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<br />Bear Coal Company
<br />2
<br />
<br />May 11, 1994
<br />Our subsidence and slope stability surveys up through July of
<br />1990 were performed using a Wild T-2, 1 Second Theodolite with a
<br />top mount K & E Autoranger Electronic Distance Meter. For sur-
<br />veys performed from November of 1990 to the present date, we have
<br />used a Lietz Set 2 Total Station which is a 1 Second Theodolite
<br />with a Coaxial Electronic Distance Meter. Starting with the July
<br />1991 survey UTE is using a new coordinate geometry software
<br />program to adjust the survey data. The software is new but uses
<br />the same Crandall method of adjustment.
<br />Slope Stability Stations at Bear #3 Are Tied to D-11-U and D-12-U
<br />through a series of primary loops:
<br />Bear #3 U 16
<br />U 17
<br />U 18
<br />U 19 4
<br />U 23 5
<br />U 24 6
<br />Table 1 is a list of slope stability Stations with their coor-
<br />dinates and elevations from August, 1985, through May, 1994 and
<br />the resulting mean values.
<br />TABLE 1
<br />SLOPE STABILITY
<br />BEAR MINE NO. 3
<br />Northing Fasting Elevation
<br />STATION U16
<br />August, 1985 404,057.57 1,441,800.00 6267.62
<br />July, 1986 404,057.62 1,441,799.98 6270.39
<br />November, 1986 404,057.61 1,441,799.98 6270.36
<br />July, 1987 404,057.70 1,441,800.04 6270.33
<br />October, 1987 404,057.73 1,441,800.05 6270.37
<br />June, 1988 404,057.86 1,441,800.06 6270.35
<br />November, 1988 404,057.85 1,441,800.07 6270.38
<br />July, 1989 404,058.03 1,441,800.06 6270.37
<br />November 1989 404,058.06 1,441,800.02 6270.39
<br />July, 1990 404,058.12 1,441,800.04 6270.35
<br />November, 1990 404,058.14 1,441,800.06 6270.37
<br />July, 1991 404,058.28 1,441,800.10 6270.35
<br />November, 1991 404,058.32 1,441,800.12 6270.36
<br />July, 1992 404,058.43 1,441,800.05 6270.34
<br />November, 1992 404,058.44 1,441,800.04 6270.37
<br />June, 1993 404,058.61 1,441,800.01 6270.28
<br />October, 1993 404,058.58 1,441,800.09 6270.33
<br />May, 1994 404,058.64 1,441,800.08 6270.26
<br />MEAN 404,058.08 1,441,800.04 6270.351
<br />1 Mean Elevation does not include August, 1995
<br />4 Monument = #5 Rebar
<br />5 Monument = #7 Rebar in concrete
<br />6 Monument = #6 Rebar
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