PERMFILE54055

• Permit No: M2001016
• IBM Index Class Name: Permit File
• Doc Date: 4/17/2001
• Doc Name: FREDSTROM RESOURCE REGULAR 112 ADEQUACY REVIEW FN M-2001-016
• From: DMG
• To: AGGREGATE INDUSTRIES INC
• Section_Exhibit Name: EXHIBIT D MINING PLAN
• Media Type: D
• Archive: No

•

STATE OF COLOR.P~DO
DIVISION OF MINERALS AND GEOLOGY
Department of Natural Resources
1313 Sherman St., Room 215
Dem~er, Colorado 80203
Phone ~. 13031 866-3 S 6:
fAX: [phone]:-8106
April 17, 2001
Norm Roche
Aggregate Industries, Inc.
3605 South Teller Street
Lakewood, CO 80235
RE: Fredstrom Resource, Regular 112 Adequacy Review, File No. M-2001-016
Dear Mr.:
DIVISION OF
MINERALS
GEOLOGY
RECLAMATION
MINING•SAFETY
Bill Owens
Governor
Greg E. VJalcher
Executive Dhecmr
Michael B. Long
Division Director
Listed below are adequacy review comments on the above-captioned Regular 112 Application.
The decision date for your application is scheduled for June l 1, 2001. Therefore, I would
appreciate a response from you on or before May 18, 2001. Any public comments that we
receive on your application during the interim will be forwarded to you. Please be advised that
your application may be deemed inadequate and may be denied on June 11, 2001 unless the
following adequacy review items are addressed to the satisfaction of the Division.
6.4.4 EXHIBIT D - Minine Plan
1. The mine plan map shows that all of Areas 1 & 2 and part of Area 6 occur within the 100-year
floodplain of St. Vrain Creek. In conformance with Rule 6.4.4(c), the Division requests that the
applicant assess what level of flood protection is provided by the existing contours at the
Fredstrom Property, ie: would the site be inundated during a 2-yeaz, 5-year, 10-year, 25-year, 50-
year flood event in St. Vrain Creek. What is the peak flow velocity expected during such a
flooding event and what specific mitigation measures will the applicant employ to maintain the
stability of disturbed (pit) slopes and on-site structures such as conveyor supports during such a
peak flow velocity? Will the applicant install any flood control structures prior to or during
mining or reclamation to protect mined reclaimed areas and to help dissipate flood waters in a
controlled manner? Please address.
2. The applicant states on page 23 that the mining plan includes a tree preservation plan and
preservation area to ensure quality habitat is protected including the cottonwood grove and
wetland-filled meander scars north of the creek. The applicant also states on page 15 that
Aggregate will preserve the majority of the existing riparian area and monitor the condition of
the trees to be preserved. If they appeared stressed by dewatering activity, supplemental
irrigation water or groundwater pumped from the pits will be applied. The Divisions appreciates