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primary TSS effluent limit and claim the alternate effluent limit for Settleable Solids (SS) instead. The <br />analytical results for SS indicated <0.1 mUUhr which is well below the 0.5 ml/Uhr requirement. <br />Outfall 012 - Pond B <br />The pond discharge valve was opened on 12/21/2010 at 0800 hrs and outflow sampled at 0900 hrs. The <br />valve was closed 12/23/2010 at 1500 hrs. The manually operated headgate valve was opened to insure <br />necessary capacity and stability of the pond during the extreme inflow event. <br />The data indicates a TSS of 180 mg/l, which would exceed the primary 35 mg/130-day average <br />requirement and the daily maximum requirement of 70 mg/l. However, since the discharge is a result of <br />rainfall induced inflow it is appropriate to waive the primary TSS effluent limit and claim the alternate <br />effluent limit for Settleable Solids (SS) instead. The analytical results for SS indicated <0.1 ml/l/hr which <br />is well below the 0.5 ml/Uhr requirement. <br />The data indicates a Total Iron of 4,200 ug/1 which meets the 6,000 ug/l primary daily limit but exceeds <br />the 3,000 ug/130 day average primary limit. This sample was the only sample taken during the month. <br />Due to the storm event inflow it is appropriate that the Total Iron limit be waived under the alternate <br />Permit Effluent Limit. <br />Outfall 016 - Pond D <br />The pond outfall is a passive treatment discharge point with a riser pipe serving as the primary discharge <br />point. The pond was sampled on 12/21/2010 at 0945 hrs. <br />The data indicates a TSS of 64 mg/l, which exceeds the primary 35 mg/l 30-day average requirement but <br />not the daily maximum requirement of 70 mg/l. However, since the discharge is a direct result of rainfall <br />induced inflow it is appropriate to waive the primary TSS effluent limit and claim the alternate effluent <br />limit for Settleable Solids (SS) instead. The analytical results for SS indicated <0.1 ml/l/hr which is well <br />below the 0.5 ml/l/hr requirement. <br />Please see the attached analytical results for additional information. The data indicates that none of the <br />discharge requirements were exceeded as Oxbow was able to meet the applicable primary or alternate <br />effluent limits. Overall, Oxbow is pleased that the ponds functioned as designed and in accordance with <br />the approved CDRMS designs and the CDPS Permit. <br />No other issues were encountered during December, 2010. If you have any questions or comments, <br />please contact me at (970) 929-5806. <br />Sincerely, <br />es A. Kiger <br />Environmental Manager <br />Attachments <br />Xc: Mr. Mike Bouley, CDRMS <br />Jim Cooper, OMLLC <br />Files <br />0 Page 2