2002-04-12_REVISION - M1982147 - Laserfiche WebLink

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~'/Ylpbi7e Prerni~' ~`TZ? O l LAFARGE April 10, 2002 Ms. Erica Crosby Environmental Specialist Colorado Department of Natural Resources Division of Minerals and Geology 1313 Sherman Street Denver, CO 80203 Re: Nyholt/Mann Lake Pit, Permit No. 1982-147 Technical Revision No. 1 / Dear Ms. Crosby: /,Q~rp~ 778 X188.00 RECEIVEDNxholf pit APR 1 2 2002 -~ Division of Minerals and Geology This Technical Revision (TR-1) to Permit No. 1982-147 for the Nyholt/Nlann Lake Pit addresses the points raised in the Division's Notice of Possible Violation ("Notice") dated March 4, 2002 and in the report of the Division's site inspection conducted on February 27, 2002. This site inspection was requested by Adams County in its letter of concern to the Division on February 12, 2002. This TR-1 is submitted in accordance with the Corrective Action presented in the DMG site inspection report. The Notice identifies an area along the west side of the southern-most pit (Pond 3) on the property where mining occurred closer to the Brantner Ditch (located directly west and adjacent to the west boundary of the Mann Lake property) than prescribed by the approved mine plan. On inspection of both the Exhibit C, approved by the Division, and the mining map approved by Adams County in the Conditional Use Permit (both processes took place in 1988), it appears that there is a discrepancy in the required mining offset from the centerline of the Brantner Ditch. Where the offset in the Division-approved plan varies between 250- to 380 feet in the azea in question, Adams County approved (in both the County resolution and in the May 1988 Gravel Mining Lease with Mobile Premix Concrete, Inc.) an offset of 200 feet from the centerline of the ditch. Regardless of this discrepancy, mining did encroach on the 200-foot limit. The enclosed Drawing 1 presents the limits of the actual mining in the area in question on the west side of Pond 3. This area comprises the additional mining area requested in this TR-1. The mining offset from the centerline of the Brantner Ditch varies from approximately 140 to 170 feet. The additional area mined is approximately 5.4 acres. With respect to the mining stages and acres mined presented in the Amendment 1 Application to the DMG permit in 1988, the mineable acres for Stage 4 would increase to 62.40 acres (from 57.00 acres). The total mineable acres for the project would increase to 196.98 acres (from ]91,58 acres). Total affected acres for the project aze unchanged (at 268.51 acres) as the 5.4 acres are within the original affected acres. The Notice also mentions discrepancies with the reclamation plan, however, it must be noted that reclamation of Pond 3 is not yet completed. Mobile Premix (now being referred to as Lafarge West, Inc.) has had several meetings with Adams County since the Notice was issued to discuss WESTERN MOBILE DENVER, a subsidiary of Wfarge Corporation DENVER METRO AGGREGATE DIVISION 1400 W. 64th Ave., P.O. BOX 215001, Denver, Colorado 80221-0599 Office: (303) 657-4400 Fax: (303) 657-4413