2006-09-21_REVISION - M1980149 - Laserfiche WebLink

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~~--~g-a~s~~ SFp 21 20116 EXHIBIT D Mining Plan Division of Reclamation, Nunuiy rnd Safety This application proposes to amend the existing Hokestra permit (M-80-149) by changing the reclaimed use of the site from wildlife habitat to developed water resources. The resource will continue to be mined and processed by Weld County. The permit boundary will not change under this proposed amendment. The boundary includes 120 acres and is bounded on the north by the St. Vrain Creek, the frontage road for Interstate 25 on the west, and to the east and south aze previously mined properties. Mining will occur in phases and it is anticipated that mining will occur over the next 20 yeazs. Approximately 71 acres of the pernritted land will be mined. Mining occurs intermittently on site when local road projects dictate the demand for the resource. Sand and gravel will remain the primary product produced from the Hokestra site. The principal intended use for the sand and gravel is construction aggregates. The Weld County Service Center is located south of the property. The dominant non-mining land use surrounding the property is agriculture. Current mining operations have verified that the Hokestra Pit property contains a significant commercial deposit of sand and gravel. The sand and gravel deposit varies from 8 to 25 feet deep across the site. Topsoil and overburden range from half a foot deep neaz the river to 3 feet deep further south on the site. Claystone bedrock underlies the sand and gravel deposit. The Last Chance ditch flows across the site from west to east near the center of the permit boundary. The current Hokestra permit requires maintaining a boundary of 50 feet from the ditch. Previous mining maintained a 75 to 100 foot mining setback from the ditch. The operator has, and will continue to, maintain a 150 foot minimum setback from the St. Vrain River as described in the original application materials. The south bank of the St. Vrain River has been protected by riprap throughout the project site. In all other mining azeas, a minimum 40-foot setback will be maintained from the permit boundary unless slope stability calculations indicate this is too conservative. Mine Phasine The mining will occur in three Phases. Phase II is almost complete and consists of 39 acres of minable azea. Phase III is anticipated to mine 10 acres and to be complete in the next 5 yeazs. It is anticipated that the 22 acres of mining contained in Phase IV will be complete in 10-15 yeazs. Phase I was released in 2001. It consisted of approximately 22 acres. Phase II The northwest portion of the permit azea (designated as Phase II) is mined except for a small forger in the south of the pit and a berm along the north of the cell. This azea should be mined completely by the end of 2007. Water will be controlled by trenches and pumps. The proposed amendment would reclaim the Phase II azea as a developed water storage reservoir. The reservoir would be lined with an engineered compacted clay liner. The material would meet engineered standazds and comply with SEO regulations and DRMS recommended specifications. Weld Counry Hokestra Pit DMG 112 Permit.4merafinext Page 4