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Cyprus Orchard Valley Mine- ~~~~ P. O. Bo: 1299 Paonia. GO 81 d2B • S~ Phone: J03-527-a 135 orchard Valley Faz: J03527.22Ja O-tober 28, 1997 Colorado Department of Health F7t"~C}-PE-B2 4300 Q~erry Creek Drive South Denver, Colorado 80222-1530 RE: NPDES DISCHPRGE PER~IIT NO. N-0033685. THIRD OITAF2I'Eit 1443 DZSCIARGE MONITORING REi'0}7I`S To k7~om It May Concern: Please find enclosed seven completed CMR forms addressing the third quar`,.er of 1993 for NPDES Per-~it No. CC-0033685. Three (3) effluent limitations we=e exc~x3ed during the quarter. • TWO (2) discharge points addra~Ge3 under Permit No. CD-0033685 experienca3 discharge during the second quarter of 1993. Point 001, consisting of effluent from a domestic wastewater treatment facility, discharge3 continuously throughout the quarter. Points 002, 003, 004, and 005 did not experience discharges during the quarter. Point 006 discharged from August 9 through September 1 through a siphon system instilled on the pond outlet and was sarpled three (10) times duri~ this period. Thirty day average values reported on the enclosed D`II2's repr_sent the maximum thirty day average values generated for the quarter. One effluent limitation exceeded durirq the rnlarrer involved the discharge from point 001. The BOD minimum percent removal criteria (85%) was not met during the quarter. EOD percent remov-al docwnerteol during July, August, and September was 59%, 74%, and 55% respectively. COVCC attributes these results to low initial loadings and a faulty blower in the waste•.rater treatment plant which continues to malfunction. Efforts to repair this blower are o~oirg. Effluent BOD values doa.-nented for each nonth were well below permit limitations. TWo effluent limitations exceeded during the quarter involved the discharge from point 006. T5S thirty day average and daily maximLml values were exceeded. On August 9, a siphon dischaz~e from this sediment pond was initiated. 'IY~e daily maxiznun TSS value reported is 102 n9/1 and occlured on August 9. The next sampling occ~uzed August 11 with TSS on this date dwn to 68 mg/1. All sutser7uent samples were well below the TSS daily maximnml limit of 7o n9/1. The thirty day average TSS value is reported as 38.8 ag/1 inclusive of the first • sampli~. The average value excluding this number is 31.8 mg/1 inclicatirg that dise'~arges from August 11 on were in cmlgJliance with the T5S permit limitations.