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Alpha <br /> Environmental <br /> including former auto repair and metal manufacturing areas. Proposed soil boring locations are <br /> shown on Figure 2,Proposed Boring Location Map. <br /> Soil samples will be collected from each boring at 2,5,and 10 feet bgs. Additionally,temporary soil <br /> vapor probes will be set at a depth of 5 feet bgs for the collection of soil vapor samples in select <br /> locations. Soil samples will be visually examined and described according to the Unified Soil <br /> Classification System. Alpha will utilize a photo ionization detector (PID) to field-screen the <br /> collected soil samples for the presence of volatile organic compounds(VOCs). All field work will <br /> be conducted by or under the supervision of a California-registered Professional Geologist or <br /> Registered Civil Engineer, employed by Alpha. <br /> The soil gas survey will be completed in accordance with the "Advisory — Active Soil Gas <br /> Investigations" by the California Department of Toxic Substances Control (DTSC), Los Angeles <br /> Regional Water Quality Control Board (RWQCB), and San Francisco Bay RWQCB, dated April <br /> 2012. <br /> Alpha Environmental will leave the site in a neat and orderly condition upon the completion of the <br /> investigation. Trash, field supply waste, and other materials used in the investigation will not be <br /> allowed to accumulate at the site. Based on the direct push drilling method to be used,soil cuttings <br /> are not expected to be generated. <br /> 3.1.4 Task 4-Analytical Characterization <br /> All soil and soil vapor samples will be submitted to an independent state-certified laboratory for <br /> analysis. Soil samples not initially analyzed will be archived for potential future analysis,based on <br /> the analytical results of the initial samples. All soil vapor samples collected will be analyzed for <br /> volatile organic compounds(VOCs)using EPA Method 8260B. Selected'soil samples collected will <br /> be analyzed for total petroleum hydrocarbons(TPH) for the complete carbon-chain analysis using <br /> EPA Method 8015M, VOCs using EPA Method 8260B, and CAM 17 Metals using EPA Method <br /> 6010Bn471A. Additionally, select soil samples from locations exhibiting high concentrations of <br /> TPH in the hydraulic oil range(if any)will be analyzed for polychlorinated biphenyls(PCBs)using <br /> 'Selection criteria would be based on field geologist/engineer's judgement,considering physical indications <br /> (staining,odor,texture etc.)and PID screening. <br /> 33 North Center Street <br /> Stockton,California 4 March 2014 <br />