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• August 19, 1988 <br /> AGS Job No. 86091-6 <br /> Page 3 <br /> concentration in the sample collected from Well MW-5 was below <br /> the detection limit of the analytical method used; the <br /> concentrations of the other volatile constituents have increased <br /> but were below the maximum levels for drinking water recommended <br /> by the DHS. The concentrations of all volatile constituents in <br /> the 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 /> A until the effectiveness of the vapor-recovery system can be <br /> evaluated. <br /> Copies of this report should be forwarded to Ms. Laurie Cotulla <br /> of the San Joaquin County Local Health District, Environmental <br /> Health Division, 1601 Hazelton Avenue, P.O. Box 2009, Stockton, <br /> Ay• 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 /> jT <br /> John Bazley Bobbitt <br /> J 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 (5) <br /> i� <br />