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33 Hunters Square August 17, 2010 Stockton California Project No. 401478012 Soil and groundwater samples will be collected from borings B-1 through B-3 and soil vapor samples are to be collected from SV-1 through SV-3. A permit application for the installation of the borings has been submitted to the San Joaquin County Environmental Health Department. Subsequent to the completion of sampling activities the borings will be grouted from their bot- tom depth to several inches below the surface and finished to match the existing ground surface. The borings will not be left open overnight. The following laboratory analyses are proposed: • A soil sample will be collected from each boring (B-1 through B-3) at a depth where soil is first encountered. The three soil samples will be composited into one sample by the labora- tory and will be analyzed for Title 22 metals using EPA Method 6010B. • Groundwater samples will be collected from borings B-1 through B-3 for analysis of Total Petroleum Hydrocarbons as gasoline, diesel, and motor oil using EPA Method 801513, and volatile organic compounds (VOCs) using EPA Method 8260B. Subsequent to reaching the final depth in each soil boring, a new screened PVC casing will be installed in each boring. Groundwater samples will be collected using a peristaltic pump with new tubing or a stainless steel bailer. If the peristaltic pump is used, it will be operated at a low speed to minimize disturbance of groundwater which could results in the release of VOCs. Groundwa- ter samples will be collected in the appropriate laboratory supplied containers. The sample containers will be labeled and stored in a cooler on ice for transportation under chain of cus- tody to a state-certified analytical laboratory for analysis. • Soil gas samples will be collected from three borings (SV 1 through SV-3) advanced on site. The borings will be advanced to a depth of approximately 5.5 ft bgs using a direct push drill rig.A soil gas sampling probe will be installed within a sand pack in each boring at a depth of approximately 5.0-5.5 feet bgs. The soil gas probe will be connected to the stainless steel sampling manifold by Teflon tubing and Swagelok fittings. The boring will be sealed around the Teflon tubing using hydrated bentonite powder. Prior to sample collection a leak test will be performed by capping the end of the sampling manifold and opening the valve of the purge canister to evaluate whether a leak is present in the sampling system. If no drop in vac- uum pressure is observed, the leak test will be considered successful and purging/sampling will be performed. The sampling manifold will be connected to the down-hole tubing and cotton balls soaked in isopropyl alcohol will be placed near the sampling system. Isopropyl alcohol will be included in the analysis of the soil gas samples to evaluate whether leaks oc- curred in the sampling system. The volume of air within the sampling probe, tubing and manifold will be purged using a purge summa canister. Subsequent to purging, the soil vapor samples will be collected in a 1-liter Summa canisters. Sample canisters will be stored in the shade and protected from significant changes in temperature while being transported under 401478012 Workplan 2 JVW7 v&ffioore