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10. Water use(6.3.3.(h)): Use water for dust control (traffic areas,crushing and screening) and potentially <br /> washing of product if required by customers. Pitrun material is expected to be moist to wet when <br /> excavated and processed. However, rock gleaned from fields is expected to be dry when collected, <br /> moved, and processed. Therefore,water consumption is estimated at 10 gallons per ton of production, <br /> for 360,000 tons maximum production. 11 acre-feet over 4-6 years (2.75 to 1.57 acre-feet per year), <br /> assuming recirculation of water used for washing material. This is equal to 0.36 acre-feet per acre per <br /> year(4.32 inches of precipitation per year). <br /> 11. Water source (6.3.3.(h)):Water will be obtained from irrigation water rights owned by the landowner, <br /> through a temporary substitute water supply plan, and from precipitation on the permit area.The water <br /> will be obtained from the irrigation ditch on the east edge of the permit area, and the retention basin in <br /> the southwest corner. <br /> 12. Groundwater(6.3.3.(i)):Without irrigation of the permit area, any high levels of groundwater during <br /> high water on the Rio Grande are expected to recede.Therefore,groundwater is not expected to be <br /> exposed in the excavation.The storm water system will collect and convey runoff which does not <br /> immediately infiltrate to various temporary detention basins,where it will infiltrate and recharge <br /> ground water.There are no recorded wells within 1,000 feet in all directions. a <br /> 13. Compliance with water law (6.3.3.(j)):As discussed in items 11 and 12 above, <br /> 14. Refuse/acid/toxic materials (6.3.3.(k)): No refuse, acid-producing,or hazardous chemicals/substances <br /> are expected to be exposed during mining operations. All fuel, lubricant, coolant, and similar materials <br /> used by equipment on the Site shall be stored with secondary containment, and in accordance with the <br /> CAS spill response plan. <br /> 15. Waste (6.3.3.(k)):Solid waste generated on-site will be disposed of at a permitted landfill.This includes <br /> any petroleum-contaminated soil from releases or leaks.The site may accept clean fill (earth,crushed <br /> Portland cement concrete, cured asphaltic cement concrete, and rock)to process for aggregates and/or <br /> use for beneficial fill to achieve final grade.The site may accept logging debris (wood waste)to use as <br /> mulch/soil amendment in reclamation. <br /> 16. Hydrologic balance (6.3.3.(1)): Based on review of the terrain,water rights, irrigation,wells, and related <br /> information,the Site is expected to have very minor impacts on the water balance in the immediate <br /> area or downstream on the Piedra River. <br /> 17. Prevention of off-site damage (6.3.3.(1)):The terrain, combined with the shallow nature of the proposed <br /> mining, and setbacks of more than 300 feet from significant manmade structures and terrain features, <br /> there is no significant potential for off-site damage to infrastructure, buildings and other structures,or <br /> users of those features. <br /> 18. Stability of terrain (6.3.3.(1)):As with item 17 above, slopes of 2H:1V or flatter are not expected to create <br /> problems with stability of the land within or outside the permit area. <br /> 19. Processing on-site (6.4.4.(m)):As discussed above, materials will be processed (crushed, screened, and <br /> possibly washed)on-site using portable plants located and operating intermittently on-site,with no <br /> permanent structures. No chemicals will be used. Plants will be permitted in accordance with Colorado <br /> air quality and other regulations. <br /> 20. Primary products (6.3.3.(n)): aggregates (sand and gravel) and borrow material (earth)for use as <br /> construction materials. Soil will NOT be sold. Most fines screened/washed out will NOT be sold. <br /> 21. Secondary products (6.3.3.(n)): no secondary products are anticipated. <br /> 22. Incidental products(6.3.3.(o)): no incidental products are anticipated. <br /> 23. Explosives (drilling and blasting) (6.3.3.(p)): no drilling and blasting will be conducted at the Site. <br /> M2020-062 Schoen Farm 110c Application by O'Rourke Excavating, Inc. Exhibits Page 8 of 21 <br />