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kI- <br />Mr. Brock Bowles <br />March 4, 2015 <br />Page 2 <br />the currently approved layout. If WFC wishes to change the PMT of this area, please submit the <br />changes for review in another technical revision. <br />Response: Map 2.05.3(3) -1 -2 has been updated with the approved post - mining topography as <br />requested. <br />3. Based on the proposed page 2.05.3(3) -1 -85 and approved pages 2.05.3(3) -1 -87 and 88, <br />WFC is proposing to utilize straw wattles to maintain compliance with Rules 4.05.2 and <br />4.05.5. In order for the Division to determine if the use of straw wattles will be in <br />compliance as appropriate sediment control measures, additional information must be <br />provided. The approved and proposed information presented on the referenced pages <br />does not state the size of the wattles to be used to control sediment and runoff from the <br />Morgan property. In addition, the specifications and properties regarding the straw <br />wattles ability to control soil loss based on a 10 year -24 hour storm event was not <br />included. Please provide a sedimentology demonstration that represents the amount of <br />soil loss predicted from the disturbance area. Please also provide testing specifications <br />and properties to include; size, minimum sediment yield value, and installed freeboard <br />height for the straw wattles to be used to prevent soil loss based on the model to include <br />size of wattles. <br />Response: Additional information has been provided in Attachment 2.05.3(3) -1 on pages 86 -89 <br />which indicates the size of the straw wattles to be used to control sediment and runoff from the <br />Morgan property and includes material characteristics, installations guidelines, and design values. <br />The additional information provided includes but is not limited to, size of straw wattle to be used, <br />installed freeboard height, P- Factor based on large scale simulated rainfall testing, and percent <br />soil retained. <br />2.05.4 — Backfill and Grading <br />1. The revised Map 2.05.4 -4 Postmining Topsoil Replacement has different post- mining topography <br />on the WFC (Johnson) and WFC (Lloyd) properties than the currently approved map. So that we <br />may expedite the approval of TR65, please change the topography in this area back to the <br />currently approved layout. If WFC wishes to change the PMT of this area, please submit the <br />changes for review in another technical revision. <br />Response: Map 2.05.4 -4 has been updated with the approved post- mining topography as <br />requested. <br />2. The revised Map 2.05.4 -5 Postmining Vegetation /Land Use Map has different post- mining <br />topography on the WFC (Johnson) and WFC (Lloyd) properties than the currently approved map. <br />So that we may expedite the approval of TR65, please change the topography in this area back to <br />the currently approved layout. If WFC wishes to change the PMT of this area, please submit the <br />changes for review in another technical revision. <br />AN EQUAL OPPORTUNITY / AFFIRMATIVE ACTION EMPLOYER <br />A Touchstone Energy'C.00perative t <br />