2006-11-22_REVISION - M1995035

• Permit No: M1995035
• IBM Index Class Name: Revision
• Doc Date: 11/22/2006
• Doc Name: Response to Comments
• From: Applegate Group, Inc.
• To: DRMS
• Type & Sequence: TR1
• Media Type: D
• Archive: No

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Applegate
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November 20, 2006
Colorado Department of Natural Resources
Division of Reclamation, Mining, and Safety
Attn: Ms. Erica Crosby
1313 Sherman Street; Room 215
Denver CO, 80203
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RE: Technical Revision for Connell Resources, Inc. Wellington Downs Pit;
Permit No. M 1"395-035; Response to Comments 1~~
Deaz Ms. Crosby:
On behalf of our client, Connell Resources, Inc. (CRI), please accept the following information
in response to technical revision (TR-O1) comments for reclamation permit M-1995-035,
Wellington Downs Pit. Comments were received from the Division in a letter dated
November 6, 2006.
1. Storm water flows from the Lafarge West Weitzel Pit site (M-1986-05.0) and the
Wellington Downs Pit site have been routed from the.Weitzel Pit site along the east and
south sides of the Wellington Downs reservoir. The drainage ditch delivers flow to the
southern end of the Wellington Downs site where a culvert crosses under Larimer County
Road 36. The storm water routing from the Weitzel Pit site and through the Wellington
Downs site has been designed to pass flows from a localized 100-year precipitation event.
The concrete culvert under Larimer County Road 36 is apre-existing structure that was
likely installed to -carry historic drainage from the Weitzel and Wellington Downs
properties under the county road (see attached map). The county road and culvert aze not
within the Wellington Downs permit boundary and it is not known if the culvert was
originally sized to accommodate specific flows or storm events from the properties.
However, relative to historic flows reaching the county road and culvert, it is not likely
that mining and reclamation activities on the Weitzel and Wellington Downs properties
have increased the potential maximum flow to the culvert. The creation of groundwater
lakes and abelow-grade reservoir on the properties intercept the majority of the historic
storm water drainage from the properties and have most likely reduced the potential
maximum flow to the culvert.
2. The drainage ditch east of the Wellington Downs reservoir is in the same location as a
pre-existing ditch. The pre-existing ditch was; and the current ditch is, within the
Wellington Downs permit boundary.
1499 West 120th Avenue, Suite 200 [phone] • Fax [phone]
Denver, Colorado 80234-2759 www.applegategroup.com