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..~'J'. C®14L`' ";. ~ COP1lPAfUY Ms. Candace M. Thompson Colorado Mined Land Reclamation Division 423 Centennial Building 1313 Sherman Street Denver, CO 80203 5731 State Highway 13 Me=~:er. Coioraoo Bi6dt (303 824-4451 February 7, 1986 SUBJECT: Explosives Magazine Construction Certification-File (JO. C-019-81 Dear Ms. Thompson: Attached for your review is the Certification of the final construction of the new explosives magazine approved by the Division as a Technical Revision on July 5, 1984. The construction of the explosives magazine and access road was initi- ated in 1984 and completed in 1985. In addition to the Certification, the following map titled "Explosive . Storage Area" is included for your information. The design specifications in the approved plan were met or exceeded during construction. A minor design change was implemented in regard to the surface drain- age structures in the vicinity of. the three explosive storage pads. The surface drainage from the storage areas was originally designed to flow north along the access road leading eventually to the work area pond. However, due to the topog- raphy of the area, surface disturbance was held to a minimum by directing surface drainage from the explosive storage pads east into the pit rather than north along the access road. This drainage design resembles the old magazine drainage which also drained into the pit area. Since less than half of the original design area drains to the north, the constructed drainage structures easily meet or exceed the drainage control requirements of the approved plan. If you have any questions concerning the construction of the Explosives Storage Magazine, please call at your convenience. Sincerely, JAK/yml ~_ Attachment cc: R.G. Atkinson Central Files COLOWYO COAL COMPANY ames A. Kiger Reclamation Specialist