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III IIIIIIIIIIIIIIII <br />999 <br />RECEIVED <br />January 2, 2001 JAN 0 3 2002 <br />Division of Minerals 8 GeolxJy <br />Ms. Carla J. Leril:ey <br />Environmental Protection Specialist <br />Colorado Department of Public Health and Enviromnen[ <br />Water Quality Control Division -Permits and Enforcement <br />4300 Cherry Creek Drive South <br />Denver, Colorado 80222-1530 <br />Subject: Permit No. CO-0042161, Reported Db1R Violation - Oulfall 002A <br />Dear Ms. Lenkey: <br />I received your telephone message this morning regarding the subject violation, and <br />reviewed the permit again, finding section iv, Percentage Removal Requirements (BODs <br />Limitations) under Part I, Page 4, of the Perniit. My understanding of the reporting <br />requirements, as discussed in my letter of December 18, 2001 was in enor. <br />The subject Outfall did not discharge in July or August, but only for the last two weeks in <br />September, allowing one required BODs (mg/1) sample to be collected and analyzed that <br />month, however I was unfamiliar with the associated reporting requirements for BODs <br />Removal %. An erroneous value was inadvertently entered under the % removal <br />parameter on flee third quarter DMR. Minimum and average values reported under 300I <br />for the third quarter were also in error. After running the calculations, the BODs <br />Removal % for the one month (September) the subject Outfall discharged was 98.69%, <br />using the average influent concentrations for that same month. Attached are two copies <br />of the corrected DMRs for 002A and 300I. These should supercede the previous <br />submittals. <br />I again apologize for not having caught this error during the third Quarter DMR <br />preparation. Thank you for your time. If there are questions, please contact me directly <br />at (970) 870-2750. <br />Sincerely, <br />a ~. ~~ <br />Brian A. Watterson, <br />Environmental Geologist <br />cc: DMG <br />