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Pilkington North America,Inc.
<br /> Site Background
<br /> Page 4 of 13
<br /> survey are included in the First Quarter Groundwater Monitoring Report —February and March 2005
<br /> dated May 24, 2005.
<br /> ' Four diesel recovery events were conducted at the Site from April 18, 2005 through May 12, 2005. Free
<br /> product was observed in four recovery wells (RW-2, RW-3, RW-4, and RW-6). A total of 0.92 gallons of
<br /> product was recovered during the second quarter 2005. A cumulative total of approximately 142.59
<br /> gallons of diesel was recovered from the Site's recovery wells since skimming operations commenced in
<br /> June 1999.
<br /> ' During the second quarterly monitoring event conducted at the Site on May 12 and 13, 2005, Condor
<br /> sampled two sumps (SE sump and SW sump) and three monitoring wells (MW-1, MW-2, and MW-3).
<br /> ' Groundwater elevation measurements collected on May 12, 2005 indicated an average depth to
<br /> groundwater of 12.81 feet below well collar survey points. The average groundwater elevation on May
<br /> 12, 2005 decreased 0.34 feet since the previous monitoring event on February 8, 2005. The calculated
<br /> ' groundwater gradient on May 12, 2005 was 0.0032 ft/ft to the northeast. TPH-D, TPH-K, and TPH-MO
<br /> were not detected at or above the laboratory reported detection limits in monitoring wells MW-1, MW-2,
<br /> or MW-3. TPH-D was detected in the SW sump.
<br /> ' Thirteen diesel recovery events were conducted at the Site from May 20, 2005 through August 18, 2005.
<br /> Free product was observed in four recovery wells (RW-2, RW-3, RW-4, and RW-6). Approximately 7.7
<br /> gallons of diesel siphoned out of the product recovery tank back into RW-4 between the May 12 and May
<br /> ' 20 monitoring events when a piece of debris prevented the solenoid valve from closing. All of the
<br /> siphoned diesel was subsequently recovered and a total of 8.77 gallons of product was recovered during
<br /> the third quarter 2005. A cumulative total of approximately 143.66 gallons of diesel have been recovered
<br /> ' from the Site's recovery wells since skimming operations commenced in June 1999.
<br /> During the third quarterly monitoring event conducted at the Site on August 17 and 18, 2005, Condor
<br /> ' sampled two sumps (SE sump and SW sump) and three monitoring wells (MW-1, MW-2, and MW-3).
<br /> Groundwater elevation measurements collected on August 17, 2005 indicated that the average
<br /> groundwater elevation decreased 1.72 feet since the previous monitoring event. The calculated
<br /> groundwater gradient was 0.003 ft/ft to the southeast. TPH-D, TPH-K, and TPH-MO were not detected at
<br /> or above the laboratory reported detection limits in monitoring wells MW-1, MW-2, MW-3, or the SE
<br /> sump. TPH-D was detected in the SW sump at 1.42 mg/L.
<br /> Six diesel recovery and skimmer operations and maintenance (O/M) events were conducted at the Site
<br /> from August 26, 2005 through November 9, 2005. Free product was observed in four recovery wells
<br /> (RW-2, RW-3, RW-4, and RW-6). A total of approximately 5.19 gallons of product was recovered during
<br /> ' the monitoring and recovery period. Product recovery from the Site's recovery wells has produced a
<br /> cumulative total of approximately 148.85 gallons of recovered diesel.
<br /> ' On November 8, 2005, a Condor representative measured water levels at monitoring wells MW-1, MW-2,
<br /> and MW-3 and recovery wells RW-1 through RW-6. On November 9, 2005, Feld observations were
<br /> recorded at the monitoring wells and groundwater samples were collected for laboratory analyses from
<br /> ' MW-1 through MW-3 and the SE and SW facility sumps. No petroleum hydrocarbon odors, petroleum
<br /> hydrocarbon sheen or separate phase petroleum were noted in the field inspection samples collected from
<br /> the monitoring wells. The average groundwater elevation measured in the three Site monitoring wells on
<br /> ' November 8, 2005 decreased by 0.16 feet since the previous monitoring event conducted on August 17,
<br /> 2005. The estimated groundwater gradient was calculated to be 0.0027 ft/ft to the east-northeast. TPH-D
<br /> was detected in the SW sump at 2.44 mg/L and at 0.106 mg/L in MW-2.
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