PERMFILE118229

• Permit No: M2004051
• IBM Index Class Name: Permit File
• Doc Date: 10/25/2004
• Doc Name: Response to Adequacy Review Comments
• From: Applegate Group Inc.
• To: DMG
• Media Type: D
• Archive: No

Applegate ~/
~.
Group, t~~.
October 22, 2004
Division of Minerals and Geology /
Department of Natural Resources V/
Aftn: Mr. Gregg Squire
1313 Sherman Street, Room 215
Denver, Colorado 80203
REGE~!>f= ~.
OCT 15 204
Mriciou ei Mioerels and GeoluAr
RE: Response to Adequacy Review Comments, 112 Construction Materials Applicatio»,
Aggregate Industries - WCR, Inc., Wattenberg Lakes, M-2004-051 /
Dear Mr. Squire:
The following discussion and attachments are submitted on behalf of our client in response to the
adequacy review comments received for the proposed Wattenberg Lakes project. The Colorado
Division of Minerals and Geology submitted clarification comments to the applicant on
October 2l, 2004. The information and discussion below addresses each comment as it was
presented by the Division.
3. Exhibit G -Water Information
As stated previously, to evaluate dewatering and slurry wall affects, the applicant commits to
continue the monitoring of alluvial groundwater wells on-site. The wells will be monitored on a
monthly basis and results of the monitoring effort will be submitted to the Division along with
other annual reporting requirements, Collected baseline data (data collected prior to mining
below the groundwater table or installation of the slurry walls) will provide a range of relative
water levels associated with pre-mining groundwater conditions. Typically, alluvial groundwater
elevations along the South Platte River near the site tend to fluctuate between two and four feet
each year, being highest in the summer and lowest in the winter and eazly spring.
With the baseline information established, monitoring data collected during mining and
reclamation activities will be used to identify potential groundwater affects during dewatering
and installation of the slurry walls. Monitoring data collected during the mining and reclamation
activities will be evaluated and compazed to the established baseline data. If the groundwater
elevation in a .well increases or decreases by two (2) or more feet from the seasonal range, and
the measured elevation is not consistent with groundwater elevation trends at the other wells on-
site, the Division will be notified within seven (7) days.
After the Division has been notified, the applicant will review data from all the monitoring wells
and submit a report to the Division within 30 days. Changes in measured groundwater elevations
1499 West 720th Avenue, Suite 200 [phone] + Far [phone]
Denver, Colorado 80234-2759 www.applegategroup.com