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Ms. Mary Meays <br /> San Joaquin County <br /> December 6, 1994 <br /> Page 4 <br /> the tank.removal and later remedial activities are presented in Table 3. The analytical J <br /> results for sampling conducted during the well construction and-earlier hydropunch -. <br /> sampling are tabulated on Table 1 of the well installation report presented in Attachment <br /> D. The analytical results for the soil stockpile sampling conducted during the tank <br /> removal activities are tabulated:on Table 4. <br /> S. , ""Vertical and lateral concentration contours of contaminants found initially, <br /> and-those remaming-in-soil and groundwater, both on and off site" <br /> 1 <br /> As iridicated by-tl; .-analytical<rest,ts presentee in Tables�l'-ai d-3;sub'segiierit to the <br /> remedial activities conducted immediately after the tank removal (see item 7), no <br /> contaminants were detected in:'the soil nor in the groundwater monitoring conducted-.in <br /> the last three quarters. Therefore; this information is not applicable to this site. <br /> 6. "Mass balance calculation of the substance-treated versus that remaining" <br /> As indicated by the analytical results-presented,in'Tables 1-and 3, no contaminants were <br /> detected in soil samples:collected subsequent to:overexcavating the tank pit nor in <br /> groundwater monitoring conducted in the last- hiee quarters.- Therefore, this requirement <br /> is not applicable to this site since th6 data indicates that there are no contaminants <br /> remaining, <br /> 7. "Technology used to_cleanahe-site <br /> During the initial tank removal activities'conducted in.June 1992, a total of approximately <br /> 160_ tons of hydrocarbon affected�soil-was excavated;.removed from the site, and disposed. <br /> of Approximately 1,500'gallons of groundwater,were also evacuated and removed from <br /> the site. Within the next nearly two years, as indicated by the groundwater monitoring <br /> data.collected over the,last three nuar;:err am re�ryairirg trace•:levels_of petroleLim — - <br /> hydrocarbons in the groundwater were degraded by naturally occurring biological <br /> activities. <br /> S. "Zone of influence calculated for-the subsurface remediation system and the ; <br /> zone of capture attained-for the soil-and groundwater remediation system" <br /> No groundwater-remediation system was constructed at this site. <br /> 4. "Reasons why" <br /> backgrdund''.':waslis unattainable" <br /> No contaminants of concern,.were detected during monitoring conducted over,the last <br /> three quarters. 'Background"-was attained.. - <br /> - 1 <br />