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19. Page 7-12-156 depicts culvert dimensions for the postmining drainage control plan. Two <br />culverts modeled by the Division using SEDCAD+ are greater than what was estimated <br />by Seneca. Seneca estimated a required diameter of 18" for culverts 3A and18A. The <br />Division estimated a diameter of 30" for culvert 3A and 36" for culvert 18A. Please see <br />attached SEDCAD+ calculations for further detail. Please clarify this discrepancy. <br />20. In Exhibit 7-19, Seneca includes a number of stocktanks and ponds in the postmining <br />drainage configuration. Please note that all proposed permanent impoundments must <br />meet the requirements of Rule 4.05.9 before they can be approved by the Division. <br />21. Exhibit 7-20, sheet 14 of 23, includes two elevations at 7300 feet (SIIPM-14 channel <br />profile). Please revise the cross section elevations accordingly. <br />The revision decision due date is July 13, 1998. Please respond to these concerns prior to this <br />date. <br />Sincerely, <br />~~~ ~ ~ <br />Erica S. Crosby <br />Environmental Protection Specialist <br />Enclosure(s) <br />cc: Mike Boulay <br />David Berry <br />Larry Routten <br />c:\esc\seneca2\980527 <br />