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4 <br /> evaluation (median of 6.7),within the 45 40 9 range required by'ANSI/NSF Standard 40. The pH data for the <br /> evaluation are shown in Appendix C. <br /> 3.5 Temperature <br /> Influent temperatures over the evaluation period ranged.from..13 to.23°.0 (median,of 200C). Aeration <br /> chamber temperatures ranged from 16 to 22°C:(median of 20°C) The temperature data are shown in <br /> Appendix C. <br /> 3.6 Dissolved Oxygen <br /> Dissolved oxygen (DO) was measured in the aeration chamber and effluent during.the evaluation. The <br /> :aeration chamber DO ranged between 1.2 and 9.2 mglL(median of 4.4 mg/L),while the effluent DO ranged <br /> between 1.0 and 6.9 mglL (median of 4.6 mg/L). All dissolved'oxygen data are shown in"Appendix C. <br /> 3.7 Color, Threshold Odor,'Cily Film, Foam <br /> Three samples of the effluent were analyzed for color, odot, oily film and foam as prescribed in NSF <br /> Standard 40. The effluent was acceptable according to the requirements in NSF Standard 40, with color: <br /> less than 15 units, non-offensive threshold odor, no visible evidence'of oVi fiTm-and no foam. <br /> 3.8 Noise <br /> A reading of the noise level at a distance of 20feet from the plant was'taken while the plant was in <br /> operation, using a hand-held decibel meter. The reading was below the 60 dbA required under ANSI/NSF <br /> Standard 40. <br /> 4.0 REFERENCES <br /> 1. "Environmental Protection Agency Guidelines for Secondary Treatment"; Federal Register,Volume 28,, <br /> No. 159, 1973, <br /> 2. Grady, Jr., C.P., and H.C. Lim, Biological Wastewater Treatment- Theory and Annlihations, Marcel <br /> Dekker Publishers, New York, 1980. <br /> 3. APHA,AWWA,WPCF, Standard Methods for the Examination of Water and Wastewa CIL 17th Edition. <br /> American Public HealthAssociat`ion, Washington, D.C. <br /> 4. U.S. EPA, Methods for Chemical Analysis of Water and Wastes, U.S. Environmental Protection Agency, <br /> Washington, D.C. <br /> 981.1ti1201. 6(1 This repo4.may not be reproduced In whole or in part° F5je 16 of 49 <br /> Final Report wittwut tlis expresmod written consent of NSF lntematlonal,^ April 2000 <br />