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Cotter Corporation Water Quality Assessment CO-0036251 For non-conservative parameters and ammonia, the mass-balance equation is not as applicable and thus other approaches are considered where appropriate. Note that conservative pollutants are pollutants that are modeled as if mass is conserved and there is no degradation, whereas non- conservativepollutants degrade and sometimes are created within a receiving stream depending on stream conditions. Amore detailed discussion of the technical analysis for these parameters is provided in the pages that follow. Pollutants of Concern The following pazameters were identified by the WQCD as pollutants of concern for this facility: • Radium 226 and 228 • Uranium • Zinc. During assessment of the facility, nearby facilities, and receiving stream water quality, no additional parameters were identified as pollutants of concern. Cotter Corporation: The Cotter Corporation Outfa11001 discharges to an unnamed tributary to East Paradox Creek. Outfall 002 is located at 38 degrees, 14 minutes, 39 seconds latitude and 108 degrees, 45 minutes, 07 seconds. Outfall 002 discharges to an unnamed tributary to Bul] Canyon. Outfa11002 is located at 38 degrees, 12 minutes, 47 seconds latitude and 108 degrees, 47 minutes, 36 seconds. Both outfalls are located m Montrose County. The current desrgn capacity of Outfall 001 _ is 120 gpm (0.27) cfs). The current design capacity of Outfall 002 is 190 gpm (0.42 cfs). Wastewater treatment is accomplished using chemical coagulation and precipitation. The technical analyses that follow include assessments of the assimilative capacitybased on this design capacity. Nearby Sources An assessment ofneazby facilities based on EPA's Permit Compliance System (PCS) database found 24 dischazgers in the Montrose County azea. More than two-thirds of the facilities were discharging to another watershed..The remaining seven facilities were located more than twenty miles from the Cotter Corporation and thus were not considered. Based on available information, there is no indication that non-point sources were a significant source of pollutants of concern. Thus, non-point sources were not considered in this assessment. Radium 226, Radium 228, and Total Uranium: According to The Basic Standards and Methodologies of Surface YYater, Section 31.11 establishes basic standards applicable to all waters of the state, including the unnamed tributaries to East Pazadox Creek and Bull Canyon. Because the low flow of these streams is zero, the assimilative capacity equals the standazds as follows: • Uranium shall not exceed 40 pCi/1 • Radium 226 and 228 shall not exceed 5 pCi/1 Appendix A Page 11 of 13 Final