19 <23 750 <28 <13SEMSG20-B2 15 08/14/2012 290 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 25 <40 <23 <22 <54 <44 <18 <22 <22 110,000 <19 <23 2,000 <28 <13SEMSG20-B2 15 08/14/2012 300 <200 <200 <100 <100 <90 ‐‐ ‐‐ <200 <100 <200 <100 <100 <100 <200 <100 <100 <100 ‐‐ <80 <90 <100 <100 <60 <100 <50 <90 <100 <100 <300 <200 <80 <100 <100 110,000 <90 <100 2,500 <100 <60SEMSG20-B3 5 08/14/2012 57 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 12,000 <19 <23 77 <28 <13SEMSG20-B3 15 08/14/2012 73 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 19,000 <19 <23 280 <28 <13
SEMSG21-B1 5 08/08/2012 40 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 2,600 <19 <23 29 <28 <13SEMSG21-B1 5 (dup) 08/08/2012 44 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 2,500 <19 <23 <27 <28 <13SEMSG21-B1 15 08/08/2012 73 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 4,500 <19 <23 280 <28 <13SEMSG21-B2 5 08/08/2012 33 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 45 <18 25 <22 490 43 <23 <27 74 <13SEMSG21-B2 15 08/08/2012 41 <35 <39 <28 42 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 22 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 69 <18 32 <22 750 74 <23 140 61 <13SEMSG21-B3 5 08/08/2012 89 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 17 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 45 <18 <22 <22 220 61 <23 <27 460 <13SEMSG21-B3 15 08/08/2012 49 <35 <39 <28 220 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 170 <19 <23 <27 130 <13SEMSG21-B3 15 08/08/2012 50 <10 <20 <10 200 <8 ‐‐ ‐‐ <20 <10 <20 <10 <9 <10 <10 <10 <10 <10 ‐‐ 6 J <8 <10 <10 <6 <10 <4 <8 <10 <9 <20 <20 4 J <9 <9 100 7 J <10 20 500 <5
SEMSG22-B1 5 08/14/2012 210 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 120 <21 <40 <23 <22 <54 <44 <18 <22 <22 4,000 <19 <23 260 <28 <13SEMSG22-B1 15 08/14/2012 560 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 39,000 <19 <23 5,500 <28 <13SEMSG22-B2 5 08/14/2012 210 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 3,300 <19 <23 82 <28 <13SEMSG22-B2 5 (dup) 08/14/2012 240 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 3,900 <19 <23 84 <28 <13SEMSG22-B2 15 08/14/2012 650 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 18 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 27,000 <19 <23 1,800 <28 <13
SEMSG23-B1 5 08/16/2012 85 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 39,000 <19 <23 120 <28 <13SEMSG23-B1 15 08/16/2012 230 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 20 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 74,000 <19 <23 1,000 <28 <13SEMSG23-B1 15 (dup) 08/16/2012 <690 <870 <960 <690 <1000 <500 <680 <760 <940 <620 <970 <760 <510 <1200 <1800 <620 <760 <760 <910 <400 <990 <320 <590 <670 <620 <520 <1000 <580 <550 <1300 <1100 <440 <550 <540 78,000 <480 <580 990 <710 <320SEMSG23-B2 5 08/16/2012 110 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 33,000 <19 <23 190 <28 <13SEMSG23-B2 15 08/16/2012 160 <35 <39 <28 51 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 50,000 <19 <23 160 <28 <13
SEMSG25-B1 5 08/10/2012 <28 <35 170 <28 2,400 33 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 29 <39 <13 <23 <27 <25 <21 570 <23 <22 <54 <44 <18 <22 <22 830 39 <23 1,200 <28 600
SEMSG25-B1 15 08/10/2012 <28 <35 190 <28 4,100 140 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 49 <39 <13 <23 <27 <25 <21 3,000 <23 <22 <54 <44 <18 <22 <22 370 28 <23 1,500 <28 2,400
SEMSG25-B1 15 (dup) 08/10/2012 <28 <35 190 <28 3,300 140 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 34 <39 <13 <23 <27 <25 <21 2,800 <23 <22 <54 <44 <18 <22 <22 370 <19 <23 1,400 <28 2,200
