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Central Appalachia WWTF Water Quality Assessment CO-003 conservative pollutants degrade and sometimes aze created within a receiving stream depending on stream conditions. Amore detailed discussion of the technical analysis for these pazameters is provided in the pages that follow. Pollutants Evaluated The following pazameters were identified by the WQCD as pollutants to be evaluated for this facility: • Metals. During assessment ofthe facility, neazby facilities, and receiving stream water quality, no additional parameters were identified as pollutants of concern. Central Appalachia W WTF: The Central Appalachia W WTF is located in the SW 1/4, Section 21, T7S, R102W; latitude 39° 26' 10", longitude 108° 46' 10"; at 3148 Hwy 139 in Garfield County. The current design capacity of the facility is 0.005 MGD (0.0077 cfs). Wastewater treatment is accomplished using non-aerated lagoons. The technical analyses that follow include assessments of the assimilative capacity based on this design capacity. Nearby Sources An assessment of neazby facilities based on EPA's Permit Compliance System (PCS) database found 63 dischazgers in the Garfield County azea. All of the facilities were discharging to another watershed. In addition, several facilities conducted construction-related operations (e.g., sand and gravel or construction dewatering) and thus had no pollutants of concem in common with Central Appalachia Mining, LLCWWTF. The subject facility is listed in Mesa County, even though it is actually in Gazfield County, because the local office address is in Mesa County. As no dischargers dischazge directly or indirectly to the subject tributaries to East Salt Creek, none have the potential for impact and none are summarized 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. Due to the in-stream low flow of zero, the assimilative capacities during times of low flow are not affected by nearby contributions. Therefore, modeling neazby facilities in conjunction with Lodestaz W WTF was not necessary. Metals: Metals occur naturally in rock. Earth disturbances, such as mining operations, expose rock to air and water creating a potential for these elements to be present in elevated concentrations. Using the mass-balance equation provided in the beginning of Section IV, the low flows provided in Section III, the background concentrations contained in Section II, and the in-stream standards for metals shown in Section II, assimilative capacities were calculated. The data used and the resulting calculations of the allowable discharge concentrations, Mz, are set forth in Table A-5 for chronic and acute assimilative capacities. Appendix A Page 7 of 9 Draft