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COLORADO DEPARTMENT OF HEALTH, Water Quality Cantral Division Rnrionn(e -Page 13. Permit No. CO-0038024 A0508 Materials Contairunent Plan -Update 05899 Stormwater Management Plan Submittal and Implementation I.E.1. 90 days after effective date I.E.2.d)ii) .May 31, 1994 A7199 Stormwater Management Plan I.E.2)g) First Report is due Annual Reyoru February IS. 1995 Jon C Subic November 29, 1993 VII. PUBLIC NOTICE COAfMENTs The permittee commented: Outfall 027, previously authorized and couinued in this renewal, has not been rnnstructed and wiR not be constructed The perntittee requesu elirttiruttion of this outfall from the pmnit. The outfaG will be dropped The permittee requested approval of a chemical, United 657 Zyme-Flow. The Division reviewed the Material Safety Data Sheet (MSDS) and rclatcd data. The summary of this review has been added to section lV.A.3. of this rationale. The perntittee had comments regarding whole efJlttent toxicity (WET) testing requiranents. The requirements in this permit arc standard requiremenu applied under existing Division policy. Four outfalls -004, 023, 024 and 026 -are subject to WET. Outfalls 004 and 026 are a considerable distance from the White River and outfalls 023 and 024 are each at least 1 /2 milt from the White River, thus, it is appropriate to use the low flow of Zero for the immediate receiving waters for these jour outfalls in determining the instream waste concentration. The permittee requested that areas under CO Division ojMinerals and Geology jurisdiction be eliminated from storntwnter requirements. The Division has no authority to exempt such areas. All areas must 6e controlled through a Stormwater Management Plan (SWMPJ unless already regulated through effluent limitations. The permittee questioned the change in reporting frequency from quarterly to monthly. The facility has multiple discharge points, some with sign flcant flow volumes. Therefore, to 6e consistent with other similar facilities, this change in reporting is necessary. Other comments did not result in changes to the permit. These will also be clamed via lever to the permittee. Jon C. Kubic February 16, 1994 VIII. REFERENCES Colorado Dept. of Health, Water Quality Control Commission. Basic Standards and Methodoloeies for Surface Water (3.1.0). Denver: CDH, as revised 10/17/91. B. Colorado Dept. ojHcalrh, Water Quality Control Commission. Reeulations for EfRuent Limitations (10.1.0). Denver: CDH, as revised 12/14/89. C. Colorado Dept. of Health, Water Quality Control Commission. Reeulations (or the State Discharee Permit S~~stem (6.1.0). Denver: CDH, as revised 2/2/93. D. U. S. Government, Office of the Federal Register, National Archives and Records Administration. Code of Federal Reeulations (Part 434). Washington: 1990.