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r Seneca II - AHR - 2 - April 1, 1986 Wolf Creek coal completion GW-S36WC has also lost head due to the proximity of mining. This well, as does GW-S360, directly intercepts the projected flow of the Wolf Creek Aquifer. Of some concern, is the drop in water level at We11 GW-S45P], a Wolf Creek coal completion. This well is located on the southeast side of the Tow Creek Anticline, and would not be expected to be impacted by mining. The well has lost about 80 feet of head in 16 months. To try to quantify this loss, Seneca should immediately incorporate water level measurements at Wells GW-S40WC and GW-S41WC into the monitoring program. This increased monitoring should help to determine if this is a localized or a more aerially extensive trend. Srins Seneca began a spoils spring survey in 1985. A11 spoils springs were mapped. Those which flow more than three gallons per minute were sampled for field parameters. In the future, a more extensive monitoring program is recommended. The "004 Spring", when "Cow Camp Creek" is flowing below SW-52-6, should be monitored biweekly for flow and field parameters. this spring should be sampled in late June for a full suite water quality analysis. In addition, field parameters (including flow) at SW-S2-6 should be measured at the same time as at the "004 Spring". Recommendations To briefly summarize the above recommendations for future monitoring: 1. Begin water level measurements at We11s GW-S41WC and GW-S40WC; 2. Increase frequency and quality of spoils spring discharges to Twentymile Park during the growing season. At this time, the concern is most significant when "Cow Camp Creek" is flowing below Site SW-S2-6; 3. In addition, it would be beneficial to the Division if Peabody Coal would supply a map which depicts the mined area since 1981, and projected mining for the following year. This map should be overlain by Exhibit 7-2 "Potentiometric Surface and Monitoring Stations". /ph 8905E