SEMSG25-B2 5 08/10/2012 140 <35 650 <28 2,800 35 <27 <31 <38 <25 <39 <30 <21 85 <71 <25 <30 <30 <37 28 <39 <13 <23 <27 33 <21 1,900 <23 <22 <54 <44 <18 <22 <22 27,000 64 <23 15,000 <28 35
SEMSG25-B2 15 08/10/2012 200 <35 390 <28 4,300 <20 <27 <31 <38 <25 <39 <30 <21 270 <71 <25 <30 <30 <37 19 <39 <13 40 <27 <25 <21 4,300 <23 <22 <54 <44 <18 <22 <22 89,000 20 <23 28,000 <28 42
SEMSG25-B3 5 08/13/2012 <28 <35 <39 <28 <41 <20 <27 <31 <38 28 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 2,400 <19 <23 <27 <28 <13SEMSG25-B3 15 08/13/2012 79 <35 <39 <28 <41 <20 <27 <31 <38 <25 <39 <30 <21 <47 <71 <25 <30 <30 <37 <16 <39 <13 <23 <27 <25 <21 <40 <23 <22 <54 <44 <18 <22 <22 3,300 <19 <23 180 <28 <13
Screening Level for Soil Gas ‐ Residential¹ 990000 15500000² 750² 105000² 1050² 3650² 120² 3650² NA 110² 36 26000² 55² 47000² 16000 420 320000 48000² 3200000 180 140000 530 13Screening Level for Soil Gas‐ Industrial ¹ 2800000 130000000² 7700² 880000² 8800² 47000² 1200² 47000² NA 1100² 120 220000² 530² 390000² 44000 1400 890000 1200000² 8800000 600 380000 1800 45
Detected results shown in bold.Results shown in italics are from split‐samples analyzed by the EPA Region 9 Laboratory.
exceeds Industrial and Residential Screening Levelexceeds Residential Screening Level
¹CA State Office of Environmental Health Hazard Assessment (OEHHA), September, 2010, Table 3‐ Soil Gas Screening Numbers for Volatile Chemicals Below Buildings Constructed Without Engineered Fill Below Sub‐Slab , unless otherwise noted. Screening levels represent the most conservative criteria which is no‐fill. ² Based on USEPA Regional Screening Levels (RSLs; April 2012) for Residential and Industrial. Calculated using a default soil gas to indoor air attenuation factor of 0.002 for Residential, and 0.001 for Industrial (U.S.EPA,2008 and DTSC,2005). dup = duplicate sampleJ = Concentration is estimated. Primary reason is because it falls between the method detection limit and laboratory reporting limit.NA = screening level not availableug/m3 = micrograms per cubic meterR = sample was rejected and re‐analyzed due to the detection of 1,1‐DFA‐‐ = compound not reported by Region 9 Laboratory
Screening Criteria
International Medication Systems Ltd.
Let's Go Precision Products
Pacific Coast Drum Company
Western Markings Inc.
Cardinal Industrial Finishes
Technical Memorandum (Continued)
Draft Soil Gas Sampling Results August 2012, Supplemental Remedial Investigation/Feasibility Study, San Gabriel Valley Area 1 Superfund Site, South El Monte Operable Unit
Draft Draft Soil Gas Sampling Results August 2012.docx Page 7 of 11
TABLE 2
South El Monte Operable Unit
Contaminants of Concern – Volatile Organic Compounds in Groundwater and Soil Gas
Parameter
Groundwater MCLa (or CA DHS
NL) (µg/L)
EPA Method 524.2 Water
Quantitation Limit (µg/L)
Screening Level for Soil Gas -Residential (µg/m3) b
Screening
Level for Soil Gas -Industrial
(µg/m3) b
TO-15 Air
Quantitation Limit (µg/m3)
EPA 9 Laboratory
1,1-Dichloroethane
5 0.5 750 c 7,700 c
4
1,1-Dichloroethene
6 0.5 105,000 c 880,000 c
4
1,2,3-Trichloropropane
NE
(CA DHS 0.005)
CA DHS
0.005
155 c 1,300 c
6
Tetrachloroethene
5 0.5 180 600
6.8
Trichloroethene
5 0.5 530 1,800
5.4
cis-1,2-Dichloroethene
6 0.5 16,000 44,000
4
1,4-Dioxane
See Table 3-2d See Table 3-2d -- --
3.6
Notes a State of California Primary Maximum Contaminant Level (MCL). b California State Office of Environmental Health Hazard Assessment (OEHHA), September 2010, Table 3 – Soil Gas
Screening Numbers for Volatile Chemicals Below Buildings Constructed Without Engineered Fill Below Sub-Slab Gravel, unless otherwise noted. This table represents the most conservative criteria which is no-fill.
