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C <br /> MINING PLAN EXHIBIT D(CONT) <br /> on areas ready for resoiling or placed in topsoil piles around <br /> the mine perimeter for use when reclamation begins in the area <br /> where it was removed. ALBERT FREI & SONS AGREES TO SALVAGE ENOUGH GROWTH <br /> MEDIUM TO RESOIL THE AFFECTED LANDS WITH A MINIMUM OF 8 INCHES AVERAGE . <br /> Please see MAP EXHIBIT F-RECLAMATION PLAN MAP for the approximate shape <br /> of site when reclamation is complete. <br /> The material to be mined will be damp so no unusual dust control <br /> problems are expected. An estimate of water needs for the mine <br /> is outlined in EXHIBIT G-WATER. The actual amounts needed will be <br /> addressed when we apply for the Senate Bill 120 Well Permit thru <br /> the Office of the State Engineer (OSE) . Most water will be used <br /> for dust control on haul roads and the processing site. On a <br /> typical operation of this type, 3 to 8 ac-ft per year is used. <br /> The SEO requires mine operators to use an amount of 4% by weight <br /> with the exported gravel for those area lying below the water <br /> table . A processing plant will not discharge anything that would <br /> affect the surface or ground water quality except dirty water. <br /> This water will be directed to the excavated area in Stage 1 and <br /> contained on the mining area. A GROUNDWATER MONITORING PLAN THAT <br /> ADDRESSES POTENTIAL IMPACTS RESULTING FROM THE PLANNED SLURRY WALLS IS PROVIDED <br /> IN THE APPENDIX. <br /> The City of Thornton has installed a slurry wall along the west <br /> side of the property. This lies west of the Bull Seep/Spring <br /> Ditch area and with the mining setback being 38 feet east of the <br /> Bull Seep this leaves a ±52 200+ feet wide undisturbed area from <br /> the edge of the dig line to the slurry wall . To our knowledge <br /> mining can take place within 15 feet of a slurry wall and in most <br /> cases this happens where a slurry wall is installed around a <br /> gravel mine prior to mining. This common practice in the <br /> industry has proven the by leaving a stable insitu gravel slope <br /> adjacent to the wall will prevent any damage to said wall . By <br /> ±eaving 200 feet instead of t5 feet the safety factuy ±s <br /> The setback lines on the map are the indication of the mining <br /> limits, i .e. , the top of the slope into the mining area. When <br /> the setbacks will no longer be disturbed they will be reclaimed <br /> as prescribed in the reclamation plan. <br />