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701 <br /> < < <br /> MEMO <br /> c <br /> SAMPLING PROCEDURES <br /> �• Equipmpnt Cleaning. - All water samples are placed in precleaned laboratory <br /> supplied glassware. Sample bottles and caps remain sealed until actual <br /> usage at the site. Before use at the site, all equipment which comes in <br /> contact with the well or groundwater is thoroughly cleaned with trisodium <br /> phosphate and rinsed with deionized or distilled water. This procedure is <br /> :. followed between each well sampled, and wells are sampled in approximate <br /> order of increasing contamination. A pump blank is collected prior to all <br /> l :.a <br /> sampling. Pump blanks are analyzed periodically to ensure proper cleaning. <br /> F <br /> i <br /> r <br /> Water Level Reasurements - Prior to checking for floating product, purging <br /> of the well, and sampling, the depth to water is measured in each well using <br /> a s3ealed sounding tape or a scaled electric sounder. Water levels are <br /> recc.:,led in the field log book to the nearest 0.01 foot. <br /> F <br /> Floating Pro U,t Thickness - A field check for floating product is made <br /> with a clear acrylic or teflon bailer. Thickness of floating product is <br /> measured to the nearest 1/32 of an inch. Any observed film as-well-as odor <br /> .� and color of the water is recorded. 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. <br /> Latest Revision: October 9, 1987 <br />