2006-04-18_REVISION - M1980136 - Laserfiche WebLink

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Chambers Pit, Permit No. M-1980-136 TR-02 -Adequacy Review Response Page 2 ITEM 3 -The irrigation ditch shown in AREA E on Exhibit C appears to be relocated on Exhibit F. Who is the owner of the ditch and does the operator have permission to relocated it? If the operator does not own the ditch, the operator needs to provide proof that he has permission to relocate it. The irrigation ditch in question is owned by Eagle County. Eagle County has given Lafarge permission to relocate the ditch as detailed in Paragraph 10 of the Fifth Amendment to Sand and Gravel Mining Lease dated March 21, 2006. A copy of the lease is included as Appendix B. ITEM 4 -Numerous manmade structures are located either inside the proposed mining area or within two hundred feet of the proposed mining area. These structures include, but are not limited to, the baseball fields and associated fences, Fairgrounds Road and associated utilities, the buildings in the northeast corner of AREA E, and the existing/relocated irrigation ditch. In accordance with Rule 6.4.19, please provide information su)~cient to demonstrate that the stability of any structures located within two hundred feet of the operation or affected Zand will not be adversely affected. The DMG raised the question of several buildings located in the northeast portion of AREA E. These structures will be removed in accordance with Pazagraph 14 of the lease included in Appendix B. A question as to whether the stability of any structtues within 200 feet of mining will be affected was also raised. These structures include the baseball fields and associated fences, Fairgrounds Road and associated utilities, and the relocated irrigation ditch, all of which are owned by Eagle County. Lafazge has obtained a notarized agreement with Eagle County regarding damage to man-made structures within 200 feet of our mining pursuant to Rule 6.4.19 (a). Furthermore, it is Lafazge's position that mining activities will not adversely affect the structures in question given the present conditions. This position is based on historic evidence of the site's stability throughout the life of the mine. Previous phases of mining have encountered similaz structures with similaz set backs from mining activities with no adverse affects. Specifically, the existing run of the ditch along the north side of AREA D was mined vertically within approximately the same distance from the ditch proposed in AREA E and then backfilled to attain the 3:1 slope specified in the reclamation plan with no adverse effects on stability. The mine plan for AREA E indicates the closest mining will come to a major structure (Fairgrounds Road) is approximately 70 feet which will maintain a 2:1 ratio of distance to the structure verses depth of the pit. Such a ratio is typical of aggregate mining in Western Colorado. During mining and reclamation activities, Lafazge will visually monitor for signs of instability and take corrective actions as needed. The proposed extent of mining activities can be seen on Exhibit F which is included in Appendix A. A copy of the agreement between Lafazge and Eagle County regazding permanent man-made structures is included as Appendix C.