2006-12-05_REVISION - M2001035 - Laserfiche WebLink

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• Bill Tyner, Assistant Division Engineer C • Mike Graber, dam Safety Engineer • Bruce Smith, Water Commissioner, Water district 11. A letter was signed by Mr. Graber and Mr. Tyner that had the following conclusions: • Mining activities as described should not require a Substitute Water Supply Plan approved pursuant to Colorado Revised Statutes 37-90-137 (11)(a), but evaluation by the State Engineer's Office will be conducted as provided for under the statute. • Should conditions at the site change whereby there was exposure of ground water, saturation of or due to a desire by the operator of the gravel mining operation to being washing of material onsite or use of water from the site for dust control it would be necessary to obtain a Substitute Water Supply Plan approved pursuant to the above statute to continue any further mining operations. • ..., there appears to be minimal risk of a water rights problem with this point of diversion due to mining operations. • .... the excavation is expected to be entirely below the natural ground surface and no storing of water is anticipated, therefore there are no issues with construction of a dam or related safety issues. Item number 2 is recommended mitigation for the site but it is not within BLM's jurisdiction to enforce it, therefore it will be noted and a copy of this environmental assessment will be ~ " provided only as a courtesy to the Colorado Division of Minerals and Geology for their permitting process. The proponent is planning to obtain a Colorado Division of Reclamation, Mining, and Safety pemvt for the site locality. This will provide for additional analysis of mining, reclamation, and safety provisions required by the state permit. MTTIGATION MEASURES: 1. No initial disturbances of vegetation during the time period of May 15 to July 15, a primary bird nesting time period. Once the initial vegetation is disturbed, subsequent work can continue in these areas at any time of the year. 2. The applicant be responsible for the cost of control of any state or federally listed noxious weed that become established on the site as a result of the disturbance caused by the mining operation. 3. All fuel storage and refilling shall take place outside of water drainage areas. 4. Reclamation practices will be defined within the State DRMS permit. Bonding requirements will be identified within this permit also. 5. Once the quarry phase is completed, reclamation work maybe required to create a suitable soil layer for a seed bed and re-vegetation. Any artificial seeding should be done with native vegetation adapted to the site. 6. Maintenance and continued use of the public land for a detention basin should be authorized, probably by a Section 302 FLPMA lease. Since the mining activity creating the pit are authorized under the mineral material permit and with public compensation, 22