c EPA Regional Screening Levels (RSLs) for indoor air used as a basis (EPA, 2012). Soil gas screening levels are based on California’s recommended attenuation factors from soil gas to indoor air (Cal/EPA, 2005).
d Sampling and Analysis Plan, Supplemental Remedial Investigation/Feasibility Study, San Gabriel Valley Area 1 Superfund Site, South El Monte Operable Unit, San Gabriel Basin, 2010, Table 3-2
µg/L = micrograms per liter MCL = Maximum Contaminant Level µg/m3 = micrograms per cubic meter NE = not established CA DHS = California Dept of Health Services NL = (CA DHS) Notification Level EPA 9 = U.S. EPA, Region 9 RSL = (EPA R9) Regional Screening Level
Technical Memorandum (Continued)
Draft Soil Gas Sampling Results August 2012, Supplemental Remedial Investigation/Feasibility Study, San Gabriel Valley Area 1 Superfund Site, South El Monte Operable Unit
Draft Draft Soil Gas Sampling Results August 2012.docx Page 8 of 11
FIGURES
ITSI Gil ~§i if§
1000
100
10
5
1
100
10
100
51100
50
105 10
10
5
100
10
10
50
50
10
GENCORP-AEROJET*
SOUTHERNCALIFORNIA
EDISON
CHAMPCORPORATION
WALL MACHINEWORKSINC.
ROC-AIRECORP.
FLEXFIRMPRODS
INACTIVE NIKEMISSILE SITE
LA VICTORIA
PLASTICDRESS-UPCOMPANY
LAWRENCEEQUIPMENT
DYANCOINC.
COMPRESSORPARTS &
REPAIR,INC.
JAMESANDRUSS'PROPERTY
DURHAMTRANSPORTATION MARGE
CARSONINC.
CRANVEYORCORPORATION
LOS ANGELESDIE MOLD
FORMS ANDSURFACES,
INC.
SARGENT-FLETCHERCO.
SBICCA OFCALIFORNIA
IRISHCONSTRUCTION
R&R CUSTOMCOACHWORKS,
INC.
AREMAC HEATTREATING
INC.
AIR DISTRIBUTIONPRODUCTS, INC
YIRNG SHENG CO.
DELLACORCO., INC.
MULTICHEMICALPRODUCTS
CALIFORNIAALLOYCO.DIV.ROLOCK
SCANBE DIVISION OFZERO CORP.
TRI-FITTINGMFG. CO.
CLAMP MAN. CO.
%
J.A. BOZUNG CO.
%
PALMER BATTERY*(RU-MORE)
%
MANUFACTURER'SSERVICE, INC.
%
J.C. INC.BARRY
ZWAHLEN
%
PACIFIC COAST DRUM COMPANY
%
CHEMRITECORP.
%
COOPERDRUM
COMPANY%TED LEVINE
DRUM COMPANY
%
CUSTOM METALPRODUCTS, INC.
% MAMMOETWESTERN, INC.
% ANCHORPLATINGCO., INC.
%
ONE DOLLAR CLEANERS
%
HYTONECLEANERS
%
EPAW416
%
EPAW414")
")
%
ASTRONAUTIC ENAMELERS
SERVEX
%
ARTISTICPOLISHING
%SMITTYBUILT,INC.
%
EEMUS MFG.
%
EAGLE METAL FINISHING
%
LETS GO PRECISION
%
WESTERNMARKINGS
INC
%
IMS LTD.
%
LEE PHARMACEUTICALS
%
PHILLIPS AND MALONE
%
CARDINAL INDUSTRIALFINISHES
%
SEACHROMECORPORATION
%
ASTRO SEAL, INC.
§̈¦10
§̈¦605
ST60
ST19
ST60
ST19
P
eck
Rd
T
yler
Ave
Rush St.
