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7.2.4.3 ESTIMATED COST FOR WORST CASE RELEASE MITIGATION <br /> In accordance with 27 CCR, Section 20380(b), Forward will establish and <br /> maintain assurance of financial responsibility for initiating and completing <br /> corrective action for all known or reasonably foreseeable releases from the <br /> facility. Recognizing the limited thickness of the vadose zone and the ephemeral <br /> occurrence of surface water at the site, it is expected that the worst case release <br /> from the facility would be to groundwater. <br /> A corrective action program (CAP) has been implemented along the northern <br /> (downgradient) border of the existing Austin Landfill. Since groundwater flow <br /> from the existing Forward Landfill is northerly:toward the existing Austin Road <br /> Landfill, should a release occur from the existing Forward Landfill it would be <br /> largely contained by the Austin Road Landfill CAP— HowdeverY-.since northeasterly <br /> component of groundwater flow is sometimes identified in the area, it is possible <br /> that some part of a new release could migrate east of the proposed expanded <br /> Forward Landfill, and outside the current Austin Road Landfill CAP containment <br /> area. If this were to occur, it is likely that this would necessitate expansion of the <br /> CAP. Such an expansion could-include-installation of additional groundwater <br /> extraction wells, installation of aquifer recharge systems, and installation of <br /> additional gas collection wells. Assuming that an area of impacts is identified <br /> along the northeast side of the Forward Landfill, and assuming that the area of <br /> impact is similar to the impacts currently existing at the Austin Road Landfill, the <br /> additional CAP measures that could be required might include: installation of 2 <br /> additional groundwater extraction wells, installation of an aquifer recharge basin, <br /> and installation of up to 10 additional gas extraction wells: <br /> As shown in Table 20, it is estimated that the costs to implement these additional <br /> CAP measures at the Forward Landfill would be approximately $377,476. This <br /> total is intended to provide a basis for compliance with 27 CCR, Chapter 6, <br /> Subchapter 2, Article 4 financial assurance requirements. This cost estimate <br /> takes into account typical well construction, earthworks, and appurtenant costs. <br /> 7.2.4.4 CORRECTIVE ACTION FINANCIAL ASSURANCE <br /> Corrective action financial assurance for the combined Forward Landfill facility is <br /> to be prepared. <br /> Forward Landfill JTD 7-9 <br /> L:\Allied\2000.193\Reports\finaljtd:Sec-7.0:08/20/01 BRYAN A.STIRRAT S ASSOCIATES <br />