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F� <br /> i <br /> stored and transported in steam m cleaned and protected <br /> W- inert containers. Nitrile gloves will be worn at all <br /> times during sample equipment cleaning, handling, and <br /> sample collection. <br /> i <br /> 3 . All equipment will be thoroughly rinsed with deionized <br /> - ( DI ) water immediately after cleaning. <br /> 4. All equipment will be thoroughly rinsed with DI water <br /> twice before insertion into a _fell. <br /> 5. Bailers and pumps will be suspended on clean, DI-water- <br /> rinsed polypropylene rope. <br /> 4. 6.2 Presam2ling Measurements <br /> Prior to the purging and sampling of each well, the depth to <br /> standing water and the total depth of the well will be measured <br /> using a decontaminated optical interface probe. A clear acrylic <br /> bailer will then be inserted into the well to just below the <br /> static water level and removed to check for the presence of any , <br /> floating product. These presample measurement data will be <br /> recorded on a Record of Well Gauging and Purging form and used to <br /> calculate the volume of standing water in the well (one well <br /> casing volume ) . Measurements will be made to the nearest 0.01 <br /> foot and referenced to the permanent surveyed reference point on <br /> the well casing. <br /> 4 .6. 3 Well Purging <br /> Prior to sampling, standing water in the well and the surrounding <br /> sand pack will be purged. Between 4 and 6 casing volumes of well <br /> water will be purged, to ensure that all stagnant water has been <br /> removed. The well will be purged with an air-lift pump, submer- <br /> sible pump, or bailer, decontaminated as discussed above in <br /> Section 4 .6. 1 . <br /> c51 /97780/6-90/tx 10 <br />