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3.4 pH <br /> Over the entire evaluation period, the influent pH ranged from 6.4 to 8.2 (median of 7.1). The effluent pH <br /> ranged from 6.0 to 6.8 during the evaluation (median of 6.4); within the 6 to 9 range required by NSF/ANSI <br /> Standard 40. The pH data for the evaluation are shown in Appendix C. <br /> 3.5 Temperature <br /> Influent temperatures over the evaluation period ranged from 7 to 22°C(median of 18°C). The temperature <br /> data are shown in Appendix C. <br /> 3.6 Dissolved Oxygen <br /> Dissolved Oxygen (DO) was measured in the effluent during the evaluation. The effluent DO ranged <br /> between 0.2 and 9.6 mg/L (median of 2.9 mg/L). All dissolved oxygen data are shown in Appendix C. <br /> 3.7 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 <br /> Standard 40. The effluent was acceptable according to the requirements in NSF Standard 40,with color less <br /> than 15 units, non-offensive threshold odor, no visible evidence of oily film and no foam. <br /> 3.8 Noise <br /> A reading of the noise level at a distance of 20 feet from the plant was taken while the plant was in operation, <br /> using a hand-held decibel meter. The reading was below the 60 dbA required by ANSI/NSF Standard 40. <br /> 3.9 Alkalinity <br /> Over the entire evaluation period, the influent alkalinity ranged from 120 to 410 (average of 200). ; this is <br /> within the average greater than 175 mg/L as CaCO3 required by NSF/ANSI Standard 40 <br /> 4.0 REFERENCES <br /> 1. American Public Health Association (APHA), American Water Works Association (AWWA)&Water <br /> Environment Federation (WEF): Standard Methods for the Examination of Water and Wastewater, 22nd <br /> Edition, 2012 (hereinafter referred to as Standard Methods. <br /> 2. ANSI/AWS D.1.101.1 M:2010, Structural Welding Code—Steel and ANSI/AWS D1.301.31VI:2008, <br /> Structural Welding Code— Sheet Steel, 5th Edition, with Errata <br /> 3. NFPA 70®: National Electrical Code® (NEC®), 20115 <br /> 4. US EPA, Code of Federal Regulations (CFR), Title 40: Protection of Environment, 2012. <br /> 15/10/055/0030 This report may not be reproduced in whole or in part Page 16 of 59 <br /> Final Report without the expressed written consent of NSF International January 2019 <br />