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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 /> j T twice before insertion into a well. <br /> 5. Bailers and pumps will be suspended on a clean, DI-water- <br /> rinsed length of polypropylene rope. The rope will be <br /> discarded after each well. <br /> B.6.2 Presam ling Measurements <br /> k <br /> I <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 /> with a decontaminated optical interface probe. A clear acrylic <br /> bailer will then be inserted into the well to just below the <br /> i <br /> static water level and removed to. check for the presence of any <br /> floating product. These presample. measurement data will be E <br /> recorded on a Record of Well Gauging and Puand 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 i <br /> foot:.and. referenced. to the permanent, surveyed reference point on <br /> , i the well casing. <br /> .6,; <br /> h B.6.3 well Purging <br /> 64 <br /> ' Prior to sampling, between four and six casing volumes of <br />' standing water in the well and the surroundingsand pack will be <br /> -purged-using an air-lift pump or bailer, decontaminated as <br /> described above. <br /> above <br /> {: Should the well pump dry- after the initial casing dewatering, the <br /> pump will be turned off. or the ba.iling discontinued and ,the. ,Je1l <br /> allowed to .recover; and pumping or. bailing will be continued to <br /> ka _obtain the desired purge Volume• Field parameters of pH, temper- <br /> t'' F ature, and electrical conductance will be. meazured during each <br /> . + � B-5 <br /> e42/71050/7-90/apb <br /> w <br /> III RIO IN1111 mill;ME <br /> s_ <br />