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- _ <br /> � <br /> y. September. 14, 1988 <br /> AGS Job No. 86102-3 <br /> Page 3 <br /> well MW-1 also exceeded the recommended levels established by <br /> that agency, as did the toluene concentration in the sample from <br /> well MW-2. <br /> W <br /> Because the concentrations of some volatile constituents in the <br /> ground-water samples collected at the site exceed the maximum <br /> levels for drinking water recommended by the DHS, we recommend <br /> that a vapor recovery system be implemented to mitigate soil <br /> contamination in the vicinity of the tank cavity. If contaminant <br /> ? , concentrations in ground water underlying the site remain above <br /> recommended levels additional work may be necessary to evaluate <br /> the source of ground-water contamination at the site. Mitigation <br /> of ground-water contamination at the site should not proceed, <br /> however, until the effectiveness of the vapor-recovery system can <br /> be evaluated. The quarterly ground-water monitoring program <br /> should be continued. <br /> Copies of this report should be forwarded to IIs. Laurie Cotulla <br /> of the San Joaquin County Local Health District, Environmental <br /> Health Division, 1601 Hazelton Avenue, P.O. Box 2009, Stockton, <br /> California 95201, and to Mr. Gordon Lee Boggs of the California <br /> Regional Water Quality Control Board, central Valley Region, 3443 <br /> ' Routier Road, Sacramento, California 95827-3098. <br /> ! We have tentatively scheduled the next sampling event for the <br /> 6 week of September 5, 1988. Please. do not hesitate to call if you <br /> have any questions concerning this project. <br /> F <br /> Sincerely, <br /> E <br /> Applied <br /> GeoSystems <br /> J. B. Babbitt <br /> c R. G. 4313 <br /> ! Attachments: Table 1, Cumulative Results of Subjective Analyses <br /> Table 2, Cumulative Results of Laboratory Analyses <br /> ' Plate P-1, Site Vicinity Map <br /> Plate P-2, Generalized Site Plan <br /> Chain of Custody_Record <br /> _._..-- -. - --- - - -- - .. ----- — -- ---- <br /> Laboratory Analysis Reports (3) <br /> f� <br /> fav/®/hd <br /> 000Systems <br />