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07 February 1996 AGE-NC Project No. 95-0162 Page 2 of 5 2.3. GROUND WATER DEPTH AND GRADIENT According to Mr. Pusphpinder Singh, property owner, ground water depth in the vicinity of the site is in excess of 120 feet. However, Mr. Ron Rowe of the PHS-EHD has stated that ground water depth near the site is more likely to be between 90 and 100 feet below surface grade (bsg). The San Joaquin County Flood Control and Water Conservation District Map Lines of Equal Depth to Water in Wells, Fall of 1993, does not indicate a ground water depth in the area of the site. 3.0. SCOPE OF WORK 3.1. DOMESTIC GROUND WATER SAMPLING The PHS-EHD has requested sampling of the domestic well on-site prior to initiation of the proposed investigation. Therefore, samples will be collected from the domestic well and transmitted to a State- certified laboratory. The sample will be analyzed for TPH-g, BTE&X and methyl tert-butyl ether (MTBE) in accordance with EPA methods 8015m, 602 and 602, respectively. If Hydrocarbon- impacted ground water is present in the domestic well, monitoring wells may be required by the PHS- EHD. 3.2. DRILLING AND SAMPLING Further investigation of the former UST area is necessary to determine the lateral and vertical extent of the hydrocarbon impacted soil and/or ground water. Initially, AGE proposes to drill four borings at the site. Three borings will be drilled vertically; one boring will be drilled at an angle of 25' from vertical under the building. Borings will be advanced to vertical depths of approximately 40 feet. If field observations indicate the presence of hydrocarbon impacted soil at 40 feet, the borings will be will be advanced to greater depths. Soil samples will be collected from each of the borings at 5-foot intervals, beginning at a depth of 5 feet bsg. These samples will be field screened for organic vapors. 3.3. EQUIPMENT DECONTAMINATION All sampling tools and brass sleeves used for sample collection will be thoroughly rinsed with clean water after washing with a solution of Alconox. All hollow stem augers are steam-cleaned prior to advancement in each borehole.