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Groundwater Sampling an Analysis Plan <br /> Former Texaco Service Station <br /> Chevron Site ID 309075 <br /> ,r January 14, 2011 <br /> evaluation will provide information as to the consistency or inconsistency of peak <br /> r <br /> patterns (and; therefore, the organics present) throughout the "plume". <br /> r <br /> The non-silica gel sample will then be analyzed by gas chromatography/mass spectrometry <br /> (GC/MS) library compound search and evaluated as follows: <br /> • The analysis is essentially an extended USEPA 8270, where routine target peaks are <br /> analyzed and other peaks that are resolvable are attempted to. be identified by their <br /> retention time and mass spectrum. This is accomplished via a "library' of non-routine <br /> compounds with known retention times and mass spectra available to the laboratory's <br /> computer. Automated software will identify the best matches between the unknown <br /> peaks in the sample with the data from the library. The results will then be reviewed by <br /> r an analyst to determine the best compound match for identification. <br /> If positive detections of chemicals that are not petroleum in nature are reported, Chevron will <br /> r review the site records to determine if these chemicals (silicone, bituminous, caulk, isobutene, <br /> coolant, isoprene, curing agents, urethane, filler, solvents, high modulus, hot modulus, hot melt <br /> butyl, laminate, neoprene, opacifier, primer, resin, etc.) were historically stored at the site. <br /> r <br /> 3.2 SAMPLE IDENTIFICATION SYNTAX <br /> ,r Each groundwater sample will be given a unique designation code. The sample designation will <br /> be in accordance with the Chevron Texaco Sample ID Naming Convention and recorded on the <br /> label affixed to the sample container and on the chain-of-custody record. <br /> V <br /> Groundwater samples will be labeled by the well identification number, followed by the matrix, <br /> and date. The boring identification number will consist of a "MW" followed by a dash and <br /> groundwater zone identification and a digit number. The matrix will consist of a "W" for <br /> groundwater well samples. The date will be in the yymmdd format. An example of a sample <br /> identification number for a monitoring well labeled MW-6D, sampled on April 30, 2011 would be <br /> +-• as follows: MW-6D-W-110430. <br /> V <br /> 4 <br /> V <br /> ti <br /> \\CA5FP\Data\Nproject\ENV\CHEVRON\309075\6 Deliverables\Work Plan\SAP\309075_SAP_6671110950.doc 4 <br /> V <br />