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837 Shaw Road • Stockton, CA 95215 <br />Telephone (800) 511-9300 • Fax (888) 445-8786 <br />Project No. 14-3002 <br />Subject: Draft Soil Boring Scope of Work <br />Former SAN JOAQUIN COGENERATION <br />17200 Murphy Parkway, Lathrop, California <br />SCOPE OF WORK <br />AdvancedGeo, Inc. (AGI) proposes to advance approximately 68 soil borings within and <br />around the former power plant area to define the extent of buried waste and to <br />assess/define soil and groundwater impacted by the contaminants of concern at the site. <br />All soil borings will be advanced to 20 feet below surface grade (bsg) using a direct-push <br />drilling rig equipped with 1-inch or 2-inch diameter drilling rods. Proposed boring locations <br />are depicted on Figure 2. <br />SOIL SAMPLE COLLECTION <br />Soil and waste samples will be collected from the borings using a soil sampling assembly <br />loaded with a five-foot acetate liner. Soil samples will be collected continuously between <br />the surface and the total depth of all borings. Soil and waste encountered in the borings <br />will be visually classified by AGI personnel in accordance with the USCS or type of <br />materials encountered. Additionally, soil samples will be field screened for the presence <br />of VOCs using an OVM. Upon sample retrieval, the acetate sleeve will be cut open to <br />expose the entire soil core to classify the soil and inspect the core for waste. Selected <br />soil samples will be collected by hand-packing the material into precleaned and certified, <br />4-oz, Teflon-lined closure, wide-mouth clear glass sample containers (sample jars). <br />Selected soil samples will be analyzed for: <br />Total PCBs (dry weight) by EPA Method 8082A. <br />Total petroleum hydrocarbons (TPH) quantified as gasoline, diesel, and oil range <br />compounds (TPH-g/d/o) in accordance with EPA Method 8015 Modified. <br />A portion of the borings will be advanced only to locate and identify buried waste. Samples <br />will be preserved for analysis from selected borings based on data gaps to define PCB <br />and TPH impact. The final work plan will present cross-sections and maps identifying <br />boring locations for sample analysis, waste identification, or both. Proposed boring <br />locations are depicted on Figure 2.