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(MM PEA Work Plan <br /> Martin Metals Finishing Inc. (Former) <br /> Stockton, California <br /> 4.2.8 Location Surveying <br /> The coordinates at each sample location will be located with an EOS Arrow sub-meter accuracy <br /> differential global navigation system device. <br /> 4.3 Laboratory Analysis <br /> Sediment and soil samples will be transported under chain of custody (COC) procedures to a California- <br /> certified analytical laboratory. Up to 63 sediment or soil samples and three trench sediment samples will be <br /> analyzed for the following constituents: <br /> • Title 22 metals by USEPA Method 6010B and Waste Extraction Tests13 (WET) as required; <br /> • Hexavalent chromium by USEPA Method 7199; and <br /> • Soil pH by USEPA Method 9045D. <br /> Up to 33 subsurface soil samples will be analyzed for VOCs by USEPA Method 8260B with USEPA 5035 <br /> samplers. <br /> Up to 23 soil vapor samples will be analyzed using the following methods: <br /> • VOCs by USEPA Modified Method TO-15; and <br /> • Oxygen by USEPA D1946; and <br /> • Helium by Method ASTM 1946. <br /> 4.4 Quality Assurance/Quality Control Plan <br /> A QA/QC Plan was developed to demonstrate the reliability and defensibility of the samples and data <br /> collected during the PEA and to assess the consistency of the overall sampling effort, including collection, <br /> transport, and analysis (Appendix C). This QA/QC Plan sets forth quality guidelines for activities, services, and <br /> products related to the PEA and is designed to ensure that project goals are accomplished in an approved manner <br /> by technically trained, competent staff. <br /> The QA/QC Plan: <br /> • Identifies project organization and responsibilities; <br /> • Contains a DQO analysis using EPA's seven step procedures; <br /> 13 If analytical results indicate elevated total metal concentrations, CDIM may recommend that the samples be subsequently <br /> analyzed for soluble concentrations. Samples with any metal concentration greater than 10 times the soluble threshold limit <br /> concentration (STLC)will also be analyzed for soluble metals using the California waste extraction test(WET)method.Any <br /> total threshold limit concentration (TTLC) exceeding 20 times the STLC value, the sample will be submitted for analysis by <br /> the Federal toxicity characteristic leaching potential (TCLP). <br /> CDIM—Fairgrounds Industrial Park Page 14 <br />