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16200 McKinley Av.,Lathrop, CA AN Project#9479 August 3,2003 Page 3 C57 licensed drilling contractor. A drilling permit will be obtained from SJCEHD. The borings will be advanced to a maximum depth of approximately 20 feet bgs as needed to collect groundwater samples. Soil will be continuously cored in each boring. Cores will be retained in 1.5" diameter acrylic liners. Soil samples will be cut from the liners at approximately 4-foot intervals and retained for possible chemical analyses. Field screening will be done at regular 4-foot intervals and as determined by the onsite geologist. Based on field observations and organic vapor measurements collected in the field, additional samples may be retained at the discretion of the onsite geologist. Groundwater samples will be collected from each boring inserted through the direct push rods or through temporary slotted PVC casing placed in the boring. Water samples will collected using a bailer or a drop tube equipped with a check valve on the bottom. Following collection of samples, all drilling equipment and temporary casing material will be removed from the boreholes and each boring will be backfilled with neat cement grout. It is anticipated that one soil sample and one groundwater sample will be analyzed from each boring. In addition, vapor samples will be collected and analyzed from selected borings. All selected samples will be analyzed for TPH-g (EPA method 8015M), benzene, toluene, ethyl- benzene, and xylenes (BTEX) and MTBE (EPA method 8021M). Soil and groundwater samples will also be analyzed for TPH-d(EPA method 8015M). Waste Storaze Drill cuttings will be stored in a 5-gallon bucket, pending the results of sample analyses. On-site treatment or off-site disposal of cuttings is not included in this scope of work. Equipment rinse water will be used for grout mixing or stored in an appropriate container. Following characterization, all waste materials will be disposed of in an appropriate manner. REPORTING The report will be detail the methods and findings drilling of the temporary borings. Following receipt of all analytical and well survey data, a technical report will be prepared. The final report will include figures, data tables, and logs of borings. Recommendations may be made for further assessment if deemed necessary. SITE SAFETY Prior to commencement of field activities, a site safety meeting will be held at a designated command post near the working area. Emergency procedures will be outlined at this meeting, including an explanation of the hazards of the known or suspected chemicals of interest. All site