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