D
urfe
e Ave
Ga rv ey Ave
Val ley Blvd
W
alnu
t Gro
ve A
ve
Peck
Rd
Santa Anita
Ave
Durfee Ave
G:\ArcGIS\EPA\S_El_Monte\PROJECTS\Soil_Gas\Tech_Memo_2012_Oct\Figure_1.mxd 10/17/2012 [13:06 PM] LCARR, ITSI
Draft Soil Gas Sampling Results, August 2012Supplemental Remedial Investigation/Feasibility Study
San Gabriel Valley Area 1 Superfund Site, South El Monte Operable UnitLos Angeles County, California
USEPA Region 9
FIGURE 1SOIL GAS SAMPLING LOCATIONSAUGUST 2011 AND AUGUST 2012
Facility Sampled in 2012
Estimated Groundwater VOC Plume - Shallow Zone Sept/Oct 2011 data (ug/L)
OU Boundary
"!O0 1,500 3,000750
FEET
HYTONE CLEANERS
ARTISTIC POLISHING
ONE DOLLAR CLEANER
RED TEXT: SITE SAMPLED IN AUGUST 2012
GREEN TEXT: SITE SAMPLED IN AUGUST 2011
BLUE TEXT: SITE NOT SAMPLED
Facility Outline
* Downgradient Soil Gas Samples at Palmer Battery were collected in 2011. Site access was not granted for proposed 2012 soil gas sampling.
Technical Memorandum (Continued)
Draft Soil Gas Sampling Results August 2012, Supplemental Remedial Investigation/Feasibility Study, San Gabriel Valley Area 1 Superfund Site, South El Monte Operable Unit
Draft Draft Soil Gas Sampling Results August 2012.docx Page 9 of 11
ATTACHMENTS
ITSI Gil ~§i if§
Technical Memorandum (Continued)
Draft Soil Gas Sampling Results August 2012, Supplemental Remedial Investigation/Feasibility Study, San Gabriel Valley Area 1 Superfund Site, South El Monte Operable Unit
Draft Draft Soil Gas Sampling Results August 2012.docx Page 10 of 11
ATTACHMENT 1
Facility Soil Gas Locations and Results
ITSI Gil ~§i if§
G:\ArcGIS\EPA\S_El_Monte\PROJECTS\Soil_Gas\Tech_Memo_2012_Oct\SG_Astro_Seal.mxd 10/17/2012 [13:34 PM] LCARR, ITSI
FIGURE 1SOIL GAS WELL LOCATIONS AND TCE/PCE RESULTS
Astro Seal Incorporated9448 Rush Street, South El Monte, California (Current Address)
Soil Gas Boring Location##
NOTES:1) -Data results that are highlighted in red exceed Industrial and Residential Risk Screening Levels. -Data results that are highlighted in yellow exceed Residential Risk Screening Levels.
2) <27 = Not detected at analytical reporting limit.
50 0 50
Feet
o
Facility Boundary
SAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG10-B1 5 12,000 33SEMSG10-B1 15 12,000 10,000SEMSG10-B1 15 (dup) 12,000 10,000
SAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG10-B2 5 2,600 <27SEMSG10-B2 15 2,200 800
SAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG10-B3 5 41,000 140SEMSG10-B3 15 67,000 1,300
ATTACHMENT 1DRAFT SOIL GAS SAMPLING RESULTS AUGUST 2012Supplemental Remedial Investigation/Feasibility Study
San Gabriel Valley Area 1 Superfund Site - South El Monte Operable UnitLos Angeles County, California
G:\ArcGIS\EPA\S_El_Monte\PROJECTS\Soil_Gas\Tech_Memo_2012_Oct\SG_Astronautic_Enamelers.mxd 10/17/2012 [13:35 PM] LCARR, ITSI
FIGURE 2SOIL GAS WELL LOCATIONS AND TCE/PCE RESULTS
Astronautic Enamelers9758 Klingerman Street, South El Monte, California
Soil Gas Boring Location##
NOTE:1) -Data results that are highlighted in red exceed Industrial and Residential Risk Screening Levels. -Data results that are highlighted in yellow exceed Residential Risk Screening Levels.
