AWWA COMMENT PERIOD ON THE REVISIONS TO AWWA C671 – Online Turbidimeter Operation and Maintenance February 12, 2021 AWWA solicits public comments on all proposed new AWWA Standards, and on all proposed revisions, reaffirmations, or withdrawals of existing AWWA Standards. The referenced standards project is being considered for approval and the publication of this notice begins the 45-day public comment period for AWWA and ANSI. An electronic public review copy of the proposed standard can be obtained for review during the comment period by emailing ETS Support . Comments must be submitted in writing to the AWWA contact listed below no later than the last day of the comment period specified herein. Such comments shall be specific to the section(s) of the standard under review and include sufficient detail so as to enable the reader to understand the commenter's position, concerns and suggested alternative language, if appropriate. AWWA Comment Period closes on March 29, 2021. Send comments to: Liz Ralph 303.347.6177 phone 303.795.7603 fax The review copy will be edited for publication and may also be revised as appropriate based on any comments received during the public comment period. Therefore, this copy is not suitable for continued utilization and is intended only for comment purposes. Final publication of the standard may take several months. When it is available, a notice will be published in the official notice section of Journal - American Water Works Association . The standard becomes an effective AWWA standard on the first day of the month following such publication in Journal - American Water Works Association . SCOPE This standard describes online turbidimeter operation and maintenance (O&M) for online turbidimeters used in the treatment and monitoring of potable water, reclaimed water, or wastewater effluent. MAJOR REVISIONS Major revisions made to the standard in this edition include the following: 1. Updated Sec. 2 References. 2. Under Sec. 3 added in definitions for accuracy, laser turbidimeter, precision, potable water, ratio turbidimeter, ratio turbidity, reclaimed water, stray light, wastewater, and wastewater effluent. Revised the definitions for LED, mNTU, and nephelometer. Deleted the definition for FNU. 3. Revised Sec. 4.1, Item 7, including deleting the definitions for FNU and SSU since these are already defined in Sec. 3. 4. In Sec. 126.96.36.199 Instrument settings, deleted the 2nd paragraph and replaced with a new Sec. 188.8.131.52 on turbidity measurement. 5. Added a new Sec. 184.108.40.206 Measurement to provide more detail on turbidity measurement. 6. In Sec. 4.3.1 Continuous sample streams, added in additional information on rotameters. 7. In Sec. 220.127.116.11 Verification standards, added in a sentence for guidance to follow manufacturer’s instructions for calibration and verification. 8. Revised Sec. 18.104.22.168 Verification procedures, to provide clarity on the use of a secondary device.