2014-01-13_REVISION - M1990098

• Permit No: M1990098
• IBM Index Class Name: REVISION
• Doc Date: 1/13/2014
• Doc Name: Agreement for compensation for damage to structures within 200 feet of mining activities SO01
• From: Northern Colorado Constructors, Inc.
• To: Weld County Planning and Building Department
• Type & Sequence: SO1
• Email Name: PSH
• Media Type: D
• Archive: No

APR 14 2014
DIVISION OF RECLAMATION
MIIdIIIIVIG AND S„FFTY
January 8, 2014
Weld County
Planning and Building Department
Attn: Tom Parko
1555 N 17th Ave
Greeley, CO 80831
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MW ff
Evre" a"
9075 WCR 10 * Fort Lupton, CO 80621
PHONE: 303 - 857 -1754
S U r I
FAX: [phone]
www.ncconstructors.com
RECt-Iy
.ED
JAN 20]4
Weld GR ELI - -.r1ng Department
EY OFFICE
Re: Agreement for Compensation for Damage to Structures within 200 feet of
mining activities
To Whom It May Concern:
Northern Colorado Constructors, Inc. has a State of Colorado Division of
Reclamation, Mining, and Safety (DRMS) Reclamation Permit M1990 -098 to allow
sand and gravel mining on property within 200 feet of structures located on your
property. The Colorado Mined Land Reclamation Act provides protection for your
property, and specific protection for your structures located within 200 feet of the
mining activities.
DRMS Permit requires a notarized agreement between the permit holder and owners
of structures within 200 feet, providing compensation for any damage to the structure;
or preparation of an engineering evaluation acceptable to the DRMS, demonstrating
that such structures shall not be damaged by the mining activities if an agreement
cannot be reached.
Northern Colorado Constructors, Inc. has hao an engineering evaluation performed
to determine acceptable setbacks from their proposed mining permit boundary and
mining limit to structures adjacent to the mining. The proposed mining slopes and
setbacks were analyzed using the XSTABL v5.105a computer program. XSTABL
was designed to analyze the slope stability of earth embankments subjected to
several critical situations that may occur during the life of the embankment. The
procedure searches for circular shear failures and automatically searches for the
lowest safety factor. 2,000 separate failure surfaces were analyzed for each case.
The required minimum safety factors are based on the current standards used by the
Colorado State Engineer's Office (SEO) for high hazard embankment dams, and
industry accepted standards for the evaluation of embankments during construction.
The safety factors attained using the setbacks shown on the attached Mining Plan
are greater than the required safety factors specified by the SEO for an earth
embankment during construction, and an earth embankment subjected to
earthquake loading, based on the United States Geological Survey earthquake peak
2014 -0317