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l <br /> San Ramon for chemical analyses. The groundwater samples will be analyzed for TPH-G (EPA Method <br /> 5030/8015), TEPH (EPA Method 3510/8015), and BTEX (EPA Method 602). <br /> IQUALITY ASSURANCE/QUALITY CONTROL AND CHAIN-OF-CUSTODY PROCEDURES <br /> In order to ensure a successful sampling program, quality assurance and quality control procedures will be <br /> jcarefully followed. The key points of the quality assurance procedures pertain to the submittal of quality <br /> assurance samples and document control (decontamination procedures have been previously discussed). <br /> Quality Assurance Samples <br /> jQuality assurance samples will be used to evaluate the quality of the data obtained from the field program. <br /> Two distinct types of quality assurance samples will be used for this purpose. <br /> j1. Blind duplicates of water samples will be submitted to the testing laboratory at a minimum rate <br /> of 1 per 10 regular samples obtained. <br /> I2. Field travel blanks will be submitted at a rate of 1 per 10 water samples collected, but no less <br /> than one per ice chest, in order to determine if cross contamination occurred in transit. All <br /> Ifield travel blanks will be supplied by the testing laboratory. <br /> I Soil and groundwater samples will be submitted to a State of California-certified analytical laboratory for <br /> chemical analyses. Established QA/QC procedures for analytical operations will include sample custody <br /> I procedures, standards of analytical accuracy, analyses of matrix spikes and method blanks, data reduction, <br /> verification of raw analytical data, and maintenance of control charts to monitor analytical performance. <br /> I These QA/QC procedures are outline in the laboratory Quality Assurance/Quality Control Plan which is <br /> available upon request. Organic chemical analyses will be performed in conformance with standard <br /> l procedures established by the United States Environmental Protection Agency (EPA) in "Guidelines <br /> Establishing Test Procedures for the Analysis of Pollutants Under the Clean Water Act"(40 CFR <br /> i Part 136, October 1984). The laboratory is periodically evaluated through external audits conducted by <br /> 1 the EPA and the State of California Department of Toxic Substances Control using QC laboratories. <br /> 1 Chain-of-Custody <br /> Chain-of-custody procedures will be used to identify and ensure traceability of the samples collected. <br /> 1 These procedures will also be used to document the handling and shipping procedures of the sample(s). <br /> Specifically, the chain-of-custody procedures will trace the sample(s) from collection, through all custody <br /> 1 <br /> cca/03/10/95 09:38 AM(0688brpt.dodntw12) 4-8 <br /> i <br />