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3049 West Highway 12 <br /> Closure Chronology <br /> Page 2 <br /> 1991 <br /> 03/31/91 Site visit to observe over-excavation sampling of Pit 1 and to witness the removal of an underground <br /> storage tank from Pit 2. During this site visit additional underground storage tanks were discovered. <br /> 1993 <br /> 05/18/93 Tanks from Pit I and Pit 2 and contaminated soil from Pit#1 were removed. Five soil samples were <br /> collected from the Pit I over-excavation,and two soil samples were collected from the stockpiled soil. <br /> The results are reported in the Condor Earth Technologies' "Underground Storage Tank Removal and <br /> Over-Excavation:Soil Sampling Results"report dated June 21, 1993. The Condor report also includes <br /> three soil samples which were collected from beneath the additional three tanks which were removed <br /> from Pit 1. The analytical results are summarized below: <br /> Sample Benzene Toluene Ethyl- Xylene TPH- Lead EDB <br /> benzene gasoline <br /> Pitl-N@10' <1.0 3.2 5.9 65 1,400 <5.0 0.0053 <br /> Pit]-13@17' <.005 <.005 <.005 <.005 <2.5 <5.0 <.005 <br /> Pit I-W@11' <A05 <.005 <.005 <.005 <2.5 <5.0 <005 <br /> Pit]-S@14.5' <.005 <.005 <005 <.005 <2.5 <5.0 1 <.005 <br /> Pit I-E@]I' <.005 <.005 <.005 <.005 <2.5 <5.0 <.005 <br /> Stockpile 1/2 NA NA NA NA 680 NA NA <br /> Stockpile 3/4 NA NA NA NA 420 NA I NA <br /> Note: All results in mg/kg(ppm) <br /> NA:Not Analyzed <br /> EDB: Ethylene Dibromide <br /> 05/21/93 Three soil borings, 145R-B1 - 145R-B-3 were drilled this date as part of the closure in-place of two <br /> underground storage tanks that were located in Pit 2. The results of this investigation are summarized <br /> within the Condor Earth Technologies' report"Soil Investigation for UST Closure-In-Place" dated June <br /> 11, 1993. See the attached Pit 2 sampling results and boring logs for more information. The excavation <br /> was backfilled with pea gravel. <br /> 10/01/93 Two underground storage tanks were closed in place. <br /> 1995 <br /> 07/19/95 Two soil samples were collected from the aerated stockpiled soil and fourteen samples were collected <br /> from the five boreholes which were drilled and sampled to characterize the remaining soil <br /> contamination(boring logs and maps are attached). The samples collected from S135 were not <br /> analyzed. The results were reported in the Condor Earth Technologies' "Soil Investigation Report" <br /> dated August I6, 1995. The results of the soil sampling are summarized below: <br /> Sample Benzene Toluene Ethyl- Xylene TPH- EDS <br /> benzene gasoline <br /> SB 1 @ 10' <005 <.005 <.005 <.005 <1.0 <005 <br /> S131@13' <.005 <.005 <.005 <005 <1.0 NA <br /> S132@10' <.005 <.005 <.005 <005 <1.0 <.005 <br /> S132@15' <.005 <.005 <.005 <.005 <1.0 NA <br /> S133@10' <.005 <.005 <.005 <.005 <1.0 NA <br /> S133@15' <.005 <.005 <.005 <.005 <1.0 NA <br /> S134@10' <005 <.005 <.005 <.005 <1.0 NA <br /> SB4@15' <.005 <.005 <.005 <.005 <1.0 NA <br /> STKP-E <005 <.005 <.005 <.005 <L0 NA <br /> STKP-W <.005 <.005 <.005 <.005 <1.0 I NA <br /> Note: All results in mg/kg(ppm) <br /> NA:Not Analyzed <br /> EDB: Ethylene Dibromide <br />