30 0 30
Feet
o
SAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG11-B2 5 110,000 1,200SEMSG11-B2 15 310,000 9,200
SAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG11-B3 5 170,000 1,300SEMSG11-B3 5 (dup) 160,000 1,900SEMSG11-B3 15 330,000 5,400
SAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG11-B1 5 6,200 50SEMSG11-B1 15 6,100 1,100
Facility Boundary
ATTACHMENT 1DRAFT SOIL GAS SAMPLING RESULTS AUGUST 2012Supplemental Remedial Investigation/Feasibility Study
San Gabriel Valley Area 1 Superfund Site - South El Monte Operable UnitLos Angeles County, California
G:\ArcGIS\EPA\S_El_Monte\PROJECTS\Soil_Gas\Tech_Memo_2012_Oct\SG_Cooper_Drum.mxd 10/17/2012 [13:31 PM] LCARR, ITSI
FIGURE 3SOIL GAS WELL LOCATIONS AND TCE/PCE RESULTS
Cooper Drum Company9629 El Poche Street, South El Monte, California
Soil Gas Boring Location##
30 0 30
Feet
o
SAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG12-B1 5 1,700 1,000SEMSG12-B1 15 1,600 1,400
SAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG12-B2 5 750 360SEMSG12-B2 15 1,300 370
SAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG12-B3 5 420 220SEMSG12-B3 15 2,600 900
Facility Boundary
NOTE:1) -Data results that are highlighted in red exceed Industrial and Residential Risk Screening Levels. -Data results that are highlighted in yellow exceed Residential Risk Screening Levels.
ATTACHMENT 1DRAFT SOIL GAS SAMPLING RESULTS AUGUST 2012Supplemental Remedial Investigation/Feasibility Study
San Gabriel Valley Area 1 Superfund Site - South El Monte Operable UnittLos Angeles County, California
G:\ArcGIS\EPA\S_El_Monte\PROJECTS\Soil_Gas\Tech_Memo_2012_Oct\SG_Custom_Metal.mxd 10/17/2012 [13:32 PM] LCARR, ITSI
FIGURE 4SOIL GAS WELL LOCATIONS AND TCE/PCE RESULTS
Custom Metal Products, Incorporated1524 Chico Avenue, South El Monte, California
Soil Gas Boring Location##
NOTES:1) Data results that are highlighted in red exceedIndustrial and Residential Risk Screening Levels.
2) R = Sample was rejected and re-analyzed due to the detection of 1,1-DFA(leak detection compound).
3) <270 = Not detected at analytical reporting limit.
50 0 50
Feet
o
Facility Boundary
SAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG13-B1 5 73,000 84SEMSG13-B1 15 60,000 130
SAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG13-B2 5 31,000 33SEMSG13-B2 15 28,000 160
SAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG13-B3 5 R RSEMSG13-B3 5 42,000 <270SEMSG13-B3 15 40,000 64
ATTACHMENT 1DRAFT SOIL GAS SAMPLING RESULTS AUGUST 2012Supplemental Remedial Investigation/Feasibility Study
San Gabriel Valley Area 1 Superfund Site - South El Monte Operable UnittLos Angeles County, California
G:\ArcGIS\EPA\S_El_Monte\PROJECTS\Soil_Gas\Tech_Memo_2012_Oct\SG_Hytone_Cleaner.mxd 10/17/2012 [13:37 PM] LCARR, ITSI
FIGURE 5SOIL GAS WELL LOCATIONS AND TCE/PCE RESULTS
Hytone Cleaners2702 North Mountain View Road, El Monte, California
Soil Gas Boring Location##
30 0 30
Feet
o
SAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG14-B1 5 14,000,000 8,500SEMSG14-B1 15 36,000,000 11,000SEMSG14-B1 15 (dup) 43,000,000 <140,000
SAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG14-B2 5 11,000,000 <140,000SEMSG14-B2 15 24,000,000 <140,000
SAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG14-B3 5 4,400,000 <140,000SEMSG14-B3 15 21,000,000 <140,000
NOTES:1)- Data results that are highlighted in red exceed Industrial and Residential Risk Screening Levels;
2) <140,000 = Not detected at analytical reporting limit.
