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COLORADO DEPARTMENT OF PC/BLIC HEALTH AND ENVIRONMEM, Water Quality Control Division Rationale -Page 2, Permit No. CO-0044776 G. CMLRB Permit Na.: Applied for IIL RECEIVING STREAM A. Identifcation, Classifuation and Standards Identification: Discharges to Deer Trail Ditch, which is unclassified. The ditch is tributary to the Nonh Font: of the Gunnison River, which is within segment 2 of the North Fork of the Gunnison River Sub-basin c f the Gunnison and Lower Dolores Rivers Basin. The point of discharge is approximately one mile from the confluence between the ditch and the North Fork of the Gunnison River. The permittee has submitted written authorization from the ditch owner to discharge into Deer Trail Ditch. It should be noted that this authorization specifies a maximum flow of 11,500 gallons per day. This CDPS permit authorizes flows in excess of this amount. Issuance of this permit is in na way intended to supersede or take precedence over the written agreement between the ditch owner and the permittee. 2. C(assi cation: Segment 2 rs classified for the following uses: Recreation, Class I; Aquatic l.tfe, Class I (cold); Water Supply; Agriculture. 3. Numeric Standards: The standards which have been assigned in accordance with the above classifications can be found in Classiftcations and Numeric Standards for the Gunnison and Lower Dolores Rivers Basin (5 CCR 1002-35), as amended April I3, 1998. It should be noted that thrs facility, at present, does not discharge pollutants which are limited by water quality standards with the exception of those shown below. Additional parameters will be evaluated at such time as the permittee requests an amendment to incorporate the domesti,: WArI'F. PJrysical and Biological pH = 6.5 - 9.0 s. u. Fecal Coliform = 2000/100 ml B. Receiving Water Data Metals Iron (Total Recoverable) = 1000 ug/1 Quality: Quality data for Deer Trail Ditch are unavailable. Quality data are available for the Nonh Fork oJ' the Gunnison River. CDPHE station 000152, located approximately 1.5 miles west of Somerset, CO, . upstrecvn of the point where the Deer Trail Ditch enters the river, are available for the period from 10/95 through 8/9f. A total of 19 samples were analyzed for total recoverable iron. The results varied from 0.045 to 7.7 mg/l, the mean of these results was 1.699 mg/l. This value will be rounded to 1.7 mg/1 for use in calculating potential water quality-based effluent limitations. • • 2. OuantiN. Acute and Chronic Low Flows: The flows which will be used to calculate acute and chronic effluent limitations are the one day in three year low flow (IE3) and the 30 day in three year low flow (30E3) respectively. Those flows have been determined for Deer Trail Ditch and the Nonh Fork of the Gunnison River by the Water Quality Control Division, and are as follows (al! flows in cubic feet per second): Table III-1 -Low Flows -Deer Trail Ditc/t Aeute Chronic Annual 0 0 Table III-2 -Low Flows -North Fork ojthe Gunnison River Acute Chronic • Annual 26 36