My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
REV89689
DRMS
>
Back File Migration
>
Revision
>
REV89689
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
8/25/2016 3:11:34 AM
Creation date
11/21/2007 10:54:21 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1984065
IBM Index Class Name
Revision
Doc Date
12/12/1994
Doc Name
PERMANENT DIVERSION DITCHES NCIG COAL RIDGE 1 ALL CHANNELS AR 2% SLOPE
Type & Sequence
TR10
Media Type
D
Archive
No
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
53
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
• -15- • <br />layer should be placed immediately beneath the slabs. The gravel <br />should have a maximum -200 sieve content of 10~, at least 50~ <br />retained on the No. 4 sieve and a maximum size of 2 inches. <br />SEDIF1EttTATION FOND <br />The proposed sedimentation pond will be constructed mainly by <br />cutting below the natural ground surface and Filling on the down- <br />hill side. Cut and fill slopes are proposed to be 2 horizontal <br />to 1 vertical. Percolation tests were performed in the proposed <br />sedimentation pond area and laboratory permeability tests were <br />performed to help assess seepage loss front the pond area. The <br />percolation rates obtained under relatively low head indicate <br />seepage loss could be substantial. The laboratory tests indicate <br />isolated clay layers could be relatively impervious. <br />Based on the test results, it appears that lining should be <br />provided to reduce the seepage loss. We expect that the on-site <br />clays can be used as a liner provided some seepage loss is <br />acceptable. A minimum two-foot thick clay liner should be <br />used. The clay material should have at least 60p passing the No. <br />200 sieve and a minimum liquid '_imit of 30. Bentonite may be <br />added to further reduce the liner permeability. The fill portion <br />of the pond embankment should consist of predominant clay like <br />the soil liner. Embankment and ]finer materials should be <br />compacted to at least 95~ of stan~!ar•d Proctor density (ASTM D698) <br />at a moisture content near optimum. <br />Chen & Associates <br />
The URL can be used to link to this page
Your browser does not support the video tag.