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COLORADO DEPARTMENT OF HEAL7H, Water Quality Control Division Rationale, Amendment No. I -Page 3 Permit No. CO-0032I15 V. DISCUSSION OF AMENDMENT.• (Continued) Thus, based upon these previously described considerations, the Division hat determined that WET testing still must be continued for both species at both ourfal(s (002 and 006). However, the Division hru aGa ntod~ed the requirements for outfalLr 002 and 006 by changing the monitoring frequency jar acute WET testing froth a quarterly to an annual frequency. Based upon the resulu oj[he continued annual WET testing, the Division could at a later tithe reevaluate (in response to an amendment request from the permitteeJ these results to determine ij continued WET testing is still appropriate for discharge paints 002 and 006. For the other outfalls which have WET testing requirements in this permit (003, 005, 009, and OII J, the regular requirement for quarterly acute WET testing with the two species is still applicable, since WET testing data jot these outfalls have not been submitted yet. The decision for a reduced WET testing frequency jot outfnllc 002 and 006 is also bared upon a review b}• the Division that the water quality of these two discharges hac Geen conslaen[ and not widely variable, nnrl drat no c/temicals have been used for treatment which could result in toxicity to organismc. lfany new chemicrrlc are to be used at this jaciliry, the permittee must notes the Division prior to use. If chemicals are added, or ijthe wmer quality should change, then the Division would need to reevaluate the uu~nitoring frequency jar WET resting ar outjallr 002 and 006. Page Ih has been accordingly revised in this nntend~nent jar autjrr[lc 002 turd 006. 77tir change i.c indicared br nc~ added paragraphs notated by the * s}'nd~ol. Since this amendment includes n significant change, public natice requirements are applicable. It should be noted that the Health Department has ma ved m u new location, and thus the mailing nddrecc hat mnv been changed. Instead of the address indicated on page If of the permit, discharge monitoring reports should be .cent to the WQCD at the following address: Colorado Department of Health Water Quality Contra[ Division WQCD-PE-B2 4300 Cherry Creek Drive South Denver, Colorado 80222-1530 Anention: Pernuts and Enforcement The new genera! phone number for the Pernutc and Enforcemnu Section of the Wnrer QurrGty Cnnrrn! Divi.aian i.. now: (303)+692-3590. Don Holmes March 8, 1993