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<br /> <br /> <br />3. A request is made by Peabody (p. G-7) to modify the previous commitment <br />for annual surveys of sediment level in the sediment ponds. This <br />commitment was made at the time of abatement of NOV C-85-081. The <br />request is to reduce the frequency of surveys to every five years for <br />Ponds 002 and 003 and every two years for Pond 004. <br />In correspondence received from Peabody on November 5, 1985, an estimate of <br />0.38 acre-feet/year is provided for the annual sediment yield for Pond 004. <br />From the data provided by the annual survey and reported in Appendix G, an <br />actual value of 1.29 acre-feet was evident at Pond 004 during 1986. This <br />discrepancy illustrates the usefulness of actual data obtained on an annual <br />basis. The problem noted in the discussion on the accuracy of surveying <br />methods and registration of the survey grid also points to the need for annual <br />information. These considerations should be made in the review of Peabody's <br />request at the time the revision is submitted. <br />/lal <br />cc: Michael Savage <br />1879E <br />