My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
2021-07-28_PERMIT FILE - C1981019A
DRMS
>
Day Forward
>
Permit File
>
Coal
>
C1981019
>
2021-07-28_PERMIT FILE - C1981019A
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
5/17/2022 8:32:09 PM
Creation date
10/20/2021 11:28:43 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981019A
IBM Index Class Name
Permit File
Doc Date
7/28/2021
Doc Name
East Taylor Pond & Permanent Channels
Section_Exhibit Name
Exhibit 07 Item 14 Appendix Exh7-14ET
Media Type
D
Archive
Yes
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
82
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
View images
View plain text
Appendix Exh. 7-14ET <br /> East Taylor Pond and Permanent Channels <br /> The location of the East Taylor Pond is presented on Map 12. The profiles of the <br /> associated permanent channels associated with the East Taylor Pond watershed are <br /> presented on Map 33. These channels consist of the Taylor Ditch, the East Taylor Ditch <br /> the Taylor Tributary Ditch, several terrace ditches, and their respective design <br /> information is presented in this exhibit. The as-built configuration for the East Taylor <br /> Pond is presented on Figure Exh. 7-14ET-1, and Figure Exh. 7-14ET-2 provides the <br /> breakdown of drainage areas and hydrologic conditions for this sediment pond in the post <br /> mining condition. Figure Exh. 7-14ET-3 provides as-built information on the three <br /> stockponds that are constructed in the permanent channels to help reduce peak flows and <br /> provide a water source to support the post mine land use. <br /> Exhibit 7, Item 14 in Volume 2D describes the hydrologic methodology used in sediment <br /> pond and post mine channel assumptions. Runoff curve numbers assigned to the <br /> undisturbed and reclaimed lands in various stages of reclamation have been selected in <br /> accordance with Table 1 in the Introductory Text for Exhibit 7 in Volume 2D. For <br /> channels protected by a riprap liner, selection of minimum riprap size is done using the <br /> Simons/OSM method in SEDCADTM. For channels to be protected by a vegetative liner, <br /> the permissible velocities are also determined using SEDCADTM routines. <br /> East Taylor Pond <br /> The following pages present the results of the SEDCADTM models for the hydrologic <br /> conditions under the post mining condition. At this stage the oldest reclamation is on the <br /> northern extent of the reclaimed West Pit, and the younger (topsoil and seeded) <br /> reclamation is the southern reaches of the East Taylor Pond watershed. <br /> The SEDCADTM model herein provides the results of the 10 year 24 hour design storm <br /> and demonstrates the East Taylor Pond will meet the applicable settleable solids standard <br /> under this modeled storm event. The second SEDCADTM model demonstrates that the <br /> East Taylor Pond emergency spillway elevation is capable of containing the 25 year 24 <br /> hour storm. <br /> The final post mining topographic surface and the final locations of the permanent <br /> drainage channels as presented on Map 12 were used to model the watershed for the post- <br /> mining condition. Three in-stream stock ponds (TD-1, TD-2, and ETD-1) are included in <br /> the permanent channels to decrease peak flows from the modeled storm event, and to <br /> provide a water source to support the post-mining land use. An as-built of each stock <br /> pond in the East Taylor Pond watershed are provided on Figure Exh. 7-20ET-3. <br /> Also included in the models for the East Taylor Pond is flow from the East Taylor Seep. <br /> Currently, the East Taylor Seep is routed through a french drain and ultimately to a pipe <br /> which collects the flows and discharges it into the inlet of the East Taylor Pond. <br /> Exh. 7-ET-2 Revision Date: 3/24/21 <br /> Revision No.: TR-145 <br />
The URL can be used to link to this page
Your browser does not support the video tag.