Laserfiche WebLink
a value within the 1988 -2007 range (3766 to 9580 mg /1) . The overall TDS <br />trend for this well is decreasing. <br />The Seneca II -W PHC predicts an annual average TDS value of 2630 mg /l <br />for Wadge Coal Well WW14, while a value of 5020 mg /l was observed this <br />year. However, for Wadge Coal Well WW17, a value of 3002 mg /l was <br />predicted, while a value of 650 mg /l was observed this year. <br />As noted in the previous paragraph, Well WW14 experienced this year a <br />TDS exceedance of the PHC prediction. This prediction was based on <br />several assumptions. 1) Baseline water quality values were an average of <br />all Wadge coal wells at Seneca II -W. 2) Aquifer characteristics were an <br />average of all Wadge coal wells at Seneca II -W. 3) The Wadge coal seam <br />was saturated for its entire thickness (11.8 feet) . These assumptions, <br />however, do not hold true for Well WW14. Prior to mining in the north <br />area (November 1992), this well was almost always dry (see the 1993 AHR <br />for a complete listing of earlier water level data). Since this <br />particular portion of the Wadge seam was dry prior to mining, spoils <br />water will now contribute much of the water present. Also, the water <br />level this year, 7.18 feet, indicates that additional strata are being <br />saturated, which may also explain the elevated TDS value. <br />Agricultural ground water standards were exceeded this year at certain <br />monitoring wells. Tab 7 of the Seneca II -W PAP contains a section that <br />discusses the suitability of using water from the various aquifers <br />monitored at the Seneca II -W Mine for irrigation or livestock watering. <br />The discussion mentions that all aquifers prior to mining at the Seneca <br />II -W Mine have exhibited several parameter concentrations in excess of <br />both irrigation and livestock standards compared, rendering them <br />questionable regarding their suitability for either irrigation or <br />livestock. All bedrock aquifers affected by mining have been determined <br />to have transmissivities less than 100 ft2 /day, which would also <br />preclude their use for yielding sufficient water for irrigation, or even <br />livestock. <br />X <br />