2004-05-24_REVISION - M1977347

• Permit No: M1977347
• IBM Index Class Name: Revision
• Doc Date: 5/24/2004
• Doc Name: Reply to your Letter dated May 12 2004
• From: Holcim
• To: DMG
• Type & Sequence: AM1
• Media Type: D
• Archive: No

DIVISION OF MINERALS AND GEOLOGY
Depanmenl of Nalwal Resources
1311 Sherman 51., Room 215
Denver, Cobrado 80703
Phone:[phone]
f A%•. (3031 832.8106
STATE OF COLORADO
I~~~
DEPARTMENT OF
NATURAL
RESOURCE
DATES llereh 28, 1996 Rnr Rome.
Govermr
TOS a6ry CYrt166 Ken Salun
E.ecoave Dnecwr
FRONS Allen SYreneca Mirluel 9. LOnK
Drvisron Director
RES Geotecbnical Engineering Report, Holaam, Inc., Slab Cenyoa Quarry, File
No. N-77-347
The conclusion is drawn in the GcoCae::nical Eng il;eering Rcpc%rt submitted in aupporL of
the Slab Canyon Quarry amendment applicatLon, that the proposed load-out benches will
be stable. This conclusion is contingent upon compliance with the earthwork
recommendations included In the report. In accordance with those recoimnendationa, the
applicant should specifically commit to:
1. Place and compact load-out bench fill in horizontal lifts not to exceed 2 feet
to loose thickness.
2. Complete density testing of sufficient frequency to demonstrate that load-out
bench fill is compacted to minimum 85 percent of StandaFd Proctor Density.
3. Complete gradation testing and material classification in sufficient frequency
to demonstrate that load-out bench fill does not vary epprec:iably from the
samples tested for material strength properties.
4. Exercise sufficient control over placement of load-out bench fill to assure that
the fill dose not contain organic, plastic (clays, topsoil, etc.), frozen, or
other deleterious materials.
5. Provide adequate drainage to direct surface water around the out=slope of the
toad-out benches.
I have not provided a required frequency for density or gradation test inq, or materials
classification, because these need to be Bite specific determinations. For example,
if the operator can show that a specific compaction methodology (e.cl• x number of
passes with a loaded haul truck, or track walking with a certain size dozer) results
in the required minimum density, and if the fill ie coneietent in material properties,
the frequency of density testing could be low. If the fill ie not coneietent, a much
higher frequency of testing and classification would be indicated.
The operator should provide ae-built draw inge end narrative, in terms o1' the foregoing
list of items, in the annual reports for the Slab Canyon Quarry. These annual report
inclusions would be required during each year that load-out benches are constructed.
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