REP06512

• Permit No: C1981041
• IBM Index Class Name: Report
• Doc Name: 1992 Annual Hydrologic Report
• Annual Report Year: 1992
• Permit Index Doc Type: HYDROLOGY REPORT
• Media Type: D
• Archive: No

Annual Hydrologic Report
• Page Six
the 1992 Mine inflows map. Attempts to explain changes over time
are hindered by changes in mining location, changes in routing
and pumping patterns, inconsistencies in flow measurements due to
measurement difficulties, meter malfunctions and other factors.
At the Cameo No. 1 Mine only minor changes have occurred since
last year's study and since studies have been taken. Location 1
is under drains in the portal decline. Flow at this location is
affected by measurement difficulty but should be affected by
surface runoff because of its alluvial source. The recent higher
conductivity may reflect lower runoff in the last few years. The
flow at locations 2, 3, 4 and 8 may be affected by the head of
water in the alluvial material at its contact with the coal seam.
The lower runoff for the last few years could be reducing the
water level in adjacent alluvial material. The flow shown in the
reports for location 8 is primarily a function of pumping
patterns. The water level in the abandoned area cannot be
monitored, therefore, there is no regular pattern for pumping as
long as the water level stays below the seal. Pumping was
discontinued at location 3 and this flow now shows up at location
5. Monitoring at location 7 was discontinued due to poor roof
conditions. Changes in conductivity are difficult to explain.
One possible explanation for the ups and downs is the water flow
• path. At all locations except 1 and 8 the water flows for some
distance on the floor. Falling rock, traffic patterns and other
factors may change the flow path which could affect the minerals
that the water is in contact with. The mass average conductivity
this year for the total inflows was 2680 umhos/cm with a Ph of
9.1. This water is discharged through outfall 004 which had an
average conductivity of 2517 and ph of 8.8.
As usual, the Roadside Mine sees many changes. The biggest
changes are a result of mining locations and pumping patterns.
Monitoring was discontinued at locations 2 and 22 due to
reclaiming the north decline. Increased flows at locations 3 and
17 and new location 23 were a result of surface irrigation over
abandoned areas of the mine. These areas had not been irrigated
since mining occurred in 1979 - 1981. The large increase in flow
at locations 5, 10, 14 and 20 was a result of a change in mining
location and included new locations 24 and 25. Locations 24 and
25 are difficult to measure. Subsequent to the study a flow
meter reading of their combined flow averaged 130 gpm. The flow
from these locations is expected to decrease with time but
continued mining is expected to create new sources and overall
higher inflows. Flow decreases were evident at locations 13, 16
and 19 primarily 'due to dewatering subsequent to mining. The
large increase at location 15 was a function of pumping patterns.
The way 9th West panel was mined it created a reservoir of water
at the SE corner of the panel. Just prior to the inflow study a