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$�r:.F`�S d".F[i�; 'YM'r: '`� ��.3"'£�1�.� .P 'w•-x- �$. ���7: .� l�i7i �. rW� t WY �. - � ,'.q' <br /> E ' <br /> Quarterly Ground-Water Monitoring March 8, 1989 <br /> Beacon Station No. 3-492, Manteca, California AGS 86142-3 <br /> Iw <br /> Because free product was detected in well MW-1 during the <br /> September 1988 quarterly monitoring, Applied Geosystems <br /> recommended that Beacon attempt to evaluate the source. it is <br /> our understanding, based on discussions with personnel of Beacon, <br /> that potential sources have been evaluated and no recent releases <br /> Of petroleum product are known to have occurred at the site. The <br /> free product observed in well MW-1, therefore, is probably due to <br /> residual contamination. Applied GeoSystems recommends that <br /> subjective analyses continue to be performed on a monthly basis. <br /> If free product continues to be present in the well, delineation <br /> and active remediation may be necessary. As an interim remedial <br /> response, removal of free product by bailing should be continued. <br /> We also recommend that the vapor-extraction system be <br /> implemented, and its effectiveness in reducing contaminant <br /> concentrations in soil and ground-water be evaluated. <br /> i <br /> - 5 <br /> y <br /> s _ 4 <br /> S wr <br /> . PPIled GeoSyelems <br />