Facility Boundary
ATTACHMENT 1DRAFT SOIL GAS SAMPLING RESULTS AUGUST 2012Supplemental Remedial Investigation/Feasibility Study
San Gabriel Valley Area 1 Superfund Site - South El Monte Operable UnitLos Angeles County, California
G:\ArcGIS\EPA\S_El_Monte\PROJECTS\Soil_Gas\Tech_Memo_2012_Oct\SG_Bozung.mxd 10/17/2012 [13:40 PM] LCARR, ITSI
FIGURE 6SOIL GAS WELL LOCATIONS AND TCE/PCE RESULTS
J.A. Bozung Company9401 Whitmore Street, El Monte, California
Soil Gas Boring Location##
50 0 50
Feet
o
NOTE:1) -Data results that are highlighted in red exceed Industrial and Residential Risk Screening Levels. -Data results that are highlighted in yellow exceed Residential Risk Screening Levels.
SAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG15-B1 5 31,000 110SEMSG15-B1 13 24,000 130
SAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG15-B2 5 72,000 490SEMSG15-B2 15 61,000 650SEMSG15-B2 15 (dup) 67,000 910
SAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG15-B3 5 35,000 46SEMSG15-B3 15 140,000 270
Facility Boundary
ATTACHMENT 1DRAFT SOIL GAS SAMPLING RESULTS AUGUST 2012Supplemental Remedial Investigation/Feasibility Study
San Gabriel Valley Area 1 Superfund Site - South El Monte Operable UnitLos Angeles County, California
G:\ArcGIS\EPA\S_El_Monte\PROJECTS\Soil_Gas\Tech_Memo_2012_Oct\SG_Mammoet_Western.mxd 10/17/2012 [13:41 PM] LCARR, ITSI
FIGURE 7SOIL GAS WELL LOCATIONS AND TCE/PCE RESULTS
Mammoet Western Incorporated1419 Potrero Avenue, South El Monte, California
Soil Gas Boring Location##
50 0 50
Feet
o
SAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG16-B2 5 4,000 120SEMSG16-B2 5 (dup) 3,700 110SEMSG16-B2 15 2,800 <27
NOTES:1)- Data results that are highlighted in red exceed Industrial and Residential Risk Screening Levels. -Data results that are highlighted in yellow exceed Residential Risk Screening Levels.
2) <27 = Not detected at analytical reporting limit.
3) PV = Purge volume test results.
Facility BoundarySAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG16-B1 (1PV) 5 4,100 71SEMSG16-B1 (3PV) 5 4,200 79SEMSG16-B1 (10PV) 5 4,100 60SEMSG16-B1 (1PV) 15 4,300 930SEMSG16-B1 (3PV) 15 5,200 1,100SEMSG16-B1 (10PV) 15 6,000 1,200
ATTACHMENT 1DRAFT SOIL GAS SAMPLING RESULTS AUGUST 2012Supplemental Remedial Investigation/Feasibility Study
San Gabriel Valley Area 1 Superfund Site - South El Monte Operable UnitLos Angeles County, California
G:\ArcGIS\EPA\S_El_Monte\PROJECTS\Soil_Gas\Tech_Memo_2012_Oct\SG_Manufacturers_Services.mxd 10/17/2012 [13:44 PM] LCARR, ITSI
FIGURE 8SOIL GAS BORING LOCATIONS AND TCE/PCE RESULTS
Manufacturer's Services Incorporated - 2210 Chico AvenueElegant Cabinets - 2218 Chico Avenue
South El Monte, California
Soil Gas Boring Location##
NOTE:1) -Data results that are highlighted in red exceed Industrial and Residential Risk Screening Levels.
30 0 30
Feet
o
SAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG17-B1 5 63,000 6,900SEMSG17-B1 15 120,000 41,000
SAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG17-B2 5 130,000 2,700SEMSG17-B2 15 87,000 37,000
SAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG17-B3 5 44,000 6,100SEMSG17-B3 15 65,000 26,000
Facility Boundary
ATTACHMENT 1DRAFT SOIL GAS SAMPLING RESULTS AUGUST 2012Supplemental Remedial Investigation/Feasibility Study
San Gabriel Valley Area 1 Superfund Site - South El Monte Operable UnitLos Angeles County, California
G:\ArcGIS\EPA\S_El_Monte\PROJECTS\Soil_Gas\Tech_Memo_2012_Oct\SG_Phillips_Malone.mxd 10/17/2012 [13:47 PM] LCARR, ITSI
FIGURE 9SOIL GAS WELL LOCATIONS AND TCE/PCE RESULTS
Soil Gas Boring Location##
NOTE:1) -Data results that are highlighted in red exceed Industrial and Residential Risk Screening Levels.
