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-- - • iii iiiiiiiiiiiuiii • ~-- ~ sss -= ~ TUTTLE APPLEGATE RINDAHL, INC. Consultants for Land and Resource Development RECEIVED May 12, 1987 MAY 131981 MINED LAND RECLAMATION DIVISION Mr. Eq Bischoff Mined Land Reclamation Division 1313 Sherman Street, Room 423 Denver, CO 80203 RE: Technical Revision for C. Ryan and Son, Leyden Pit Case File M-83-139 Dear Ed: In February, 1985, the Mined Land Reclamation Board granted a 112 permit for the Leyden Pit. The permit you have on file now allows two acres of mining to occur per month for a total of twenty acres per year. The bond amount is 132,000. In December of 1985, Jefferson County further reviewed the mining operation and put mots stringent controls on dust monitoring, noise monitoring, areas of disturbance, and truck traffic. Ryan and Son began commercial operation of Leyden Pit in August, 1986. Since its opening they have received an increasing number of requests from customers for different types of rock, especially concrete aggregate. These requests have prompted Ryan to review their mining plan in order to fill these customer orders. In March, 1987, Ryan applied to Jefferson County for an amendment to their planned development zoning. This request involved the revision of the mining phases, the permitting of mining to occur in three separate five acre tracts at any given time, and revision to the dust monitoring program. Therefore, we are requesting a technical revision to M-83-139 so your files can be updated to show three separate five acre excavation sites. We anticipate that two of the excavation sites will be located on the east side of the permitted atlas. These excavations will work from the east to the west. The third excavation site will be located on the west side of the permitted area. We have enclosed a map of the proposed technical revision which delineates the east side and the west side. l~ ~N~~~ ,~~~ ~I~~~ r 11990 Orant Street Suite 410 Denver, Colorado 80233 452-6611