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COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT, Water Quality Ca+trol Division Amerulment No. l -Rationale -Page 4, Permit No. CO-0044776 2. Discussion of Effluent Limitations • a) Requlation~or EfRtrent Limitations: The Regulations jot Effluent Limitations (5 CCR 1002-62, Regulation No. 62), apply ro the conventional pollutants. For this facility, the limitations jot BOUs and Taal Suspended Solids are based on this regulation. These limitations will +feterntine compliance with state secondary treatment standards. Additionally, ti+e lin+itntions for Total Residtrnl Chlorine, pH and Oil artd Grense are based at [his regulation in the absence of any applicable water quality standards. b) Applicable Federal Effluent Guidelines and Standards: No federal effl+renr guidelines apply to this domestic WW'TF. c) Fecal Coliform: Tl:is facititv's jtnal discharge goes to an unclassified ditch Utat does no! enter tf:e Nord: Fork of the Gunnison River or otter state waters within five miles. Therefore, in the absence of applicable fecal colijornt standards, the fecal colijorm [imitations are based on tl:e Division's fecal colifonn policy. The policy specifies limitations of 6,000!12,000 colonies per 100 mPof effluent (30-day geometric mean/7- day geometric mean, respectively). d) Total Ammonia: As stated elsewhere, the discharge goes to an unclassified ditch. There are no water quality standards for ammonia shat apply to this discharge. For this reason, neither ammonia limitations nor monitoring are required for this discharge. e) Antidegradation: Since the receiving water is unclassified, an antidegradation review is nor required pursuant to section 31.8(1) of The Basic Standards and Methodologies for Surface Water. f) Salinity Regulations: /n compliance with the Colorado River Salinity Standards and the Colorado Disch~ Permit System Regulations the permittee is required to monitor effluent jot total dissolved solids on a quarterly basis. Please see Part 1.8.2. of the permit for additional requirements. g) Whole Effluent Toxicity (WET! Testing: WET testing is not a req+rirentent at outfa[1 004. WET requirements apply to permittees that discharge to surface waters of the state. The Bozvie Resources, Ltd. domestic wastewater treatment facility discharges to Deer Trail Ditch, which is not a state water. As stated previously in this rationale, because of the long distance from the discharge point to the point where Deer Trail Ditch flows into the North Fork of the Gunnison River, this discharge is not expected to impact state waters. B. Monitoring Influent and F,Qluent Monitoring: Influent and effluent monitoring will be required as shown in Table VI-2. Refer to dte permit for the location of the monitoring points. Division monitoring policy specifies that when a jaclliry has detention of less than 24 hours, composite sampling is required for BODs, TSS and total ammonia. During the site application process, the state geologist recommended thnt influent and effluent flow recording occur to indicate if any x•astewater is lost within the WWII' and to reduce the potential for failure of rite sloping ground on which the WWTF is located. The site approval makes this a requirement unless the perminee can provide another acceptable means of monitoring for Leakage. If the permiuee seeks to use an alternative to influent and effluent flow recorders for this demonstration, a description of the alternative should be submirned to the Division for consideration during the public comment period jot amendment number 1. Otherwise, be[h flow recorders will become required under this permit. Part I.E.S. of the permit requires installation of an effluent flow measuring device within ninety days after the permit becomes effective along with a demonstration that 10% accuracy of readings is aaained, so the flow recorder requirements would become effective ninety dms after nntersdment number 1 becomes effective. A compliance schedule ~+ilt be indtrded in the permit for. installation of the influent flow rnenstering device within the same time periozf.