6.6. SR 03-15-2010 - Laserfiche WebLink

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~'a~e G oi' ~ Ect~~t~ ~a fir. Joh~~ Elits ~ Mr. ~at# Eedvix~a RE; ~eviscd ~I~A l~ydra~eoio~ic Evaiua~iora Report EIk River Eandfiii, inc. A sequenced approach to monitoring system development is necessary when landf ill development progresses in a downgradient fashion and the prof ected life/capacity of the proposed development is extended, It r`s suggested that the wells proposed for the southern property boundary be moved northward to a position whic~i coincides with the ten~yea~ waste~ll limit. These wells would subsequently be replaced with weds located at the south property boundary when tlie~ll progresses to this point, rt slio~cld be noted that if the waste ~~eceiuing rated d~c~^eas~, the wells would b~ in posztian to monitor the facility on an expanded tune frame, The proposed SSA cells are graded to direct leachate toward the collection sumps on the eastern portion of the site. The leachate sumps are considered the most likely locat~ans of an environment~.l release due to the accumulation of up to 12ainches of leachate head. above the liner, ~3ased an observed gxaun.dwater elevations, a release of leachate from the sump of cell ~o is anticipated to migrate to proposed monitoring paints ~ i S-Q~'A or 3~~p~WA, Please refer to Figure 2~, As indicated. by the MPCA., the configuration of the groundwater monitoring system shall not be determined until completion of the hydrogeolagic investigation. Z sincerely appreciate your input on this project and the appart~.nity to discuss the scope of the investigatiou. with you at various stages. Please contact me at your convenience if you have any questions. Si~acerely, Terry Johnson I~ire~tor, groundwater Protection Program Waste Management, Znc, Encl Cc: deb ~ehn, Elk River Landfill Stephanie Stab, Elk River Lands 11 Ueb Mc~onald, Waste Management, inc. Steve Rohlf, .City of Elk Rl.ver have Lucas, Shez~burne County Jeffery Ubi, Farr Engineering Company Jim Eidem, geomatrix Consultants, znc.