PERMFILE118814

• Permit No: C1981033
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: Exhibit 25 Bear 1 & 2 Reclamation Plan
• Media Type: D
• Archive: No

RXHIBIT 25
• 'untreated dra:inage'frdm the disturbed area ceases to contribute
additional`suspended solids above natural conditions.
The disturbed area has been reyegetated and stabilized as evider~Fed
by the vegetation surveys. Perennial,. non-noxious plant species
account for 37.78 and 35.7$ absolute cover based on the 1991 and
1992 vegetation surveys respectively. This compares with a cover
standard of 368 (908 X 408). The covei standard for this area was
set by the Division. Based on, the fact that an agreed upon cover
standard has tieen'achieved, it can be assumed that the ground cover
of living plants on the disturbed area, (368 +/-) is adequate to
control erosion.
Run-off from the mine site (if any).flows into the North Fork of
the Gunnison River approximately one mile upstream of the town of
Somerset, Colorado. The drainage area of the North Fork of the
Gunnison River ehcompasses 526 square miles near Somerset according
to the local USGS office. The areal extent of .the reclaimed area
at the mine sites is'4.5 acres. Therefore the reclaimed mine sites
only contribute about 0.00138 of the drainage area of the river.
Run-off from the mine site should not have a measurable effect .on
'_l~e downstream receiving stream standards for the following
reasons:
1) The sediment pond has not discharged nor has it had a
significant amount of water in it since the mine was
reclaimed. This .indicates that the mine site may seldom
if ever contribute overland surface flow to the
downstream receiving waters.
2'); The reclaimed mine site only contributes 0.00138 of the
total North Fork of the Gunnison River drainage area.
Therefore, the potential volume of surface run-off from
the mine site is insignificant compared to the volume of
run-off generated from the entire North Fork of the
Gunnison River drainage.
3) The calculations presented on the following pages B
through 10 demonstrate that both the No. 1 and No. 2
Mines have ceased to contribute suspended solids above
natural conditions as required by Rule 4.05.2(2).
Based on the above rationale, the sediment pond (No. 003)
associated with t'he Bear No. 1 and No. 2.mines is no longer.
required. The disturbed area has been revegetatad and stabilized
and run-off from the mine site should not base a,~ea¢urdb~e,~f~Qot
on the downstream reeeiw'ing stream stan~Fasds. Map 452 presents
the reclamation plan for the Sediment Pond No. 003. The sediment
,~ pond will be regraded and revegetated during 1993.
7