|
Pilkington North America,Inc.
<br /> Site Background
<br /> ' Page 5 of 13
<br /> Eight diesel recovery and skimmer O/M events were conducted at the Site from November 18, 2005
<br /> ' through February 28, 2006. Free product was observed in recovery wells RW-2, RW-3, RW4, and RW-
<br /> 6. A total of approximately 15.59 gallons of product was recovered during the monitoring and recovery
<br /> period. A cumulative total of approximately 164.44 gallons of diesel have been recovered from the Site's
<br /> recovery wells since skimming operations commenced in June 1999.
<br /> tDuring the first quarterly monitoring event conducted at the Site on February 28, 2006, Condor sampled
<br /> monitoring wells MW-1, MW-2, and MW-3, and the SE sump and SW sump. Groundwater elevation
<br /> ' measurements collected on February 28, 2006 indicated that the average groundwater elevation increased
<br /> by 1.52 feet since the previous monitoring event. The calculated groundwater gradient was 0.0032 ft/ft to
<br /> the east. TPH-D, TPH-K, and TPH-MO were not detected at or above the laboratory reported detection
<br /> ' limits in monitoring wells MW-1, MW-3, or the SE sump. TPH-D was detected in MW-2 and the SW
<br /> sump at 0.133 mg/L and 2.80 mg/L, respectively.
<br /> 1 Nine diesel recovery and skimmer O/M events were conducted at the Site from March 9, 2006 through
<br /> May 25, 2006. Free product was observed in four recovery wells (RW-2, RW-3, RW-4, and RW-6). A
<br /> total of approximately 7.67 gallons of product was recovered during the monitoring and recovery period.
<br /> ' Product recovery from the Site's recovery wells has produced a cumulative total of approximately 172.11
<br /> gallons of recovered diesel.
<br /> During the second quarter groundwater monitoring event conducted on May 25, 2006, Condor sampled
<br /> ' monitor wells MW-1, MW-2, and MW-3, and the SE sump and SW sump. Groundwater elevation data
<br /> collected the same day indicated that the average groundwater elevation had increased by 1.09 feet since
<br /> the February 28, 2006 monitoring event. The calculated groundwater gradient was 0.009 ft/ft to the south.
<br /> The bottle containing the sample collected from monitoring well MW-1 was broken at the laboratory, and
<br /> consequently another sample was collected from monitoring well MW-1 on June 1, 2006. TPH-D was
<br /> detected in MW-2 and the SW sump at concentrations of 0.108 mg/L and 2.38 mg/L, respectively.
<br /> During the third quarter groundwater monitoring event conducted on August 14 and 15, 2006, Condor
<br /> sampled the three on-site monitoring wells and the SE sump and SW sump. Groundwater elevation data
<br /> ' collected on August 14, 2006 indicated that the average groundwater elevation had decreased by 0.50 foot
<br /> since the May 25, 2006 event. The calculated groundwater gradient was approximately 0.003 ft/ft to the
<br /> east. TPH-D was detected in MW-2 and the SW sump at 0.208 and 2.40 mg/L, respectively, and TPH-
<br /> , MO was detected in the SW sump at a concentration of 0.517 mg/L.
<br /> Eight diesel recovery and skimmer O/M events were conducted at the site from June 1, 2006 through
<br /> August 14, 2006. Free product was observed in RW-2, RW-3, RW-4, and RW-6. A total of approximately
<br /> 0.93 gallon of product was recovered during the monitoring and recovery period, and a cumulative total
<br /> of approximately 173.04 gallons of recovered diesel has been removed via the site's recovery wells.
<br /> During the fourth quarter groundwater monitoring event conducted on November 13 and 14, 2006,
<br /> Condor sampled the three on-site monitoring wells and the SE sump and SW sump. Groundwater
<br /> elevation data collected on November 13, 2006 indicated that the average groundwater elevation had
<br /> ' decreased by 0.28 foot since the August 14, 2006 event. The calculated groundwater gradient was
<br /> approximately 0.003 ft/ft to the east. TPH-D was detected in MW-2 and the SW sump at 0.111 and 1.65
<br /> mg/L,respectively, and TPH-MO was detected in the SW sump at a concentration of 13.9 mg/L.
<br /> ' Seven diesel recovery and skimmer O/M events were conducted at the site from September 1 through
<br /> November 10, 2006. Free product was observed in RW-1, RW-2, RW-3, RW-4, and RW-6. A total of
<br /> approximately 1.0 gallon of product was recovered during the monitoring and recovery period, and a
<br /> 1
<br />
|