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Mr Chuck Carmel <br />. March 10, 1994 <br /> Page 3 <br /> On November 9, 1993, wells MW-1, MW-2, and all other groundwater monitoring wells were <br /> monitored and sampled by EMCON The results of the groundwater sampling are presented <br /> in BC's fourth quarter 1993 report for this site <br /> Results <br /> The 18 borehole and one stockpile composite soil samples were submitted to Sequoia <br /> Analytical Laboratory in Sacramento under chain-of-custody Table 2 presents the analytical <br /> data for this and previous soil sampling events at the site A complete laboratory report is <br /> included as Appendix C of this report <br /> Figures 1, 2, and 3 present the soil analytical data at approximately 5, 10, and 15 feet below <br /> ground surface, respectively Based on the results of the well installation and previous <br /> investigations, including the removal of the product recovery tank (near the recovery well) and <br /> the installation of the waste oil tank (on the west side of the building), the soil in the areas <br /> of the underground storage tank (UST) complex/former recovery tank and on the southern and <br /> southwestern portions of the site, have been affected by hydrocarbons In addition, <br /> hydrocarbons have been identified on the northeast portion of the site The highest <br /> hydrocarbon concentrations occur in the UST complex/former recovery tank area <br /> Conclusions <br /> During this and previous soil sampling events at this site, hydrocarbons have been identified <br /> in the soil near the UST complex and former product recovery area as well as the southern, <br /> southwestern, and northeastern portions of the site <br /> Based on a vapor extraction pilot study conducted by BC in February 1992, and the site <br /> lithology, vapor extraction is a viable remedial option for this siteBased on the results of <br /> the soil and groundwater samples collected to date, additional soil va or extraction and air <br /> sparging wells will be required on the southern and northeastern onion of the site <br /> Use or disclosure of data contained on this sheet is subject to the restriction specified at the beginning of this <br /> document 03/t0/94\7690V.E. TSSWE1J-1NST.R" <br />