My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
PERMFILE138205
DRMS
>
Back File Migration
>
Permit File
>
400000
>
PERMFILE138205
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
8/24/2016 10:38:49 PM
Creation date
11/26/2007 7:15:12 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1982057A
IBM Index Class Name
Permit File
Doc Date
5/1/2003
Doc Name
Sediment Pond SEDCAD Results
Section_Exhibit Name
Tab 13 Attachment 13-5B Appendix 1
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.
/
154
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
Pure 1999 Senora Cml C.'mymry "//.W South Mcr Sein>•oYaGne /'ar1015 StaGi/i~ry A>talysis I1 <br />SENECA COAL COMPANY <br />• SEDIMENTATION POND 015 STABILITY ANALYSIS <br />1.0 INTRODUCTION <br />1.1 PURPOSE <br />The purpose of this calculation brief is to estimate the static factor of safety (FOS) for Sedimentation <br />Pond 015 using available soil data obtained from the Soil Conservation Service (SCS) and the <br />proposed pond 015 configuration. <br />1.2 METHODOLOGY <br />The static FOS for the sedimentation pond was estimated using a basic, one-dimensional equilibrium <br />analysis program called XSTABL (v5.2). The FOS determined is the ratio of resulting resisting forces <br />to driving forces. Resisting forces are the internal strength parameters of the soil materials used in the <br />construction of the embankment and the underlying base materials upon which the facility will be <br />constructed. Driving forces aze produced by the weight of the embankment and bedding materials as <br />well as the water volume impounded in the pond. For this analysis, a circul:v failure mode was <br />assumed. The FOS was calculaced using the Bishop method. <br />1.3 PROCEDURE <br />The analysis was conduced using the proposed design con&guration for Sediment Pond 015 as <br />shown on Exhibit 13-8, Proposed Sedimentation Pond 015, of the Seneca II-W permit document <br />(Leidich, 1999). The section used for the analysis is also shown in Exhibit 13-8. For the analysis, it <br />was assumed that the water surface behind the embankment was at an elevation equal to 7,380 feet <br />above mean sea level (msl). This water surface elevation is based on the invert of rite principal <br />spillway. <br />The embankment is designed to be constructed with upstream and downstream slopes not steeper <br />than 3H:1 V. The crest of the embankment is to be constnrcted with a width equal to 15 feet. The <br />upstream height (measured from top of embankment to upstream toe) is approximately 12 feet, with <br />an additional 3 vertical feet of incised excavation. The downstream height (measured from top of ~ <br />embankment to downstream toe) is approximately 15 feet. The base of the embankment gradually <br />slopes from the upstream embankment toe to the downstream embankment toe. <br />A phreatic surface was generated based on the permanent water surface elevation of 7,380 ft-msl / <br />equivalent to the invert of the principal spillway. The phreatic surface was estimated based on Dazcy's <br />law and Casagrande's procedure outlined by Huang (1983). The resulting surface is shown on the <br />XSTABL computer printouts. <br />The SCS Soil Survey defines the soils in the immediate azea of Sedimentation Pond 015, as Coutis fine <br />sandy loam. A complete soil desorption of this soil type can be found in Appendix A, Soil Data. <br />Properties for this soil type are shown on Table 1, Sedimentation Pond 15 Soil Data. <br />• <br />Morugn~rrv Watvvt /nc ]65 South Urrin Bouleuad Suite 410 * Lakeuru~ Cdor.xlo 80228 ' (303f 763 5140 <br />ws+rrgmyod~LuW.y <br />qi//IN9M <br />
The URL can be used to link to this page
Your browser does not support the video tag.