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accumulated contaminants, residue, silt, soot, dust etc. This will assure that the samples are <br /> free of such material as may accumulate on the sampling equipment itself between uses. <br /> B.5.2. Bladder Pumps <br /> Most bladder pumps cannot be easily decontaminated in the field due to their unique <br /> construction. For that reason bladder pumps are not employed for sampling on a well-to-well <br /> basis unless they are constructed with easy to clean parts and disposable bladders. Bladder <br /> pumps with non-disposable bladders are best suited for dedicated (permanently installed) <br /> scenarios. NS does not currently use bladder pumps. <br /> B.5.3. Discharge Tubing <br /> Decontamination is impracticable for wells that have dedicated discharge tubing running up <br /> and out of the well. A concern is the potential precipitation and/or concentration, due to <br /> evaporation, of analytes between sampling events. A cap over the tubing end should retard <br /> fluid evaporation. <br /> B.5.4. Freeze protection <br /> During periods of below freezing weather, purging the fluid from the end of the discharge line <br /> may be appropriate. This micro-purge might be accomplished with a length of reasonably rigid <br /> tubing whose OD is less than the ID of the discharge line. Insert the decontaminated micro- <br /> purge tubing into the discharge tubing far enough to place the end at an appropriate depth <br /> below ground surface (consider 8-12 feet BGS). Slowly add a very minor amount of pressure to <br /> blow the fluid out of the end portion of the discharge tubing then cap the end of the discharge <br /> tubing. <br /> Daub&Associates, Inc. Page B-11 Natural Soda LLC 2022 SAP <br />