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• The current design incorporates a state of the art composite liner system; 2 feet of compacted <br />clay soil barrier overlain by a 60 mil high density polyethylene flexible membrane liner. Together, <br />these two components of the liner system prevent contaminants from penetrating the <br />surrounding environment. <br />Overlying the liner section is the leachate collection layer. The leachate collection layer consists <br />of either 1 foot of highly permeable drainage sand or a synthetic drainage material called a <br />geocomposite. The geocomposite is comprised of high density polyethylene channels <br />manufactured to rapidly convey liquids and is considered equal to the transmission capacity of 1 <br />foot of drainage layer sand. <br />12" GR+ <br />12` INTE <br />d I HUPE GEOMEAfiRAHE <br />CLAY 6ARR[ER LAYER <br />• Liner System <br />The final cover section is similarly designed with a layer of buffer material Installed over the final <br />waste elevation prior to the placement of a 40 mil linear low density polyethylene liner material <br />that is overlain by either a sand drainage material or a synthetic drainage material, <br />geocomposite. The final layer of the landfill cover section is a layer of soil material that can <br />sustain and promote vegetative growth. <br />z <br />~~ <br />z_ <br />g <br />V ~? <br />N ~~ <br />TOPSOIL <br />COVER SOILS <br />GEONET <br />TEXTURED 40 mil <br />LLDPE GEDMEMBRANE <br />~~., <br />BUFFER SDILS <br />Cover System <br />The landfill base liner, in conjunction with the final cover liner, completely encapsulates the MSW <br />materials from the surrounding environment. <br />• <br />Elk River Landfill SDA ~ ~~ ~ 80112511'00 Section 1-5 <br />Land Use Application £' ' ~IVI/et1C~< <br />ttw w+rsw uwaona <br />