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MINING PLAN EXHIBIT D(CONT) <br /> The slurry walls will be certified and become liners to block <br /> groundwater from entering the excavation areas . This reduces the <br /> amount of evaporative loss replacement water needed during <br /> mining. This certification will be obtained as soon as possible <br /> after installation is complete . If needed, a Temporary Substi- <br /> tute Supply Plan will be obtained from the Office of the State <br /> Engineer prior to exposing water and will remain in effect until <br /> advised by the Office of the State Engineer that is not needed. <br /> No blasting will take place on this mine . <br /> As mining progresses across the property, additional area will be <br /> stripped ahead of the mine face and any topsoil encountered will <br /> be stockpiled along the east and south sides of Stage 2 , for use <br /> when reclamation begins . The salvaged topsoil may also be used <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. Please see MAP EXHIBIT F - RECLAMATION PLAN MAP <br /> for the approximate shape 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 OSE 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. <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 25 feet east of the <br /> Bull Seep this leaves a 152+ feet wide undisturbed area from the <br /> edge of the dig line to the slurry wall . To our knowledge mining <br /> can take place within 15 feet of a slurry wall and in most cases <br /> this happens where a slurry wall is installed around a gravel <br /> mine prior to mining. This common practice in the industry has <br /> proven the by leaving a stable insitu gravel slope adjacent to <br /> 9 <br />