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WASTE DISCHARGE REQUIREMENTS ORDER R5-2015-0058-01 -32- SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS FOOTHILL SANITARY LANDFILL, INC. FOOTHILL LANDFILL SAN JOAQUIN COUNTY soil with a permeability less than or equal to the lesser of 1x10-6 cm/s or the permeability of underlying clay soil liner or natural geologic materials, as applicable; d. Foundation Layer - at least two feet of materials (soil and/or waste) with appropriate engineering properties to support the overlying cover. In lieu of the prescriptive cover design, the Discharger may construct an EAD provided that it meets the requisite demonstration under Title 27, section 20080(a). See Finding 93 (Footnote No. 9). LF-1 135. In May 2005, the Discharger submitted a Partial Final Closure and Postclosure Maintenance Plan for Module I as required under the CAO R5-2004-0706 as part of the Site Improvement Plan (see Finding 129.f). The plan proposed installation of a 4.5-foot thick evapotranspirative (ET) cover on the top deck of Module I as a corrective action measure under the CAO R5-2004-0706. Water Board staff subsequently approved the design report on the condition that the Discharger conduct a 5-year demonstration project to show that the ET cover qualified as an EAD under Title 27, section 20080(b). A test pad was constructed on the top deck and monitored for various parameters for five consecutive wet seasons (2008-2009 through 2012-2013). Monitoring results were submitted in annual assessment reports. In a 11 July 2014 letter, Water Board staff acknowledged that the Discharger had adequately demonstrated that the ET cover met or exceeded Title 27 standards and that the landfill had been partially closed in accordance with the CAO R5-2004- 0706. A description of the demonstration test pad and monitoring results is provided in the Information Sheet attached to this Order. 136. Given that LF-1 does not have a Class III base liner (see Finding 30) and is no longer authorized to accept new wastes for disposal (see Discharge Prohibition A.2), these WDRs require that the remainder of LF-1 (i.e., all slopes outside of the closed top deck) be closed in accordance with a Partial FC/PCMP submitted under this Order, as approved by Central Valley Water Board staff. The Partial FC/PCMP is due by 15 October 2016 and LF-1 is required to be completely closed no later than 15 October 2018. For LF-1 side slopes overlapped by LF-2 as the landfill is developed, these WDRs allow the Discharger to propose a single containment system that functions as both LF-1 final cover and LF-2 side slope liner, provided that Title 27 performance standards are met. See Closure and Postclosure Specifications E.1 and E.2 and Construction Specification D.11.b.3). LF-2 137. On 30 July 2010, the Discharger submitted a revised Preliminary Closure and Postclosure Maintenance Plan (PC/PCMP) with conceptual plans for closure of LF-1, Module I and the 10 planned LF-2 expansion modules as a single waste