Laserfiche WebLink
<br /> <br />!~ <br />i <br /> <br /> <br /> <br /> <br /> <br />ceoal~ vsr~ <br />Ground water levels and water quality are monitored in five observation <br />wells. The wells are located as shown in Figure 2 and data describing <br />their completion are in Table 1. Included in Table 1 are data from three <br />wells that were monitored previously. but because they were intercepted by <br />the mine operation. they no longer can be monitored. The completion zones <br />described are considered ae the current interpretation for coal seam <br />nomenclature in the vicinity of the mine. Table 2 summarizes the monitor <br />well water level measurements for the period of record and Figures 3 <br />through 10 are hydrographa for the well data. Water quality data from the <br />quarterly sampling program are summarized in Tables 3 through 10. <br />A review of water level hydrographe for the monitor wells, for the period <br />of record indicates that no areawide changes in the potentiometric surface <br />have occurred as a result of mining. In general. the wells are close to <br />the miss and eater levels in wells 7A. 7H. 8 and 22 have declined. <br />indicating a gradient towards the mine has been established. at least in <br />the vicinity of those wells. Water levels in Well Noe. 10 and 16 have <br />both risen and declined in the period of record and are thought to be the <br />result of localized mine dewatering operations. The fluctuating water <br />levels close to the active mine also suggest that the ground water system <br />is not highly permeable and that normal variations in recharge and <br />discharge control the movement of the water levels. Aa overall rise in <br />eater levels ie noted in Well Noe. 23 and 65 which also suggests that <br />dewatering or changes in the ground water system caused by the mining <br />operations ie localized. <br />Water quality data from Well Noe. 16 and 23 shoe that sodium and sulfate <br />concentrations have increased at about the same time ae the changes in <br />eater levels occurred. Recent lab results from samples in Well Nos. 16 <br />and 23 indicate that the sodium and sulfate levels are nov decreasing. In <br />Well No. 10. a reduction in carbonate and total dissolved solids and a <br />alight increase in calcium. nitrogen and hardness is noted for the period <br />- 2 <br />