PERMFILE64468

• Permit No: M2005066
• IBM Index Class Name: Permit File
• Doc Date: 5/2/2006
• Doc Name: Response to Adequacy Review - 2nd
• From: Banks and Gesso LLC
• To: DMG
• Media Type: D
• Archive: No

STATE
DIVISION Of MINERALS AND GEOLOGY
Deparltnerlt of NaNraf Resources
1313 Sherman St., Raom 215
IJenver, cclorado eo2o3
Pl+one: (303) 8663567
FAX: 13031 a32A106
DATE: April 14, 2006
TO: Erica Crosby, Carl Mount
FROM: Tom Schreiner / j
COLORADO
COLORADO
DIVISION O F
MIN~RALS
GEO OGY
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RE: Hydrology Review, "Wallenberg 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 Apri15, 2006
adequacy response provided by the applicant.
6.4.3 EXHIBIT D - Minlne 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 mazk the 200 foot setback prior to excavation in this area. Please respond.
aFltt of Office of Colorado
Mined Land Reclamation Active and Irwaive Mines Geological Survey