Laserfiche WebLink
The pH values for all of the Trapper wells are within the range of natural values for these ,~ <br />aquifers. The pH values for the four backfill wells are within the range observed in the other <br />aquifers. <br />The increase in the SAR in wells GBS and GE2 are caused by a decrease in the calcium <br />and magnesium concentrations not an increase in sodium. This change occured after mining in <br />these two areas but was abrupt which is not typical of ground-water changes. The high SAR's in <br />wells GF2, GF3 and GF4 also existed prior to mining in this area and also are due to very low <br />calcium and magnesium concentrations. The SAR values in backfill well GFS are similar to the HI <br />aquifer values in this area prior to mining. The SAR values in well GP4 were higher prior to mining <br />than present values. The present values, even though greater than l5, are thought to be natural. The <br />QR seams have not been mined near well GPS. The higher values in this well existed prior to the <br />mining of the HI seams in this area. The higher SAR's in well GPS have to be natural due to its • <br />distant location from mining. Flow from the Trapper mine pits does not move in the 3rd White <br />Sandstone to well 8103A and, therefore, the high SAR values in this well have not been caused by <br />Trapper mining. The high values existed prior to the B pit mining to the south of well 8 ] 03A. High <br />SAR values are naturally common in the Trapper ground water. Mining does not seem to have <br />affected the SAR values at this site. <br />The decrease in calcium and magnesium concentrations in wells GBS and GE2 occurred <br />after mining in these two areas. Their decrease is very abrupt which is not typical of water quality <br />changes in ground water. The increase in sodium concentrations in well GA1 would not be <br />expected to be due to mining because the QR has not been mined upgradient of this well. Mining <br />has caused the water level to decline at well GA1. which has resulted in less water in this well. <br />Decreasing trends for sodium concentrations are being observed in wells GF7 and GP6. The decline <br />T~-66 • <br />6-4 (Revised 09/21/95) <br />