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' In July 1993, a subsurface investigation was conducted at the site by AquaGeosciences Inc. to <br /> determine the extent of petroleum hydrocarbons present in soil and to determine if groundwater <br /> ' had been impacted This included drilling eight soil borings and collecting soil samples Three <br /> of these borings were completed as shallow groundwater monitoring wells (MW-1, MW-2 and <br /> MW-3) Analysis of soil samples indicated that the majority of petroleum hydrocarbons in soil <br /> were present from about 10 feet below ground surface (bgs) to groundwater at a depth of <br /> approximately 29 feet bgs and within a radius of 35 feet from the former UST pit. Soil <br /> ' analytical results are presented in Table I <br /> ' In August 1993, wells MW-1, MW-2, and MW-3 were monitored and sampled by <br /> AquaGeosciences Inc Analytical results showed that MW-I contained no measurable <br /> ' concentrations of petroleum hydrocarbons in the groundwater Wells MW-2 and MW-3 <br /> contained detectable levels of petroleum hydrocarbons <br /> As requested b San <br /> eq y Joaquin County Public Health Services/Environmental Health Division <br /> ' (PHS/EHD), groundwater samples were collected quarterly by Smith Environmental, formerly <br /> RESNA Industries, Inc , from three shallow monitoring wells (MW-1, MW-2 and MW-3) from <br /> ' March 1994 through March 1995 Analytical results showed that MWA histoncally has <br /> contained no measurable concentrations of petroleum hydrocarbons in the groundwater Well <br /> MW-2 contained low levels of petroleum hydrocarbons but has decreased to nondetect in March <br /> 1995 MW-3 contained detectable concentrations of petroleum hydrocarbons The locations of <br /> ' the monitonng wells are shown on Figure 2 Monitoring data and groundwater analytical results <br /> are containers in Tables 2 and 3, respectively <br /> SCOPE OF SITE INVESTIGATION AND QUARTERLY MONITORING <br /> ' The work performed for this investigation included locating underground utilities, obtaining <br /> permits from the PHS/EHD, drilling three soil borings, installing, surveying and developing <br /> three monitoring wells, and analyzing selected soil samples and groundwater samples The <br /> purpose of this work was to further define the lateral and vertical extent of petroleum <br /> hydrocarbon contamination in the soil and groundwater All drilling activities were performed <br /> • <br /> �WFN <br /> 1 <br />