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MgY.27.199f3 3~22PM DIViMINERFILS&GEOLOGY <br />III IIIIIIIIIIIIIIII <br />999 <br />DIVISION OF MINERALS ANp GEOLOGY <br />Oewmnem d Nanrral Resources <br />t 313 Sherman St, Reom 27 5 <br />f7enver, Colorado 80203 <br />Phone: f3D3)876,p6~.3p5~67 <br />F/J(: G~p777a[3 Matl]EWS <br />FROM: Jim BLUnell <br />N0. 116 P.Si2 <br />STATE OF COLORADO <br />YNTERNAL MEMO <br />27 May 1998 <br />SUHJ: Red Canyon AHI2 and Associated Pre-Bond Release Questions <br />Ray Rarer <br />Gorenror <br />lames s. ~od,head <br />Eaecu[ive Direcmr <br />Dan, I will try to go over the questions you posed viB a via the Red Canyon AIiR and sampl,~a~ a ono <br />ISSt7eS related LO the IIOt-t00-dISL$IIt bOIld I1C1faSC. Otrbion Direcmr <br />Ql (Can alluvial and rethae'wells be reclaimed without using cement or other sealant <br />(cnttinga only.) <br />Al. We do this routinely in exploration, so T say go ahead, as long es these is ao situation which <br />would allow eross~ontamiaation from a bedrock well. <br />Q2 (Ia pelletized sealant a "suitable aealaat"' for coal seam wells?) <br />A2 Yes, as long as any portion that penetrates the glacio-alluvial aquifer is cemented. <br />Q3 (wr71 any additional monitoring need to be performed for bond release prior to well <br />closure?) <br />A3. Yesty I believe so. From what I can discern, the following siutation exists. No groundwater <br />has been sampled in a good many years, so we will need to check this out before final bond <br />release. <br />I.) Need to sample and kocp open E-1. We really do need to see where the water level is going <br />with that E-seam and what the hydrochemistry of the water is incase it comes up to the portal. <br />By what T can piece together from the permit, E-1 is essentially along strike from the portal, and <br />probably cross-gradient. l don't know for stns. 1 would be concerned if water from the mine <br />(whose quality is probably suspect) recharged the glacio-alluvial aquifer. Along those lines, <br />there is an aLea where the D acid E seams subcrop beneath the glacio-alluvial aquifer. That area <br />appem~s to be up-gradient of the mine (and we]Upiezometsr E-1), so only if water in the B-seam <br />continues to rise and come out the portals will it also emerge into that aquifer from the bedrock. <br />Actually, I suspect the reason for the water level rise in the E-seam is that the subcrop area is <br />serving as an area of recharge now. Water from the last real wet season is entering the E-seam <br />through from the g-alluvial aquifer at that subcrop area. <br /> <br />