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9 <br /> 5 0 GROUNDWATER SAMPLING <br /> 5 1 Well Develo ment and Ground Water Sampling Procedure <br /> s <br /> On November 4 and 5, 1992, ground water Monitoring Wells W-3, W-5, W-fi, and <br /> W-7 were developed by using surge block and bail methods to remove the fine-grained <br /> materials from the filter pack and casing, to stabilize the filter pack around the well <br /> screen, and to produce representative water samples from the water-bearing zone <br /> Well development equipment was steam-cleaned prior to mobilization to the site, <br /> between use in each well, and prior to leaving the site Based on available data, wells <br /> were developed in the order of least-chemically-affected to most-chemically-affected <br /> to minimize potential of cross-contamination During development, 8 to 10 casing <br /> volumes of water were purged from each well None of the water removed from the <br /> wells appeared to have a hydrocarbon sheen or odor Well development logs are <br /> retained in Canonie's project files <br /> As stated in the Work Plan, the water removed during well development served as the <br /> well purge for the initial sampling event On November 5, 1992, each ground water <br /> well was sampled with a new, clean disposable PVC bailer The temperature, pH, and <br /> conductivity were noted during sample bailing and recorded on the sampling logs, <br /> which are retained in Canonie's protect files <br /> 5 2 Ground Water Sample Handlin and Ang.Lysis <br /> Ground water samples obtained from each of the wells were analyzed for TPH-G (by <br /> Modified EPA Method 8015), EDB (by EPA Method 8010), and for BTEX (by EPA <br /> Method 8020) As required by the County EHD, Well W-5 was also sampled for <br /> IPLOW 491 6344REP0ATSY57TE AS5YMANTECAYMANTECA RPT [Apr 26 931 <br /> nonteEnvlronmental <br />