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GETS was not installed, due to concern for an apparent upgradlent source of hydrocarbons that <br /> could be pulled onto the site, and the necessity of adding upgradlent monitoring points <br /> A soil vapor extraction (SVE) system was also proposed in EA's 1990 plan, to address the <br /> question of petroleum hydrocarbons in the vadose zone soil The SVE system was installed and <br /> began operation in May 1994 The SVE system has been operating along with two air sparging <br /> wells, SW 1 and SW2 The system has successfully remedlated petroleum hydrocarbons in the <br /> I former source area beneath the site The SVE system recovered petroleum hydrocarbons using <br /> four vadose zone wells screened from 10 to 30 feet bgs A total of 16,000 pounds of petroleum <br /> hydrocarbons have been removed from the vadose zone by the SVE system <br /> Due to an increase in groundwater elevation at the site, petroleum hydrocarbons trapped in soil <br /> below the water table have not been effectively remedlated with the SVE system Based on <br /> I previous site investigations (EA 1987a, 1987b, 1988a, 1988b, 1989a, 1989b, 1990, 1991), <br /> petroleum hydrocarbons occur at the site between 27 and 42 feet bgs The performance of the <br /> SVE system is documented in the quarterly groundwater monitoring reports for former Exxon RS <br /> I7-3942 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> I <br /> I <br /> WP61 73942 RO1397 3 4 <br />