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Ms. Anne Baldrige Page 4 November 5, 1985 To date, There have been no suspended solids excursions for pond 004 during its 3.1 year life span. Pond 003 has had five excursions in 5.7 years, with all five excursions occuring within only the first seven (7) months of 1980. This can be related to the disturbances associated with construction of the pond and a lack of vegetative cover which did not fully establish until later in the growing season. Pond 002 has hod three excursions in 5.7 years, with occurrences in September 1983, July 1982 and March 1980, respectively. It is therefore concluded that the estimated actual sedimentation rates presented earlier are probably more representative of actual conditions, that mitigative measures to control sediment in the mine disturbance areas before reaching the sediment ponds are success- ful, and that the sediment ponds are functioning as required. PCC proposes to implement a sediment level monitoring schedule of every ~ Years based on the storage volumes presently available. PCC will continue to observe sediment pond conditions as part of current reclamation management procedures. Sediment level monitoring may be implemented sooner if field observations indicate excessive sedimen- tation levels. The method for surveys will follow methods outlined earlier in this letter. Permanent reference points have been established to insure consistency iri measurements and accurate comparability. It is PCC's understanding that submittal of the information contained within this letter and subsequent concurrence by CMLRD, satisfy the abatement steps and requirements in NOV C-85-081. If you have any questions or require further clarification, please contact me as soon as possible for timely and positive resolution of this issue. Sincerely, ~~"'..~1 f~rsr,:.,"""' "~..' Vern Pfannenstiel Colorado Project Manager kmt c: Curt Belden Slade Dingman Mike Hyer Jim Lunan Lynn May Terry O'Connor Leonard Shearer Tom Wainwright Don Zulian