APPCOR12591

• Permit No: C1980007
• IBM Index Class Name: Application Correspondence
• Doc Name: UNSUITABILITY ANALYSIS AND REPORT
• Media Type: D
• Archive: No

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sealed to prevent mine inflows upon completion of mining. These plans
shall be submitted to [he regulatory authority prior to issuing the next
5-year permit.
817.21 Topsoil Protection
8. ARCO will submit, to the regulatory authority, prior to any topsoil
removal, information from a soil monitoring program (conducted prior to
topsoil stripping) if the monitoring program demonstrates that less than
18 inches of suitable topsoil is available for revegetation. Information
from the monitoring plan will be used by the applicant and the regulatory
authority to establish an approved soil handling plan.
9. Until such time that ARCO can demonstrate to the regulatory authority the
following, 1) non-combustibility of the waste rock material, 2) stability
of waste rock stockpile, and 3) non-toxicity of waste rock material to
surface and ground water and vegetation, a 4-foot cover of non-toxic
material will be required for the waste rock stockpile.
817.41 Hydrologic Balance: General Requirements
10. ARCO Coal Company or any succeeding operator of the Mt. Gunnison No. 1
t11ne must submit to the CtSLRD an annual hydrologic report. This report
shall include an analysis of all hydrologic data gathered durinv, the
year, an assessment of the impacts of mining during the year, and an
estimate of the projected impacts of mining in the following year. This
report shall assess the impacts of mining on the quality and quantity of
water in surface streams, springs, ground water aquifers, mine inflow and
mine discharges.
11. The applicant shall conduct new pumping tests on wells completed in the
Barren Member and F seam. The applicant shall use the data from these
tests to compute new estimates of the cone of influence produced by
mining, the quantity of mine water which may be depleted by mining. A
report containing the data and the results from the above tests and
calculations shall be submitted [o the regulatory authority as inclusions
to the permit application within 6 months of the permit issuing.
12. The applicant shall install the two proposed monitoring wells below the
initial waste rock pile prior to its construction. The applicant shall
submit to the regulatory authority well completion reports and
ground-water level quality data prior to placing waste rock in the pile.
13. The applicant shall submit to the regulatory authority an annual report
of inflows, discharges, and consumption of water within the mine. This
report is to include a mine workings map showing the location and
quantity of inflows; a table keyed to tine mine map which shall contain
the source. (i.e., fault, fractures, etc.), quantity, duration, and
quality (i.e., pH, electro-conductivity and temperature) of all inflows;
a table containing records of water discharged from the mine, consumed in
the mine, and imported for use within the mine; a discussion of the water
balance within the mine; and finally a projection of hydrologic impacts
of mining in the upcoming year.