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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 <br /> ephemeral occurrence of surface water at the site, it is expected that the <br /> worst case release 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. However, since <br /> northeasterly component of groundwater flow is sometimes identified in the <br /> area, it is possible that some part of a new release could migrate east of the <br /> proposed expanded Forward Landfill, and outside the current Austin Road <br /> Landfill CAP containment area. If this were to occur, it is likely that this would <br /> necessitate expansion of the CAP. Such an expansion could include <br /> installation of additional groundwater extraction wells, installation of aquifer <br /> recharge systems, and installation of additional gas collection wells. <br /> Assuming that an area of impacts is identified along the northeast side of the <br /> Forward Landfill, and assuming that the area of impact is approximately half <br /> that of the impacts currently existing at the Austin Road Landfill, the <br /> additional CAP measures that could be required might include: installation of <br /> 2 additional groundwater extraction wells, installation of an aquifer recharge <br /> basin, and improvements to the gas extraction system. <br /> As shown in Table 20, it is estimated that the costs to implement these <br /> additional CAP measures at the Forward Landfill would be approximately <br /> $155,469. This cost estimate does not include costs for improvements to <br /> the gas extraction system as there are financial assurances for these costs <br /> included in the closure costs (see Appendix Q. This total is intended to <br /> provide a basis for compliance with 27 CCR, Chapter 6, Subchapter 2, <br /> Article 4 financial assurance requirements. This cost estimate takes into <br /> account typical well construction, earthworks, and appurtenant costs. <br /> Forward Landfill JTD 7-11 <br /> z:\projects\allied waste\forward\jn81013 5 yr review plan\jtd amd 3 pcpcmp amd 3 nov 08\jtd sect 7.doc <br /> 5/24/02;Revision 1:7/2002;Amendment No.3: 11/18/08 <br />