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COLORADO DEPARTMENT OF PUb..tC HEALTH AND ENVIRONMENT, IVarer Qa~lity Control Division Rationale -Page 2, Permit Na. CO-0036684 • 2. Classification: T)ris stream segment is classified for tJte jollowing uses: Recreation, Class 1; Aquatic Lije, Class 1 (cold); Agriculture. 3. Numeric Standards: The complete list ojstandards which have been assigned in accordance tvirh the above classification can 6e found in Classifications and Numeric Standards jot the Upper Colorado River Basin 3.3.0 (S CCR 1002-8), as amended December Il, 1995. The following numeric standards which have been assigned in accordance with the above classifications will be used to develop effluent limitations. Physical and Bioloeical pH=6.5-9.Os.u. Metals Criteria Standard Analytical Method Iron (Fe) Chronic 1000 ug/P Total Recoverable B. Receiving Water Data «alin~: Quality data jot the Fish CreeA are available from the permittee's sampling records of station 27A, located upstream of the Ttvenrymile Coal Company discharge. A summary aj the quality data jot the period from April, 1991, through September, 1994, is shown in Table H/-1. Table I/I-! - Quality of Receiving {Voter Parameter No. Samples Afean Iron, ug/P 17 2222 • 2. Ortnnrrrv Acute and Chronic Law Flox~s: The flows which will be used to calculate acute and chronic effluent limitations are the one day in three year [ow flow (/E3) and the 30 day in three year low flow (30E3) respectively. Those flatus have been determined jar Fish Creek by the Water Quality Control Division, and are as follows (a11 flows in cubic feet per second): Table //I-2 -- Acute acrd Chronic Low Flows Acute Chronit Anmtal 0.! 0.25 II'. FAC/LlTY DESCRIPT/ON A. Industry Description Tvae of/ndrrstrv: The facility is an inactive coal [oadout facility. When active, the loadour will include crushing facilities. Coal is stocAyiled on site to 6e loaded on rail cars. No timetable was given by the permittee far reactivation. 2. Sources to the Treatment Plant: Surface runoff from the tipple area and spoils spring water flow to the pond. 3. Chemicals Used: The permittee did not specify any chemicals for use in waters that may be discharged. On this basis, no chemicals are approved under this permit. Prior to use ojany applicable chemical, the permittee must • submit a request for approval which includes the most current Material Sajery Data Sheet (MSDS) jar that chemical. Urtri! approved, use aj any chemical in waters that may be discharged is a violation of this permit.