30 0 30
Feet
o
SAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG18-B2 5 25,000 3,400SEMSG18-B2 15 45,000 27,000
SAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG18-B3 5 30,000 2,000SEMSG18-B3 15 32,000 3,000
Phillips & Malone1439 Lidcombe Avenue, South El Monte, California
Facility Boundary
SAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG18-B1 5 2,000 310SEMSG18-B1 15 820 340
ATTACHMENT 1DRAFT SOIL GAS SAMPLING RESULTS AUGUST 2012Supplemental Remedial Investigation/Feasibility Study
San Gabriel Valley Area 1 Superfund Site - South El Monte Operable UnitLos Angeles County, California
G:\ArcGIS\EPA\S_El_Monte\PROJECTS\Soil_Gas\Tech_Memo_2012_Oct\SG_Servex.mxd 10/17/2012 [13:51 PM] LCARR, ITSI
FIGURE 10SOIL GAS WELL LOCATIONS AND TCE/PCE RESULTS
Soil Gas Boring Location##
40 0 40
Feet
o
NOTE:1) -Data results that are highlighted in red exceed Industrial and Residential Risk Screening Levels. -Data results that are highlighted in yellow exceed Residential Risk Screening Levels.
Servex Corporation9620 Klingerman Street, South El Monte, California
SAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG19-B1 5 130,000 1,300SEMSG19-B1 15 260,000 6,400SEMSG19-B1 15 (dup) 260,000 5,400
SAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG19-B2 5 87,000 290SEMSG19-B2 15 260,000 1,600
Facility Boundary
ATTACHMENT 1DRAFT SOIL GAS SAMPLING RESULTS AUGUST 2012Supplemental Remedial Investigation/Feasibility Study
San Gabriel Valley Area 1 Superfund Site - South El Monte Operable UnitLos Angeles County, California
G:\ArcGIS\EPA\S_El_Monte\PROJECTS\Soil_Gas\Tech_Memo_2012_Oct\SG_Western_Marking.mxd 10/17/2012 [13:54 PM] LCARR, ITSI
FIGURE 11SOIL GAS WELL LOCATIONS AND TCE/PCE RESULTS
Soil Gas Boring Location##
30 0 30
Feet
o
Western Markings Incorporated1930 Doreen Avenue, South El Monte, California
SAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG20-B1 5 13,000 <27SEMSG20-B1 15 21,000 62
SAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG20-B2 5 92,000 750SEMSG20-B2 15 110,000 2,000
SAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG20-B3 5 12,000 77SEMSG20-B3 15 19,000 280
NOTES:1)- Data results that are highlighted in red exceed Industrial and Residential Risk Screening Levels.
-Data results that are highlighted in yellow exceed Residential Risk Screening Levels.
2) <27 = Not detected at analytical reporting limit.
Facility Boundary
ATTACHMENT 1DRAFT SOIL GAS SAMPLING RESULTS AUGUST 2012Supplemental Remedial Investigation/Feasibility Study
San Gabriel Valley Area 1 Superfund Site - South El Monte Operable UnitLos Angeles County, California
G:\ArcGIS\EPA\S_El_Monte\PROJECTS\Soil_Gas\Tech_Memo_2012_Oct\SG_Cardinal.mxd 10/17/2012 [14:59 PM] LCARR, ITSI
FIGURE 12SOIL GAS WELL LOCATIONS AND TCE/PCE RESULTS
40 0 40
Feet
o
Cardinal Industrial Finishes1329 Potrero Avenue, South El Monte, California
SAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG21-B1 5 2,600 29SEMSG21-B1 5 (dup) 2,500 <27SEMSG21-B1 15 4,500 280
Soil Gas Boring Location##
NOTES:1) Data results that are highlighted in red exceedIndustrial and Residential Risk Screening Levels.
2) Data results that are highlighted in yellow exceedResidential Risk Screening Levels.
3) <27 = Not detected at analytical reporting limit.
