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COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division Rationale - Page 2. Permit No. CO-0036595. III. RECEIVING STREAPI A. Identification, Classification and Standards 1. Identification: Creek, and to an the Upper Arkans 2. Classification: following uses: Agriculture. Discharge is to Magpie Creek, tributary to Newlin unnamed tributary to Newlin Creek, segment 14 of ss River Dasin. This stream segment is classified for the Recreation, Class 2; Aquatic Life, Class 2 (Cold); 3. Numeric Standards: The standards which have been assigned in actor ante wit t e above classifications can be found in 3.2.0, Classifications and Numeric Standards for the Arkansas River Dasin (5 CCR 1002-8). It should be noted [hat this Facility does not discharge pollutants which are limited by water quality standards with the exception of pH. D. Receiving Water Data 1. Stream Low Flow: The flows which will be used to calculate effluent limitations are acute flows, those that occur for one day every three years (lE3), or chronic, those that occur for thirty days every three years (30E3). These floors have been determined by ,, the Water Quality Control Division and are as follows: l Newlin Creek, Magpie Creek: Type Flow Acute (lE3): 0 cfs (0 AfGD) Chronic (30E3): 0 cfs (0 MGD) 2. Impacts on Downstream Water Supplies or Other Receiving Waters: The discharge is not expected to have any impact on downstream users or segments, provided compliance with effluent limitations is achieved. IV. FACILITY DESCRIPTION A. Industry Description The facility is an underground coal mine. Coal is mined at a current rate of 450,000 tons/year, with a maximum possible rate of 500,000 tons/year. Magnesium chloride is used at the site for dust suppression on the roads. Wastewater is generated from mine dewatering, and surface runoff. See the previous Rationale, dated November 23, 1984, for additional details. r... ~::