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~ Reviewcomments on the Revised H~ydrogeo Report (Phase Z and zz) and Phase zzzPhase Tv work Plan.t~ <br />From: Matthew ~edvina [mlledvina@nrginc.com] <br />Sent: Thursday, August 25, 2005 12:01 PM <br />To: dave.lucas@co,sherburne.mn.us; ~ohn.elks@pca.state.mn.us; Deb waiters (Business <br />Fax); eidem@geamatrix.com; Johnson, Terry <br />Cc: Rolf, Stever rhaug@ci.elk-river.mn.us <br />subject: Fw: Review/Comments on the Revised Hydrogeo Report (Phase z and zz) and <br />Phase zzz/Phase zv work Plan <br />sieve Rohlf has requested that z forward my review and comments on the <br />above-referenced topic. <br />Regards, Matt. <br />Matt Eedvina, P.E. <br />mlledvina@nrginc.com <br />612.339.2316 Direct <br />612.339.4990 Fax <br />Fram: Matthew ~edvina <br />sent: Wednesday, August 03, 2005 9:33 AM <br />To: `Rohlf, Steve'; Rebecca Haug (rhaug@ci.e1k-river.mn.us <br />Subject: Review/Comments on the Revised Hydrogeo Report (P are I and zz) and Phase <br />zzz/Phase zv wori< Plan <br />Steve: <br />z have completed my review of the above-referenced Report for the south pevelopment <br />Area of the wMI, Elk River Eandfill. My comments are presented below. overall, the <br />effort answered many important questions. The deep borings show that there is mare <br />complexity and questions regarding the continuity far the till 1a er between the <br />upper and lower outwash units which transmit cw at the site. r think the water <br />level data provides sufficient evidence to support the wMZ hypothesis that they are <br />not connected. otherwise, we would require monitoring of the lower outwash. <br />Please let me know if you would like me to convey my comments.....email or <br />letter....and to which involved parties. <br />comments: <br />The construction of the lower outwash.piezometers at locations 315, 317 and 318 <br />provide additional data on the integrity of the till unit in the west and south <br />Page 1 <br />