My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
2010-11-19_PERMIT FILE - C1980007 (36)
DRMS
>
Day Forward
>
Permit File
>
Coal
>
C1980007
>
2010-11-19_PERMIT FILE - C1980007 (36)
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
8/24/2016 4:27:08 PM
Creation date
3/24/2011 10:23:53 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980007
IBM Index Class Name
Permit File
Doc Date
11/19/2010
Doc Name
Surface Facilities Area and Water Tank Site
Section_Exhibit Name
Exhibit 66 SAE Lone Pine Water Tank
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.
/
150
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
A conservation practice of "Permanent Pasture, Rangeland, Idle Land, and Grazed Woodland" was selected as <br />representative of the natural site. Vegetative cover was evaluated as Appreciable Brush, 2 meters tall, 50 % Canopy <br />Cover, 60% Ground Cover. The CP value selected was 0.038. <br />For bare, unprotected soil, a CP of 0.80 (loose to 12 inches, rough) was used. <br />5. INTERCEPTOR DITCH AND POINT DISCHARGES <br />Design input parameters include the standard West Elk triangular ditch design of 2 (horizontal) to 1 (vertical) side <br />slopes. <br />During construction, the erodible fraction of the soil matrix is expected to be rapidly removed, leaving a protective <br />armor (ditch lining) of cobble sized materials in the circumvential ditches. Thus the circumvential ditch material <br />is described as "graded silts - cobbles colloidal ". The maximum allowable velocity of such a protective ditch lining <br />is 5.50 feet per second (fps). <br />6. LIMITATIONS OF THE SEDCAD+ MODEL AND <br />SUBSTITUTIONS <br />SEDCAD+ does not model silt fences or straw bales. No contribution to sediment control or mitigation of affects <br />on water quality was made in this analysis. <br />SEDCAD+ does not model forest (brush) litter as a filter. The litter was equated to a grass filter. Equivalent grass <br />filter input parameters used were: <br />• 1} a slope of 20 %. <br />2) a Mannings "n" value of 0.01 (a very dense grass). <br />3) a spacing of 0.2 inches (between grass stems). <br />4) a height of 2 inches. <br />5) a filter width of 390 feet (the lower perimeter of the pile). <br />6) an infiltration rate of 0.1. <br />7) a stiffness factor of 20. <br />8) a length of 30 feet. <br />7. SEDCAD+ ANALYSIS INFORMATION <br />The Small Area Exemption SEDCAD+ demonstration (Enclosure 3) indicates that the Peak Settleable Concentration <br />of discharges (10 -year, 24 -hour precipitation event) from the vegetative debris filter as 0.00 mill. The 100 -year, <br />24 -hour precipitation event demonstration (Enclosure 4) indicates that the Peak Discharge (flow) in Ditch DWP-W <br />is projected as 0.26 cubic feet per second (cfs), and 0.27 cfs in Ditch D"-E. <br />• (West Elk Lone Pine Gulch Development Waste Pile SAE, 12 October 1995, Page 6 of 7) <br />
The URL can be used to link to this page
Your browser does not support the video tag.