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' 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 interior of the well or groundwater is thoroughly cleaned with either a <br /> steam cleaner, a trisodium phosphate (TSP) solution or an Alconox"M solution and <br /> rinsed with deionized or distilled water before use at the site. This cleaning procedure <br /> ' is followed between each well sampled. If a teflon cord is used, the cord is cleaned. If <br /> a nylon or cotton cord is used, a new cord is used in each well. <br /> All 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 scaled <br /> electric sounder prior to purging or sampling. If the well is known or suspected of <br /> containing free-phase petroleum hydrocarbons, either an optical interface probe or a <br /> bailer is used to measure the hydrocarbon thickness. Measurements are collected and <br /> recorded to the nearest 0.01 foot. Each monitoring well's total depth will be measured; <br /> this will allow a relative judgement of well sedimentation and need for redevelopment <br /> to be made. <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. The color of the water and any film or <br /> obvious odor are 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 hydraulics. Samples will be collected when <br /> temperature, pH, and specific conductance stabilize and a minimum of three well-casing <br /> volumes of water have been removed. Field measurements will be taken after purging <br /> each well volume. Physical parameter measurements (temperature, pH, and specific <br /> conductance) are closely monitored throughout the well purging process and are used as <br /> RESNA INDUSTRIES INC. <br /> Groundwater Sampling Protocol <br /> Latest Revision: Marsch 18, 1992 <br />