ARCHIVED REPORTS FIRST QUARTER GROUNDWATER MONITORING REPORT FEBRUARY 2014

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Pilkington North America,Inc. Site Background ' Page 8 of 13 Three diesel recovery and skimmer O/M events were conducted at the Site between August 29 and September 11, 2008. Free product was observed in RW-2 and RW-3, but no product was recoverable ' during the monitoring and skimming period. Product recovery from the Site's recovery wells has produced a cumulative total of approximately 182.01 gallons of recovered diesel. t During the fourth quarter 2008 groundwater monitoring event conducted on November 25 and December 1, 2008, Condor sampled the three Site monitoring wells and the two facility sumps. The average groundwater elevation measured in the three monitoring wells decreased by approximately 0.52 feet since ' the previous monitoring event. The calculated groundwater gradient was approximately 0.0029 ft/ft to the northeast. None of the constituents of concern were detected at or above laboratory-reported detection limits in MW-1. TPH-D was detected in MW-2 (0.0727 mg/L) and MW-3 (0.0726 mg/L), and in the ' SW-sump(0.919 mg/L)and SE-sump (0.380 mg/L). One diesel recovery and skimmer O/M event was conducted at the Site between September 12 and ' December 1, 2008. Free product was observed in recovery wells RW-2, RW-3, RW-4, and RW-6, but no product was recovered during the monitoring and skimming period. Product recovery from the Site's recovery wells has produced a cumulative total of approximately 182.01 gallons of recovered diesel. ' During the first quarter 2009 groundwater monitoring event conducted on February 18 and 20, 2009, Condor sampled the three Site monitoring wells and two facility sumps. The average groundwater elevation measured in the three monitoring wells increased by approximately 0.61 feet since the previous ' event. The calculated groundwater gradient was approximately 0.0021 ft/ft to the east. None of the constituents of concern were detected at or above the laboratory reported detection limits in MW-1. Laboratory analytical results indicate that low concentrations of TPH-D were detected in monitoring ' wells MW-2 and MW-3 and the SE-Sump; TPH-MO was detected in the groundwater sample collected from the SW-Sump. ' Six diesel recovery and skimmer O/M events were conducted at the Site between December 2, 2008 and March 30, 2009. Free product was observed in recovery wells RW-2, RW-3, and RW4, and approximately 4.57 gallons of product were recovered during the monitoring and skimming period. Product recovery from the Site's recovery wells has produced a cumulative total of approximately 186.58 gallons of recovered diesel. During the second quarter 2009 groundwater monitoring event conducted on May 18 and 22, 2009, ' Condor sampled the three Site monitoring wells and two facility sumps. The average groundwater elevation measured in the three monitoring wells increased by approximately 0.08 feet since the previous monitoring event. The calculated groundwater gradient was approximately 0.0028 ft/ft to the northeast. ' None of the constituents of concern were detected at or above the laboratory reported detection limits in MW-1. Laboratory analytical results indicate that low concentrations of TPH-D were detected in monitoring wells MW-2 and MW-3 and both facility sumps. ' Ten diesel recovery and skimmer O/M events were conducted at the Site between April 1, 2009 and June 29, 2009. Free product was observed in recovery wells RW-1, RW-2, RW-3, and RW-4, and ' approximately 3.74 gallons of product were recovered during the monitoring and skimming period. Product recovery from the Site's recovery wells has produced a cumulative total of approximately 190.32 gallons of recovered diesel. ' During the third quarter 2009 groundwater monitoring event conducted on August 10 and 11, 2009, Condor sampled the three Site monitoring wells and two facility sumps. The average groundwater elevation measured in the three Site monitoring wells on August 10, 2009, decreased by approximately 1