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WASTE DISCHARGE REQUIREMENTS ORDER R5-2015-0058-01 -24- SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS FOOTHILL SANITARY LANDFILL, INC. FOOTHILL LANDFILL SAN JOAQUIN COUNTY 100. All components of M-1’s LCRS, including blanket layer, piping, sump, and handling facilities were designed to meet Title 27 performance standards using appropriate engineering methods and models (e.g., Hydraulic Evaluation of Landfill Performance (HELP) Model Version 3.07, pipe flow calculations). 101. The exterior side slopes of Module 1 were graded with slopes not exceeding 3.4H:1V with 15-foot wide benches every 50 vertical feet. A 200 foot setback from the site perimeter was also maintained. Precipitation and drainage controls installed at the module were similar to those installed at LF-1. See Findings 51 and 92. Module 2 102. On 27 January 2015, Central Valley Water Board staff approved the design report for Module 2 (M-2), the next landfill expansion module to be constructed at the site. M-2 will be constructed contiguous with, and immediately south of, Module 1.11 The new module’s footprint will be built-out in two phases, including a 14-acre first phase (M- 2A) scheduled for completion by the end of 2015, and a second phase (M-2B) scheduled for completion by the end of 2018. The modules’ containment system (i.e., base liner and excavation side slopes) will consist of the approved EAD authorized under the previous WDRs. M-2’s containment system will therefore be the same as M-1’s, absent a Title 27-lined interior side slope overlapping LF-1. 103. M-2A’s foundation layer will generally be graded to slope from west (222 feet MSL) to east (210 feet MSL) at a 1% grade. Three parallel V-drains each one foot deep with 3H:1V side slopes will be cut into the foundation layer for the overlying LCRS (described below). The module’s excavation side slopes will be 2H:1V on all sides except the east side, which will be 3H:1V. An access road will also be constructed on the west side of the module. The M-2B area will be used as a staging area during M- 2A construction. 104. M-2A’s LCRS will include a 9-inch thick gravel blanket layer overlying three east- sloping, gravel-filled V-drains. The effective drainage grade within the V-drains will be 2% toward the east-sloping center line. Four-inch lateral collection piping will be installed in the V-drains to assist drainage. Two of the laterals/V-drains will be plumbed to a 6-inch perforated header pipe running along the eastern side of the module, while the other V-drain will be plumbed directly into the LCRS sump. Each lateral will be accessible for inspection and cleaning via riser pipe extending up the eastern excavation slope. 105. Drainage calculations for M-2’s LCRS are summarized as follows: 11. See 5 October 2014 Design Report, Area 2A Expansion, Foothill Sanitary Landfill, prepared by Geosyntec, Inc..