2015-09-17_PERMIT FILE - C1984065 ‎(3)‎

• Permit No: C1984065
• IBM Index Class Name: Permit File
• Doc Date: 9/17/2015
• Section_Exhibit Name: 4.0 Exhibit and Figures
• Media Type: D
• Archive: No

June 17, 1991
WATE R
WASTE
6z LAND
INC.
Adrian Brown Consultants, Inc.
155 South Madison Street, Suite 302
Denver, Colorado 80209
2629 Redwing Rd. Suire 200, Fort Collins, Colorado 80526
[phone]
fax [phone]
D C~C~~~~J~,~
JlM i 81991 ~~ ~
V
WWL Ii063
Attention: Mike Galloway, Hydrogeologist
Subject: New Castle Energy Corporation, Temporary Mining Refuse Storage Area
Dear Mike,
As you requested on June 10, this letter summarizes WWL's design of the mine
refuse storage facility for New Castle Energy Corporation's Coal Ridge No. 1 Mine
in Garfield County, Colorado. This design has been prepared to meet the
requirements of Permit Stipulation No. 20. A figure illustrating this design
is attached with this Tetter.
•
~ SUMMARY OF AVAILABLE INFORMATION
Th1s design is based on permit conditions and site information in the revised
permit application to the Colorado Mined Land Reclamation Division. The revised
permit application cover letter was dated March 9, 1990, with sections dated
August 6, 1990 and May 9, 1991.
As documented in the revised permit application, waste rock from the underground
mining operations will be disposed of back in the mine at the close of
operations. A minor amount of the waste rock will be blended into the coal
product stream to maintain desired levels of ash content. During mine operation,
the waste rock (or refuse) will be temporarily stored on the surface. This
temporary facility is referred to in the permit documentation as the mining
refuse storage facility.
Design criteria for the refuse storage facility are sunmarized below (from the
permit documentation).
a. Maximum capacity for 15,000 cubic yards of refuse, consisting of broken
and pulverized sandstone and shale. This material is anticipated to be
• ~ free draining.
Consulting Engineers ;u td Scientists