PERMFILE49262

• Permit No: M2005066
• IBM Index Class Name: Permit File
• Doc Date: 4/14/2006
• Doc Name: Hydrology Review
• From: DMG tas
• To: DMG
• Media Type: D
• Archive: No

STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY
Department of Natural Resources
1313 Sherman St., Room 215
Denver, Colorado 80203
Phone: (303) 86fr3567
FAX: [phone]
DATE: Apri] 14, 2006
COLORADO
DIVISION O F
MINERALS
GEOLOGY
RECLANATION•NINING
SAfETT•aOENCF
Bill Owens
Governor
TO: Erica Crosby, Carl Mount Russell George
Executive Director
FROM: Tom Schreiner Ronald W. Caltany
Division Director
Natural Resourre Trustee
RE: Hydrology Review, "Wattenberg West Sand & Gravel Mine'; Asphalt Paving Company
File M-2005-066, Class: Permit
This memo contains remaining adequacy review comments from the Division's Hydrology
Review of the "Wattenberg West Sand & Gravel Mine" Regular 112 Application for 135
permitted acres and reclamation to developed water resources, File No. M-2005-066. These
comments area based on review of the original permit application as well as April 5, 2006
adequacy response provided by the applicant.
6.4.3 EXHIBIT D - Minine Plan
2. The Applicant projects a discharge rate of 2.5 to 10 cfs for process water discharged offsite to
either the Brighton Ditch or a water conveyance easement flowing towards the South Platte
River. Prior to approval, the applicant will need to specify the design flow capacity of either the
Brighton Ditch or water conveyance easement and verify that either structure has the capacity to
receive the anticipated de-watering flows of up to 10 cfs. Also, the applicant will need to locate
on a Mine Plan Map where the point of discharge will be, provide a schematic showing how the
mine water will be discharged into either structure, and provide sufficient detail to demonstrate
that discharge of mine water offsite will not result in excessive erosion or offsite damage. (The
Division recommends that the applicant include representative cross sectional designs of the
Brighton Ditch or water easement structure to clarify their design flow capacity and capability to
receive mine de-watering flows). Please respond.
6.4.7 EXHIBIT G -Water Information
6. In accordance with Rule 3.1.6(1}, the applicant will need to affirmatively state that the planned
de-watering activities will not result in a negative impact on the normal operation of the Brighton
Ditch. Also, the applicant shows on Exhibit C-3, Mine Plan that the Phase 1 excavation will be
two hundred (200) feet away from the Brighton Ditch. The Division recommends that the
applicant locate and mark the 200 foot setback prior to excavation in this area. Please respond.
Office of Office of Colorado
Mined Land Reclamation Active and Inactive Mines Geological Survey