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If groundwater is encountered at each boreholes drilled, grab samples will be <br />collected down hole (either through the drive rods or temporary installed 1-inch PVC <br />well screen) using a peristaltic pump and disposal polyvinyl tubing under low flow <br />conditions. <br />Monitor the headspace of each sample for the presence of volatile organic compounds <br />using a photo-ionization detector (PID) or flame-ionization detector (FID). <br />The soil boring will be logged using the Unified Soils Classification System under the <br />supervision of FR' s State Professional Geologist (PG) or Registered Professional <br />Engineer. Laboratory analysis will be compared to regulatory limits set forth by the <br />Department of Toxic Substances Control (DTSC), and Central Valley Regional Water <br />Quality Control Board. <br />Soil Gas Sampling Methodology <br />Soil vapor sampling will be performed by hydraulically pushing soil gas probes to a <br />depth of 5.0 feet below ground surface (bgs). An electric rotary hammer drill will be used <br />to drill a 1.0-inch diameter hole through the overlying surface to allow probe placement <br />when required. The same electric hammer drill will be used to push probes in areas of <br />resistance during placement. <br />At each sampling location, an electric vacuum pump set to draw 0.2 liters per minute <br />(L/min) of soil vapor will be attached to the probe and purged prior to sample collection. <br />Vapor samples will be obtained in SGE gas-tight syringes by drawing the sample through <br />a luer-lock connection which connects the sampling probe and the vacuum pump. <br />Samples are immediately injected into the gas chromatograph/purge and trap after <br />collection. New tubing shall be used at each sampling point to prevent cross <br />contamination. Once samples are collected the vapor probes will be removed and the <br />boreholes will be abandoned with bentonite and a concrete cap in accordance with the <br />drill permit requirements. <br />The vapor samples are to be analyzed for Volatile Organic Compounds (VOCs) via EPA <br />Method TO 15 at a certified laboratory. <br />All work shall be performed under the supervision of FR's State Professional Geologist <br />(PG) or Registered Professional Engineer. Laboratory analysis will be compared to <br />regulatory limits set forth by the Department of Toxic Substances Control (DTSC), and <br />Central Valley Regional Water Quality Control Board. <br />18-22 East 11' Street, Tracy California <br />Site Assessment Work Plan <br />5 Fulcrum Resources Environmental