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GROUNDWATER SAMPLING PROCEDURES -- <br />Equipment Cleaning <br />All water samples are placed in precleaned laboratory -supplied bottles. Sample <br />bottles and caps remain sealed until actual usage at the site. All equipment which <br />comes in contact with the well or groundwater is thoroughly cleaned with a trisodium <br />phosphate (TSP) solution and rinsed with deionized or distilled water before use at the <br />site. This cleaning procedure is followed between each well sampled. Wells are <br />sampled in approximate order of increasing contamination. If a teflon cord is used, the <br />cord is 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 <br />periodically to ensure proper cleaning. <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 or suspected <br />of containing free -phase petroleum hydrocarbons, an optical interface probe is used to <br />measure the hydrocarbon thickness and groundwater level. Measurements are <br />collected and recorded to the nearest 0.01 foot. <br />Bailer Sheen Check <br />If no measurable free -phase petroleum hydrocarbons are detected, a clear acrylic <br />bailer is used to determine the presence of a sheen. Any observed film as well as <br />odor and color of the water is recorded. <br />ENSCO ENVIRONMENTAL SERVICES, INC. <br />Groundwater Sampling Protocol <br />Latest Revision: April 20, 1989 <br />