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AddMonal Subsurface Investigation And Well Installation Report 2 The Southland Corporation,Store#19976,1399 N Main St Manteca California November 15 1998 On September 20, 1996, a total of seven soil samples were collected from the floor of the additional tank pit excavation sic samples at 13 feet BGS and one sample at 15 feet BGS Soli samples were collected ' using the same protocol and analyzed for the same parameters as the samples collected beneath the USTS In February of 1998, SJCPHS required a work plan for further subsurface investigation of the vertical and lateral extent of contamination at this site OnAp nl 29, q 1998 to fulfill the requirements of the SJCPHS, Fluor Daniel GTI supennsed the ' advancement of three geoprobe points (GP-1 through GP-3) near the underground storage tank(UST) pad and pump Island (Figure 2) Using a truck-mounted hydraulic dnll and direct push techniques, discrete soil samples were collected from each of the soil borings Soil samples were collected at 5- foot intervals beginning at 5 feet below grade ' A total of 19 sod samples were submitted for laboratory analysis for BTEX, MTBE, and TPH-G using EPA methods 8020/modified 8015 One sample from each sod boring was also analyzed for the oxygenates, MTBE,tert-butanol (TBA),ditsopropyl ether(DIPE), ethyl-tert-butyl ether(ETRE), and tert amylmethyl ether(TAME) using EPA method 8260 Table 1 summanzes the laboratory analytical results for the sod samples collected from the three sod ' bonngs drilled April 29, 1998 The highest concentrations of benzene, MTBE and TPH-G were reported in sample GP-3-35 at 15 milligrams per kilogram (mg/kg), 27 mg/kg and 2,600 mg/kg, respectively MTBE,TBA, DIPS, ETBE,and TAME, using EPA method 8260 were not detected in the three samples analyzed Soil samples taken from the UST pit and soil bonngs indicate the dissolved hydrocarbon ' source area Is between the pump island and former UST pit Following completion of the borings,grab groundwater samples were collected from soil bonngs GP-1, ' GP-2, and GP-3 using disposable bailers, then decanted into 40-milliliter glass vials treated with hydrochloric acid to preserve the samples The samples were sealed using Teflon septum caps, labeled, placed on ice in an insulated container, and transported under chain-of-custody manifest to ' Core Laboratory The groundwater samples were analyzed for BTEX, MTBE,and TPH-G, using EPA methods 8020/modified 8015, and for oxygenates MTBE,TBA, DIPE, ETBE, and TAME using EPA method 8260 1 ' 18078asr rpt � FLUOR DANIEL GTI