2015-03-24_REVISION - C1981014 - Laserfiche WebLink

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Included with this submittal are graphs incorporating all available data for the above parameters, plotted as parameters against time. For this purpose, data are available for wells MW 16, MW23, and MW65. Monitoring data for well MWNW has been collected throughout the monitoring period for the Southfield Mine. No water samples have been collected from the well as the well has been dry to the depth to which levels in the well can be confirmed throughout the monitoring period This monitoring information has been provided to the DRMS since approval was given to commence monitoring the well. An analysis of the data shown on the graphs for the three wells follows. Since there are considerable fluctuations in the data, a moving average trend line is shown on each graph to show a pattern or trend more clearly. Data presented for well MW 16 indicate wide fluctuations in values over time for the indicator parameters including IDS, manganese, and iron. The variations in quality data values, and similar wide fluctuations in water levels, suggest that groundwater in the well is affected by surface water. This well is located in close proximity and dawn -dip from abandoned mine workings within the some monitoring horizon. These mines are believed to be flooded, and are recharged by precipitation. The Southfield mine did not influence MWl6 until close to the end of operations in 2000, when a panel was mined between the well and the old mine works. This mining apparently caused the well to go dry by 2001. Prior to 2001, TDS values are seen to vary widely, then after 2001 trend downward before the well went dry. When the well recharged briefly in 2003 -2005, TDS levels were similar to those measured when mining began in 1980. Similarly, iron and manganese levels fluctuate over time, and after mining ceased in 2000, are at or below the levels when mining began. For the remaining parameters included on the graphs, most show wide values over time with declining values after the end of mining operations. A review of the data for well MW23 shows IDS and manganese levels increasing soon after mining commenced in 1980, then remaining in a close range during and after mining operations. Iron values are high at the start of mining, increase slightly between 2003 and 2010, and then have remained low since 2010. Data shown for the remaining parameters show parameter values generally remaining in a close range from the start of mining through the post-mining period. Quality data included for MW65 begins in 1984 when the well was established TDS values are higher during 1984 through 1986, then stay in a reasonably close range during mining and after operations ceased. Similarly, some iron levels were higher during the period 1984 through 1988 than the remainder of mining operations, then have declined after 2000. Manganese values increased from 1984 through 1988, then remained stable during mining, and have decreased after mining ceased in 2000. Data included for the remaining parameters show that concentrations have remained in a reasonably close range as monitored during and after mining operations. Review of all groundwater monitoring data shows that no significant adverse quality trends have developed at any of the three monitoring wells. From these results we believe that there does not appear to be any decrease in coal seam groundwater quality resulting from the Southfield mining operation as compared to coal seam groundwater quality prior to mining operations. 2. Full data set of surface water flow measurements Accompanying submittal of the IR43 Application, EFCI provided stream flow data from 2000 through 2013. Included with this submittal is a table showing all streamflow measurements beginning in 1985,