PERMFILE136903

• Permit No: C1983058
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: Reduction in Groundwater Monitoring
• Section_Exhibit Name: TR1
• Media Type: D
• Archive: No

Memo to Twin Pines from L, G. l'Jhite, Dec. 6, 1983
Page 3
d) Dravring PIo, TP-o ores derived from aerial photographs and
• field reconnaissance of the mine area. Outstanding features
in the area which may contribute to the vrater supply at the
mine are as follows:
1) The mine slope was cieveloned near the creek bed,
possibly crossing the alluvial base in the stream bed,
A hand-dug yell dovnstream from the slope would
indicate the aresence of an underfloor in the alluviam,
2) A clay pit, e::cavated to vrithin 20 feet of the coal seam,
lies adjacent to the mine sloe, There is standing vrater
in the bottom of the nit.
j) several strip mines have been developed in the Brookside
seam uadip from the mine, It rras reported that the
coal in the high wall eras augered after stripping,
1+) L;:amination of an aerial photograph of the mine area
indicated the presence of a fault vrhich when projected
crossed the air shaft of the mine, The strike of the
possible fault is approximately S 28° PJ, F~.eld recon-
naissance in Coal Creels Canyon indicated a substantial
roll in the sandstone formation outcror_~ped in the south
erall of the canyon in the area of the possible fault,
The vrater flooring in Coal Creek disappeared just downstream
from the roll, l;xamination of the mine man from Coal
• Creek Canyon l~line confirms the aresence of a source of
crater along the strike of the possible fault,
5) The eater table in a cased drill hope, 4:no~an as Hole CC-42,
~;ar«r :ke down din from the aba^doned T::in Fines I~Line
correlates eri th the ;rater table; in monitoring ',Nell No.
TP-!'ll, The erorhings near the cell erere reported to be
c?ry.
3. Con clusions: The follocring conclusions can be dravrn after review
of the facts presented above,
a) There are at least t~ao distinct separate sources of water
contributing to the accumulation of water in Cal dirola No. 2
Kline: 1) ^1he aquifer underlying the Brookside coal seam
contributes to the ~~ool in the vresterly portion of the mine;
as reported in the S,O.A.P, re_ort and by men who vrorked in
the mine, production from this aquifer is very low. 2) 'JJater
in the upper portion of the mine results from a spring in the
rock slope and possibly contributions from surface sources,
The vrater quality of the upper pool is certainly not vrhat
erould be expected from vrater in an abandoned mine.
b) The roll in the coal below the upper sump trapped spring
water to form the upper pool,
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