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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2010-0016 -11- SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS NORTH COUNTY LANDFILL SAN JOAQUIN COUNTY 45. Module 1’s LCRS included perforated HDPE collection pipe (3-inch laterals and 6-inch headers) in gravel-filled troughs overlying the blanket layer of filter fabric/geonet. The foundation layer was graded at a 1.4% cross slope toward a leachate collection sump on the western side of the module. The system was plumbed for gravity drainage to the sump, which was constructed with a single composite liner. The sump was installed with a manually operated pump and no automatic flow recordation. The sump was plumbed to a 3,000 gallon above ground storage tank (AGT) in the southwest corner of the module. To ensure compliance with Discharge Specification B.5, Facility Specification C.4 requires that all manually operated LCRS sumps, including Module 1’s, be upgraded to the automatic controls specified for new modules in Construction Specification D.2.d. Provision G.8.a requires that the Discharger submit a work plan and schedule for implementing these upgrades. . 46. The interface between Modules 1 and 3 consisted of an anchor trench/berm approximately 3 feet in height. Module 3 47. Module 3 was constructed in 1995 with a Subtitle D-compliant, engineered alternative design (EAD) to the Title 27 prescriptive standard for an MSW landfill, approved under previous WDRs (Order No. 95-068), as follows, from top to bottom: Component Base Liner Side Slopes Operations Layer ≥ 2’ soil Filter Fabric Geotextile1 LCRS Geonet 60-mil HDPE2 Base Liner GCL 80-mil HDPE2 Foundation Layer ≥ 6” compacted soil ____________________________ 1. 10 oz/yd2 non-woven fabric. 2. HDPE single-side textured, placed smooth side up. Module 3’s LCRS was the same basic design as Module 4’s (See Construction Specification D.2), but with a manually operated sump pump. Also, the collection sump for Module 3 was plumbed to the same AGT as Module 1. As with Module 1, Facility Specification C.4 requires that Module 3 sump be upgraded to the automatic controls specified for new modules in Construction Specification D.2.d, while Provision G.8.a requires submission of a work plan and schedule for implementing the required upgrade.