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1 1.0 INTRODUCTION •1 USA Petroleum Corporation (USA) has retained Park Environmental Corporation rporation (Park) to represent USA in matters pertaining to environmental issues at Station#110 located at 2132 East Manposa Road, Stockton, California as shown on Figure 1 Mr Srnkanth Dasappa of USA has ' authorized Park to prepare this report of well construction at the subject site San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD)is the environmental lead agency for the site The PHS/EHD Site Code is#1669 1.2 Facility Description The USA service station is located on the southeast corner of the intersection of East Manposa Road and Farmington Road in Stockton, California, as shown on Figure 1 The station has three ' 12,000-gallon gasoline tanks and one 3,000-gallon diesel fuel tank, as shown on Figure 2 The tanks appear to be located in the same tank pit on the Manposa Road side of the property 2.0 Background ' 2.1 Site History Three phases of site assessment have been performed at this facility The first, as part of a pre- purchase due diligence by Pacific Environmental Group,a Preliminary Site Assessment Investigation report was prepared on March 16, 1987 This report consisted of the drilling and sampling of four soil boring, one of which was completed as a groundwater monitoring well Groundwater was present at about 45-feet below ground surface (bgs) Soil sample analyses from these borings indicated that there were total petroleum hydrocarbons (TPH) and benzene, toluene, ethylbenzene and xylenes (BTEX) constituents present in shallow soils and soils dust above the water table One groundwater sample contained BTEX compounds above state action levels (SAL) The presence of petroleum hydrocarbon compounds in the soil and groundwater beneath the site prompted a second site assessment conducted by Applied Geo Systems (AGS), presented on October 7, 1987 This second phase of groundwater sample analyses from these wells confirmed Ithat TPH compounds were present in the groundwater beneath the site The direction of groundwater movement was calculated to be in a northwesterly direction As a result of these findings PHS/EHD requested that a quarterly groundwater monitoring program be initiated for this location,plus a request that all domestic groundwater wells be identified and sampled Six domestic wells were located and sampled Test results presented in a May 13, 1987 letter report prepared by AGS were non-detect for TPH and BTEX The next quarterly sampling could not be performed because the groundwater table had declined below the ' bottom of the morutoring wells In the third phase, Park was retained to install three new groundwater monitoring wells that would extend to the water table Park also installed a single, shallow vapor extraction well The wells were completed in September, 1992 Park also performed quarterly groundwater sampling and a vapor extraction treatability study