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GEOSYNTEC CONSULTANTS <br /> Ms. Amy Terrell <br /> 25 August 2003 <br /> Page 4 <br /> ■ physical constraints, such as proximity of the former tank farm area to the <br /> irrigation canal immediately east of the site and, the foundation and <br /> structure of the new dry fertilizer bins. <br /> Phytoremediation was rejected because of the lack of area for planting and growing <br /> trees or other high-nitrogen consumption plants. Excavation was rejected because the <br /> associated costs are potentially very high (due to the depth of the excavation that could <br /> be required; proximity to the irrigation canal, which could necessitate shoring; etc) and, <br /> WFS business operations could be significantly disrupted or stopped during the <br /> excavation and backfilling operations. <br /> Enhanced in situ bioremediation was identified as the most viable corrective action <br /> for nitrogen in soil at this site, given the known effectiveness of denitrification for <br /> nitrate-nitrogen, the minimal disruption to site operations for implementing an in situ <br /> corrective action program, and the potentially lower overall costs. The effect of this <br /> treatment on ammonium-nitrogen is less well understood. <br /> APPLICATION OF ENHANCED IN SITU BIOREMEDIATION FOR SOIL <br /> Feasible methods for implementing enhanced in situ bioremediation for soil include <br /> application of a carbon source via direct application to the surface soils, through <br /> induced horizontal hydraulic fractures, and by direct injection(e.g. GeoProbe). <br /> A candidate carbon source for soil application is HRC Primer, produced by <br /> Regenesis of San Clemente, California. HRC Primer is a combination of Hydrogen <br /> Release Compound (HRC) and lactic acid,which is more liquid than HRC, allowing for <br /> better injection results in the clay soils at the site. HRC Primer releases lactate,which is <br /> metabolized by naturally occurring microorganisms, in the presence of water. Since the <br /> injections will be in the unsaturated zone, the remediation will rely on infiltrating <br /> rainwater or water applications to distribute the HRC Primer and stimulate <br /> bioremediation. <br /> P:\PRJ2003REM\WFS\VER\Soil Plan 2003\RAP-Soil 8-25.doc <br /> RECYCLED AND RECYCLABLE <br />