2007-10-31_REVISION - M2006080 ‎(2)‎

• Permit No: M2006080
• IBM Index Class Name: Revision
• Doc Date: 10/31/2007
• Doc Name: Submittal
• From: WSI
• To: DRMS
• Type & Sequence: TR1
• Media Type: D
• Archive: No

ENGINEERING SOLUTIONS FROM THE GROUND DOWN
September 28, 2007
File No. 107021-000
Compass Environmental, Inc.
9741 Preston Road
Suite 205
Frisco, TX 75034
Attention: Mr. Jeff Sallas
Subject: Design Report
Soil-Bentonite Cutoff Wall for
Loveland Ready Mix
Bokehvar>/Waiters Pit
Fort Lupton, Colorado
Dear Jeff:
Lyman Henn is pleased to present this design report for the subject project. This report was conducted in
accordance with our proposal dated February 27, 2007 and our amendments dated June 5, 2007 and July 3,
2007.
This report summarizes the subsurface explorations and conditions encountered along the slurry wall alignment,
and provides specifications for the key design elements of the slurry wall, clay borrow, slurry wall protection,
and site reclamation. Our scope of work did not include additional engineering services which may be required
to use the lined gravel pit at a water storage reservoir. Some of these additional engineering services include:
• Preparing an Office of the State Engineer Dam Construction Permit (If the proposed reservoir will store
water above the natural ground surface),
• Preparing the design for reservoir hydraulic facilities (Inlet and Outlet structures).
• Perfomring the Initial Liner Test required by the State of Colorado for designating a lined gavel pit.
• Petfomung monthly or weekly physical water accounting to demonstrate that the lined pit continues to meet
the seepage standazd and report this information to the Water Commissioner as directed by the State
Engineer.
• Performing an evaluation of the proposed mine reclamation slopes to determine if they can function as
permanent reservoir sideslopes, particularly during rapid drawdown reservoir operations.
• Providing a topographic survey of the final reservoir configuration and use this survey to provide astage-
storage curve for as-constructed reservoir capacity.
• Performing an evaluation of groundwater impacts (mounding or shadowing) caused by the slurry wall.
110 16`" Street, Suite 900 -Denver, CO 80202-5202 -Tel: [phone] -Fax: [phone] - www.lymanhenn.com
Geotechnical, Tunneling and Construction Services