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45 East Harding Chronology <br /> Page 5 a1. <br /> �a 4t-= j <br /> Four soil samples were collected following the tank removals for laboratory analysis: <br /> Sample ID/Depth TPH Benzene Toluene Ethylbenzene Xylene <br /> Tank Removal (gasoline) <br /> 1138-05 Middle <br /> #5 @7.5' <br /> 1138-06 <br /> #144 @11.5' <br /> 1138-07 <br /> #243 @11.5' <br /> Stockpile <br /> Note: All results in ppm (mg/kg) <br /> 1989 <br /> 1/23/89 Seven soil borings were drilled, two were completed as monitoring wells, MW7 and <br /> MW8, and five were completed as vapor extraction wells, V1-V5 (See the attached <br /> Well Construction Details table). Soil samples were collected during the installation <br /> of MW7, MW8 and vapor extraction wells, V1-V5 for analysis: <br /> 4/89 A vapor extraction test was performed which demonstrated that an effective radius <br /> of influence. Initial vapor sample results evidenced petroleum hydrocarbon <br /> contamination up to 16,000 ppm from vapor extraction well, VWS. <br /> 1991 <br /> Groundwater monitoring was conducted using MW9 only because the other existing monitoring <br /> wells were dry, on 7/24/91- 10/23/91 following the installation of MW9 and the depth to water <br /> ranged from 42.0' - 41.86' bgs <br /> 1992 <br /> Groundwater monitoring was quarterly conducted using only MW9, MW10 and MW1 1(following <br /> their installation in May 1992) because the other existing monitoring wells were dry and the depth <br /> to water ranged from 52.32' (January 1992) - 56.88' bgs (October 1992). <br /> 1993 <br /> 6/29/93 Monitoring wells, MW12 and MW13 were installed. Soil samples were collected. <br /> Soil contamination was observed at approximately 55 feet bgs; however, this <br /> sample was not submitted for laboratory analysis. <br /> 12/13/93 Monitoring well, MW2R was installed and three soil borings, S131 - SB3 were drilled <br /> and sampled. While drilling MW2R another underground tank was discovered. <br /> Another suspected tank was indicated during the subsequent ground penetrating <br /> radar survey. <br />