2016-10-20_PERMIT FILE - M2016054

• Permit No: M2016054
• IBM Index Class Name: PERMIT FILE
• Doc Date: 10/20/2016
• Doc Name: Response To Reclamation Permit Application Consideration
• From: DWR
• To: DRMS
• Email Name: MAC
• Media Type: D
• Archive: No

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! COLORADO
Division of Water Resources
Departrriezt of Natural Resources
1313 Sherman Street, Room 821
Denver, CO 80203
Responses to Reclamation Permit Application Consideration
DATE: October 19, 2016
TO: Michael A. Cunningham, P.E., Environmental Protection Specialist
CC: Division 1 Office, District 5 Water Commissioner
FROM: Sarah Brucker, P.E.0 RECEIVED
RE: Irwin/Thomas Mine, File No. M-2016-054 Gi tACT 2 0 2016
Applicant/Operator: Aggregate Industries - WCR, Inc.
Contact: Connie Davis, [phone] DIVISION OF RECLAMATION
Section 11, Twp 2 North, Rng 69 West, 6th P.M., Boulder County MINING AND SAFETY
CONDITIONS FOR APPROVAL
® The proposed operation will consume ground water by: ® evaporation, ® dust control,
® reclamation, ® water removed in the mined product, ❑ processing, ❑ other:
Prior to initiation of these uses of ground water, the applicant will need to obtain either a gravel pit or
other type of well permit, as applicable. However, prior to obtaining a permit, an approved water
supply plan or decreed plan for augmentation is required.
® Prior to approving a well permit, the applicant must conduct a field inspection of the site and
document the locations of all wells within 600 feet of the permit area. The applicant must then obtain
a waiver of objection from all well owners with wells within 600 feet of the permit area or request a
hearing before the State Engineer.
® Any storm water runoff intercepted by this operation that is not diverted or captured in priority must
infiltrate into the ground or be released to the stream system within 72 hours. Otherwise, the
operator will be required to make replacements for evaporation.
COMMENTS: The subject application is for a surface mining operation on 295.8 permitted acres located near
Longmont, Colorado. The primary commodities to be mined at the site are sand and gravel. The site is
proposed to be reclaimed to its current use of general agriculture upon completion of this mining operation.
Sand and gravel deposits are anticipated to be mined to a depth of 20 to 25 feet below ground surface. Ground
water is expected to be encountered at a depth of less than 5 feet below ground surface. The site is proposed
to be dry mined using dewatering trenches and pumps. The collected ground water will be discharged to St.
Vrain Creek. Prior to the use/exposure of any ground water at the site the applicant must first obtain a well
permit and a valid substitute water supply plan or decreed plan for augmentation. (An application for a
substitute water supply plan has been submitted to this office; however, the lease for the replacement water
source expires on December 31, 2016.)
The final reclamation plan includes the creation of wetlands and ponds. Any ponds that expose ground water
to the atmosphere and any wetlands in excess of what existed prior to commencement of mining operations
will need to be included in a substitute water supply plan approved pursuant to 5 37-92-308(4), C.R.S., or a
decreed plan for augmentation prior to our office considering reclamation having been completed.
The applicant may contact the State Engineer's Office with any questions.
1313 Sherman Street, Room 821, Denver, CO 80203 P 303.866.3581 www.water.state.co.us I ,