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<br />swell factor of 26X can be verified by the applicant's and the Division's <br />experience in the Twentymile Park Basin. <br />1. The Division is, however, concerned with the volume of material in <br />the stockpile and surrounding area that will be used as the spoils <br />backfill. The applicant states that approximately 1,128,000 bank cubic <br />yards will be needed to backfill the portal pit. According to the <br />application 986,000 cubic yards are available from the temporary <br />overburden stockpiles leaving a deficit of 142,000 cubic yard a. The <br />applicant intends to scrape overburden material surrounding the pit area <br />to make up for the deficit 142,000 BCY. However, there are no <br />calculations to verify how much material is stockpiled and no explanation <br />as to why there is a deficit of material considering the swell factor. <br />Calculations verifying the amount of stockpiled materials are needed. <br />Regarding the deficit material further discussion is necessary. Why is <br />there a deficit and how was the figure determined? Will there be cuts in <br />the surrounding area to obtain the material and if so, how many acres <br />will be affected? <br />2. There is no mention of grading technique with regard to compaction <br />effort or lift height. This concern is primarily to address the problem <br />of saturation due to ground water inflow. Minimizing permeability and <br />porosity will substantially decrease the volume of water saturating the <br />backfilled pit. Please provide a discussion of the method of compaction <br />and grading techniques. <br />3. The map reference on Map No. 13, Cross-Sections is incorrect. The <br />-37- <br />