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Ms. Margaret Lagorio <br /> San Joaquin County <br /> July 24, 1995 <br /> Page 4 <br /> one location near the fence line. Soil samples will be analyzed for TPH with <br /> characterization of peaks and CAM 5 metals. <br /> If PID readings or visual evidence indicates the presence of impacted material, <br /> additional soil gas, soil, and/or groundwater samples will be collected to estimate <br /> volume of impacted material. <br /> Washdown Pad Area/Northern Perimeter <br /> New and used equipment is cleaned on a concrete pad in the northwest corner of the <br /> property using acid and basic pastes and water. Wash water drains off the pad and <br /> onto an area of deteriorated and broken asphalt. Two diesel USTs and a fuel <br /> dispenser island are located north of this area on an adjacent parcel. <br /> To evaluate potential impact to soil from the nearby USTs, a soil gas sample will be <br /> collected from one location at the low point adjacent to the concrete washdown pad <br /> and near the northern fence line. The soil gas sample will be field screened with a <br /> PID. <br /> To evaluate potential impact to groundwater from the nearby USTs, the soil boring will <br /> be deepened and one groundwater sample will be collected using the Hydropunch <br /> technique. The groundwater sample will be analyzed for TPH with characterization of <br /> peaks and VOCs. <br /> To evaluate potential impact to shallow soils of washdown activities, one soil sample <br /> will be collected from a location adjacent to the soil gas sample location. The soil <br /> sample will be analyzed for TPH with characterization of peaks and CAM 5 metals. <br /> Unpaved Storage Yard <br /> Parts and equipment are being stored in this area and approximately five to seven <br /> areas of oil-stained surface soil are present. Fifty-five gallon drums of lubricating oils, <br /> hydraulic fluids, and solvents are stored on pallets without secondary containment. <br /> Soil gas samples will be collected from 4 locations and will be field screened with a <br /> PID. Two of the soil gas sample locations will be in stained areas and the other two <br /> in random locations within the storage area. <br /> Soil samples will be collected from ten locations at the one- and five-foot depths using <br /> a Geoprobe system. Approximately half of the soil samples will be collected from <br /> visibly stained locations and the other half at random locations within the storage area. <br /> WINHYDRO-SEARCH, nG A Tetra Tech company <br />