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<br /> Pilkington North America,Inc.
<br /> Site Background
<br /> Page 2 of 13
<br /> First, second, third, and fourth quarter, 2002 quarterly groundwater monitoring activities were conducted
<br /> ' by Condor at the site on February 11, May 14, August 13 and 14, and November 11 and 12, 2002,
<br /> respectively. Condor prepared reports for the monitoring events dated April 3, June 27, October 25, 2002
<br /> and January 15, 2003. The groundwater gradient estimated during the 2002 groundwater monitoring
<br /> events fluctuated from southeast to northeast and was consistent with the range of historical groundwater
<br /> ' gradients estimated for the site since monitoring events was initiated on June 21, 1999.
<br /> During the first and second quarter 2002 monitoring events, groundwater samples collected from the
<br /> ' monitoring wells and sumps were analyzed for benzene,toluene, ethyl benzene, and total xylenes (BTEX)
<br /> and for total extractable petroleum hydrocarbons (TEPH) quantified as diesel, kerosene, and motor oil. In
<br /> addition, during the first quarter 2002, groundwater samples collected from RW-1, MW-2, and MW-3 for
<br /> ' natural attenuation monitoring were analyzed for total alkalinity, nitrate, sulfate, and ferrous iron. During
<br /> the first and second quarter 2002 monitoring events, BTEX and TEPH groundwater sample analytical
<br /> results were generally consistent with historical laboratory analytical results. Monitoring of groundwater
<br /> samples for natural attenuation parameters was discontinued in the second quarter 2002. Monitoring of
<br /> groundwater samples for BTEX was discontinued in the third quarter 2002. During the third and fourth
<br /> quarter 2002 monitoring events, groundwater samples collected from the monitoring wells and sumps
<br /> ' were analyzed for total petroleum hydrocarbons quantified as diesel (TPH-D), kerosene (TPH-K), and
<br /> motor oil (TPH-MO). Groundwater sample analytical results for TPH during the third and fourth quarter
<br /> 2002 monitoring events were consistent with historical laboratory analytical results.
<br /> ' Results of the monthly skimming were included in the 2002 quarterly groundwater monitoring reports.
<br /> Monthly diesel skimming operations continued at RW-2 and RW-4 with an annual recovery of
<br /> approximately 20.55 gallons of product and a cumulative product removal total of 35.55 gallons.
<br /> ' First and second quarter 2003 quarterly groundwater monitoring activities were conducted by Condor at
<br /> the site on February 10 and 11, and May 12 and 13, 2003, respectively. Condor prepared reports for the
<br /> ' monitoring events dated March 26, and May 12, 2003. The east/southeast groundwater gradient estimated
<br /> during the first and second quarter 2003 groundwater monitoring events was consistent with the range of
<br /> historical groundwater gradients estimated for the site since monitoring events was initiated on June 21,
<br /> 1999. Groundwater sample analytical results for TPH during the first and second quarter 2003 monitoring
<br /> events were consistent with historical laboratory analytical results.
<br /> ' Monthly diesel skimming operations continued at RW-3 and RW-4. Results of the monthly skimming
<br /> were included in the 2003 quarterly groundwater monitoring reports. At the end of the second quarter
<br /> 2003, a cumulative product removal of 85.2 gallons was estimated for the site.
<br /> ' Third and fourth quarter 2003 quarterly groundwater monitoring activities were conducted by Condor at
<br /> the site on August 19 and December 8, 2003, respectively. Condor prepared reports for the monitoring
<br /> events dated September 18, 2003 and January 14, 2004. The east/southeast groundwater gradient during
<br /> ' the third and fourth quarter 2003 groundwater monitoring events was consistent with the range of
<br /> historical groundwater gradients estimated for the site. TPH-D was detected in the groundwater samples
<br /> collected from MW-2 and the SW Sump during the December 8, 2003 monitoring event; this was the first
<br /> ' time TPH-D has been detected in MW-2 since May 24,2000.
<br /> Diesel skimming operations were generally inactive during the third and fourth quarter due to insufficient
<br /> ' groundwater levels in the recovery wells. Free product (approximately 0.5 gallons) was removed from
<br /> recovery well RW-6 for the first time on December 8, 2003. Results of the monthly skimming events
<br /> were included in the September 18, 2003 and January 14, 2004 monitoring reports. At the end of the
<br /> fourth quarter 2003,a cumulative product removal of 111.7 gallons was estimated for the site.
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