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Compliance & Closure, Inc <br /> Groundwater Sampling Protocol <br /> Latest Revision October 2001 <br /> Equipment Cleaning and Decontamination <br /> All water samples are placed in precleaned laboratory-supplied bottles Sample bottles and caps remain sealed <br /> until actual usage at the site All equipment which comes in contact with the well or groundwater is thoroughly <br /> cleaned with hexane wipes then trisodium phosphate (TSP) solution and rinsed with deionized or distilled water <br /> before each use at the site This clearing procedure is followed between each well sampled Wells are sampled <br /> in approximate order of increasing contamination If a Teflon cord is used, the cord is cleaned If a nylon or <br /> cotton cord is used, a new cord is used in each well If equipment blanks are collected, they will be collected <br /> between monitoring wells to test decontamination procedures The blanks are analyzed periodically to ensure <br /> proper cleaning procedures are used <br /> Water Level Measurements <br /> Depth to groundwater is measured in each well using a sealed sampling tape or scaled electric sounder prior to <br /> purging or sampling If the well is known or suspected of containing free-phase petroleum hydrocarbons, an <br /> optical interface probe is used to measure the hydrocarbon thickness and groundwater level Measurements are <br /> collected and recorded to the nearest 0 01 foot Each monitoring well's total depth will be measured, this will <br /> allow a relative judgment of well siltation to be made and need for redevelopment <br /> Bailer Sheen Check <br /> If no measurable free-phase petroleum hydrocarbons are detected, a clear acrylic bailer is used to determine the <br /> presence of a sheen Any observed 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 A disposable bailer is used to <br /> purge the well The amount of purging is dependent on the well yield In a high yield formation, samples will <br /> be collected when normal field measurement, including temperature, pH, and specific conductance stabilize, <br /> provided a minimum of three well-casing volumes of water have been removed Field measurements will be <br /> taken after purging each well volume Physical parameter measurements (temperature, pH, and specific <br />