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l <br /> `Interim Report Covering Results of Site Investigation;Placement of Soil Water Probes... " <br /> dated Sepember 28, 1998 for complete details of that work. <br /> CONCLUSIONS: <br /> 1. The vertical limits of soil & groundwater contamination have been well delineated. <br /> 2. Soil contamination exists beneath the southeast corner of the office& shop building, <br /> and an unknown distance to the north along the driveway on the east side of the <br /> property. <br /> 3. The highest levels of groundwater contaminants have been measured in MW-1, which is <br /> located closest to, and downgradient from, the removed UST's. <br /> 4. The water table has fluctuated from an average depth of 6.39'bgl to 9.12'bgl, and has <br /> always been below the tops of the well screens, which are at 5'below grade. <br /> 5. MW-1 has consistently measured the highest levels of contaminants in the groundwater. <br /> 6. MW-2 has been below detection limits in the 7 sampling events since December, 1995. <br /> 7. The levels ofBTEX& TPHg in MW-3 show a decrease with time, suggesting that bio- <br /> re d' ccurrmg, since there is no evidence that the plume is migrating down- <br /> gradient. <br /> RECOMMENDATIONS: <br /> J�wt <br /> Based upon the evidence obtained to date, we do not believe that additional investigative 0%t ;h 4�� <br /> work is required, and recommend the installation of ORC material in MW-1 to reduce the t' c <br /> levels of contamination to minimum levels. Air-sparging/soil vapor extraction is not feaible <br /> because of the shallow water table, and additional soil cannot be excavated due to the <br /> proximity of the building, an electrical transformer, and a large California Water Service <br /> water line which traverses the site in the middle of the driveway on the east side of the <br /> building. We believe this is a"low risk" site, and large expenditures of Cleanup Fund <br /> monies are not warranted. Your prompt review and response to this report will be greatly <br /> appreci ted. <br /> W <br /> »x . Hunter&Associates �5:S iQED GE�l p <br /> c- alley Wholesale Drug Co. WiL <br /> Mark List, RWQCB , ��'�;�iv j <br /> N0.660 <br /> 2 sT9�OF CALIF��� <br />