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' Pilkington North America,Inc. <br /> Site Background <br /> ' Page 9 of 13 <br /> 0.70 feet since the previous monitoring event conducted on May 18, 2009. The calculated groundwater <br /> ' gradient was approximately 0.0030 ft/ft to the east. <br /> None of the constituents of concern were detected at or above the laboratory-reported detection limits in <br /> MW-1, MW-3, or the SE-sump. Laboratory analytical results indicated that low concentrations of TPH-D <br /> ' were detected in monitoring well MW-2 and the SW-sump. <br /> Eight diesel recovery and skimmer O/M events were conducted between July 1 and September 30, 2009. <br /> Free product was observed in recovery wells RW-1, RW-2, RW-3, RW-4, and RW-6, and approximately <br /> 3.63 gallons of product were recovered during the monitoring and skimming period. Product recovery <br /> from the Site's recovery wells has produced a cumulative total of approximately 193.95 gallons of <br /> ' recovered diesel. <br /> Condor sampled the three Site monitoring wells and two facility sumps during the fourth quarter 2009 <br /> ' groundwater monitoring event conducted on November 16 and 19, 2009. The average groundwater <br /> elevation measured in the three Site monitoring wells on November 16, 2009, decreased by approximately <br /> 0.47 feet since the previous monitoring event on August 10, 2009. The calculated groundwater gradient <br /> ' was approximately 0.0030 ft/ft to the northeast. <br /> None of the constituents of concern were detected at or above the laboratory-reported detection limits in <br /> the three Site monitoring wells. Laboratory analytical results indicated that low concentrations of TPH-D <br /> ' were detected in the SW-and SE-sumps. <br /> Five diesel recovery and skimmer O/M events were conducted at the Site between October 1 and <br /> ' December 31, 2009. Free product was observed in recovery wells RW-1, RW-2, RW-3, RW-4, and <br /> RW-6, and approximately 1.68 gallons of product were recovered during the monitoring and skimming <br /> period. Product recovery from the Site's recovery wells has produced a cumulative total of approximately <br /> ' 195.63 gallons of recovered diesel. <br /> Condor sampled the three Site monitoring wells and two facility sumps during the first quarter 2010 <br /> ' groundwater monitoring event conducted on February 10 and 11, 2010. The average groundwater <br /> elevation measured in the three Site monitoring wells on February 10, 2010, increased by approximately <br /> 0.43 feet since the previous monitoring event on November 16, 2009. The calculated groundwater <br /> ' gradient was approximately 0.003 ft/ft to the northeast. <br /> None of the constituents of concern were detected at or above the laboratory-reported detection limits in <br /> MW-1 or MW-3. Laboratory analytical results indicated that low concentrations of TPH-D were detected <br /> ' in MW-2 and the SW-and SE-sumps. <br /> Five diesel recovery and skimmer O/M events were conducted at the Site between January 1 and March <br /> ' 31, 2010. Free product was observed in recovery wells RW-2, RW-3, RW-4, and RW-6, and <br /> approximately 4.84 gallons of product were recovered. Product recovery from the Site's recovery wells <br /> has produced a cumulative total of approximately 200.47 gallons of recovered diesel. <br /> ' Condor sampled the three Site monitoring wells and two facility sumps during the second quarter 2010 <br /> groundwater monitoring event conducted on May I1 and 12, 2010. The average groundwater elevation <br /> ' measured in the Site monitoring wells on May 11, 2010, increased by 1.03 feet since February 10, 2010. <br /> The calculated groundwater gradient was approximately 0.003 1t/ft to the northeast. Laboratory analytical <br /> results indicated that none of the constituents of concern were detected in the three Site monitoring wells. <br /> Low concentrations of TPH-D were detected in the facility sumps. <br /> 1 <br />