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Ham• <br /> June 25, 2056 AGS Dols No. 87048-1 <br /> Beacon Station 0675 - Lockeford, CA <br /> The relatively low levels of dissolved hydrocarbon contamination <br /> present in the soil and ground water could be considered <br /> consistant with levels of contamination introduced from minor <br /> product spills (routine customer useage) around the dispenser <br /> area, that are flushed into the dry wells. <br /> RECOMMENDATIONS <br /> We recommend that the two dry wells adjacent to Highway 88 be <br /> destroyed and that the water in the monitoring wells be sampled <br /> and analyzed quarterly for dissolved hydrocarbon contamination; <br /> and that an evaluation of the ground water usage, and background <br /> quality, in the vicinity of the site should be performed. <br /> If ground water useage warrants, or if groundwater monitoring <br /> indicates continuing or increasing introduction of hydrocarbon <br /> contamination into the ground water, the extent of ground water <br /> contamination should be further investigated by conducting either <br /> soil vapor probe analyses in the vicinity of the contamination <br /> plume, and/or by excavating two or more selectively located <br /> boreholes and installing additional ground water monitoring <br /> wells. We also recommend that a copy of this report be sent to <br /> Nfr-�-:Gorden--}3o -- :---- ------- . �--- :-- __--- -- <br /> - -- - <br /> -- — - ggs-of the-California-Regional water Qualzt Control <br /> Board, Central Valley Region, 3443 Routier Road, Sacramento, CA. <br /> A,o of ed GeoSystems <br />