PERMFILE136916

• Permit No: C1981034
• IBM Index Class Name: Permit File
• Doc Date: 7/1/1998
• Doc Name: pg 34 to 77
• Section_Exhibit Name: SECTION 2.04 Environmental Resources
• Media Type: D
• Archive: No

Y
2.04.7 (1) (a)
the coal will only influence groundwater in the alluvial aquifer
.within a distance of 200 to 400 feet of the subcrops as shown an the
Isopach Map-Alluvial Aquifer, 2.04.5-3.
Due to the very high storage capacity of the thick alluvial
glacial aquifer, the small amount of induced recharge created
by mining coal will not detrimentally affect total capacity of
this aquifer system. In the extreme case of the "E" coal seam,
where the subcrop exists for a distance of approximately 4000
lineal feet beneath the alluvial material, the total amount of
induced recharge would be on the order of 100 to 1000 gallons per
minute for the entire length of the subcrop. The coal will remain
in place for a distance of 200 to 900 feet from the face of the subcrop, thus
the effect of induced recharge will be minimized. Since the subcrop
distance of the "D" coal seam is much shorter than for the "E"
opal seam, its effect on the alluvial aquifer will be substantially less. The
subcrop will not be mined in either the "D" or the "E" eoal seams.
The effects of any induced recharge into the coal seams, and subsequent
.dewatering of the alluvial aquifer, should not seriously affect those
wells in the area deriving their water from the alluvial aquifer.
i
The wells north and northeast of the mine permit area are up gradient,
close to recharge sources and are of sufficent depth to adequately
protect them from the influences of mining. Onlv one well deriving ~I
its water from the alluvial aquifer exists down gradient of the permit
area. It will be protected from effects of the mining by its proximity '
to hard Creek, a direct recharge source.
Monitoring will be done at the six piezometer wells indicated on
the Affected Land Mai, 2.04.3(2)(a)-2 and the Proposed Surface
Disturbance t•lap, 2.05.3(2)(b)-1. Two of the wells will be on the
proposed dam in the proposed sedimentation pond, and four will be in
the proposed underground development waste site. The depths of
these wells is twenty feet. The six wells will be sampled quarterly
for water elevation and reports will be sent to the Division. One ~
•
REVISED Y.ay 8, 1991
61 ' ~
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