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~~ Banks and Gesso, LLC ~~ June 18, 2001 Mr. Chris Gathman Weld County Department of Planning Services 1555 North 17'" Avenue Greeley, CO 80631 720 Kipling St.,Suite117 Lakewood, Colorado 80215 (303)274-4277 Fax (303) 274-8329 www. banksandgesso.com RE: Nix Sand and Gravel tAAin? Response to Referral Comments from CGS Review No. WE-01-0068 Mr. Gathman We are in receipt of a copy of the referral comments from the Colorado Geological Survey, received by your office on June 11, 2001. We would like to take this time to respond to the concerns raised by the CGS in that correspondence. Flooding. The Applicant has prepared a Flood Hazard Development Permit for the subject site and has submitted this application to the County for approval. Groundwater. The Applicant is aware of the possibility of disturbing subsurface hydrologic conditions as a result of mining activities. As such, Owens Brothers has prepared a Substitute Supply Plan and submitted this plan to the Office of the State Engineer, Division of Water Resources, for approval. This plan addresses augmentation possibilities concerning potential losses in subsurtace groundwater supplies and other changes in the hydrologic conditions surround the subject property. Proof of approval of this plan will be forwarded to your office upon receipt. Ground Stability. The pit slopes will be excavated to a 1:1 slope and backfilled to a 3:1 slope to approximately 10 feet below water line. From 10 feet below water line to the pit floor, the pit wall will be backfilled to a 2:1 slope. As required by the Division of Minerals and Geology, it has become common practice to enter into agreements with owners of permanent manmade structures within 200' of the mining limits. The petroleum facilities of concern to the CGS are considered permanent manmade structures. As such, the Applicant is actively pursuing surface- use-agreements with the appropriate oil and gas companies to allow for mining in the vicinity of their facilities. The Applicant will not perform any geotechnical investigations as to the stability of the proposed slopes unless it is a required condition of a mutually agreed upon surtace use agreement with the appropriate oil and gas companies. We hope this satisfactorily addresses the concerns of the Colorado Geologic Survey. If you have any further que tions or concerns, please call me at (303) 274277. Sincer ly, Tug n Planner Cc: Celia Greenman, Colorado Geologic Survey Bill Owens, Owens Brothers Concrete Tony Waldren, Division of Minerals and Geology 20075 -Agency Correspondence