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design for the Forward Landfill, including the geometry of the existing landfill, <br />local climatic conditions (i.e., and environment, low rainfall, high evaporation <br />rate), potential landfill settlement, available cover materials, erosion <br />protection, vegetative growth and proposed end use at closure. It was <br />determined that an alternative final cover design utilizing a monolithic <br />engineered select soil cover is the most appropriate cover system for the <br />Forward Landfill based on these parameters. Approval of alternative cover <br />systems is allowed in 27 CCR, Section 20080(b) in cases where the <br />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 <br />particular 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 <br />prescriptive standard is not feasible the discharger must demonstrate that the <br />prescriptive standard: <br />(1) is unreasonably and unnecessarily burdensome and will cost <br />substantially more than alternatives which meet the criteria in <br />subsection (b) of Section 20080; or <br />(2) is impractical and will not promote attainment of applicable <br />performance standards. <br />The proposed alternative final cover design will meet or exceed the <br />prescribed performance criteria and will be more economical for site closure <br />than prescriptive standards. <br />Based on a number of analyses performed for similar sites located in <br />California, it was determined that a three-foot thick final cover section <br />composed of select soil material will meet or exceed the performance criteria <br />of the prescribed standard, a traditional barrier layer is not proposed for the <br />alternative final cover design. Site-specific conditions at the Forward Landfill <br />rendered a performance criteria based on annual surface water infiltration <br />through the proposed alternative final cover. <br />Forward Landfill PFCPCMP 3-3 <br />Z:\PROJECTS\Allied Waste\Forward\Reference Files Prior JTD\June 05 Stage IA Partial FCPCMP\FL-sec3.doc: 6/16/2008 <br />