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i <br /> 3.4 pH <br /> Over the entire evaluation period, the influent pH ranged from 6.5 to 7.6 (median of 7.0). The effluent pH <br /> ranged from 6.0 to 7.2 during the evaluation (median of 6.4), within the 6 to 9 range required by ANSI/NSF <br /> Standard 40. The pH data for the evaluation are shown in Appendix C. <br /> 3.5 Temperature <br /> S <br /> Influent temperatures over the. evaluation period ranged from 13 to 20°C (median of 170C). The <br /> temperature data are shown in Appendix C. <br /> 3.6 Color, Threshold Odor, Oily Film, Foam <br /> Three samples of the effluent were analyzed for color,odor, oily film and foam as prescribed in NSF Standard <br /> ' 40. The effluent was acceptable according to the:requirements in NSF Standard 40, with color less than 15 <br /> units, non-offensive threshold odor, no visible evidence of oily film and no foam. <br /> ii <br /> I 3.7 Noise ll, <br /> A reading of the noise level at a distance of 20 feet from the plant was taken while the plant was in operation, j <br /> using a hand-held decibel meter. The reading Was below the 60 dbA required by ANSI/NSF Standard 40. <br /> E <br />+: 3.8 Turbidity Analyses <br /> 3 <br /> Although not required by Standard 40, Orenco; Systems Inc., requested that effluent samples from the <br /> AdvanTex AX20N be analyzed for turbidity. Turbidity analyses were completed following method 2130B of <br /> Standard Methods. The turbidity measurements ranged between 2.0 NTU and 7.8 NTU (median of 3.6 NTU). <br /> All turbidity data are shown in Appendix C. In addition, graphs showing a comparison of effluent turbidity to <br /> TSS and CBOD values are included in Appendix D. <br /> i <br /> l <br /> .J r. <br /> 4.0 REFERENCES <br /> 111 "Environmental Protection Agency Guidelines for Secondary Treatment", Federal Register, Volume 28, <br /> No. 159, 1973. <br /> I <br /> 2.i APHA, AWWA, WPCF, Standard Methods for the Examination of Water and Wastewater, 20th Edition, <br /> American Public Health Association, Washington, D.C. <br /> J. <br /> .11 <br /> 3.1, U.S. EPA, Methods for Chemical Analysis of Water and Wastes, U.S. Environmental Protection Agency, <br /> Washington, D.C. <br /> l 01111120151060 This report may not be reproduced in whole or in part Page 15 of 46 <br />�. Final Report without the expressed written consent of NSF International. April 2002 <br />