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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 Monitoring well purge data is summarized in Table A-2 <br /> TABLE A-2 <br /> Monitoring Well Purge Data <br /> June 3 and 4, 1993 <br /> Well/Sample Total Depth Depth to Water 3 Purge Volumes Purge Volume <br /> (feet)' (feet, BGS) (gal) (gal) <br /> MW-4 6452 4990 285 29 <br /> MW-5 6266 4806 285 285 <br /> MW-6 5900 49 13 192 195 <br /> MW-7 6508 50 88 277 28 <br /> MW-8 6525 51 33 27 1 275 <br /> 1 Measured from top of PVC casing (TOC) <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 /> TABLE A-3 <br /> Field Water Quality Measurements <br /> End of Purge Values <br /> June 3 and 4, 1993 <br /> Well/Sample pH Temperature ff) Conductivity (umhos) <br /> MW4 7 7 67 1 1326 <br /> MW-5 7 6 769 938 <br /> MW-6 74 682 1710 <br /> MW-7 87 68 1 1601 <br /> MW-8 74 666 1 1257 <br />' M\RPTSWC 2ND WP A - 2 07/48/93 <br />