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GeoHydrologic Consultants, Inc • 03/24/05 (multi-phase extraction test, EW-5S) • average TPHg concentration of 2,301 ppm, ' • average MTBE concentration of 1 11 ppm, • average benzene concentration of 16 4 ppm, ' • average flow rate of 102 cfm, approximately 29 13 pounds of hydrocarbon removed—extraction rate 87 4 pounds of hydrocarbon per day A total of 29 13 pounds of TPHg, 0 1652 pounds of benzene, and 0 0139 pounds of MTBE were removed and destroyed during the multi-phase extraction pilot test performed on EW-5S (Table 8) These correspond to removal rates of 87 4 pounds per day of TPHg, 0 496 pounds per day of benzene, and 0 0379 pounds per day of MTBE The cumulative totals for the combined multi-phase extraction tests performed on EW- 5D and EW-5S were 29 47 pounds of TPHg, 0 1791 pounds of benzene, and 0 0151 pounds of MTBE (Table 8) 6.0 AQUIFER TESTING 6.1 Description ' Two, 12-hour constant rate aquifer tests were perfonned on wells EW-5D (12-hours) and EW-5S (12-hours) on March 31 and April 6, 2005, respectively Monitoring wells EW- 5S, MW-4, TB-10, and TB-7 were used as observation wells during the pumping test on EW-51), and wells EW-513, MW-4, TB-10, and TB-7 were used during the pumping test on EW-5S Prior to conducting the pumping tests, the static water level was measured in ' the pumping well and observation wells using a 200 foot Solinst stainless-steel water level meter Depth to water was measured in extraction wells EW-5D and EW-5S and the surrounding monitoring wells to the nearest 0 01 foot interval both at the beginning and ' throughout the tests The pumping tests were conducted using a two-inch stainless-steel variable speed ' submersible Grunfos pump which was decontaminated by washing with non-phosphate detergent and triple rinsed with distilled water One new 50-foot garden hose and one decontaminated 50-foot garden hose was connected to the pump and the pump was ' lowered in the well to a depth of approximately 83 feet in well EW-5D (total depth of well 85 feet below top of casing), and to a depth of 58 feet (total depth of well 60 feet below top of casing) and tied off at that depth at the surface with a rope The purge water ' discharged from the hose was placed in a 4,000-gallon polyethylene Baker Tank All water generated during the test was vacuum trucked from the tank and properly . recycled/disposed r TOC 171 Pilot study Page 15