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• Results of Confirmation Sod Boring,Domestic Well Sampling And Closure Request Moore Petroleum,Inc, 14800 West Frontage Road,Manteca,California Page 2 In early 1995, Emcon installed a soil vapor extraction system consisting of a Remediation Service, Int'l Spray Aeration Vapor Extraction (S A V E ) system at the subject site The vapor extraction system was installed per San Joaquin Valley Unified Air Pollution Control District (SJVUAPCD) permit conditions The vapor extraction system consisted of an internal combustion engine with catalytic converters mounted on the exhaust pipe To date, the vapor extraction system has extracted approximately 2,390 lbs of TPH, as gasoline, and 7 8 lbs of berizene On January 23, 1995, Emcon started a groundwater treatment system at the subject site The groundwater treatment system was pneumatically operated via compressed air supplied from the R S I unit and extracted groundwater from monitoring wells MW-1, MW-2, MW-3 and MW-4 Once the groundwater arrived in the remediation compound via V diameter PVC piping, it was filtered through two in-line particulate filters and then through two in-line, 400 lb carbon vessels Upon discharging from the carbon vessels, it was re-injected through two re-injection wells, RW-1 and RW-2, located to the west of the remediation compound (Figure 2) To date, the water treatment system has extracted 18 pounds (lbs ) of TPH, as gasoline, and 0 37 lbs of benzene On November 27, 1996, Moore Petroleum received a letter from San Joaquin County Environmental Health Division (County) giving their approval to shut down the groundwater • treatment system and the vapor extraction system due to low system influent concentrations RESULTS OF CONFIRMATION SOIL BORING On August 29, 1997, Apex personnel supervised the drilling of four soil borings (VB-1 through VB-4) at the site (Figure 2) The purpose of the four soil borings was to verify the absence of TPH, as gasoline, TPH, as diesel, BTEX, 1,2-dichloroethane and MTBE The soil borings were drilled to a depth of 25 feet below ground surface (bgs) Soil samples were collected at various depths, and submitted under chain-of-custody (COC) documentation, to Sparger Technology, Inc (Sparger), a state-certified laboratory All samples were collected in accordance with the Apex Standard Operating Procedures (SOP) included in Appendix A The soil samples were analyzed for above-mentioned constituents by EPA Methods 8020, 8015, 601 and 8260, respectively A representative of the County was on site during the drilling and sampling of VB-1 through VB-4 The County representative and Apex personnel determined which soil samples be submitted for analyses Samples were chosen based on field screening, odor and proximity to the UST and product lines The laboratory analytical results indicate that petroleum hydrocarbon concentrations were below standard lab detection limits in all soil samples analyzed, except sample VB-2-25, which had 0 0017 ppm of 1,2-dichloroethane The soil sample analytical results are summarized in Table 1 Soil X boring logs are included in Figures 3 through 6 " 1 t 2--'�-V�A U • Soil samples VB-4-15 and VB-4-25 were not analyzed due to lab error Samples VB-4-I5 and JY D 1_PROJECTIE'STRA02 009\Results0997\ResultsReport doc