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Compliance & Closure, Inc. <br /> Groundwater Sampling Protocol <br /> Latest Revision: March 1998 <br /> Equipment Cleaning and Decontamination <br /> All water samples are placed in precleaned laboratory-supplied bottles <br /> Sample bottles and caps remain sealed until actual usage at the site. All <br /> equipment which comes in contact with the well or groundwater is thoroughly <br /> cleaned with trisodium phosphate (TSP) solution and rinsed with deionized or <br /> distilled water before each use at the site . This cleaning procedure is <br /> followed between each well sampled. Wells are sampled in approximate order <br /> of increasing contamination. If a teflon cord is used, the cord is cleaned <br /> If a nylon or cotton cord is used, a new cord is used in each well . All <br /> equipment blanks are collected prior to sampling. The blanks are analyzed <br /> periodically to ensure proper cleaning procedures are used. <br /> Water Level Measurements <br /> Depth to groundwater is measured in each well using a sealed sampling tape or <br /> scaled electric sounder prior to purging or sampling. If the well is known <br /> or suspected of containing free-phase petroleum hydrocarbons, an optical <br /> interface probe is used to measure the hydrocarbon thickness and groundwater <br /> level . Measurements are collected and recorded to the nearest 0 01 foot <br /> Each monitoring well ' s total depth will be measured, this will allow a <br /> relative judgment of well siltation to be made and need for redevelopment <br /> Bailer Sheen Check <br /> If no measureable free-phase petroleum hydrocarbons are detected, a clear <br /> acrylic bailer is used to determine the presence of a sheen Any observed <br /> film, as well as odor and color of the water is recorded <br /> Groundwater Sampling <br /> Prior to groundwater sampling, each well is purged of "standing" groundwater <br /> Either a bailer, hand pump, or submersible pump is used to purge the well <br /> , The amount of purging is dependent on the well yield In a high yield <br /> formation, samples will be collected when normal field measurement, including <br /> temperature, pH, and specific conductance stabilize, provided a minimum of <br /> three well-casing volumes of water have been removed Field measurementswill <br />