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<br />Mr. Jim Lunan <br />(C) The Divisio <br />which reflect all <br />monitoring system <br />occurred at Senec <br />application shoul <br />7-2 in the permit <br /> <br />-2- <br />July 28, 1986 <br />n requests that Peabody submit 3 copies of Exhibit 7-2 <br />modifications and changes to the hydrologic <br />(wells, springs, ponds and surface sites) which have <br />a II. This map, which will be placed in the permit <br />d be certified and will replace the original Exhibit <br />application. <br />The Division is concerned about the addition of total dissolved solids <br />to the surface water system in Twentymile Park from coal mines in the <br />area. Each mine which may be adding dissolved constituents to the <br />surface water system of Twentymile Park needs to accurately quantify <br />its impacts to this system. The Division feels that the monitoring <br />program described in the June 25, 1986 submittal does not fully address <br />this concern. Therefore, the Division recommends Peabody implement the <br />following revision to the hydrologic monitoring program at the Seneca <br />II mine this summer: <br />Spoils Spring No. 1 ("004 Spring"), when "Cow Camp <br />Creek" is flowing below surface station SW-S2-6, <br />should be monitored biweekly for flow and field <br />parameters (temperature, pH, and specific <br />conductivity). <br />In addition, site SW-S2-6 should be monitored for <br />flow and field parameters immediately before or <br />after the measurements are made at Spoils Spring <br />No. 1 ("004 Spring"). In late June, Spoils Spring <br />~ No. 1 ("004 Spring") should be sampled for full <br />suite ground water quality parameters. <br />During periods when "Cow Camp Creek" is not flowing <br />below surface station SW-S2-6, monitoring of Spoils <br />Spring No. 1 ("004 Spring") should he monitored <br />monthly for discharge, temperature, specific <br />conductivity and pH. <br />This monitoring schedule is the same as that proposed in the Division's <br />April 24, 1986 correspondence with the exception of the monthly <br />requirement for Spoils Spring No. 1 when "Cow Camp Creek" is not <br />flowing below SW-S2-6. <br />Surface Water <br />The Peabody responses to comments 1 through 7 and 9 satisfy the Division's <br />concerns. <br />