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ARCHIVED REPORTS FINAL SITE INVESTIGATION
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ARCHIVED REPORTS FINAL SITE INVESTIGATION
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Last modified
10/24/2018 3:21:55 PM
Creation date
10/24/2018 11:39:10 AM
Metadata
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Template:
EHD - Public
ProgramCode
2900 - Site Mitigation Program
File Section
ARCHIVED REPORTS FINAL SITE INVESTIGATION
FileName_PostFix
FINAL SITE INVESTIGATION
RECORD_ID
PR0526994
PE
2957
FACILITY_ID
FA0018291
FACILITY_NAME
FMS #24 (OMS)
STREET_NUMBER
8010
Direction
S
STREET_NAME
AIRPORT
STREET_TYPE
WAY
City
STOCKTON
Zip
95206
APN
17726029
CURRENT_STATUS
01
SITE_LOCATION
8010 S AIRPORT WAY
P_LOCATION
99
P_DISTRICT
001
QC Status
Approved
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FMS #24 Site Investigation Report <br />California Army National Guard <br />3.3 URS May 2007 Site Investigation <br />3.3.1 The site investigation conducted by URS in May 2007 included the collection of soil, soil gas, <br />and groundwater samples for analysis from five HSA borings at the site (FMS24SB01 through <br />FMS24SB05). Borings were placed in and around the former location of two USTs (one 10,000 - <br />gallon gasoline and one 5,000 -gallon diesel) and associated piping. Soil, soil gas, and groundwater <br />samples were taken from the five boring locations and analyzed for TPH (diesel and gasoline) by <br />EPA Method SW8015, VOCs (including MtBE/BTEX/oxygenates) by EPA Method SW8260B, and <br />metals by EPA Method SW6010B. Borings were drilled to first groundwater encountered (approxi- <br />mately 40 to 45 feet bgs). In addition, four shallow (5 feet bgs) hand augers (FMS24HA01 through <br />FMS24HA04) were drilled and sampled for metals analysis: three locations were placed around the <br />former USTs, and one location was placed in an area away from the site investigation to be used as a <br />background sample for comparison to the data collected at the former USTs. Metals data show no <br />elevated concentrations encountered in the three locations near the USTs. Sample collection proce- <br />dures followed protocols described in the work plan for this effort (URS, 2006). Based on the results <br />of the May 2007 investigation, sampling and analysis of additional soil borings was recommended to <br />further evaluate the extent of contamination (see October 2007 investigation, Section 3.4). Figures <br />3-6, 3-7, 3-8, and 3-9 show a geologic cross section of the site, soil gas results, soil results, and <br />groundwater results, respectively, from the URS investigations. Boring logs are presented in <br />Appendix C. Analytical data are presented in Appendix D. <br />3.3.2 Soil samples were also collected at depths of 20, 30, and 40 feet bgs in each of the five <br />borings (see Tables 3-3A, 3-3B, and 3-3C). Figure 3-7 shows the results for TPHG, TPHD, total <br />xylenes, and benzene. VOC and BTEX concentrations generally increased with depth, with the 40 - <br />foot sample having the highest concentrations (likely due to affects of groundwater contamination; <br />i.e., groundwater was at approximately 40 to 45 feet bgs). BTEX and TPH compounds were detected <br />in each boring, with maximum concentrations detected as follows: <br />• Benzene was detected at 5.5 mg/kg at 40 feet bgs in boring FMS24SB01 (PRG is 0.64 mg/kg). <br />• Toluene was detected at 9.2 mg/kg at 39 feet bgs in boring FMS24SB04 (PRG is 520 mg/kg). <br />• Ethylbenzene was detected at 24 mg/kg at 39 feet bgs in boring FMS24SB04 (PRG is <br />400 mg/kg). <br />• Total xylenes were detected at 140 mg/kg at 39 feet bgs in boring FMS24SB04 (PRG is <br />270 mg/kg). <br />• TPHD was detected at 8,000 mg/kg at 5 feet bgs in boring FMS24HA03 (no PRG for TPHD) <br />• TPHG was detected at 1,600 at 39 feet bgs in boring FMS24SB04 (no PRG for TPHG). <br />3.3.3 Soil gas results from samples collected at approximately 20, 30, and 40 feet bgs from each <br />boring (analyzed by EPA Method TO -14 for VOCs) showed the presence of BTEX, in addition to a <br />number of other VOCs detected at lesser concentrations (see Tables 3-4 and 3-5 and Figure 3-8). In <br />two of the borings, FMS24SB04 and FMS24SB05, the 40 -foot sample was not able to be collected <br />due to water -saturated soils. Maximum BTEX concentrations in samples collected from the five <br />borings were all in the sample collected at 40 feet bgs in boring FMS24SB03, as follows: <br />• Benzene was detected at 250,000 parts per billion by volume (ppbv). <br />December 2007 <br />
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