REP29099

• Permit No: C1982057
• IBM Index Class Name: Report
• Doc Date: 2/28/1992
• Doc Name: 1991 ANNUAL HYDROLOGY REPORT TEXT
• Annual Report Year: 1991
• Permit Index Doc Type: HYDROLOGY REPORT
• Media Type: D
• Archive: No

attempt at this well, when the casing volume was 2.2 gallons, verified that not enough •
water could be hailed to evacuate the stagnant water in the casing, and then provide fresh
water for a representative sample. As yet, no samples have been collected from this well
due to low casing volumes.
Well 170V, located downgradient of the central portion of [he south mining area, displays
a NaNgCa-504 type water with an average TDS value in 1991 of 6,200 mg/l. This value is
both lower than the baseline average (8,272 mg/l) and the baseline range (7,928 to 8,586
mg/l ).
Vell 180V, located at the south end of Che south mining area, displays a MgCaNa-HC03 type
water with an average TDS value in 1991 of 764 mg/l. This value is both lower than the
baseline average (775 mg/l) and the baseline range (740 to 798 mg/L)
Vadge Coal. Vell 14V is located in [he proposed north mining area. No water was observed
in this well in 1991. Either very little or no water has ever been observed at this well
and, consequently, no water samples have ever been collected.
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average TDS value in 1991 of 6,516 mg/l. This value is considerably higher than both the
baseline average (1,330 mg/t) and the baseline range (1,208 to 1,600 mg/l). TDS values
were significantly higher beginning with the June, 1990 sample. As a result of a low
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transmissivity (0.08 ft /day) and low casing volumes (e.g., 6.2 gallons in June, 1990),
only 87 gallons has ever been removed from this well prior to the June, 1990 sample.
Because of this, tit is possible that water used during the drilling of this well
(source-HUbberson Gulch) was retained in the well and affected the chemistry (TDS) of
samples collected prior to June, 1990- The high TDS measured beginning in June, 1990
probably reflects eater from the formation as prior withdrawals have finally removed water
used for drilling. Since no mining has occurred in this area, the high TDS value must be
a result of natural conditions.
Vell 16V is located at [he north end of the south (current) mining area. Little or no
water was present in this well prior to July, 1991 and, therefore, no sample had been
taken. However, in July, 1991, this well experienced a dramatic increase in its water
level and a sample was then taken. This sample displays a Na-504 type water with a TDS •
value of 3,232 mg/l.
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