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Pursuant to 4.05.8(3), temporary storage of acid or toxic forming spoil may exceed <br />30 days if the operator demonstrates that burial or treatment is not feasible within <br />30 days due to weather conditions or other specified factors, and will not result in <br />material risk of water pollution or other environmental damage. If deemed <br />necessary by the Division based on the quantity, location, and chemical <br />characteristics of any temporarily stored acid-forming or toxic-forming spoil, such <br />spoil shall be placed on impermeable material. <br />E. Surface and Ground Water Monitoring <br />Ground Water <br />Tab 7 of the permit application contains baseline ground water hydrology <br />information. Section 7.1 contains the entire contents of Tab 7 from the previously <br />approved permit application package. Section 7.2 contains updated information for <br />the Seneca II-W South Extension Area. Tab 15 describes the operational ground <br />water monitoring program. The current hydrologic monitoring program is presented <br />in Appendix 15-3a of the permit application package. Monitoring locations are <br />shown on Exhibit 7-1. <br />Ground water studies in conjunction with the Seneca II-W Mine site have been <br />concentrated in the Upper Mesaverde Group and alluvial aquifers. Specifically, <br />aquifer characteristics and/or water quality analyses have been performed in the <br />Wolf Creek coal, Wolf Creek/Wadge Interburden, Wadge coal, Wadge coal <br />overburden, and the Hubberson Gulch alluvium. Quantity and quality data have also <br />been collected from ten springs and seeps in and adjacent to the permit area. <br />Each of the identified aquifer zones are hydraulically discontinuous with the units <br />above and below. Therefore, each aquifer will be discussed as a separate entity. <br />Wolf Creek Seam <br />The lowest coal in the Williams Fork Formation of the Mesaverde Group is the Wolf <br />Creek seam. The Wolf Creek seam is the first aquifer encountered below the bottom <br />of the mine pit. <br />Depth to water and water quality measurements have been made at three sites in and <br />adjacent to the permit area. Water levels in the Wolf Creek at all threesites exhibit <br />confined conditions. Dependent upon proximity to the outcrop recharge area <br />(paralleling the Sage Creek anticlinal axis), and local structure, each well has <br />varying amounts of head. Ground water flows from the recharge area to the center <br />of the basin. Therefore, the major component of flow appears to be toward the <br />west. <br />Seneca II-W Findings Document 20 June I5, 2001 <br />Permi[ Renewal No. 3 <br />