INSPEC28371

• Permit No: C1980004
• IBM Index Class Name: Inspection
• Doc Name: ENVIRONMENTAL ASSESSMENT ON THE MCCLANE CANYON MINE
• Media Type: D
• Archive: No

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acreage amounts to less than two-tenths of a percent of the area contained
within the ltunger Canyon Drainage (5,085 acres), and one one-hundreth of a
percent of the total drainage area of East Salt Creek above the confluence
with :Sunger Canyon (67,228 acres). Both ltunger and McClane Canyons (42.7
acres) will only affect six-hundreths of a percent of the drainage area of
East Salt Creek.
As-indicated-cumulative-impact-ocr=flow-in'East -Salt-Creek as a result of the
operations at McClane and ltunger Canyons will be relatively insignificant.
All flows occurring outside of the disturbances will be routed around [hem and
returned to the drainage. Runoff produced from the disturbed areas will be
contained in sedimentation ponds for a sufficient enough time to meet NPDES
and !tined Land Reclamation effluent standards, and will then be released into
the drainage.
For the same reasons water quality in East Salt Creek will be minimally af-
fected. Because the surface disturbance will consist primarily of road and
portal development most of the impact will consist of an Sncrease_in suspended '
sediment concentrations: -The .sedimentation .ponds are designed.to reduce the
sediment concentration to acceptable levels before release into the streams.
The ltunger Canyon operation will mine~the same coal zone as the~McClane Canyon
-- - - - -
-- -----=~ine:='Fo~the~irst=permit-term the=Munger~peration_when reopen~d_aill_not_ __
advance into the zone of saturation that is projected by the applicant on
i~ drilling information. Neither mine is expected to have a significant impact
'~- on ground~wate~r during the first permit term. There will~be no cumulative of -
fect on any aquifers of regional extent as a result of mining at these loca- -„ '
- tion. -
The projected development of the _McClane, Canyon and Munger Canyon Mine work-
ings Sndicates~fur[her impact on ground aod.suiface water in the future. .Mun-
ger Creek, Buniger Canyon, Stove Canyon and a portion of the East Salt Creek
- valley floor will be undermined. Prior to issuance of a permit to mine Into .
these areas St will be necessary to determine the absence or presence of AV F's
in these canyons, and, to predict_the,effect of_mining.on,any AVF's identi-_.
fled. These determinations will occur in future permit applications. '
Mining will progress into the projected saturated zone of the coal seam in
future permit terms. The recharge area of the Cameo seam at East Salt Creek
will also be impacted. In subsequent permits, geologic and alluvial monitor-
ing sites will have to be established to adequately monitor the effects of
mining on geologic and alluvial ground water quantity and quality.
After mining is completed, all portals will be sealed and disturbances will be
backfilled, graded, tops oiled and revegetated. In this reclaimed situation
the hydrologic characteristics of the disturbed areas will be restored [o
nearly pre--nlning conditions.
The assessment of the probable cumulative impacts of all anticipated coal min-
e ing in the general area on the hydrologic balance has been made by C:~iL4D, and
OS`t and the operations proposed under the application have been designed to
prevent da:~age to the hydrologic balance outside the proposed permit area,