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COLORADO DEPARTMENT OF PURL/C HEALTH AND ENV/RONMENT, Water Qualip~ Control Division Amendment No. 1 -Rationale -Page 2, Permit No. CO-0044776 III. RECEIVING STREAM • A. Identification, Classification and Standards Idenuf~ation: All outfalls discharge to Deer Trail Ditch, which is unclassified. T/te ditc/t is tributary to the North Fork of the Gunnison River, which is within segment 2 of the North Fork of the Gunnison River Sub-basin ojthe Gunnison and Lower Dolores Rivers Basin. The permittee has submitted written authorizan'on from the ditch owner to discharge into Deer Trail Ditch. !t should 6e noted that this authorization specifies a maximum flow of 11,500 gallons per day. This CDPS permit authorizes flows frorn mul[iple outfalts that total in excess of this amount. Issuance of this CDPS permit is in no way intended to supersede or take precedence over the written agreement between the ditch owner and the permittee. 2. Classifcation: Segment 2 is classified for the following uses: Recreation, Class 1; Aquatic Life, Class 1 (cold); Water Supply; Agriculture. 3. Numeric Standards: The standards which have been assigned in accordance with the above classifications can 6e found in Classifications and Numeric Standards for the Gunnison artd Lower Dolores Rivers Basin {5 CCR 1002-35), as amended April 73, 1998. It should be noted that this facility, at present, does not discharge pollutants from outfall 004 which are limited by water quality standards with the exception of those shown befow. And, latest information available to the Division indicates that the unclassified ditch does not enter the river within a distance of less than five miles. On this basis, there is little, if any, potential for impact front this facility's discharges on the river. Phvsicat and Biological • pH=6.S-9.Os. u. Fecal Colifarm = 200!100 mP B. Receiving Water Data Ouatirv: Quality data for Deer Trail Ditch are unavailable and unnecessary for determination ojefflueat [imitations (please see section VI.A.2. of the rationale for funkier elaboration). 2. Q~tamity. Acute and Chronic Low Flows: Quantity data for Deer Trail Ditch are unnecessary for determinr.~tion of e, ffluent limitations (please see section VI.A.2, of the ratiorale jar further elaboration). IV AMENDMENT DESCRIPTION By letter dated March 4, 1999, the permiaee's consultant requested the addition to the permit of a domestic wastewater treatment facility (WWTF). They had made this request with the initial permit application in 1996, however they had not obtained site approval at that rime, as required by stare regulations. Site approval was granted by the Division on February 18, 1999. Upon this approval, the permit can be amended to add this WWTF. V. WASTEWATER TREATMENT FACILITY DESCRIPTION This domestic WWTF' will serve to treat wastewater from bathrooms and showers at the Bowie No. 2 mine site. Initial flow will be low with final build-out at the mine producing wastewater approaching the approved capacities. Shower • water is expected to be the majority flow to the WWTF. As shown In the site approval, the facility has an approved hydraulic capacity of II,S00 gallons per day (gpd) (0.0173 million gallons per dm (,IIGD)). The approved organic capacity is 25 pounds per day (lb/day) of five-day biochemical oxygen demand (BOD j. Tile permittee had originally sought approval for a hydraulic capacity of !5,000 gpd. However, during the Iota! approval process, the capacity w,as lowered to 11,300 gpd. For this reason. the Division approved the lower capacin~. !t appears from a review of the permittee's engineering report that the jaciliro is capable of treating 13.000 gpd.