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Limited Phase II Subsurface Investigation Work Plan <br /> 1319 & 1327 South Madison Street <br /> Stockton, California 95206 <br /> The tentative locations of the proposed borings are shown on the attached figure. Boring locations <br /> are subject to change based on access and utility locations. <br /> Each soil boring will be logged by AEI staff; soil cores will be logged and described in general <br /> accordance with the Unified Soil Classification System (USCS); soils will be screened with a <br /> portable organic vapor meter (OVM) or photo-ionization detector (PID) and for sensory <br /> perception. One (1) soil sample from the borings located near the inground lift, waste drums, and <br /> soil area west of the Site building will be selected for the analyses of total petroleum hydrocarbons <br /> (TPH) and volatile organic compounds (VOCs). In addition, the soil sample collected near the <br /> inground lift will also be analyzed for PCBs and the soil samples in the unpaved areas north and <br /> west of the Site building will be analyzed for Resource Conservation and Recovery Act (RCRA) 8 <br /> Metals. <br /> 4.3 Soil Gas Probe Installation and Sampling <br /> Four soil borings will be completed as temporary gas probes. The probe will be constructed using <br /> 0.25-inch diameter Teflon tubing connected to a 1-inch plastic probe tip. The probe tip will be <br /> placed in the middle of an annular filter pack composed of Lonestar No. 3/12 sand placed between <br /> 4.5 and 5.5 feet bgs. The probe will then be sealed with a 1-foot layer of dry granular bentonite <br /> followed by hydrated granular bentonite to grade. Water will be added at the surface to hydrate <br /> the upper portion of the granular bentonite to ensure proper sealing during sampling activities. <br /> Sampling of soil gas will be conducted by vacuum testing and purging the wells and by using helium <br /> as a tracer compound. The soil gas samples will be collected through a calibrated flow controller <br /> and into one-liter laboratory-supplied evacuated canisters. Soil gas samples will be analyzed for <br /> VOCs using US EPA Testing Method TO-15. <br /> 4.4 Boring Destruction <br /> Following completion of sample collection and removal of tooling, the borings will be backfilled <br /> with neat cement grout as required by the permitting agency and completed at the surface with <br /> concrete to match the surrounding conditions. <br /> 4.5 Investigation Derived Waste <br /> Upon completion of the work, investigation-derived waste will be left on-site, pending appropriate <br /> disposal. Removal and transport of the waste(s) to an appropriate disposal facility can be <br /> arranged and implemented upon client approval. <br /> 5.0 Estimated Schedule <br /> Completion of this work is contingent upon approval of this work plan, receipt of approved drilling <br /> permits, and pending subcontractor availability. Work will be scheduled upon review of this work <br /> plan by San Joaquin County Department of Environmental Health. It is expected that sample <br />