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ah <br /> Tri-Valley Growers November 9, 1987 <br /> «r Project No. 1582G Page 5- 1 <br /> -, SECTION 6.0 <br /> FIELD INVESTIGATIVE MgIHODS <br /> Exceltech's investigation consisted of 1) drilling three exploratory boreholes <br /> (MW-1 through MW-3), 2) converting these boreholes into groundwater <br /> monitoring wells, 3) collecting groundwater samples from the newly <br /> "w installed monitoring wells, 4) surveying the well heads,and 5) collecting a <br /> groundwater sample from one off-site domestic well (Figure 3, AGRA). The <br /> SJLHD reviewed and approved the proposed work plan prior to initiating the <br /> wo rk. <br /> 5.1 EXE DRAMBYMILLING <br /> The subsurface investigation consisted of drilling thee exploratory borings <br /> at pre-selected locations to determine the presence or absence of <br /> contamination in the soil and groundwaier. Each boring was drilled with a <br /> skid mounted drill-rig using hollow-stem augers. The drilling equipment and <br /> augers were steam cleaned prior to use. The sampling equipment was <br /> washed between each sampling interval with trisodium phosphate and rinsed <br /> with fresh water. Relatively undisturbed soil samples were collected at <br /> 5-foot intervals using a California modified split-spoon sampler equipped <br /> �., with 2 x 6-inch clean brass liners. Borings were advanced to the desired <br /> depth with the hollow-stem auger and then the sampler was lowered through <br /> r <br /> the augers to the bottom of the borehole and driven 18-Inches into the soil <br />