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L REPORT SLOPE DISPLACEMENT AND WATER PRESSURE MONITORING ORCf1ARD VALLEY MINE PAONIA, COLORADO FOR COLORADO WESTMORELAND, INC. INSTALLATION • GEO-HYDRO Consulting, Inc. has installed five inclinometers and five pressure transducers at critical locations in the cuts and fills at the Orchard Valley Mine. Installation and initial readings were completed in October, 1982. The locations of all inclinometers (I1 through IS) and pressure transducers (P1 through PS) are shown on Plate 1. Coordinates and elevations of the inclinometer installations and construction details are presented in Table 1, while those for the pressure transducers are presented in Table 2. Inclinometer casing was installed in 6-inch augered borings which were backfilled with dry sand screened through a ;~10 screen into the boring to ensure an adequate packing density. Pressure transducers P1 and P2 were installed in 4-inch augered borings adjacent to inclinometers Il and I2, respectively. Pressure tranducers P3 through PS were installed in the same 6-inch borings as inclinometers I3 through IS. Pressure transducers PI through P4 were installed at an eleva- tion corresponding approximately to the original ground surface below the fill. They were installed near the middle of an approximately 10 foot sand pack section which had a seal from bentonite pellets constructed at top and bottom. Pressure transducer PS was installed at a depth of 98 feet in the colluvial soils at this location. Sand pack was installed for the full depth of this boring, with no bentonite seals. MONITORING The first set of regular monitoring readings ("current data`) were completed on t+ovember 9 and 10, 1982. The results of pressure transducer readings are presented in Table 3. Displacement measuring results from the -1- GEPNYDRO CONSUUING, fNC.