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DRAFT [TENTATIVE] WASTE DISCHARGE REQUIREMENTS ORDER R5-2023-OOXX 31 FORWARD, INC. FORWARD LANDFILL SAN JOAQUIN COUNTY Table 8—Stage I Closure Schedule' Unit Module Closure Date Acreage Stage IA 2006 30 Stage IB 2012 20 Stage IC To Be Determined 71 107. Per the Preliminary CPMP, the Discharger proposes closure of Stage IC with an engineered alternative final cover, as specified in Attachment F. 108. Scheduled dates for Stages II through Stage V were not submitted. The Discharger will need to submit an updated Preliminary CPMP with estimated scheduled closure dates for the remaining stages. See Section I, Table 11 Item 5. 109. The Discharger has adequately demonstrated that construction of a final slope in accordance with the Title 27 prescriptive standard would be unreasonably and unnecessarily burdensome in comparison to the proposed engineered alternative. The Discharger has further demonstrated that the proposed engineered alternatives described in Attachment E are not only consistent with the performance goals of the prescriptive standard, as described above, and will afford at least equivalent water quality protections. 110. As discussed in Attachment F, the Discharger proposes an evapotranspiration final cover for closure of Stage IC to Stage V. The final cover will consist of 4 feet of soil. 111. The proposed final cover slopes specified in Attachment F are within Title 27 limits (i.e., 1% horizontal feet for every 1 foot of vertical gain) and supported by a static and dynamic slope stability analysis demonstrating that side slopes will remain stable, both under stable and dynamic conditions, throughout the life of the unit. (See Title 27, section 21750, subdiv. (f)(5)). The final cover will include a 15-foot wide bench at minimum for every 50 feet of vertical gain. (See Title 27 section 21090, subdiv. (a)). 112. The Discharger's proposed final covers, together with any modifications set forth in Attachment F, can proceed with the closure of the WMUs identified in Finding 107. Closure dates are estimates, which may be affected by several factors (e.g., fluctuating waste receipts).