2005-10-24_REVISION - M2000016 (2)

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TETRA TECH RMC October 24, 2005 Mr. Carl Mount Division of Minerals and Geology Department of Natural Resources 1313 Sherman Street, Room 215 Denver, CO 80203 'L~~') .._, ~::f r_ ~._.. . ~CT 2 ~ 2C05 i9fy1~ l ~~ RE: Seventh Adequacy Review Response, Lafarge West, Inc. Riverbend Operation 112c Permit Amendment Ol, Permit No. M-2000-016 t/ Deaz Mr. Mount: On behalf of Lafage West, Inc., we are writing to request a waiver of the 90 day decision rule for this application and request that the October 27, 2005 decision date be extended until November 4, 2005. Pursuant to MLRB Rule 1.4.1(9), we require additional time to provide the supplemental documentation requested (signed agreements with the Lupton Bottom Ditch Company and Brighton Ditch Company) in the Division's Seventh Adequacy Review. Below, we have provided responses to address the Division's concerns raised in the seventh adequacy review dated October 11, 2005. Below you will find the Division's comments are quoted in italics and followed by our response. ADEQUACY REVIEW #7 1. In an attempt to fulfill the requirements of Rule 3.1.6(1) of the construction Materials Rules and Regulations, which requires that disturbances to the prevailing hydrologic balance of the affected land and to the surrounding area and to the quantity and quality of water in surface and groundwater systems both during and after the mining operation and during reclamation shall be minimized, the division has been working with Lafarge and Tetratech RMC to establish a monitoring plan that should protect the interests of well owners and vegetation in the area of the project. On October 6, 2005, a meeting was held at the Denver office of the DMG to address these issues. A monitoring plan with mutually agreed upon monitoring well locations and time schedules relative to mining at the site was established. Please submit the monitoring plan established as a result of this meeting. The revised monitoring plan was submitted to the Division on October 12, 2005. Since that submission we had a conference call with Carl Mount on Tuesday, October 18, 2005. The Division requested that, recharge basins be installed on the north side of Cell 1, Phase 7 and the east side of Cell 1, Phase 8 to mitigate anticipated disturbance of the prevailing hydrologic balance. As such please refer to the revised Attachment A Lafarge North America 1900 5. Sunset Street. Suite I-F, Longmont, CO 80501 Tel 303.772.5282 fax 303.665.6959 www.ttrmccom