Facility Boundary
SAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG21-B2 5 490 <27SEMSG21-B2 15 750 140
SAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG21-B3 5 220 <27SEMSG21-B3 15 170 <27
ATTACHMENT 1DRAFT SOIL GAS SAMPLING RESULTS AUGUST 2012Supplemental Remedial Investigation/Feasibility Study
San Gabriel Valley Area 1 Superfund Site - South El Monte Operable UnitLos Angeles County, California
G:\ArcGIS\EPA\S_El_Monte\PROJECTS\Soil_Gas\Tech_Memo_2012_Oct\SG_IMS.mxd 10/17/2012 [13:59 PM] LCARR, ITSI
FIGURE 13SOIL GAS WELL LOCATIONS AND TCE/PCE RESULTS
Soil Gas Boring Location##
30 0 30
Feet
o
NOTE:1) -Data results that are highlighted in red exceed Industrial and Residential Risk Screening Levels. -Data results that are highlighted in yellow exceed Residential Risk Screening Levels.
International Medication Systems, Limited1919 Santa Anita Avenue, South El Monte, California
Facility Boundary
SAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG22-B1 5 4,000 260SEMSG22-B1 15 39,000 5,500
SAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG22-B2 5 3,300 82SEMSG22-B2 5 (dup) 3,900 84SEMSG22-B2 15 27,000 1,800
ATTACHMENT 1DRAFT SOIL GAS SAMPLING RESULTS AUGUST 2012Supplemental Remedial Investigation/Feasibility Study
San Gabriel Valley Area 1 Superfund Site - South El Monte Operable UnitLos Angeles County, California
G:\ArcGIS\EPA\S_El_Monte\PROJECTS\Soil_Gas\Tech_Memo_2012_Oct\SG_Lets_Go.mxd 10/17/2012 [14:03 PM] LCARR, ITSI
FIGURE 14SOIL GAS WELL LOCATIONS AND TCE/PCE RESULTS
30 0 30
Feet
o
Let's Go Precision Products 1924 Doreen Avenue, South El Monte, California
Soil Gas Boring Location##
NOTE:1) -Data results that are highlighted in red exceed Industrial and Residential Risk Screening Levels. -Data results that are highlighted in yellow exceed Residential Risk Screening Levels.
Facility Boundary
SAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG23-B1 5 39,000 120SEMSG23-B1 15 74,000 1,000SEMSG23-B1 15 (dup) 78,000 990
SAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG23-B2 5 33,000 190SEMSG23-B2 15 50,000 160
ATTACHMENT 1DRAFT SOIL GAS SAMPLING RESULTS AUGUST 2012Supplemental Remedial Investigation/Feasibility Study
San Gabriel Valley Area 1 Superfund Site - South El Monte Operable UnitLos Angeles County, California
G:\ArcGIS\EPA\S_El_Monte\PROJECTS\Soil_Gas\Tech_Memo_2012_Oct\SG_PC_Drum.mxd 10/17/2012 [14:09 PM] LCARR, ITSI
FIGURE 15SOIL GAS WELL LOCATIONS AND TCE/PCE RESULTS
Pacific Coast Drum Company2200 Rosemead Boulevard, South El Monte, California
Soil Gas Boring Location##
100 0 100
Feet
o
SAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG25-B2 5 27,000 15,000SEMSG25-B2 15 89,000 28,000
SAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG25-B1 5 830 1,200SEMSG25-B1 15 370 1,500SEMSG25-B1 15 (dup) 370 1,400
NOTES:1)- Data results that are highlighted in red exceed Industrial and Residential Risk Screening Levels. -Data results that are highlighted in yellow exceed Residential Risk Screening Levels.
2) <27 = Not detected at analytical reporting limit.
Facility Boundary
SAMPLE ID DEPTH (FT) PCE (ug/m3) TCE (ug/m3)SEMSG25-B3 5 2,400 <27SEMSG25-B3 15 3,300 180
ATTACHMENT 1DRAFT SOIL GAS SAMPLING RESULTS AUGUST 2012Supplemental Remedial Investigation/Feasibility Study
San Gabriel Valley Area 1 Superfund Site - South El Monte Operable UnitLos Angeles County, California
Technical Memorandum (Continued)
Draft Soil Gas Sampling Results August 2012, Supplemental Remedial Investigation/Feasibility Study, San Gabriel Valley Area 1 Superfund Site, South El Monte Operable Unit
Draft Draft Soil Gas Sampling Results August 2012.docx Page 11 of 11
ATTACHMENT 2
Data Quality Assessment