REP03080

• Permit No: M1993041
• IBM Index Class Name: Report
• Doc Name: CULTURAL RESOURCE MANAGEMENT PLAN STATUS REPORT
• Media Type: D
• Archive: No

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(9) Projection of ground vibrations from the Dowe Flats
quarry operation.
(5) Development of a monitoring program.
The Montgomery School monitoring program, if the owner
allows access, has four components:
(1) Pre-blasting structural assessment to establish
baseline building condition
(2) Consultation with Boulder County and SHPO to establish
a mitigation program that preserves the architectural
fabric and character of the building
(3) Annual monitoring program
(9) Mitigation, if necessary.
Southdown is proposing a ground vibration compliance value
0.25 inches/second for the Montgomery School. This compliance
value is based upon review of existing vibrations near the
school, analysis of the historical structure, and literature
review of acceptable standards of ground vibration for historical
structures. After approximately five years, as mining at Dowe
Flats moves from south to north, ground vibrations at the
Montgomery School will be at or below levels associated with the
existing Lyons Quarry. For the life of the mine operation, a
monitoring and conservation program is proposed to assure that
the compliance level provides adequate protection for the
Montgomery School building. Further policies for any mitigation,
should it become necessary, will be included in the CRMP.
Southdown has been working with the U. S. Army Corps of
Engineers since 1967. In keeping with the SHPO request, the Tri-
Lakes Office was consulted on June 7, 1993.
Southdown has used the NHPA 106 framework as a process model
for project review, comment and mitigation. All reports meet
federal standards. Project review, SHPO, American Indian and
Boulder County consultation and other efforts meet the 106
guidelines.
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