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,- __ _~-~ ~ T,- OF COLORADO DIVISION OF MINERALS AND GEOLOGY III I II IIIIII IIII III Department of Natural Resources 999 1313 Sherman St., Room 215 Denver, Colorado 80203 DIVISION O F Phone: 1303)866-3567 MINERAL S FAX: 1303) 832-8106 $i G E O L O G Y January 8, 2002 RECLAMATION . MINING•$AFETY Rill Owens Steve Fancher governor Loveland Ready Mix Concrete, Inc. Greg E. Wal<her Eaecuove Director P.O. Box 299 Michael R. Long Loveland, CO 80539 Dwi;.on Duecbr RE: Green/Croissant Property, Technical Revision No. 1, File No. M-2001-022 Dear Mr. Fancher: The Division has received your December 20, 2001 revision request for the Green/Croissant Property. Listed below are review comments pertaining [o [he groundwater monitoring program and reconfiguration of mining ce114 to avoid the Big Thompson River floodway. Additional comments from Allen Sorenson regarding the stability analysis for the Duke Energy and Sinclair Pipelines will be forwarded to you as.soon as available. Also, per your request, the Division confirms that subsequent to the processing and approval of the current revision request the only outstanding adequacy review issue that is still subject to a future technical revision is [he incorporation of costs and possibly plans produced for wetland mitigation purposes. As a reminder, Loveland Ready Mix Concrete, Inc. has already committed to no wetlands .. creation, mitigation, or enhancement within the permit azea until such time that the Division has approved a wetlands reclamation plan for the Green/Croissant Property. Groundwater Monitoring Program: 1) The applicant proposes to collect monitoring data on a quarterly basis for a reasonable period of time prior to mining and concurrent with mining, for the life of the mine. The Division agrees with the frequency and duration of groundwater monitoring proposed. The Division also recommends [he operator collect 4 quarters of baseline groundwater data prior to exposure of groundwater at the Green/Croissant Property. If 4 quarters is not feasible, then 3 monthly measurements (within a quarter) is desireable. The 3 measurements could be used to provide a representative or average measurement for at least l quartet Tf 3 monthly measurements are not feasible, then perhaps 3 measurements in one month should be secured prior to exposure of groundwater. Please respond. 2) The Groundwater Monitoring Program map (sheet 3 of 3) provided shows monitoring wells MW-1, MW-2, and MW-3 in a row. The Division recommends the operator consider installing a 4`h monitoring well, MW-4, in a location to help confirm the direction and gradient of groundwater Flow at the Green/Croissant Property. Such a location [hat might be considered is the northeast corner of Cell 3 or northeast corner of Cell 4. Attached is a copy of technical information from Basic Groundwater Hydrology that will help to illustrate this issue. Please respond.