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Mr. Dan Matbew.r <br />Division ofMineratr and Geo%gy <br />Page 2 <br />Soil Group for reclaimed arear would be `C"' ar appored to `NA': Please update a/I Hydrologic <br />Input Parameters tab/es accordingly. <br />Response: The Hydrologic Input Parameter tables have been revised to include necessary Curve <br />Number, hydrologic soil group and vegetation cover condition documentation for each <br />subwatershed. Watersheds classified as roads do not have vegetation cover or hydrologic soil group <br />input paameters. Therefore, "NA" is applicable in select instances. Please note that SCC used <br />hydrologic soil group value `B", not "C" as suggested in the Division's comment. As noted in SCC <br />response of Octobet 21, 2004, to Item 24 of the Division's adequary comments for TR-45, soils <br />typically found in the north mining block were silt loam and loam soils. Haan, et al., in the text <br />Design Hydrology and Sedimentohgy for Small Catchments (C.T. Haan, B.J. Barfield and J.C. Hayes, <br />Academic Press, San Diego, 1994) suggest that silt loam and loam soils display characteristics of the <br />HSG type B. The Hydrologic Input Parameter tables (as well as the SEDCAD demonstrations) have <br />been revised to reflect the approved curve number for reclaimed conditions. Please see Table 13-1 <br />for the approved curve numbers and assodated hydrologic inputs for reclaimed conditions. The <br />revised information is included in this response package. <br />d Several errors were noted on Table 13.6-2, Ridgekne Acterr Road Ditch Summary ar follows: <br />Velocity bared on maximum dope for Channe10+00-7+SO rhould be 4.8 <br />Third channel segment krted rhould read 15+50-29+00. <br />Slope for channel segment 29+00-33+25 rhould read 0.5-2.0. Vekcity it given far minimum rkpe <br />and rhould be bared on maximum rope. <br />Veladty bared on maximum dope for Channel83+00-94+35 rhould be 3.4. <br />Slope for channel segment 110+85-117+00 rhould nod 4,O~i.0. Velocty i.rgiven for minimum dope <br />and rhould be bared on maximum dope. <br />Please amend the table to rorrect the errors. <br />Response: Table 13-6-2 has been corrected and is included in this response package. <br />e. The Road Ditch SEDCAD demonstration for segment 15+SO-29+00 hat an erroneous page <br />indicating station 1 S+SO-38+00. Please correct this discrepancy. <br />Response: The SEDCAD demonstration for segment 15+50 to 29+00 has been corrected. An <br />updated SEDCAD demonstration for the ridgeline road has been included with this response <br />package. <br />f. Then an many inconrirtencier with new and revdred culvert information submitted with this application. <br />Please amend the various Exhibits, Tables, and SEDCAD demonstration <br />Attachments cited below, as appropriate. <br />Exhibit 13-26.1 shows Culvert A5 (plan view and culvert schedule) and the new SEDCAD <br />demonstration in Attachment 13-7 indicates that this rhould be Culvert SA. <br />Response: The SEDCAD label for culvert AS has been corrected. <br />