SITE INFORMATION AND CORRESPONDENCE

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.� -Lr-1r lU14 aRUvr ILL NU ..)1U b�P5 rb6r Npr 2e ,95 12 = 19 P .05 Ms. Mast'Meays Sart Joaquin County December G, 1994 Page 4 the tank removal and later remedial activities are presented in Table 3. The analytical results for sampling conducted during,the well construction and earlier hydrrpunrh sampling are tabulated on Table l of the well instsllation report presented in Attachment D. The analytical results for the soil stockpile sampling conducted during the tank removal activities are tabulated on Table 4. S, "Vertieal and lateral concentration iCuiltoum of rurttanriknants found initially, and those remaining in soil and groundwater, both on and oirsite" As indicated by the analytical results pncsentcd in Tables l and 3, subsequent to the remedial activities conducted immediately after the tank removal(sm item 7), no contaminants were detected in the soil nor in the groundwater monitoring conducted in the last three quarters. Therefore, this ivrormation is not applicable to this site. G. "Mass balance calculation orthe subsance treated versus that ronaitxing" As indicated by the analytical results presented in Tables l and 3, no conteminwits were detected in soil samples collected subsequent to overexcavating the tank pit nor in groundwater monitoring conducted in the last three quaners_ Therefore, this requirement is not applicable to this site sincc the data indicates that there are no uintamironts remaining. 7. "Teclunology used to clean the site" During the initial tank removal activities conducted in June 1992, a total of approximately 160 tons of hydrocarbon-aff tcxl sail was excavated, removed fYom the site, and disposed of Approximately 1,500 gallons ofgmundwater were also evacuated and reinovcd from the site. Within the next nearly two years, as indicated by the groundwater Mnitaring data colleaed over the last three quarters, any remaining trade levels of petroleum hydrocad5ons in the groundwater were degraded by naturally oacurring biological activities. 8. "lone of influence calculato for tht subsurrace remediation system and the zone of capture atlained for the soil and givandwater reirediation system" No groundwater remediation system wa%constructed at this site. 9. "Reasons why "background" was/is unattainable" No contaminants of concern were detected during monitoring conducted over the last three quarters "Background"was Attained.