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reporting limits ' On 0 1 9 based upon PHS-EHD direction, AGE submitted an addendum to the 2 June 99 p aforementioned work plan to remove dispenser island/associated piping and perform soil sampling prior to in-place abandonment of the USTs IOn 18 June 1999, AGE decontatninated and removed the product piping and advanced angled soil probe borings for soil sampling prior to UST abandonment and product piping removal Two soil I samples,SB-1-20'and SB-2-20'were collected approximately 20 feet below surface grade(bsg)near the bottom of the USTs and five soil samples were collected beneath the piping at an approximate depth of 2-3'bsg extending from the dispenser island to the USTs and are identified as P-1,P-2,P-3, P-4,and P-5 TPH-g,BTEX,and lead were reported detected through laboratory analysis in the soil samples collected from soil borings SB-1 and SB-2 at maximum concentrations of 760 mg/kg TPH- g, 112 µg/kg benzene�2,370 pg/kg toluene,1,230 µg/kg ethyl-benzene, 2,510 µg/kg total xylenes- and 6 0 mg/kg lead'TPH-g,Toluene,Ethyl-benzene,total xylenes and lead were reported in the soil samples collected from locations P-1 through P-5 at maximum concentrations 6,400 mg/kg TPH-g, 43 µg/kg toluene;600 µg/kg ethyl-benzen44,360 n/kg total xylenes and 610 mg/kg lead / Du field decisions made b AGE and PHS-EHD on Jul 9 1999 AGE removed 3 aviation Due to e d y , y , gasoline USTs (Tanks #39-1808-01, 5,000 gallon storage capacity, #39-1808-02, 4,000 gallon capacity, #39-1808-03, 4,000 gallon capacity) from the site instead of in-place abandonment The tanks were certified to be properly cleaned and free of hydrocarbon residue by EHD and transported Ile off the site by West Coast Equipment of Turlock, California TPH-g, BTEX,MTBE and lead were reported detected through laboratory analysis in soil samples collected from the former UST pit at maximum concentrations of 103 mg/kg TPHg, 74 gg/kg benzene,1,093 µg/kg toluene;443 pg/kg ethyl-benzene;2,182 µi&g total xylenes, 27 pg/kg MTBE and 324 mg/kg lead Lead was the only constituent of concern reported detected in the stockpiles and dispenser locations at a maximum concentration of 35 mg/kg On 18 November 1999,PHS-EHD placed the site in their Local Oversight Program and required a work plan be submitted to investigate contamination at the site On 23 February 2000, GE performed a preliminary site assessment to i vesthgate a suspected unauthorized release of pe oleum hydrocarbons to soil an ground water at t -rte The laboratory ' results of analyses of samples onfirmed the presence of ape oleum hydrocarb -impact to soil and ground water in the former US area The San Joaquin Cour Environmental alth Department (EHD) subsequently required an 1 vestigation to determine the xtent of petroleu hydrocarbon- impact to soil and ground water On 21 and 22 June 2000,three ground water monitoring wells were installed (MW-1 through MW- 3)to 85 feet below surface grade Quarterly ground water monitoring was initiated on 05 July 2000 and continued through 31 May 2002 ' On 12 December 2001, two soil borings (B-5 and B-6) were advanced at the site using a CME-75 high-torque drill rig Soil boring procedures were performed as outlined in the AGE-prepared Work Plan Addendum -June 2001, and as approved by the EHD by letter dated 12 June 2001 I I