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A �. Should the well pump dry after the initial casing dewatering the pump will be turned off and the well allowed to recover for con- tinued pumping to obtain the desired purge volume. Field parameters of pH, temperature, and electrical conductance will be measured during each well purging. Measurements will be taken and recorded approximately every five gallons. If any of the three field parameters has not stabilized by the time the 4-6 casing volumes have been purged, additional well water will be pumped until the parameters have stabilized (but no more than 10 casing volumes ) . "Stabilized" is defined as a reading within 10 percent of a previous reading. All purge water will be contained in 55-gallon drums labeled with well number, date, contents; and facility name. After the well has been purged of the required volume of water, the pump will be removed. A Teflon sampling bailer will be used to collect four sEparate samples for presample field parameters to ensure para- meter stability and, therefore, representative aquifer samples. 4 . 6. 4 Wel?. Sam lin All samples will be collected with a 'teflon bailer cleaned as discussed in Section 4.6. 1 . The bailer will be operated by hand on a new, 9 /4--inch polypropylene rope. The samplers will wear clean Nitrile gloves during sampling operations and while handling sample bottles. Domestic wells will be sampled from the faucet closest to the well after allowing a free water flow of sufficient volume to provide an aquifer sample. The collected groundwater samples will be emptied from the bailer with a bottom-emptying device directly into the sample bottles. The samples will be collected in two 40-m1 glass VOA vials with 'ref.lon-lined septum caps. The sample bottles will contain hydro- chloric acid as a preservative. The samples will be contained in the vials free of headspace ( i.e. , no air bubbles the vial ) . c5l /97780/6-90/tx 11