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Site Assessment Proposal <br /> 77 Frontier Transportation <br /> Doc # 101501 <br /> October 15, 1997 <br /> i <br /> summarized as follows : <br /> 1 . Measure water levels. <br /> 2. Purge the well and determine groundwater parameters (pH, conductivity, <br /> and temperature) . <br /> 3 . Collect equipment blanks. <br /> 4. Withdraw the samples and duplicates. <br /> 5 . Preserve sample water as necessary. <br /> 6 . Store samples for transport . <br /> 7 . Analyze samples by EPA methods 8015-M for gasoline and 8020 for <br /> volatile aromatics with minimum detection limits 0 . 05 mg1L (8015) and 0 . 5 <br /> /ig/L (8020). <br /> Well Purgine - Water standing in a well for several days or longer, prior to sampling, may <br /> not be representative of in-situ or formation water. This " stagnant" water may be affected by: <br /> a Oxidation-reduction conditions of water in the well being different from <br /> those in the formation. <br /> a Volatilization occurring in the standing water. <br /> a Slow reactions between the well materials and the water, accentuating <br /> parameters of interest. <br /> j As a result, the standing water must be purged or evacuated from the well to allow <br /> complete replacement by fresh formation water. The volume of water that must be removed from <br /> each well to obtain a representative sample will be determined by continuous monitoring of the <br /> groundwater parameters, including pH, specific conductivity and temperature. The point at which <br /> the purging process is considered adequate will be demonstrated by a stabilization of these <br /> parameters. <br /> All work will be performed per California Regional Water Quality Control Board <br /> (CRWQCB) guidelines under the direct supervision of California Registered Civil Engineer with <br /> more than ten years experience in the environmental field. All soil cuttings and development <br /> water will be properly containerized, labeled and stored on-site in DOT approved 17-H 55-gallon <br /> drums for disposal at a later date by appropriately licensed individuals . Underground Services <br /> Alert will be notified 72 hours prior to performing any subsurface activities. <br /> 8.0) FIELD DOCUMENTATION AND CHAIN-OF-CUSTODY <br /> The following sections describe the recording system for documenting all site field <br /> 6 <br />