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Subsurface Water Monitoring and Analysis <br />Since the initiation of a formal ground -water sampling program in January, 1982, <br />subsurface water quality information has been collected from monitor wells at the <br />Keenesburg Mine. The present ground -water monitoring program provides <br />information which can be compared to the earlier baseline conditions relative to <br />groundwater movement and quality in the formerly active operations areas (now <br />used for ash disposal as part of the reclamation effort). <br />The results obtained from data collected in the field and from comprehensive water <br />quality analysis indicate that surface and ground -water quality has not been <br />significantly impacted by the mining operation, nor altered from the natural pre - <br />mining condition. In addition, regional ground -water movement patterns have not <br />been significantly influenced, altered or interrupted by the mining or reclamation <br />activities. <br />The subsurface water wells are monitored semi - annually April and September. <br />Quarterly sampling will resume at least one year prior to final bond release. The six (6) <br />wells presently monitored are: <br />1) FPW <br />2) DH -122 <br />3) DH -96 <br />4) AMW -1 <br />5) SMW -2 <br />6) AMW -2 <br />Note: This is also the order in which the wells are sampled, based on <br />historic and present salinity levels. "Analysis" includes both field and laboratory <br />work performed on samples taken from all wells. <br />The sampling procedure to be used is described herein: <br />The order of sampling of the wells is determined based on the historical <br />salinity level of each of the wells relative to the others. The well with the <br />lowest salinity level is sampled first, followed by the others, in increasing <br />value. This order will protect each well against possible data <br />contamination from a higher salinity well. Following a visual examination <br />of the physical condition of the surface area around the well casing, and the <br />casing itself for damage or unusual conditions, the cap is removed and the <br />static water level is measured, from the top of the well casing, and <br />recorded. A one (1) liter sample bailer is used to remove five (5) bailer <br />volumes of water. The fifth bailer volume is used to rinse the field sample <br />containers. A sixth bailer volume is used to fill the field sample container. <br />The field sample is then analyzed and values are recorded for temperature, <br />pH, and electrical conductivity. <br />56 <br />