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• CLUSTER WELL DEVELOPMENT MW6 A-B, MW7 A-B AND RI A-B,.APRIL 13, 2001 The newly installed A Zone cluster wells were developed approximately 72 hours after placement of the neat cement sanitary seals Prior to development two measurements were obtained from each well top of groundwater depth and base of well depth Then the 2 inch diameter wells were surged with a two inch diameter surge block and the 4 inch diameter well was surged with a four inch diameter surge block across the screened interval for approximately five minutes The dwells were purged of approximately 8 to 10 gallons of water and then surged for another 5 minutes prior to purging another 8 to 10 gallons of water This surging and purging occurred three times per well, removing 30 gallons of water from RIA, 24 gallons from MW6A and 24 gallons from MW7A The newly installed B Zone cluster wells were also developed approximately 72 hours after placement of the neat cement sanitary seals Prior to development two measurements were obtained from each well top of groundwater depth and base of well depth Then the 2 inch diameter wells were surged with a two inch diameter surge block and the 4 inch diameter well was surged with a four inch diameter surge block across the screened interval for approximately five minutes The wells were purged of approximately 8 to 20 gallons of water and then surged for another 5 minutes prior to purging another 8 to 20 gallons of water This surging and purging occurred three times . per well, removing 60 gallons of water from RIA, 30 gallons from N4W6A and 25 gallons from MW7A, see Appendix D-well development field notes ` DEPTH TO WATER MEASUREMENTS Depth to water was measured at all wells on April 18, 2001 The measurements were made from the surveyed elevation at the top of casing at each well using an electrical air/water interface probe (Table 1) No free product or product sheen was observed in any of the monitor wells COLLECTION AND CERTIFIED ANALYSIS OF GROUNDWATER SAMPLES WEGE and Putman Well Purging (PWP) personnel collected quarterly groundwater samples from the eleven monitor wells at the site on April 18, 2001 See Appendix E for QA/QC, details, methods, procedures, abbreviations, and acronyms used in sampling and analysis Following depth to water measurements, WEGE and PWP personnel used a truck mounted vacuum lift pump and dedicated one inch diameter PVC tubing to purge each well of three volumes of water 11 Sanchez 2nd QM 2001