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COPY <br /> Applied GeOSystems 4191-E Power inn Road, Sacramento, CA 95826 (916) 452-2901 <br /> • FREMONT • COSTA MESA • SACRAMENTO • HOUSTON <br /> � 47048-1 <br /> APS ?, , . <br /> Mr. Robert Phillips HALON <br /> Sharibo <br /> 11490Ab ine Road ��1V1ROE`�SERvt�LS <br /> p <br /> Stockton, California 95212 <br /> Subject: Transmittal of Report No. 87048-1, Subsurface <br /> Environmental Investigation, Soil Boring and <br /> Monitoring Well Installation at Beacon Station, <br /> #675 , 13975 East Highway 88, Lockeford, California <br /> Mr. Phillips : <br /> This report presents our findings from the environmental <br /> investigation conducted at the above-referenced site. The <br /> purpose of the investigation was to evaluate potential <br /> hydrocarbon contamination of subsurface soil and ground water at <br /> the site. The investigation included the drilling of four soil <br /> borings, installation of four 2-inch diameter groundwater <br /> monitoring wells, well development and surveying, ground water <br /> sampling, and laboratory analyses. <br /> This investigation indicates that ground water beneath the site <br /> has hydrocarbon contamination that is not within generally <br /> accepted drinking water standards recommended by the State <br /> Department of Health Services. Two, open dry wells are located <br /> in catch basins adjacent to Highway 88. These dry wells act as <br /> drains for runoff (wash-downs, rain, product spills, etc. ) from <br /> the product dispenser area and provide a conduit for the <br /> introduction of hydrocarbons into the soil and ground water. We <br /> recommend that the dry wells be destroyed. We also recommend <br /> that water in the ground water monitoring wells be sampled and <br /> analyzed quarterly for dissolved hydrocarbon contamination to <br /> evaluate contaminate trends. <br /> In our opinion, if ground water useage warrants, or if ground <br /> water monitoring indicates the continuing or increasing <br /> introduction of hydrocarbon contamination into the ground water, <br /> the extent of ground water contamination should be further <br /> investigated by conducting a soil vapor investigation and/or by <br /> excavating selectively located boreholes and installing <br /> additional ground water monitoring wells. <br />