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the additional spoils wells in the areas of greatest saturated thickness adjacent to the furthest downslope highwalls and in the near uparadient zones of transition between greater and minimal saturated thicknesses. Two spoils wells are proposed near 18500E, 305005. In addition, two monitoring wells completed in the undisturbed Wadge and Wolf Creek coal seams near 19,500E, 25,5005 were agreed upon with Ci1LRD. It was felt that these wells would clarify what the actual potentiometric heads for the two aquifers were at that point since well GW-S45P1 water levels are anomalous and suspect. COi;ME`;T: d. The discussion pertaining to water sampling iechnieues should be updated to reflect either (i) a sampling quality assurance program (duplicates, blanks, spikes, etc.) or (?} field meter certifications. RESPONSE: The field mater quality monitoring equipment which Peabody Coal Company's field hydrologist uses at the Seneca ii Y~ine consists of a YSI ccrductivity meter, Oricn and EXTECH oN meters, and a thermometer, calibrated in degrees Centigrade. On ar. annual basis, this equipment will be tested against similar laboratory equipment owned and operated by r3ookc'.iffs (EPA certified) Laborator}~, Steamboat Springs. If PCC's equipment fails to meet tiie manufacturer's accuracy levels for that particular piece of equipment being tested, PCC will repair or replace it immediately. The t;nnual Hydrology Report will state when the equipment testing took place. The discussion in Tab 7, Section VII..4.3. has been revised to reflect this field meter certification program. COMNEiVT: 5. Tfre revised text does not indicate whether the 007 pond outfall will he monitored with a flume and continuous recorder as is done at other i1PDES sites. Peabody should commit to continuous • monitoring at this site. Furthermore, Peabody should establish a simple crest stage gauge at site S'~1-52-9 to be consistent with other surface t•~ater monitoring sites. 17