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5-6 5.2.4.2 Proposed Final Cover Design Introduction Several factors were taken into consideration in determining the final cover design for the Forward Landfill, including the geometry of the existing landfill, local climatic conditions (i.e., arid environment, low rainfall, and high evaporation rate), potential landfill settlement, available cover materials, erosion protection, vegetative growth, and the proposed end use after closure. Based on these factors, Forward, Inc. determined that an alternative final cover design utilizing an on-site soil engineered as a monolithic final cover design was the most appropriate cover system for the Forward Landfill. Approval of a final cover design that is different than the prescriptive standard is allowed under 27 CCR, Section 20080(b) as an alternative cover system. The alternative design is allowed if the discharger demonstrates that: (1) The construction of prescriptive standard is not feasible as provided in subsection (c) of Section 20080, and (2) There is a specific engineered alternative that: (A) is consistent with the performance goal addressed by the particular construction or prescriptive standard, and (B) affords equivalent protection against water quality impairment. As stipulated in subsection (c) of Section 20080, to establish that the prescriptive standard is not feasible the discharger must demonstrate that the prescriptive standard: (1) is unreasonably and unnecessarily burdensome and will cost substantially more than alternatives which meet the criteria in subsection (b) of Section 20080; or (2) is impractical and will not promote attainment of applicable performance standards. The proposed alternative final cover design will meet or exceed the prescribed performance criteria and will be more economical for site closure than prescriptive standards. Alternatives to the prescriptive standards are allowed pursuant to 27 CCR, Section 21090 which states that "The RWQCB can allow any alternative final cover design that it finds will continue to isolate the waste in the Unit from precipitation and irrigation waters at least as well as would a final cover built in accordance with applicable prescriptive standards". In 2005, GLA prepared a report in support of the alternative final cover design (see Appendix 1). The report evaluated the performance of the alternative final cover for the Forward Landfill. The analysis preformed in support of the alternative final cover was done using Forward Landfill SWT Engineering Joint Technical Document - April 2014 z:\projects\allied waste\forward\five year permit rvw 2013\jtd-5 yr pr 2013\text\sec 5 final.doc