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-4- • Ground Water There are four types of ground water monitoring done by wells and piezometers: coal seam, alluvial, refuse, and sediment pond. The monthly monitoring results can be found in the Monitoring Data Section. Average water level, pH and conductivity have been tabulated in Table G-83. The coal seam monitoring consists of a well for the D, E, and F seams, and two piezometers each for the E and D seams. The water 7eve1 in the wells and piezometers is monitored monthly. The water level in all but the F-1 well generally increased during the year. The F-1 exhibited a seasonal variation. Recharge for the coal seam aquifers is from the north, possibly somewhere under Grand Mesa. The higher than normal snow pack and precipitation on the Mesa may have been the cause of higher water levels. The sampling was reduced • from a quarterly full list analysis to a monthly field analysis. The reduction in the pH on the D-1 and E-1 wells may be a result of the amount of pumping done in 1982 for the Kaman Tempo Hydrologic Report of September, 1982. The conductivity on the D-1 and F-1 wells remained relatively constant. The conductivity on the E-1 has been declining, possibly due to outcrop-subcrop inflows. The alluvial ground water monitoring consists of three wells and ten piezometers. These piezometers generally showed a seasonal variation in water level, with the low level being in February and the high level in mid-summer. These variations may correspond to the irrigation practices in the area. No observations were made associated with the pH and conductivity. The S-1 piezometer was drilled for the Kaman Tempo report, but was not listed because it is in formation, rather than alluvial material. It is included in this list because it is in line with A-8 through A-12 along R-50 Road. The refuse piezometers were installed to monitor the ground water level and quality associated with the disposal of underground development