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necessary by the Division based on the quantity, location, and chemical characteristics of any temporazily stored acid-forming or toxic-forming spoil, such spoil shall be placed on impermeable material. E. Surface and Ground Water Monitoring Ground Water Tab 7 of the permit application contains baseline ground water hydrology information. Section 7.1 contains the entire contents of Tab 7 from the previously approved permit application package. Section 7.2 contains updated information for the Seneca II-W South Extension Area. Tab 15 describes the operational ground water monitoring program. The current hydrologic monitoring program is presented in Appendix 15-3a of the permit application package. Monitoring locations are shown on Exhibit 7-1. Ground water studies in conjunction with the Seneca II-W Mine site have been concentrated in the Upper Mesaverde Group and alluvial aquifers. Specifically, aquifer characteristics and/or water quality analyses have been performed in the Wolf Creek coal, Wolf Creek/Wadge Interburden, Wadge coal, Wadge coal overburden, and the Hubberson Gulch alluvium. Quantity and quality data have also been collected from ten springs and seeps in and adjacent to the permit azea. Each of the identified aquifer zones are hydraulically discontinuous with the units above and below. Therefore, each aquifer will be discussed as a separate entity. Wolf Creek Seam The lowest coal in the Williams Fork Formation of the Mesaverde Group is the Wolf Creek seam. The Wolf Creek seam is the first aquifer encountered below the bottom of the mine pit. Depth to water and water quality measurements have been made at three sites in and adjacent to the permit area. Water levels in the Wolf Creek at all three sites exhibit confined conditions. Dependent upon proximity to the outcrop rechazge azea (pazalleling the Sage Creek anticlinal axis), and local structure, each well has varying amounts of head. Ground water flows from the recharge area to the center of the basin. Therefore, the major component of flow appears to be toward the west. Aquifer tests were performed on the two updip wells during the summer of 1980. These tests indicate that the Wolf Creek is a fairly well confined aquifer which transmits limited amounts of water. One well was pumped at an average of 1.2 gallons per minute for about 3 1/2 hours, and produced no observable drawdown at Seneca it-W Findings Document 2Q November 3, 1999