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PANOCHE BURN SITE REMEDIATION <br /> 3.4.1 Sampling Procedures <br /> Thirty soil samples were obtained using stainless steel hand trowels to collect the samples <br /> into pre-supplied laboratory plastic containers. The containers were completely filled, capped, <br /> labeled, and stored at 4 degrees Celsius. To prevent cross-contaminating the samples, the <br /> stainless steel trowels were decontaminated by field-washing them with isopropyl alcohol <br /> and double-rinsing with distilled water. One water sample was collected at the surface along <br /> the retention dam. The grab sample was placed in a laboratory-provided, half-liter, plastic <br /> container with preservative and cooled to 4 degrees Celsius. <br /> At the end of each sampling activity, the samples were submitted, using a chain-of-custody <br /> protocol, to a state-certified hazardous waste laboratory for analyses. All of the samples <br /> received by the laboratory have the proper chain-of-custody; however, additional analyses not <br /> initially requested were performed on the samples by the same laboratory. The CIWMB <br /> engineer requested these additional analyses to further characterize the submitted samples. <br /> Figure 9 provides an overview of the sampling locations. <br /> 3.4.2 Sampling and Analysis <br /> Based on the site assessment, field investigations, and contamination, the CIWMB and <br /> CH2M HILL engineers took the following samples: <br /> ➢ Three burn ash samples <br /> ➢ Two soil samples taken directly below the burn ash <br /> ➢ Four background soil samples <br /> ➢ Six split, verification samples during U.S. EPA confirmation sampling <br /> ➢ Three gravel/soil stained samples <br /> ➢ Twelve confirmation soil samples <br /> ➢ One retention water sample <br /> Sampling was conducted under the California Code of Regulations, Title 22, Section <br /> 66261.10, et seq., for characterizing hazardous waste. The CIWMB used regulatory limits <br /> established from the DTSC for evaluating the soil/ash samples and limits from the California <br /> Department of Health Services for the water sample. Soil samples were assessed using the <br /> Total Threshold Limit Concentration (TTLC) and Soluble Total Limit Concentration (STLC) <br /> while the water sample was assessed by the established Maximum Contaminant Level <br /> (MCL). <br /> CIWMB 23 <br />