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Colorado Department of Public Health and Environment (CDPHE). <br />NPDES Exceedence Incidents <br /> OUTFACE <br />QUARTER OOIA 004A 006A 007A OlOA <br />2/96 TSS', Fe= <br />1/96 TSS, SS', Fe TSS, SS, Fe TSS, Fe TSS, Fe <br />4/95 TSS, SS <br />3/95 TSS, Fe <br />'Total Suspended Solids z Iron 'Settleable Solids <br />3. Potential Effects on Ground Water <br />The mine's operations have affected and will affect bedrock ground water of one formation, the <br />Williams Fork Formation. The Williams Fork contains the ten coal seams to be mined and is the <br />surface outcrop on the permit azea. Ground water within the permit area occurs under perched <br />conditions in the interbedded and lenticular sandstones of the Williams Fork Formation. These <br />sandstones are predominately fine to medium grained, poorly sorted and calcareous. The <br />thickness of the sandstones is estimated to be 1,600 feet. There is no continuous, regional <br />ground water system on the property within the stratigraphic section of the Williams Fork <br />Formation. This was documented in the 1979 report prepared by Leonard Rice Consulting Water <br />Engineers' study (LRCWE). The report concluded that there was an absence of ground water <br />from the site (see Exhibit 7A of the Permit). In addition, 17 test holes were drilled and their <br />corresponding records collected when the property was originally explored. All well data <br />conFrmed that where water was encountered, it was limited both vertically and laterally and <br />encountered under perched conditions. For further information on the well test data, see pages <br />2.04.7-5 and 6 of the permit. <br />41 Revised October 30, 1997 <br />