REP00024 ‎(3)‎

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wells. The discontinuation of mining operations has eliminated pumping and dcwatcring of Pit #1 which
was anticipated to increase water levels in the down dip Wells 1, IA, 1B and 1C.
' Analysis of groundwater quality from the monitoring wells in the Pit #1 area indicated that the water
is of a sodium sulfate to sodium bicarbonate type with high sodium and sulfate concentrations. Well 113
is a sodium sulfate to sodium hydroxide type water. All analyses were generally consistent with previous
samplings. Analyses of metals for these wells are all within acceptable limits. Results of all water quality
analyses are presented in Appendix 1. Graphs for well water quality parameters of TDS, SAR, ammonia,
and pH are exhibited in Figures 2 through 5.
Well 7, located in the reclaimed area, was dry during the 1984 samplings, however, has had water since
then. Water level in Well 7 may indicate the development of a spoils aquifer which may be due to the
general increase of pit water in the adjacent up dip kerr surface mine and WFC's pit down dip of the well.
The water which was sampled indicates a sodium bicarbonate type. This water exhibits a better quality then
that sampled in the down dip wells and has a lower degree of ionization with lower TDS and metal
concentrations.
' NPDES SAMPLING
' Surface water runoff from the disturbed areas of the mine was passed through one of the three
sedimentation ponds prior to discharge. NPDES reports were filed with both the Water Pollution Control
Division of the Colorado Department of Health and CMLRD. Discharges were made only during the
snowmelt period of the second quarter (April-June).
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