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AA0,01lo ' Geo43255 Mission Blvd. Suite B Fremont,4A 94539 (415)651-1906 <br /> July 13, 1987 <br /> 87048-1 <br /> Mr. Robert Phillips <br /> Sharibob Inc. <br /> 11490 Alpine Road <br /> Stockton, Cali€orDia 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 /> y' investigation conducted at the above-referenced site. The <br /> purpose of the investigation was. to evaluate potentia] <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 'tour 2-inch diameter groundwater <br /> monitoring wells, well development and surveying, groundwater <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 adiacent 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. n 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 :ells. <br />