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Thirteen existing and nineteen unconstructed temporary stock tanks are <br />• proposed by the end of 1992 in the Seneca II reclamation areas. Exhibit <br />7-7 shows the locations of the existing tanks and proposed locations of <br />the unconstructed stock tanks. The tanks have been numbered for <br />purposes of referencing monitoring locations. The following stock tank <br />monitoring program is proposed to address the requirements of Rules <br />4.05.9 (1)(a)(b) and (d). <br />Part (1)(a) of Rule 4.05.9 addresses whether the quality of the <br />impounded water is suitable for its intended use and whether any pond <br />discharges would meet applicable State and Federal effluent standards. <br />Water quality monitoring at representative stock tanks will include <br />analyses for those chemical parameters for which the State of Colorado <br />has established livestock standards. Table 1 summarizes the complete <br />list of chemical parameters that will be analyzed. Water quality <br />sampling will be conducted on a monthly basis from June through <br />September. Water quality samples shall consist of a composite of <br />multiple samples collected spatially across the pond. Of the existing <br />• and unconstructed temporary stock tanks shown on Exhibit 7-7, Peabody <br />proposes to monitor tank numbers (T2, T5, T7, T12, T17, T25, T27, 730 <br />and T32) for data to satisfy Rule 4.05.9(1)(a). <br />Part (1}(b) concerns water persistence. Monitoring for water <br />persistence will involve the installation of calibrated staff gages in <br />the deeper portions of the tanks. Multiple transects will be surveyed <br />through the as-built stock tank bottoms to facilitate the development of <br />stage-capacity curves. Water stage values read from the staff gages <br />will be used to calculate tank volumes over time. Water persistence <br />monitoring will be conducted at each of the tanks on a monthly basis <br />from June through September. <br />As the stock tanks will also provide a source of water for the local <br />wildlife, Peabody will periodically document during the Spring, Summer <br />and Fall seasons the usage of water from the tanks by wildlife. <br />Documentation will be in the form of number and kinds of tracks present <br />• around the perimeter of the tanks. <br />7-2-1 Revised 02/06/91 <br />