2002-07-25_REVISION - M1983208 - Laserfiche WebLink

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EXHIBIT D MINING PLAN [Rules & Reps §6.4.4] CONSTRUCTION MATERIAL REGULAR 112 OPERATION FILE No M 1983 - 208 NW'/. SEC 17, T48N, R10W ~SHAVANO GRAVEL" January 2002 - 712 Amendment (revised 72 July 02) [a] Open pit mining operations shall be employed at this site, utilizing tracked bulldozers to extract and pile the gravel resources and wheeled front-loaders to load the processing equipment hopper. Extraction shall be at full depth of the gravel deposit resource, and at full width of the unit being currently mined, beginning from the previously mined central portion of the permit azea and progressing first to "daylight" the excavation out to the southwest edge of the mesa-top, then proceed southeast to the permit mining limit. An existing access road from Colorado Hwy 90, having a historic perscriptive easement across US Government lands in the NE%a NE%a of Section I1, serves the northwest corner of the cun•ent permitted (112) mining operation, and continues through the site to the Shavano Cemetary, adjacent to the east boundary of the site. A future alternate access route from Popular Road may be considered at a later date for implementation (Technical Revision) at the southwest wrner of the permit azea. The northwest end of the mesa-top beazing the alluvial gravel resources has been previously mined and revegetated outside of the current 112 permit area. Northern portions of the current permit area have likewise been mined, and portions of the mined-out pit floor are currently used for stockpiling equipment, storage, and process equipment operation, and other production- related activities. Processing activities shall continue to be performed in the worked-out portions of the former mining excavation that are adjacent to the resources to be mined. Products aze to be stockpiled north and west just outside of the production operations areas. Mining excavation, when resumed, shall be extended west to the property boundary, then southerly and easterly from the present excavation. The existing access road from Colorado Highway 90 to the northwest boundazy of the site averages approximately 23 feet wide, and shall be used for operations access in its present orientation and condition without widening nor up-grading. Only normal maintenance grading and surfacing only shall be conducted upon this access route. The majority of site's storm water runoff shall drain internally for infiltration into thegravelly soils in lower portions of the excavation. Equipment fuels, lubricants and coolants shall be temproarily stored intermittantly within the permit azea, per local and State spillage containment procedures. Normally such products are to be dispensd from service trucks, which are based at the off-site County shop facility. No acid, toxic, nor hazardous waste products shall be involved in the proposed action. A portable truck weight scale may be intermittantly located convenient to the access/haul route at the northwest end of the site. All processing equipment within the site is portable. There are presently not any, and shall not be any shop or maintenance buildings, adits, ventilation shafts, or other mining structures at the site, aside from the portable production equipment. [b] Topsoil, averaging 6 inches in depth, together with surface vegetation shall be first stripped from mining areas using wheeled front-loaders or tracked bulldozers, and placed in stockpiles outside of the operations and stockpile areas of the worked-out pit. Such stockpiles shall be seeded for vegetative cover stabilization with the critical area seed mix (see Exhibit E). Overburden from beneath the topsoil in depths of from one and one-half to two feet shall be left in place and incorporated in the mined gravel to provide the fines required for the specified gravel mix. 12