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9.69 feet (Elev. 6577.69). Tables 6 and 7 wntain the hatch input <br />data file arxi the copal file from the SIDIhIO'P II analysis, <br />respectively. 'this peak stage (9.69 ft.) indicates that no flow <br />world occtu' thrax~i the emergency spillway (stage 12.0) . The <br />principal spillway is of sufficient size to handle the d;~-hare froza <br />the 25-year, 24-hour storm event at a peak discharge rate of 0.42 <br />cfs. 'Ills existing emergency spillway will act as a safety factor for <br />Pond 003 and is a trapezoidal channel with 3H:1V side slopes aryl <br />bottom width of 10 ft. Table 8 contains a rating curve mutation <br />for this spillway which shows it can conservatively handle the peak <br />d i crhame5. <br />The Nortln~est IZ[gxxurt[~ent (No. 003) will remain as a permanent <br />incised impoundment after mining to conq~liment the postmine lard use. <br />~e pond will provide a depPSidable sarroe of water for livestock aryl <br />wildlife. Appendix 7-10, Tab 7, the Porn Abandormient Plan section <br />aryl .nrnm++ri i x 13-2 of Table 13 , and the Propoc...~i Decision and F; rrK rr~c <br />of Ctixg~lianoe Docimpnt for the record renewal of Seneca II Mine <br />Permit C-80-005 (11/20/92) contain discv_csions pertaini m to the <br />permaz~ence of this facility. The proposed permanent postrnine <br />Nort2n~st Impaurlment (No. 003) is shown on E:diibit 7-11A. <br />• <br />7-6b-6 Revised 12/10/92 <br />