2004-09-02_REVISION - M2000158

• Permit No: M2000158
• IBM Index Class Name: Revision
• Doc Date: 9/2/2004
• Doc Name: Amendment Approval
• From: DMG
• To: Platte Sand & Gravel LLC
• Type & Sequence: AM1
• Media Type: D
• Archive: No

STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY v
Department of Natural Resources
1313 Sherman St., Room 215 C O L D RA D O
Denver, Colorado 80203 DIVISION O F
Phone: [phone] MIN 6 RA L S
FAX: [phone] G E O L O G Y
' RE<LANATION•NI NING
SAFETY•SCIENCE
September 2, 2004 /
Bill Owens
Governor
Rocky Hoffschneider Russell George
Platte Sand & Gravel LLC ~ Executive Director
P.G. BOX 1a4~ Ronald W. Canany
Littleton, CO 80160 Division Director
Natural Resourrn Trustee
J /
Re: S & H Mine, Amendment Approval, Permit No. M-2000-158, Revision No. AM-1
Deaz Mr. Hoffschneider:
On August 25, 2004 the Mined Land Reclamation Board approved the Amendment Application (AM-Ol) submitted to
the Division on May 24, 2004, addressing the following:
Approve AM-01 Application with Conditions, to line the Longhorn & Sharkey Lakes with a bentonite slurry wall
and change their postmining land use to developed water resources.
The terms of the Amendment No. I approved by the Division aze hereby incorporated into Permit No. M-2000-158.
The conditions of the Division approval are noted below. Please note that all other provisions of Pem3it No. M-2000-158
remain in full force and effect.
Stipulation No. Description
For each crossing of a utility line during slurry wall construction,'the Operator must provide
DMG notarized documents in accordance with Rule 6.4.19(a) or Rule 6.4.19(c). These
notarized documents must be accepted and approved by DMG prior to any excavations to
expose the utilities. Alternafively, the Operator may provide an engineering plan for each
proposed utility crossing for which an acceptable notarized document is not obtained. Each
crossing plan must be approved by DMG prior to any excavations to expose the utilities.
2. The Operator will implement the groundwater monitoring plan as proposed. Specifically,
Platte Sand & Gravel will install 4 monitoring wells between the river and the lined areas,
monitor the existing well in the Bluff Lake azea and monitor wells that were proposed in the
original recharge plan to determine pre and post lining water table elevations. Monitoring data
will be collected monthly until one year after the first slurry wall as been built, and quarterly
after that. Groundwater information will be correlated with the river flow by obtaining stream
flow numbers from a local gaging station. Platte Sand & Gravel will include ground water
monitoring data with its annual report to the Division. in the event there is a significant drop
(2 feet or more) in the water table caused by the slurry wall liner, a recharge ditch will be
installed along the west side of the liner and irrigation water will be diverted to it to rechazge
the azea around the trees. Termination of the groundwater-monitoring plan will require a
revision to the permit.
Office of Office of Colorado
Mined Land Reclamation Active and Inactive Mines Geoloeical Survev