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l <br /> 20 March 2006 <br /> AGE-NC Project No. 03- 1071 <br /> Page 8 of 13 <br /> operation (after the restart); due to an equipment malfunction, the test was terminated after 125 <br /> minutes of operation. No significant draw-down was recorded in observation well MW-4 (53 . 5 ft <br /> away from EW- 1 ); MW- 1 through MW-3 showed very slight draw-downs of between 0 .02 and <br /> 0 .04 It (19.5 to 26 It away from EW- 1 ). <br /> Utilizing the maximum draw-down data collected during the first ( 1 GPM) and second (0.75 GPM) <br /> stages of the pump test, a plot of EW- 1 draw-down for pumping rates was generated; from the plot, <br /> a best fit line was projected between the data points that estimated the maximum draw-down at <br /> EW- 1 at specific pumping rates (Appendix H) . Results of the ground water aquifer ` step' pumping <br /> test are summarized in Table 3 . <br /> 3 .2 . CONSTANT RATE GROUND WATER PUMPING TEST <br /> Due to the poor well-response to the variable rate groundwater pumping test, the 24fiour constant <br /> rate test proposed in the AGE-prepared Interim Remediation Feasibility Testing and Well <br /> Installation Work Plan-Addendum, dated 15 June 2005, was cancelled. <br /> i <br /> 3 .3 . EXTRACTED WATER SAMPLING PROCEDURES <br /> Approximately 160 gallons of extracted ground water was generated from the 29 August 2005 <br /> ground water aquifer pump testing activities . Prior to discharge into the 10,000-gallon Baker tank, <br /> grab ground water samples were collected at the 15-minute time interval (0915 hr), and at the 180 <br /> minute time interval ( 1200 hr) utilizing four 40-m1 EPA-approved volatile organic analysis (VOA) <br /> vials containing 0.5 ml 18% hydrochloric acid as a sample preservative. Following sample <br /> collection, each preserved sample was logged on a chain-of-custody form, placed in a chilled <br /> container and transported to a California Department of Health Services (DHS)-certified laboratory <br /> for analysis for: <br /> • TPH-g by EPA Method 5030/8015Cm; <br /> j BTEX and MTBE by EPA Method 8021B ; and <br /> i <br /> • MTBE, TAME, DIPE, ETBE and TBA, 1 ,2-DCA, and EDB by EPA Method 8260B. <br /> jl <br /> i <br /> i <br /> i <br /> Advanced GeoEnvironmental, Inc. <br /> t <br /> i <br />