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The water level measurements were also used to calculate the required purge volumes for the <br /> monitor wells From these measurements the standing water volume within the well casing was <br /> calculated to determine the necessary purge volume of three times the casing volume. A clean <br /> PVC bailer was then lowered into the well. A minimum of three casing volumes was removed <br /> from each well prior to sampling. Monitor well purge data is summarized in Table A-2 <br /> TABLE A-2 <br /> Monitor Well Purge Data <br /> tAugust 12 and 13, 1993 <br /> 1 Well/Sample Total Depth Depth to Water 3 Purge Volumes Purge Volume <br /> (feet)` (feet, BGS) (gal) (gal) <br /> MW-4 6452 4991 284 325 <br /> MW-5 6266 48 13 28 3 285 <br /> MW-6 5900 49 12 193 20 <br />' MW-7 6508 5095 275 275 <br /> MW-8 6525 1 5148 1 268 1 27 11 <br />' 1 Measured from top of PVC casing (TCC) <br /> At the beginning, during and end of the purge process, measurements were taken for pH, <br /> electrical conductivity and temperature of the purge water This information was also recorded <br /> on field water sampling data sheets and final values are presented in Table A-3 Upon <br />' completion of the purge, the pump assembly was removed from the well to allow sampling with <br /> a bailer <br /> I TABLE A-3 <br /> Field Water Quality Measurements <br /> End of Purge Values <br />' August 12 and 13, 1993 <br /> Well/Sample pH' Temperature (°F) Conductivity (umhos) <br /> IMW-4 70 699 1,200 <br /> MW-5 70 727 652 <br /> MW-6 70 732 1,347 <br /> MW-7 70 756 1,146 <br /> MW-8 70 71 7 1,153 <br /> I1 pH paper used <br /> MxWFrswC 3RD WP A - 2 1011y93 <br />