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Mr. Jim Barton RWQCB March 29, 2013 Page 14 Soil samples will be collected by cutting an approximately 6-inch section of the acetate liner and capping each end with Teflon tape and plastic end caps. Samples may also be collected in glass jars and sealed with Teflon tape and tight fitting caps. Each sample container will be appropriately labeled with the sample name, depth, date, time, and sampler's initials. Each sample will also be sealed in a re-sealable plastic bag and placed in a insolated cooler with ice for transport to the analytical laboratory. Sample information will then be recorded on the COC. PID readings and visual observations will be used to select one or more soil samples from each boring. The remaining samples will be placed on hold at the analytical laboratory. Groundwater Sampling When groundwater is encountered, the boring will be extended,approximately five feet and a grab sample will be collected using hydropunch or similar technology. Samples will be transferred into laboratory-prepared sample bottles, labeled, recorded on the COC and placed in a chilled cooler to preserve the samples until analysis by the laboratory. Decontamination Procedures Drill rods and reusable sampling equipment will be properly decontaminated, initially and after each use, to ensure sample quality and eliminate potential cross-contamination between locations. Drilling and re-useable sampling equipment will undergo a three-stage procedure involving a non-phosphate detergent wash, potable.water rinse, and deionized. water rinse. Field Quality Control Samples Field quality control (QC) samples will be collected throughout the duration of the field effort described in this workplan. Duplicate samples (field duplicates) are used to determine the precision associated with field and analytical procedures. Field QC samples have been assigned by the project manager, but may be moved at the discretion of the sampler. QC samples will be collected in the field and submitted to the laboratory with normal samples in accordance with the frequencies described below: • Field duplicate samples at approximately 5 percent of the total number of normal soil vapor and groundwater samples collected. Proposed duplicate sample locations are shown on Table 1. Sampling Handling and Documentation Soil and groundwater sample containers will be sealed, labeled, and placed in a cooler chilled to 4 degrees Centigrade for delivery to the appropriate analytical laboratory with a separate signed custody record enclosed in each sample cooler. Soil vapor samples,les , which are collected in self-contained canisters, will be labeled and submitted to the appropriate analytical laboratory with a signed custody record enclosed.