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WASTE DISCHARGE REQUIREMENTS ORDER R5-2015-0058-01 -21- SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS FOOTHILL SANITARY LANDFILL, INC. FOOTHILL LANDFILL SAN JOAQUIN COUNTY will meet the criteria contained in Title 27, section 20080(b), or would be impractical and would not promote attainment of applicable performance standards. The Discharger must also demonstrate that the proposed engineered alternative liner system is consistent with the performance goal addressed by the particular prescriptive standard, and provides protection against water quality impairment equivalent to the prescriptive standard in accordance with Title 27, section 20080(b)(2). 88. Water Code section 13360(a)(1) allows the Central Valley Water Board to specify the design, type of construction, and/or particular manner in which compliance must be met in waste discharge requirements or orders for the discharge of waste at solid waste disposal facilities. Landfill 1 89. LF-1 (Module I) is an 84-acre, partially-closed landfill unit in the central portion of the site. As the original Foothill Landfill disposal module, the unit predated Title 27 regulatory standards and was not constructed with a Title 27 containment system or LCRS. 90. The landfill is approximately triangular-shaped with 2,000 foot long sides. The top deck area (also triangular-shaped similar to the base) was partially-closed with an ET cover in 2006, as described in Finding 135. The base elevation of the unit is unknown due to the unavailability of historical construction documents, but is estimated to be about 250 feet MSL. The maximum elevation of the landfill is about 432 feet MSL, including final cover, corresponding to about 170 feet above surrounding grade. The maximum height of the LF-1 waste column is estimated to be about 180 feet. See Attachment C: Site Map. 91. LF-1’s exterior side slopes were graded to an average of about 4H:1V with 15-foot wide side slope benches every 50 feet of vertical height. All side slopes except for the southern slope were filled to planned final waste grade and covered with up to 3 feet of interim cover soil, including partial cover soil placed on the slopes under the 2006 Site Improvement Program (see Finding 128). A geomembrane barrier layer was also installed on the lower portion of the southern slope during the second phase of Module 1. Various erosion and drainage control improvements were also implemented at the module to bring it into compliance with Title 27 standards. 92. Precipitation and drainage controls installed on the landfill module included: a. Top decks graded at 5% minimum for drainage. b. Soil berms along top deck perimeter to direct runoff to corner drop inlets. c. Overside drains to capture top deck and side slope bench drain flows. d. Ditches installed alongside slope benches to intercept and convey sheet flow runoff to overside drains. Benches also graded for sheet flow runoff. e. Landfill perimeter ditches to convey collected runoff to onsite storm water basins. See Finding 51. f. Velocity controls (e.g., erosion control blanket, rip rap) at appropriate locations in bench drains and landfill perimeter ditches to reduce erosion