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~ ~ CYPRUS ~ Orchard Valley January 27, 1994 Colorado Departrneltt of Health W,~D-PE-B2 4300 Q~erry Creek Drive South Denver, Colorado 80222-1530 Cyprus Orchard Valley Mine P.O. Box t299 Paonia, CO 87428 Phone: 303-5271135 Fax: 303-527.223a RE: NPDES DISL'-IAF2GE PERMI'T' NO. CO-003685, FCxJf1IH QUAK?'FR 1993 DISCHP.RGE MUISI'IURII9G RE~KIS Tb Whom It May Concz*~n: Please find enclosed seven completed D["R forms addressing the fou-`~h quarter of 1993 for NPDES Permit No. CO-0033685. Three (3) effluent limitation exceedences • are reported for the quarter. 1WO (2) dischasye points addressed under Permit No. CO-0033685 experience3 discharge during the fourth ~n,arrer of 1993. Point 001, consisting of effluent from a domestic waste~Hater treatment facility, discharged continuously throughout the quarter. Points 002, 003, 004, and 005 did not experience discharges during the qua_-'per. Point 006 discharged from November 17 through November 22 throuc~ a siphon installed cn the pond outlet and was sailed one (1) time during this period. 1hi-`y day average values reported on the enclose3 D~Il2's represent the maximum thirty day average values gene-ated for the quazte_r. All three effluent limitation exceederices reported for the quarter involved the disrhaL'~e from point 001. The BOD minimum percent removal criteria (850) was not met in October duri?;tg the quarter. EOD percent removal doamwstted during Oc`,.ober, November, and December was 76~, 98%, and 86; respectively. COVCC attributes the October results to lc,<+ initial loadings and a faulty blaaer in the wastewater treatment plant which was repaired in November. Effluent BOD values docwnented for each month were well below permit limitations at 23.1, <1, and 6.2 m3/1 respectively. The 30-day and maximum 7-day geometric averages for fecal coliform were exceeded during October at outfall 001 due to a malfunction with the plant's chlorinator unit. The chlorinator malfunctioned on October 24th or 25th. A damaged pump was removed during the week of the 25th, repaired, and reinstalled on November 5, 1993. On October 27, the October monthly water satg3le was obtained from the • plant. The November monthly water sample was riot collected until November 30 and therefore could not be used to reduce the 30 day geometric average reported. Coliform levels durirtg November and December were well within permit limitations.