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The proposed design is consistent with the existing design in that it incorporates a state, of <br />the art composite liner system; 2 feet of compacted clay soil barrier overlain by a 60 mil <br />high density polyethylene flexible membrane liner. Together, these two components of <br />the liner system prevent contaminants from penetrating the surrounding environment. <br />Overlying the liner section is the leachate collection layer. The leachate collection layer <br />consists of either 1 foot of highly permeable drainage sand or a synthetic drainage <br />material called a geocomposite. The geocomposite is comprised of high density <br />polyethylene channels manufactured to rapidly convey liquids and is considered equal to <br />the transmission capacity of 1 foot of drainage layer sand. <br />6" RERPORATED HGPEGDR 11 <br />LEACN AIE COL LEOT [L71 PIPE <br /> ~CD4R'vE AGGR64TE <br />~-~_~ <br />l f <br />IN>GE LAYER <br />" ~^y._ <br />! ~"~`~GEOTEXi7LE <br />12 <br />GRANDIAR PRF <br />~~` ~~~~,. <br />!' INTERAED[4TE 4GGRGAiE _ _ - <br />- / -_,_! \ <br />- _--___ <br />"~pp"77 <br /> - Ji _ ~~~_fi0 ~N~ ROPE GEWEL6R4RE <br />3 <br />S <br />y ;~~ ~-, .. c ~-29° QAY CARRIER LAYER <br /> <br /> <br /> <br />Liner System <br />The final cover section is similarly designed with a layer of buffer material installed over <br />the final waste elevation prior to the placement of a 40 mil linear low density <br />polyethylene liner material that is overlain by either a sand drainage material or a <br />synthetic drainage material, geocomposite. The final layer of the landf 11 cover section is <br />a layer of soil material that can sustain and promote vegetative growth. <br />T:\0742\140(,\Ciry•AppFeb\FEB Report_final (2).doc 2-O <br />