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October 2000 4 <br />. decontaminated prior to each sample location or dedicated sampling pumps. This equipment will <br />be constructed of materials that will not alter the quality of the groundwater samples. All of the <br />groundwater purging and sampling equipment will be maintained in a clean and working <br />condition. Sampling personnel will wear new disposable gloves, constructed of appropriate <br />material, while handling the sampling equipment. If any equipment decontamination is required, <br />it will be performed as follows: <br />- Wash with aphosphate-free soap and water solution; <br />- Rinse with tap water (intermediate rinse); and <br />- Rinse with de-ionized or distilled water (final rinse). <br />Immediately prior to sample collection, each well will be purged of stagnant water using the <br />dedicated or disposable sampling equipment. If purging and sampling is performed with <br />. dedicated bladder pumps, low-flow methodology will be utilized. This methodology consists of <br />setting the pump intake in the screened interval of the well and pumping at a rate equivalent to <br />or less than the recharge rate (typically between 0.1 and 0.5 liters per minute). This technique <br />reduces the purge volume required to obtain a sample representative of surrounding groundwater <br />quality conditions, but requires that water levels be measured during purging so the water does <br />not drop below the pump intake. If bailers are used for purging and sampling, Hater will be <br />purged from the well until a minimum three well volumes have been removed or until the well <br />goes dry (insufficient water remains to allow pumping), whichever occurs first. Bailing will <br />be performed at a rate that will minimize agitation of recovery waters. <br />Prior to purging and when low-flow methodology is not utilized, a purge volume for each well <br />will be calculated as follows: <br />• <br />I:1pgI1911I191G9/SAPREV1009.DOC Sedalia Rerycling Cenfer and Depository <br />