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Twenrymi[e Coa[ Company - Foidel Creek Mine, TR04-44 TA Resyonses 8/71/1004 <br />Resnonse: As noted on the referenced page, soil salvage volumes are shown on Table <br />49A. Map 1 S has been revised to show soil stockpileJwindrow locations, and the text has <br />been revised to clarify source and stockpile/windrow relationships. <br />Item 34, There can be no disturbance within 100 feet of Fish Creek (a perennial stream) <br />unless the Division makes the findings required by Rule 4.05.18(1). Buffer zones need to be <br />marked in compliance with Rule 4.02. S. In addition, the wetland at the start of the access <br />road should be protected [Rule 4.18(5)(e)J. On page 2.05-45.3, between lines 19 and 20 <br />(after completion of environmental and engineering investigations and before temporary <br />drainage and sediment control measures, please add "Marking ofstream and wetland <br />buffer zone ". The markers should be placed along any 100 foot buffer limit wherever <br />disturbance is within approximately 300 feet of Fish Creek and the wetland, and be <br />indicated on the construction plan drawing ofltem 30. <br />Response: The referenced text has been revised to reflect marking the buffer zone. <br />Item 35. Page 2.05-45.3, line 3 of the bottom paragraph. No Exhibit 4 was found in the <br />application. Thus the review of the road is incomplete. Please provide this exhibit. and <br />validate its designation as Exhibit 4 ofthe PAP. In anticipation of this Exhibit, it should <br />include both a plan and profile of the road, and specifications thereon in compliance with <br />the recommendations of Exhibit 8T. <br />Resnonse: "Exhibit 4" is an incorrect reference. The text has been corrected to refer to <br />Exhibit 25T and a new road profile and cross-section, Map 24-CD1 <br />Item 36. Comment. As indicated in Exhibit 8T and as experience has demonstrated, <br />culverts are frequently filled in with some sediment. The culverts sized in Exhibit ST have <br />been oversized to 18 inch. To permit some level of sediment in the culverts (to reduce <br />maintenance), you may want to provide a schedule in the application that allows sediment <br />to attain a level that still accommodates design flows. This procedure reduces the potential <br />for failure to maintain (absolutely) clean culverts. <br />Resnonse: As indicated in the introduction to Exhibit 8T, calculated design flows require <br />a maximum culvert size of 12 inches. By oversizing the culverts to 18-inch diameter (254 <br />sq. in. versus 113 sq, in. fora 12-inch culvert) we are providing 2.25x the flow capacity <br />required for peak flows. This factor of safety, when combined with our regular program of <br />culvert inspection and maintenance, is more than adequate to assure effective ongoing <br />operation of our drainage and sediment control system and regulatory compliance, even <br />when some siltation occurs. <br />Item 37. Page 2.05-45.4, line 4. The location of topsoil stockpiles need to be specified for <br />approval with regard to Rule 4.06.3, and as a plan on which to base reclamation cost <br />estimates (haul distances, etc.). The location of the topsoil pile in the vicinity of the pad is <br />shown on drawings. Topsoil storage piles are not indicated along the road. The existing <br />text of line 4 is not clear if Twentymile proposes to store topsoil removed from the roadway <br />in the pad stockpile. Please clart~and size. on the construction drawin~o~tem 32, the <br />