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GROUND ZERO ANALYSIS,INC. Quality Control/Quality Assurance Plan <br /> During sampling, latex gloves will be worn to prevent cross-contamination with other samples. The <br /> disposable gloves will be discarded after collecting samples from each sample drive. <br /> Soil samples will be collected at five foot intervals, at significant changes in lithology and intervals <br /> of obvious contamination in order to develop a complete profile of soil contamination. <br /> 9.2 Sample Collection during Tank Removal or Excavation <br /> Soil samples will be collected as soon as possible after removal of the tank. Where feasible, all <br /> preparations for soil sampling will be made prior to tank removal. Soil samples collected from a <br /> backhoe bucket or directly from the excavation floor will be collected in a thin-walled stainless steel <br /> or brass cylinder at least three inches long by one inch in diameter. From 3 to 24 inches of soil will <br /> be removed from the immediate surface area where the sample is to be taken and the cylinder then <br /> pounded into the soil with a wooden mallet, bulk density driver, or other decontaminated driving <br /> device. No head space will be present in the cylinder once the sample is collected. Soil samples to <br /> be analyzed for volatile compounds will be collected in EnCore samplers per EPA Method 5035. <br /> Care will be taken to avoid contamination of both the inside and outside of the cylinder as well as its <br /> contents. During sampling, latex gloves will be worn to prevent cross contamination with other <br /> samples. One pair of disposable gloves will be dedicated to each sample collected. <br /> Once the sample is collected,each end of the cylinder will be sealed with Teflon tape and then capped <br /> with a polyethylene lid,taped, and labeled. Soil samples to be analyzed for volatile compounds will <br /> be collected in EnCore samplers per EPA Method 5035. The sample will then be individually sealed <br /> in a ziplock bag and immediately placed in an ice chest containing dry ice or frozen chemical ice for <br /> delivery to a state certified laboratory. Sample identification, storage and transportation will be <br /> conducted as outlined in the previous section. <br /> 9.3 Sampling from Soil Piles or Shallow Soil Pits <br /> Soil samples will be collected and transported from excavated material in the manner described in the <br /> previous section, however, a backhoe will not be utilized. If composite samples are collected, four <br /> brass cylinders will be collected for every 50 cubic yards of material to be sampled unless otherwise <br /> specified by the lead regulatory agency. Soil samples to be analyzed for volatile compounds will be <br /> collected in EnCore samplers per EPA Method 5035. The samples will be composited by the state <br /> certified analytical laboratory personnel prior to testing. <br /> 9.4 Active Soil Vapor Sampling <br /> Active soil vapor sampling will be conducted in accordance with the procedures specified in the <br /> document Advisory—Active Soil Gas Investigations (DTSC and RWQCB, July 2015). <br /> G:\Data\GROUNDZE\STALLWORTH AUTO SALES(N CA)1380\Workplan\QA.QC Plan.docx <br /> 8 <br />