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Area (acres) <br />Design Event <br />Design Precipitation <br />Average CN <br />Description <br />Calculated Runoff Volume (Q) <br />Calculated Runoff Volume (acre -ft.) <br />Ponding Percentage <br />Actual Runoff Volume (acre /ft.) <br />33.4 <br />100 yr. storm <br />2.8 <br />60 <br />Porous Gravel and <br />Topsoil Piles <br />0.26448087432 <br />0.73613843352 <br />10 <br />0.66252459016 <br />Calculated S <br />6.66666666667 <br />This pond has a surface area of 0.20 acres therefore, its required depth is 3.30 feet to hold 0.66 acre <br />feet volume. It will be dug 3.5 feet deep with 2H:1V sideslopes. The pond and ditches will be dug <br />prior to any new activity in the western portion of the permit area, therefore, no discharge from the <br />site will take place. For this reason, no NPDES permit is required. <br />All water from the excavated pit that is pumped will be used in the sluice plant or pumped to the <br />Plant Settling Pond or the Plant Infiltration Pond. No water can leave the site from these ponds due <br />to the extreme porous nature of the gravel, which will result in full infiltration. <br />Section 8.0 Access Road <br />One existing access is present on the site, which is a compacted dirt road that runs south to a T inter- <br />section with the local dirt road named Platte Drive, which goes east and west. The western direction <br />will lead to Highway 9, which will be the truck route for almost all activity in and out of the site. <br />The access road in the permit area will be compacted dirt or gravel and approximately 30' in width. <br />Water or magnesium chloride will be applied to this road (primarily by the gravel mine personnel) to <br />keep dust down while mine vehicle traffic occurs. <br />Gloria Z Mine 2013 Amendment 19 <br />