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COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division Rationale - Page 2. Permit No. CO-0040827. ITI. RECEIVING STREAM:' A. Identification, Classification and Standards 1. Identification: Discharges 001, 002, 003 and 004 are to Munger Creek and unnamed tributaries to Munger Creek, which are tributary to East Salt Creek. Discharges 005, 007 and 008 are to East Salt Creek, which is tributary to the Colorado River. All receiving waters are included in segment 13 of the Lower Colorado River Basin. 2. Classification: This stream segment is classified for the following uses: Recreation, Class 2; Aquatic Life, Class 2 (Warm); Agriculture. 3. Numeric Standards: The standards which have been assigned in accordance with the above classifications can be found in 3.7.0, Classifications and Numeric Standards for the Lower Colorado River Basin (5 CCR 1002-8). It should be noted that this facility does not discharge pollutants which are limited by water quality standards with the exception of pH. B. 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 flows have been determined by the Water Quality Control Division and are as follows: East Salt Creek, Munger Creek, unnamed tributaries: Type Flow Acute (lE3): 0 cfs Chronic (30E3): 0 cfs 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. The mine is not currently operating, with no immediate plans for operation. When at full operation, the production rate will be up to 2.8 million tons of coal per year. Startup will be based on market conditions. The facility is covered under federal regulation 40 CFR 434.45, the Coal Mining Point Source Category. There are no changes at the facility from the previous permit.