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WASTE DISCHARGE REQUIREMENTS ORDER R5-2015-0058-01 -52- SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS FOOTHILL SANITARY LANDFILL, INC. FOOTHILL LANDFILL SAN JOAQUIN COUNTY 2. By 15 November 2018, the Discharger shall complete closure of unlined unit LF-1 (i.e., Module I) and within 30 days thereafter submit a certification that the landfill has been closed consistent with Standard Closure and Postclosure Specification G.23, SPRR and Provision H.9.d of this Order. LF-2 3. By 15 March 2017, the Discharger submit a revised PC/PCMP for LF-2 consistent with the revised Partial FC/PCMP submitted under these WDRs for LF-1, as approved by the Executive Officer, and all other requirements of this Order and Title 27, section 21769(b). The revised PC/PCMP shall include, but not be limited to, the following: a. A preliminary plan and timeline for partial/phased landfill closure; b. A preliminary demonstration under Title 27, section 20080(b) for an EAD final cover, if an EAD final cover is being proposed (see Closure and Postclosure Specification E.5); and c. Revised closure and postclosure financial assurance cost estimates, as appropriate. See Provision H.10 and Closure and Postclosure Specification E.4 below. 4. The operator shall to the extent feasible, based on site specific factors, implement partial and/or partial final closure activities as the site operation progresses, consistent with the closure of the entire site. See Title 27, section 21120(a). Both Units 5. Landfill final cover designs proposed in preliminary or final closure plans submitted under this Order shall be consistent with the prescriptive standard or engineered alternative design (EAD) options specified in Finding 134 and Construction Specification D.11. Any proposal for an EAD final cover included in a FCP or Partial FCP shall be accompanied by the requisite demonstration under Title 27, section 20080(b) and (c), including, but not limited to, a demonstration that construction of the prescriptive standard is infeasible and that the proposed EAD meets or exceeds Title 27 performance standards for final cover. Such demonstration may require a field pilot project or test pad. 6. Any proposal for final cover included in the FCP or Partial FCP for the landfill units shall meet the requirements of Title 27 and Subtitle D, including the requirement that that the permeability of the LHC layer (or percolation rate through proposed ET cover) be no greater than that of the base liner or underlying natural geologic materials (whichever is less) in order to prevent a “bathtub effect”. See Title 27, section 21090(a)(2) and 40 CFR 258.60(a)(1). 7. The Discharger shall obtain revised WDRs prior to closure with any other final cover design than the design or designs approved in this Order.