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- ~-A <br /> <br />The mine plan needs to assume some subsidence will occur in areas with <br />overburden thickness of over 800 feet and take the necessary precautions <br />to protect the hydrologic balance, along with buildings, structures, etc. <br />To determine potential impacts to the local unconsolidated (alluvial- <br />colluvial) aquifers, the total saturated thickness of the aquifer should <br />be subtracted from the overburden thickness, as subsidence cracks <br />migrating to the bedrock-alluvium/colluvium aquifer boundary could <br />dewater the aquifer, affecting springs, etc. <br />Section 2.05.6, pages 163, 164, etc. CWI states that they have made a <br />determination that material damage or diminution of foreseeable use would <br />not occur as a result of mine subsidence. How is this determination <br />substantiated (i.e. supporting data, previous studies, etc.)? <br />15. The location of soil sample sites should be indicated on Map 9-3 of soil <br />types. Also the depth to which the operator proposes to strip topsoil <br />within each area of disturbance should be indicated on Map 9-3 or <br />another map of the same scale. <br />16. Soil productivity is not discussed other than by listing of soil <br />capability units for agricultural use. Present and future soil <br />pr,..:~ctivity should be discussed in relation to post mine land <br />use. <br />17. Section 2.06.1(5) states that no !+rime or unique farmlands have been <br />identified within the permit area. This is not true. The portion <br />of the permit area south or downslope of the Fire Mountain Canal is <br />classified a prime or unique farmland by the SCS. <br />t <br />~~ <br />i~- <br />