2020-01-31_PERMIT FILE - M2020008

• Permit No: M2020008
• IBM Index Class Name: PERMIT FILE
• Doc Date: 1/31/2020
• Doc Name: Application
• From: Scott Contracting Inc.
• To: DRMS
• Email Name: LJW
• Email Name: THM
• Media Type: D
• Archive: No

Rifle Gravel Pit #1 January 2020
Table 3. Water Use Demands for Active Mining
Exposed
Amount of Water Lost Water Used Groundwater Domestic/ Total
Aggregate With Mined for Dust Evaporation Commercial Operational Water Use
Production Aggregate Control Indoor Use
Volume (AF) Avg
Rate
Month (tons) (AF) (AF) (AF) (AF) (gpm)
Jan 16,667 0.491 3.07 0.00 0.00 3.56 26.0
Feb 16,667 0.491 3.07 0.00 0.00 3.56 28.8
Mar 16,667 0.491 3.07 0.00 0.00 3.56 26.0
Apr 16,667 0.491 3.07 0.00 0.00 3.56 26.9
May 16,667 0.491 3.07 0.00 0.00 3.56 26.0
Jun 16,667 0.491 3.07 0.00 0.00 3.56 26.9
Jul 16,667 0.491 3.07 0.00 0.00 3.56 26.0
Aug 16,667 0.491 3.07 0.00 0.00 3.56 26.0
Sep 16,667 0.491 3.07 0.00 0.00 3.56 26.9
Oct 16,667 0.491 3.07 0.00 0.00 3.56 26.0
Nov 16,667 0.491 3.07 0.00 0.00 3.56 26.9
Dec 16,667 0.491 3.07 0.00 0.00 3.56 26.0
Total 200,000 5.89 36.83 0.00 0.00 42.72
Table 4. Water Use Demands for Post Mining
Gross Evaporation - Post Mining
For Finished Pond Surface Area:
Gross Unit Evaporation 53 acres
Month / Per 1 Acre(AF) Volume (AF) Average Rate (gpm)
•
Jan 0.11 -
Feb 0.13 -
Mar 0.21 10.93 79.8
Apr 0.34 17.89 134.9
May 0.45 23.85 174.1
Jun 0.54 28.82 217.4
Jul 0.56 29.81 217.6
Aug 0.51 26.83 195.8
Sep 0.38 19.88 149.9
Oct 0.26 13.91 101.5
Nov 0.15 7.95 60.0
Dec 0.11 -
Total 3.75 1 179.87
8.6 Colorado Discharge Permitting System (CDPS) Permit
SCI will have an approved CDPS permit from the CDPHE-WQCD prior to any discharge.
29