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12. Page 169a of the revised text lists the location of the cross section of the East <br />Collection Ditch on Exhibit S5. It does not appear that the cross section is on Exhibit <br />S5. PCC needs to provide us with a cross section of the ditch. <br />13. In the model inputs for Pond 11, PCC used an emergency spillway elevation of 4869.6. <br />Exhibit 55 shows an elevation of 4869.4. Which elevation is correct. PCC should <br />correct or clarify the elevation value that is erroneous. <br />14. PCC needs to make some sort of commitment to removing sediment from and <br />dewatering the pond at a certain level and/or installing indicators of maximum <br />sediment and water levels that can be reached without compromising the storage <br />capacity for the 10 year - 24 hour storm. There must be adequate storage so that no <br />runoff from a storm event less than the 25 year - 24 hour event would pass through the <br />emergency spillway. PCC should also ensure that the pumping plan provides for <br />adequate detention time prior to discharge so that effluent limitations will not be <br />exceeded. <br />If you or the operator have questions or need more information, let me know. <br />c: Larry Routten <br />si.a\ozuvn.wr <br />m:\coal\slb\027A94.wp <br />nca rosy 3 e ruary , 1 4 <br />