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r <br /> i <br /> August 19, 1988 <br /> AGS Job No. 86091-6 <br /> Page 3 <br /> Fwere <br /> the sample collected f;om well MW-5 was below <br /> mit of the analytical method used, the <br /> f the other volatile constituents have increased <br /> he maximum levels for drinking water recommended <br /> by the DHS. The concentrations of all volatile constituents in <br /> -he sample collected from well MW-3 are below the maximum levels <br /> recommended by the DHS. <br /> Applied GeoSystems recommends continued.ground-water monitoring <br /> of this site on a quarterly basis. Because of the concentrations <br /> Of some volatile constituents, we also recommend that a vapor- <br /> recovery system be implemented to mitigate soil contamination in <br /> the vicinity of the tank cavity. A vapor-recovery system should <br /> reduce the concentration of the volatile hydrocarbon contaminants <br /> in the soil adjacent to the tank cavity, and may reduce the <br /> existing contaminant concentrations in ground water. Mitigation <br /> of..ground-water contamination at the site should not proceed <br /> until the effectiveness of the vapor-recovery system can be <br /> evaluated. <br /> Copies of this report should be forwarded to Ms. Laurie Catulla <br /> of the San Joaquin County Local Health District, Env:*ronmental <br /> Health Division, 1601 Hazelton Avenue, P.O. Box 2009, Stockton, <br /> California 95201 and Mr. Gordon Lee Boggs of:the California <br /> Regional Water Quality Control Board, Central Valley Region, 3443 <br /> Routier Road, Sacramento California, 95827-3098. Please do not <br /> hesitate to call if you have any questions regarding this <br /> project. <br /> Sincerely, <br /> Ap lied GeoSystems <br /> John Bailey Bobbitt <br /> R.G. 4313 <br /> ` Attachments: Plate P-1, Site Vicinity Map <br /> Plate P-2, Generalized Site Plan <br /> Table 1, Cumulative Results of Subjective Analyses <br /> Table 2, Cumulative Results of Laboratory Analyses___________ <br /> Chain of .Custody Record <br /> Laboratory Analysis Reports f5} <br /> .4wlied GeoSystems <br />