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<br />including Spill Prevention, Control, and Countermeasure Plans, Stormwater <br />• Permits, and Stormwater Management Plans, will be developed, as appropriate, for <br />the processing facilities area to minimize discharges to adjacent surface water <br />drainages. <br />A portion of the surface runoff from the 6.5-acre Piceance Site processing facility area <br />will be diverted to a 14-acre evaporation pond located nearby on the plateau (see <br />Figure 2-3 and Figure 2-4). The remaining runoff will be handled according to <br />management practices identified in Stormwater Permits and Stormwater <br />Management Plans (see Section 5.2). Approximately 16 gpm of other liquid wastes <br />from the processing facilities will also be stored in the evaporation pond (Kvaerner <br />1998f). The pond will be lined to prevent seepage. Adequate freeboard has been <br />provided in the design of the evaporation pond to allow for expected surface runoff <br />from the processing plant area plus the other liquid processing wastes, as well as <br />direct precipitation. Because of its location on a plateau, no other surface runoff will <br />enter the evaporation pond, and there is virtually no potential for overtopping of <br />the dam or consequent discharge to surface waters. <br />American Soda is currently authorized to discharge minimal wastewater from its <br />exploration and experimental test mine activities to a dry, ephemeral drainage near <br />the east end of the existing cooling/retention ponds. This discharge point may <br />continue to be used for minor wastewater discharges such as from the experimental <br />test phase water treatment facilities. Any future discharges from this location are <br />expected to be minimal in volume and within the parameters of the existing CDPHE <br />permit standards for water quality. Other than limited Stormwater runoff from the <br />site, no new discharge of wastewater to surface waters is expected from the <br />commercial mine or processing facilities. <br />The two existing cooling/retention ponds are designed to divert runoff water from <br />the surrounding drainages around the ponds. The ponds have been designed to <br />accommodate the 100-year precipitation event with no effect. Because the ponds <br />would only be used under emergency or unusual circumstances to temporarily store <br />production fluids drained from well field piping, and because the ponds are <br />designed to accommodate the 100-year precipitation event, no impacts to surface <br />waters are anticipated. <br />Similarly, due to its siting on a plateau, the 14-acre evaporation pond associated <br />with the Piceance Site processing facilities will not be subject to surface runoff other <br />than that intentionally diverted to it from the processing facility area. The <br />evaporation pond will also be designed to accommodate the 100-year precipitation <br />event. Thus, use of the evaporation pond is not expected to result in any impacts to <br />surface waters. <br />A pipeline breach is unlikely but could result in contamination of surface waters if <br />• a breach occurred in or near a stream. As mentioned above, a total of six crossings of <br />perennial streams would occur along the pipeline corridor: two under Piceance <br />Amencan Soda. L.L.P. 8_(3 <br />Commeraal Mine Plan <br />August 16, 1998 <br />