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• HYDROLOGIC DOCUMENTATION <br />SMALL AREA EXEMPTION <br />FORMER TURNAROUND AREA <br />The following calculations demonstrate [he amount of sediment fence surface area required to <br />adequately handle the runoff from the former turnaround area and undisturbed upland area. <br />Runoff peak discharge calculations were performed utilizing the SEDCAD+ computer model <br />consistent with the methodology previously discussed in this Exhibit. The sediment fence wu <br />designed to handle the peak discharge from a 10-year, 24hour storm event, <br />H dv rology Inputs <br />The CN numbers used were obtained from Procedures for Determining Peak Flows in Colorado <br />and Technical Release No. 55. Based on soil type and vegetation cover, curve numbers were <br />determined for the following condition. <br />Undisturbed <br />Soil Type: B <br />Ground Cover: <30%, Poor <br />Cover Type: Pinyon Juniper <br />CN: 75 <br />• Disturbed <br />Soil Type: B <br />Ground Cover: Dirt Road <br />Cover Type: none <br />CN: 82 <br />All other hydrology inputs are shown on the attached SEDCAD+ computer printouts <br />Hydrology Results <br />Peak Discharge: 3.48 cfs <br />Sediment Fence Requirements <br />Sediment Fence Permittivity: 15 gal/min/ftz or 0.033 cfs/ftz <br />Required Surface Area: 3.48 cfs / 0.033 cfs/h' - 104 ft' <br />• <br />C\_WOTRIIAPP <br />ivani i~ Revised -November 1993 <br />