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GROUND WATER SAMPLING PROTOCOL In ground-water sampling, it is essential that the represent conditions existing in the aqn the well. uifer sample in water quality characteristics 'Often lexist between the water in the well and the surrounding aquifer, particularly in wells used intermittently or infrequently, such as wells. To obtain a representative sample of the well monitoring is purged until selected water qualityaquifer, the stabilized. The parameters should parameters conductivityinclude become obtained ' and temperature. Once consistentereadings l the discharge should represent formation water rather than potentially stagnant water in the well. should amount to three to five casing volumes. A casing volume is based on actual measurements made on the da The purge volume Prior to sampling Y of sampling. depth of sampling theld be measured. the static water level and total stabilized measured. The purged volume be recorded readings for pH, conductivity, with If the well is emptied before nfive temperature shall are removed, the sample shall be taken when waterclevel in the well recovers to lasing volumes at least 80 percent of its initial water level. Following the required volume of evacuation from the well, the ailer. sample shall be obtained with a teflon or stainless steel b Care shall be taken to properly clean the sampling events. Air lift bailer line between sampling shall not be used. Unless specifically waived or changed by the local, prevailing regulatory agency, water samples shall be handled and preserved according to the latest EPA methods as described in the Federal Register (Volume 44, No. 233, Monday, December 3, 1979, Page 69544, Table II) for the type of analysis to be performed. Purged water will be properly disposed of or temporarily in an appropriate storage container pending chemical analyses needed to designate placed proper disposal procedure.