ARCHIVED REPORTS_2003_5 - Laserfiche WebLink

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WMU FU-03 base. A permanent double composite lined LCRS sump will be constructed at the southern edge of WMU FU-03 base. Side slope liners will be constructed on the northern, southern, and western slopes. The side slope liner consists of a geosynthetic clay liner (GCL) overlain by a 60-mil, single-sided textured, HDPE geomembrane, and a single-sided geocomposite drainage net (GDN). A portion of the northern WMU FU-03 slope is underlain by the former Austin Road Landfill. To provide support for the side slope liner, an approximately 4-foot thickness of subgrade fill will be placed and compacted over the portion of the former Austin Road Landfill that underlies WMU FU-03. The WMU F-Westleachate impoundment has been designed to store approximately 2,700,000 gallons of leachate with two feet of freeboard (531,000 gallons additional). WMU F-West will receive leachate from the southwest landfill cell from the former Austin Road Landfill as well as the expanded landfill resulting from the relocation of Little John Creek. The leachate impoundment has been designed with a composite liner which consists of a 60-mil primary HDPE, geonet, and a secondary 60-mil HDPE with a GCL on prepared subgrade. The desalting basin has been designed with 2.5 side slopes and a floor grade of 0.5 percent to the outfall riser. The outfall riser is a 48-inch CSP stand pipe with 1-inch diameter holes spaced at 6 inches on-center. The stand pipe is connected to a 36-inch CSP with 1-inch diameter holes at 6 inches on-center which is transitioned to a solid, smooth-walled steel ribbed pipe (SRP) with seep collars to prevent piping of water along the outlet pipe. The 36-inch SRP outfall is into the most westerly portion of Little John Creek before it leaves the site. The basin stores 13,660 cubic yards of potential silt. Aak 0 FORWARD LANDFILL WMU F-03 AND F-WEST DESIGN REPORT 1-2