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local climatic conditions (i.e., arid environment, low rainfall, high evaporation <br /> rate), potential landfill settlement, available cover materials, erosion protection, <br /> vegetative growth and proposed end use at closure. It was determined that an <br /> alternative final cover design utilizing a monolithic engineered select soil cover is <br /> the most appropriate cover system for the Forward Landfill based on these <br /> parameters. Approval of alternative cover systems is allowed in 27 CCR, Section <br /> 20080(b) in cases where the discharger demonstrates that: <br /> (1) The construction of prescriptive standard is not feasible as provided in <br /> subsection (c) of Section 20080, and <br /> (2) There is a specific engineered alternative that: <br /> (A) is consistent with the performance goal addressed by the particular <br /> construction or prescriptive standard, and <br /> (B) affords equivalent protection against water quality impairment. <br /> As stipulated in subsection (c) of Section 20080, to establish that the prescriptive <br /> standard is not feasible the discharger must demonstrate that the prescriptive <br /> standard: <br /> (1) is unreasonably and unnecessarily burdensome and will cost substantially <br /> more than alternatives which meet the criteria in subsection (b) of Section <br /> 20080; or <br /> (2) is impractical and will not promote attainment of applicable performance <br /> standards. <br /> The proposed alternative final cover design will meet or exceed the prescribed <br /> performance criteria and will be more economical for site closure than <br /> prescriptive standards. <br /> Based on a number of analyses performed for similar sites located in California, it <br /> was determined that a three-foot thick final cover section composed of select <br /> soil material will meet or exceed the performance criteria of the prescribed <br /> standard, a traditional barrier layer is not proposed for the alternative final cover <br /> design. Site-specific conditions at the Forward Landfill rendered a performance <br /> criteria based on annual surface water infiltration through the proposed <br /> alternative final cover. <br /> Forward Landfill PFCPCMP 3-3 <br /> J:\Allied\Forward\2005.0051 Partial Closure\Partial Closure Plan\FL-secIdoc:6/15/2005 <br />