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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, 2211 <br /> Edition, 2012 (hereinafter referred to as Standard Methods) <br /> 2. ANSI/AWS D.1.1/D1.1 M:2010, Structural Welding Code — Steel and ANSI/AWS D1.3/D1.3M:2008, <br /> Structural Welding Code— Sheet Steel, 5th Edition, with Errata <br /> 3. NFPA 70®: National Electrical Code® (NEC®), 2015 <br /> 4. NSF/ANSI 40, Residential Wastewater Treatment Systems <br /> 5. 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 20 of 64 <br /> Final Nitrogen Report without the expressed written consent of NSF International June 2019 <br />