2019 AWOP National Meeting Office of Ground Water and Drinking Water

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Presentation transcript:

2019 AWOP National Meeting Office of Ground Water and Drinking Water Standards and Risk Management Division Technical Support Center August 7, 2019

Drinking Water Methods: Evaluation and Approval Recently Approved Methods – pH, online chlorine analysis and turbidity

Drinking Water Methods Methods are approved through a Regulation (Rule) or the Expedited Method Approval Process Many methods developed at EPA or other government agencies Some developed by vendors – e.g., Hach, Tintometer, Swan (turbidity) Standards organizations - ASTM, Standard Methods EPA Drinking Water Alternate Test Procedure (ATP) Program – Evaluates new or modified test methods to determine if method is “equally effective” in performance relative to methods already approved in regulations Regional Update

EPA Drinking Water ATP Program ATP program evaluates modified or new testing methods Accepted submissions are methods, not technologies Methods must undergo sufficient validation to support their use at the national level (multi-lab validation/multi-DW matrices). Must demonstrate method robustness through method performance data and meeting QC acceptance criteria Single laboratory or Regional approvals apply to wastewater methods, not drinking water methods ATP program does not have authority to approve alternate testing procedures Regional Update

Expedited Method Approval Process http://www. epa Alternate methods approved through a Federal Register Notice Once published in the FR, methods are fully U.S. EPA approved for regulatory compliance monitoring Time required for approval significantly shortened Notice-and-comment rulemaking: 2-3 years following method evaluation Expedited process: < 1 year Expedited methods are in Appendix A to Subpart C of 40 CFR Part 141. State adoption of alternative test methods is optional; however, if these methods are used, laboratory certification requirements extend to the use of methods approved through the expedited process

Expedited Method Approval Process http://www. epa Frequency of approvals Publishing FR notices on approximately an annual basis Expedited Method Approvals could include: Methods evaluated through the EPA Drinking Water ATP program; Standard Methods and ASTM methods; and New or revised EPA methods Regional Update

Where can I find Approved Methods? Approved methods are listed on OGWDW’s web site. http://www.epa.gov/dwanalyticalmethods/approved-drinking-water- analytical-methods Tables of approved methods Grouped by regulation/monitoring requirement, sorted by contaminant Regional Update

Method Focus: pH Approved regulatory methods: EPA Method 150.1 (stand alone) and EPA Method 150.2 (continuous monitoring) Published in 1983 Do not address newer sensor technologies available for pH determination Lack guidance on calibration frequency and verification Regional Update

Method Focus: pH EPA Method 150.3: Single method addresses stand alone and continuous pH monitoring Describes calibration, calibration frequency and verification, and acceptance criteria Addresses direct (pH reference buffers) and indirect (grab sample comparison) calibration for continuous monitoring systems Provides guidance to assist operators in dealing with potential issues (e.g. effect of temperature on pH measurements Approved for compliance monitoring in July 2017 Regional Update

Method Focus: Online Free/Total Chlorine EPA Method 334.0: Surface Water Treatment Rule (141.74(a)(2)) allowed the use of continuous monitoring without providing guidance EPA Method 334.0 establishes performance QC criteria for on-line analyzers On-line analyzers may be calibrated using aqueous standards or against grab sample measurements Weekly on-line analyzer calibration verification against grab sample measurement 14-day initial demonstration of capability to confirm analyzer/grab sample agreement before using analyzer for compliance Approved for compliance monitoring in November 2009 Regional Update

Method Focus: Turbidity Turbidity is a method-defined parameter: Not a specific chemical that is measured, but a physical parameter EPA Method 180.1 established design specifications, quality control and calibration requirements for turbidity measurement by nephelometry Primary standard (formazin) used for calibration Secondary standard used for routine daily calibration checks Light sources EPA Method 180.1 set specifications for tungsten lamps Newer methods use LED or laser-based light sources Regional Update

Method Focus: Turbidity Turbidity methods approved since 2009: Laser-based nephelometry Mitchell M5271, Hach Method 10258 (360o Nephelometry), Tintometer Lovibond 6000 LED-based nephelometry Mitchell M5331, Swan AMI Turbiwell, Thermo AQ4500, Tintometer Lovibond 1000, Tintometer Lovibond 2000 Revised Hach 8195, Rev. 3.0 (tungsten/LED) & 10258 (Laser 360o) Previously – sealed standards could only be used as secondary calibration verification checks. Quarterly preparation of liquid standards were required Hach conducted long-term stability studies using sealed StabilCal for calib. The two revised methods were approved in October 2018, allowing the use of prefilled sealed StabilCal vials as primary calibration standards Regional Update

Questions?