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i <br />' Equipment Cleaning and Decontamination <br />' All water samples are placed in precleaned laboratory-supplied bottles. Sample bottles <br /> and caps remain sealed until actual usage at the site All equipment which comes in <br /> contact with the well or groundwater is thoroughly cleaned with a trisodium phosphate <br /> (TSP) solution and rinsed with deionized or distilled water before use at the site. This <br /> cleaning procedure is followed between each well sampled. Wells are sampled in <br /> approximate order of increasing contamination. If a teflon cord is used, the cord is <br />' cleaned 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 periodically <br />' to ensure proper cleaning procedures are used. <br /> Water Level Measurements <br />' <br /> Depth to groundwater is measured in each well using a sealed sampling tape or scaled <br /> P <br /> electric sounder prior to purging or sampling. If the well is known or suspected of <br />' containing free-phase petroleum hydrocarbons, an optical interface probe is used to <br /> measure the hydrocarbon thickness and groundwater level Measurements are collected <br /> and recorded to the nearest 0 01 foot. Each monitoring well's total depth will be <br /> measured, this will allow a relative judgement of well siltation to be made and need for <br /> redevelopment. <br /> Bailer Sheen Check <br /> If no measurable free-phase petroleum hydrocarbons are detected, a clear acrylic bailer <br /> is used to determine the presence of a sheen Any observed film as well as odor and <br /> color of the water is recorded <br /> Groundwater Sampling <br /> Prior to groundwater sampling, each well is purged of "standing" groundwater Either <br /> a bailer, hand pump, or submersible pump is used to purge the well The amount of <br /> purging is dependent on the well yield In a high yield formation, samples will be <br /> collected when normal field measurement, including temperature, pH, and specific <br />' conductance stabilize, provided a minimum of three well-casing volumes of water have <br /> been removed Field measurements will be taken after purging each well volume <br /> Physical parameter measurements (temperature, pH, and specific conductance) are <br /> closely monitored throughout the well purging process and are used as indicators for <br /> RESNA INDUSTRIES, INC <br /> Groundwater Sampling Protocol <br /> Latest Revision October 23, 1991 <br />