2008-04-30_REPORT - C1981038 (5)

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be obtained. Where possible, quality measurements are obtained at the pond inlet. Stagnant water in ponds is not sampled since water quality results would show the effects of evaporation and stock use and could not be used to evaluate potential mine affects. This report includes data collected specifically to meet requirements of the Division of Reclamation, Mining and Safety (DRMS). At the request of the DRMS, minimum, maximum and average baseline data are now presented on each monitoring point listing as well as minimum, maximum and average values for the operational period of the monitoring point and baseline periods where applicable. The baseline values are taken from all recorded sampling events until affected by the mining operation, with operational values reflecting the period following the baseline period. OVEM Groundwater Monitoring Wells: Groundwater monitoring wells 601, B02, and 604 through 608 are near the East Mine facilities (see Map No. 8-1 ). Well B07 did not have adequate water to monitor for annual water quality parameters. Well 601 was destroyed by a dozer doing maintenance work during 2002 so it is no longer monitored. Wells 602, 604 through 606 and Well 608 are monitored semi-annually for water levels to assess slope stability in and around the East mine facilities. Patterns typically associated with these wells in the past were again evident during the 2007 monitoring year. B03 is blocked and can no longer be monitored for field parameters or water quality. It has been removed from the sampling regime by TR-34. Wells B02 was not monitored during the year because of access problems. Wells 605, 606 and B08 remained dry to damp throughout the year. The water level in Well B04 was constant during the year and within the established normal ranges previously documented. Conductivity values at B07 remained within the range of values previously established. There was not adequate water in 607 to perform lab analyses. - OVWM Groundwater Monitoring Wells: • One piezometer (OVWM) was installed in the fill at the Orchard Valley West Mine. This well was destroyed during mine reclamation so it is no longer monitored. North Fork Alluvium Groundwater Monitoring Wells: Three (3) wells, MW-1, MW-2 and MW-3 (see Map No. 8-3) are completed in the North Fork of the Gunnison alluvium. During 2007 the wells were monitored quarterly for water levels and showed typical seasonal fluctuations within previously established ranges. MW-1 and MW-3 were monitored quarterlyfor quality during 2007, if water was available, to monitor potential groundwater effects stemming from the coal stockpile and load out facilities in the North Fork Valley. MW-1 and MW-3 were monitored quarterlyfor quality during 2007, if water was available, to monitor potential groundwater effects stemming from the coal stockpile and load out facilities in the North Fork Valley. Well MW-3 is southwest of the coal stockpile area in a location that should see the full impact of any potential groundwater degradation. The 2007 data continues to show that the stockpile and load-out are not degrading the water in the alluvium. East Roatcap Creek Colluvium Groundwater Monitoring Wells: Shallow groundwater monitoring wells, SM-5, SM-6, SM-7, SM-10 and SM-11 (see Map No. 4-1) are in the East Roatcap Creek drainage. The wells were monitored for water quality parameters, water levels, and field parameters to detect impacts associated with mining in the west pod. All of the wells were monitored semi- annuallyfor water levels, field parameters and water quality. SM-7 is within the projected angle-of-draw of mine workings. Water levels from the five Roatcap Creek colluvial wells continued to show typical seasonal variability with water levels elevated in the spring and lower at the end of the year. No anomalies or impacts on water levels were observed in 2007 at these wells. Steven's Gulch Colluvium Groundwater Monitoring Wells: Shallow groundwater monitoring wells, SM-1 and SM-9 (see Map No. 4-1) are in the Steven's Gulch drainage. 2