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17"ri7m <br /> 11 <br /> S fEC ® R JI <br /> 7-Eleven Store#32262 <br /> Extended Groundwater Pumping Test and Oxygen Injection Feasibility Study <br /> November 10, 2005 <br /> Page 8 <br /> Since the Increase in DO observed In EX-1 was 0 2 mg/L-, the radius of Influence (ROI) for-- <br /> oxygen Injection (less than 5 feet), determined during the original oxygen injection feasibility <br /> test (June 21, 2004), appears to be accurate Because of the nominal ROI, oxygen <br /> Injection does not appear to be a feasible remedial alternative for this site <br /> Field notes for the oxygen Injection feasibility test are in Attachment C <br /> SUMMARY AND CONCLUSIONS <br /> On September 12 through 16, SECOR conducted step drawdown and extended pump tests <br /> by extracting groundwater from extraction well EX-1 The average pumping rate during the <br /> event was 0 74 gpm, and a total of 3,570 gallons of groundwater was extracted over <br /> approximately 86 hours Approximately 0 008 pounds of TPHg and 0 022 pound of MtBE <br /> were removed from groundwater during the test Groundwater level fluctuations (0 03 to <br /> 0 06 feet) that occurred during the pumping test in monitoring wells S-1, MW-5, and MW-4 <br /> do not appear to be the result of pumping from well EX-1 Based on well EX-1 drawdown <br /> data, the calculated transmissivity is 307 gallons per day per foot, the hydraulic conductivity <br /> is 19 feet per day, and the effective radius of capture would be approximately 180 feet If <br /> well EX-1 were efficient <br /> On August 10-12, 2005, SECOR conducted an oxygen Injection feasibility test using <br /> oxygen injection well S-1 Based on negligible Increases in DO, the determined radius of <br /> Influence (ROI) for oxygen injection was confirmed to be less than 5 feet Because of the <br /> nominal ROI, oxygen Injection does not appear to be a feasible remedial alternative for this <br /> site <br /> If you have any questions regarding the contents of this submittal, please contact Mr Steve <br /> Strait at (559) 271-2650 extension 222 or Mr Damon Brown (916) 861-0400 extension 230 <br /> Sincerely, <br /> SECOR International Incorporated <br /> Damon Brown Steve Strait, P G , CEG , C HG <br /> Project Geologist Principal Hydrogeologis <br /> ZOc <br /> No HG123 <br /> ,4 Exp <br />• q�OFC <br /> AL\FflC <br /> C\Documents and Settings\sstraiftocal Settmgs7emporary Internet Fdes\01-1<1314\32262 Pump Test and 02 Feasibility 11- <br /> 10-05 doc SECOR Internatrona!Incorporated <br />