ARCHIVED REPORTS_2014 NOV TPR - Laserfiche WebLink

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Consolidated Forward Inc. Landfill Page 13 site. The surface-water collection drain system will be designed w divert the water to the storm water collection basin in the southwest corner of the curr=.Austin Road Landfill,at times when enough surface water accumulates to have discharged into the collection basin. All waste at the proposed Fonard Landfill will be separated f-am.the north and south branches of Littlejohn Creek by a levee system or other acceptable method designed to protect the site from a 100-year flood event. The project includes channel reconfiguration and localized flood protection berms to isolate the landfill surfaces from floodwaters. The project design also includes provision of replacement floodplain area and storage volume in an easement along the relocated North Branch of the South Foek of South Littlejohns Creek. The channel and floodplain storage easement are designed to ae,ommodate the 100 year,24- hour storm. The design also includes a three-foot freeboard. 45(F.2) Proposed as Part of the Project: The JTD articulates the programs of drainage control structures and monitoring to inhibit erosion and sedimentation. Proposed structural controls include the drainage control system and daily cover. Operational controls include maintenance of the drainage system by keeping ditches clear of debris and excessive vegetation, and making ne_-&-i repairs to drainage structures. Corrective measures will be implemented if inspections show excessive erosion or damage to drainage channels. Eroded areas will be mitigated by removing loose debris followed by replacement,regrading,and compacting the area. & onitoring and protection against sediment from entering the Littlejohn stream channel w l be implemented,including the diversion of part of Littlejohn Creek farther away from the landfilled area. In order to minimize sediment transport to the Littlejohns Creek landfill slopes,ridgetops, and peripheral areas will be revegetated to inhibit erosion. 46(F.3) Proposed as Part of the Project: The liner and•leachate collection system for the expansion system--both over the top of the existing unlined Austin Road landfill and the extension of the cxisting leachate collection system at Forward—have been designed to meet or exceed the regulatory requirements as' shown and discussed in the applicants JTD. The JTD and the adequacy of the-.leachate collection system and associated monitoring are under review by the RWQCB. The regulatory required separation between the liner and ground-ater will be implemented to allow for chemicals in the leachate to attenuate before reaching the groundwater,should the leachate breach the collection system. The project design includes a leak detection system under the_4 gips. The Iiner system will be overlain by a protective operations laser consisting of a one-foot thickness of soil and a one-foot thick gravel layer that serves as zine leachate collection layer. This taro-foot layer will serve to protect the liner system from p or jagged materials in the waste.