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Comment 3. <br /> RESPONSE: <br /> Flow out of the highwall seep is extremely diffuse. The flow occurs on <br /> a vertical section of the highwall beginning about 10 feet from the top <br /> extending downward for more than 8 feet. The width of this seep varies <br /> between 20 and 50 feet, depending on the season. Access to the "main" <br /> portion of the seeping flow (that area that produces enough discharge to <br /> practically monitor) is difficult, usually requiring personnel to either <br /> hang precariously from above or use a ladder to sample or observe the flow <br /> from the bottom. <br /> Flow behavior at Spoils Spring No. 1 is also diffuse, often issuing from <br /> several locations of the exposed bedding planes. At this site, the <br /> discharge quickly is absorbed into the downslope soil surface. <br /> Because of the diffuse nature of flow at these two sites, and in part <br /> due to the variability in discharge over time (season) , meaningful <br /> measurements of the entire discharge at any seeps/springs at Nucla is <br /> not possible. However, Peabody will continue to monitor portions of <br /> spring/seep discharge using either of three methods: 1) bucket and <br /> stopwatch; 2) portable cutthroat flume; or 3) visual estimate. <br /> Discharge monitoring will be conducted at the most consistently <br /> discharging portion of each spring/seep. Peabody will establish a spot <br /> at each spring where future monitoring of discharge will have the most <br /> potential . Estimations of the total discharge will be based on the <br /> above-mentioned monitoring. <br /> Peabody has revised the monitoring program offered in the Permit Revision <br /> to reflect the above-mentioned commitment. Revised text can be found on <br /> Table 2 of the 1986 AHR (page 8) and on Table 7-23 of the Permit Revision <br /> (page 7-73) . <br /> Comment 4. <br /> RESPONSE: <br /> During 1986, Peabody installed three monitoring wells which were placed <br /> in or near Mining Areas 2 and 3 (see Exhibit 7-8, Wells GW-N23, GW-N24, <br /> and GW-N25) . All three wells were completed in the overburden, Dakota <br /> 5 <br />