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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. <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 Tess 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. <br />Page B-11 Natural Soda LLC 2015 S A P <br />