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_ <br /> l using the depth to water and total well depth measurement, the <br /> volume of standing water in the well and tl-.e required purge <br /> r. volume was calculated and recorded on a standardized well sam- <br /> pling log sheet. The same pump used for devel.opi'ag the wells was <br /> used to purge them. Table: B-1 summarizes the groundwater sam- <br /> pling data for August 19, 1988. <br /> Table B-1 Monitor Well Purge Data <br /> ` Total Depth to 3 Purge Flow Purge Purge <br /> Well Depth Water Volumes Rate Time Volume <br /> 62.1' 56.04 ' 11.9 gal 2.3 GPM 8 min 18.1 gal <br /> MW-2 64.71 55.26' 18.5 gal 3.3 GP*I 11 min 36.3 gal <br /> -3 64.7' 52.62' 23.7 gal 14.3 GPM 5 min 71.4 gal <br /> Note: The total depth was measured on July 29, 3.988 during the <br /> first sampling. <br /> More than the minimum of three standing well casing volumes was <br /> purged prior to collection of the samples, As the water column <br /> in the wells was on the ori c_r of 10 to 12 feet in height, the <br /> Pump was set approximately 2 feet above the bottom of the well <br /> during the purge. Also, the flow rate was restrict9d at MW-1 and <br /> MW-2. This was done to reduce the possibility of drawing the <br /> water column down to the pump intake and thereby potentially <br /> aerating the groundwater immediately prior to sampling for <br /> volatiles. MW-3, having a longer water column and a high yield <br /> during development was purged at the pumps maximum flow rate. in <br /> the last moments of well purging, the pH, temperature, and <br /> conductivity of the water was measured and recorded. The infor- <br /> '�' nation for August 19, 1988 is summarized in Table B-2. <br /> � .' Table B-2 Field Water Quality Measurements <br /> Temperature Conductivity <br /> Well PH (degrees-e) micromhoAj <br /> MW-1 7.3 24.5 1333 <br /> MW-2 7.4 22.6 121.7 <br /> MW-3 7.4 21.3 1160 <br /> ,.. <br /> A record of the purging activities, including the volume of water <br /> purged, -the pump discharge rate, and the start and finish time of <br /> purging was maintained in the field log book and on the sample <br /> log sheet. Appendix E - Water Sampling Logs presents the well <br /> log sheets containing the well specific data- - - - - field. - - - -- - - --- - -- - <br /> C - 5 <br />