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. calibrations are performed by using the pH 7 and pH 10 buffer solutions, since the pH of <br />most waters sampled at the Nucla and Nucla East Mines range between 7 and 9 pH units. <br />However, the lower buffer solution (pH 4) is used for •two point calibrations prior to <br />measuring water historically known to exhibit pH values less than 7 pH units. One-point <br />calibrations involve using the pH 7 buffer solution. <br />Table 3 presents the current parameter list for surface water sample analysis at the Nucla <br />Mine. As requested by CMLRD in a letter from Mr. John Doerf er submitted to Peabody on May <br />4, 1987, Peabody has revised the parameter list to include total recoverable analysis of <br />metals instead of total analyses. Total recoverable analysis for the parameters listed in <br />Table 3 have been performed since March 25 of 1987. This revised surface water parameter <br />list also applies to analyses performed on samples obtained at all Nucla East monitoring <br />sites. <br />Silver and chromium were analyzed for twice during the 1987 water year in samples obtained <br />from both surface and ground water samples taken from monitors at both the Nucla and Nucla <br />East mining areas. The results of these analyses can be found in Appe nd~i ces D, E, and J. <br />Upon further perusal of the data, Peabody will submit a formal request to the MLRD for a <br />• variance from sampling for silver and chromium in both surface and ground water. <br />Baseline Monitoring Program - Nucla East. Surface water monitoring activities conducted <br />since July of 1986 at monitoring sites established in and around Peabody's proposed Nucla <br />East mining area have been consistent with the approved baseline monitoring program, This <br />program was proposed and outlined in a letter submitted to Mr. Steve Renner from Peabody <br />personnel on April 21, 1986. Approval of the baseline monitoring program for the Nucla <br />East mining areas was issued, with minor amendments, in a letter received by Peabody from <br />Mr. Peter O'Connor of CMLRD on May 6, 1986. The locations of each surface water <br />monitoring site in the Nucla East area is presented on Exhibit 1. Table 4 lists each <br />Nucla East surface water monitoring site, location and type of measurement performed. <br />Data Svmmary. Surface water data (including NPDES monitoring data) collected at the Nucla <br />Mine and Nucla East mining area during the 1987 water year are presented in Appendices B <br />through E (see List of Appendices, Table of Contents). Nucla East data collected since <br />July of 1986 are included in these attachments. Trvo sets of water quality data are <br />provided, as the first set includes reports of analyses performed for total metals, and <br />the second set includes reports of analyses for total recoverable metals, which began in <br />March of 1987, <br />8 <br />