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<br /> <br />002574 <br /> <br />2. Site in Steamboat Springs using extended aeration in lagoons and <br />advanced wastewater treatment. <br /> <br />3. Midway regional site using extended aeration in lagoons and advanced <br />biological treatment. <br /> <br />4. Midway regional site using mixed advanced wastewater treatment; <br /> <br />The physical location of the facilities involved in alternatives 1 and 2 would <br />be in the vicinity of the existing main wastewater-treatment plant at <br />Steamboat Springs. The proposed location of the facilities involved in <br />alternatives 3 and 4 is approximately 2 mi (3.2 km) downstream from the <br />existing treatment plant at Steamboat Springs and 0.25 mi (0.40 km) upstream <br />from the Steamboat-II development. Alternatives 1 and 3 would involve <br />complete year-round plant treatment; whe~eas, alternatives 2 and 4 would <br />involve land treatment during the summer months and biological treatment in <br />the winter months. This report will consider only alternative 1. Land <br />treatment, incorporated in alternatives 2 and 4, could produce nonpoint-source <br />runoff, which this study framework has no means to evaluate. Alternative 3 <br />would result in virtually the same analysis as alternative 1 displaced by the <br />distance between the proposed locations. The suggested standards for certain <br />constituents in the effluent to be discha~ged from the proposed' wastewater~ <br />treatment plant (U.S. Environmental Protection Agency, 1977) would be upgraded <br />with time, as indicated in table 5. These proposed limitations on the concen- <br />trations of constituents in'the effluent were considered in the analysis and <br />will be discussed later in this report. Because the suggested standards for <br />1978 and 1983 are the same, only one simulation for 1978 was done in the <br />analysis. The results presented also apply to 1983. <br /> <br />Table 5.--Suggested effluent standards for proposed <br />regional wastewater-treatment plant <br /> <br />[U.S. Environmental Protection Agency, 1977; <br />units are in milligrams per liter] <br /> <br />Year <br /> <br />Constituent <br /> <br />1978 <br /> <br />1983 <br /> <br />1985 <br /> <br />BOD (5-day)-------- <br />Total N------------ <br />Ammonia Nl--------- <br /> <br />10----------------- <br /> <br />10----------------- <br /> <br />2.8 (September)--- <br />9.0 (Oecember)---- <br /> <br />9.0--------------- <br /> <br />6.0--------------- <br /> <br />10----------------- <br /> <br />10----------------- <br /> <br />2.8 (September)--- <br /><9.0 (Oecember)---- <br /> <br />9.0--------------- <br /> <br />6.0--------------- <br /> <br />5.0 <br />5.0 <br />1.0 <br />1.0 <br /><4.5 <br />6.0 <br /> <br />Nitrate------------ <br /> <br />00----------------- <br /> <br />lAllowable stream loading (1978 and 1983) of ammonia nitrogen varies over <br />yearly cycle. Two values are shown for 2 months used in the modeling analysis. <br /> <br />39 <br />