2006-07-05_REVISION - M1982015 (2)

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STATE OF COLORADO DIVISION OF MINERALS AND GEOLOGY Dlpartmrrli of hLWral Rewurt rf '- 1313 Sherman 51., Room 215 Denver, Colorado 802(13 C' O L O RA D O I'hona (ion e6rt3sa7 D ~ I S I it N ll i ,xi I N E R A L S F^%:1)071 83Id 106 GEOLOGY ail lr~MAIION•N~NING Date: July 5, 2006 '""""°"" 9JI OwMf rgNlnlDr 'To: Deb Gonima, Carl Mount RuaellGMrge E~ecuuve Dircvy<w prom: Tom Schreiner RMald W. Cananv p r`a"D„a,« Nu~ral Reuwrcr irusree RF,: "2°d Adequacy Review Coomments ", Siegrist Pits/Del Camino Pro erti Permit tio. 1t-1982-015, Class: Revision Type-Seq.: AM-1 p es Listed below are 2nd adequacy review comments on the above amendment application, based upon the Division's review of documents received on June 13, 20(X3 and June 3R, 2006. Please note that the applicant has resoh~ed Items 2, 3, 4, 7, R, 9, l0. 12, 13, 14, l5, 16, 17, 18, 19, 21, & 22 from lbm Schreiner's May 22, 2006 adeyuacy review memo to llch Gonima, Carl Mown. [toms 1, 5, 6, I l . & 20 from the May 22, 3(106 memo require either clarification or additional information. 6.4.3 EXHIBIT C' --Pre-'11inlne and Minine Plan blao(s) of 4ffectcd i ands I. The Applicant states that [hey have submitted a revised copy of the Storm water Management Plan, howcv cr the copy submitted appears to he the same version that was sent with the original application. Did the Applicant intend to send a revised stormwater management plan? Please clarify. Also, fn the adeyuacy comments the Division refers to Storntwater Management Plan mates not the Stormwatcr \'lanagcment Plan itsell: Where new maps suhmitted, and if so which maps should the Dlvision refer to. If nut, the Applicant will need to submit the maps reyuested. Please c loci fy'. bA.S EXHIBIT F: - Reclamation Plan 3. 'The "Supplemental Grotcchnical Engineering Report" prepared by Tcrracon fn Amendment .Application submittal indicates that the slurry cut-otTwails should be "keyeJ" or "socketed" into .._ the relatively impermeable competent•intact claystone or sandstone bedrock to rcducc -- groundwater seepage, The report further states that supplemental coring and packer permeability testing in the area of E3oring Numhen J5, 47, & 48 indicated that the upper 5 to 10 feet of the sandstone layer was moderately to sevcrch~ fractured and that "keying" or "rocketing" into this _- tope of sandstone; bedrock cuuld result in excessive seepage losses, and that deeper keyways for ... the slurry'cut-off walls will Irkely he rcyuired in this area. . .. Ofilcr of Office of Colorado „„ Mined land Redamabon Active and Inac Uve Mmes /:wnlne~. al c,.,..,,