Operational Evaluation Level Stage 2 D/DBP Rule Compliance
description
Transcript of Operational Evaluation Level Stage 2 D/DBP Rule Compliance
![Page 1: Operational Evaluation Level Stage 2 D/DBP Rule Compliance](https://reader034.fdocuments.net/reader034/viewer/2022051118/56816522550346895dd7a487/html5/thumbnails/1.jpg)
Operational Evaluation Level Stage 2 D/DBP
Rule Compliance
Michael W. DealCompliance Assurance SectionCentral OfficeDivision of Drinking And Ground Waters
![Page 2: Operational Evaluation Level Stage 2 D/DBP Rule Compliance](https://reader034.fdocuments.net/reader034/viewer/2022051118/56816522550346895dd7a487/html5/thumbnails/2.jpg)
Overview• Ohio Administrative Code• Goals of OEL• Calculation• OEL Exceedance• OEL Form 5031• Take Home
![Page 3: Operational Evaluation Level Stage 2 D/DBP Rule Compliance](https://reader034.fdocuments.net/reader034/viewer/2022051118/56816522550346895dd7a487/html5/thumbnails/3.jpg)
Ohio Administrative Code • OAC 3745-81-24 (D) (21)• OEL calculated for DBPs at all monitoring
locations• Exceedance of the MCL requires a report• OEL report due 90 days following
notification• Publicly accessible upon request
![Page 4: Operational Evaluation Level Stage 2 D/DBP Rule Compliance](https://reader034.fdocuments.net/reader034/viewer/2022051118/56816522550346895dd7a487/html5/thumbnails/4.jpg)
Goals• Primary: to help prevent an MCL through
advanced warning of increased DBP Locational Running Annual Averages (LRAA) for quarterly monitoring
• Secondary: to cause PWSs to address locations or facilities with seasonal DBP issues
![Page 5: Operational Evaluation Level Stage 2 D/DBP Rule Compliance](https://reader034.fdocuments.net/reader034/viewer/2022051118/56816522550346895dd7a487/html5/thumbnails/5.jpg)
Calculation of OEL
( A + B + (2∗C ¿¿ ¿𝟒 =𝐃
A = TTHM or HAA5 result for the quarter before the previous quarterB = TTHM or HAA5 result for the previous quarterC = TTHM or HAA5 result for current quarterD = Current Operational Evaluation Level Value
![Page 6: Operational Evaluation Level Stage 2 D/DBP Rule Compliance](https://reader034.fdocuments.net/reader034/viewer/2022051118/56816522550346895dd7a487/html5/thumbnails/6.jpg)
ExampleLocation “X” (DS201)
TTHM Results
Current Quarter Value (3rd Qtr 2013) ……………………...(114.0 µg/L) 2Previous Quarter Value (2rd Qtr 2013)……………….....…….61.3 µg/LQuarter Before Previous (1st Qtr 2013)….............………..45.1 µg/L
334.4 µg/L 4
OEL = 83.6 µg/L
83.6 > MCL of 80.0 µg/L for TTHMResult is an OEL Exceedance
![Page 7: Operational Evaluation Level Stage 2 D/DBP Rule Compliance](https://reader034.fdocuments.net/reader034/viewer/2022051118/56816522550346895dd7a487/html5/thumbnails/7.jpg)
OEL Exceedance
• Early warning • Not a violation• No public notice requirement• Can be at 1 or more monitoring
location(s)• TTHM or HAA5
![Page 8: Operational Evaluation Level Stage 2 D/DBP Rule Compliance](https://reader034.fdocuments.net/reader034/viewer/2022051118/56816522550346895dd7a487/html5/thumbnails/8.jpg)
Following an Exceedance
1. Receive call from OEPA to determine scope
2. Receive letter from OEPA with report template
3. Complete OEL report (Form 5031)
![Page 9: Operational Evaluation Level Stage 2 D/DBP Rule Compliance](https://reader034.fdocuments.net/reader034/viewer/2022051118/56816522550346895dd7a487/html5/thumbnails/9.jpg)
45 Total 84%3rd Quarter
62%Purchased SW
6 Repeat
18 13
29
3
OEL Exceedances (Since Aug. 2012)
![Page 10: Operational Evaluation Level Stage 2 D/DBP Rule Compliance](https://reader034.fdocuments.net/reader034/viewer/2022051118/56816522550346895dd7a487/html5/thumbnails/10.jpg)
Limited Scope
• Limited scope OEL report if cause is known
• High DBP levels result from a certain change in water quality, treatment or distribution
![Page 11: Operational Evaluation Level Stage 2 D/DBP Rule Compliance](https://reader034.fdocuments.net/reader034/viewer/2022051118/56816522550346895dd7a487/html5/thumbnails/11.jpg)
What’s the Point?• Begin dealing with DBP
issues prior to NOV• Investigate areas of
concern • Make adjustments to
lower DBP levels• Document investigation
on Form 5031
![Page 12: Operational Evaluation Level Stage 2 D/DBP Rule Compliance](https://reader034.fdocuments.net/reader034/viewer/2022051118/56816522550346895dd7a487/html5/thumbnails/12.jpg)
OEL Form 5031
![Page 13: Operational Evaluation Level Stage 2 D/DBP Rule Compliance](https://reader034.fdocuments.net/reader034/viewer/2022051118/56816522550346895dd7a487/html5/thumbnails/13.jpg)
Section 1 – Source Water and Treatment
![Page 14: Operational Evaluation Level Stage 2 D/DBP Rule Compliance](https://reader034.fdocuments.net/reader034/viewer/2022051118/56816522550346895dd7a487/html5/thumbnails/14.jpg)
Noteworthy Changes to Source Water: Significant algal blooms Uncharacteristic precipitation events Alternative well usage Distinctive change to purchased water
Changes to Treatment: Chemical feed increase or decrease Chemical product changes
Section 1 – Source Water and Treatment
![Page 15: Operational Evaluation Level Stage 2 D/DBP Rule Compliance](https://reader034.fdocuments.net/reader034/viewer/2022051118/56816522550346895dd7a487/html5/thumbnails/15.jpg)
Section 2 – Distribution System Operations
![Page 16: Operational Evaluation Level Stage 2 D/DBP Rule Compliance](https://reader034.fdocuments.net/reader034/viewer/2022051118/56816522550346895dd7a487/html5/thumbnails/16.jpg)
Section 2 – Distribution System OperationsNoteworthy Events or Changes to the Distribution System:
Hydrant flushing Line breaks Rerouted flow Significant demands
![Page 17: Operational Evaluation Level Stage 2 D/DBP Rule Compliance](https://reader034.fdocuments.net/reader034/viewer/2022051118/56816522550346895dd7a487/html5/thumbnails/17.jpg)
Section 3 – Storage Tank Operations
![Page 18: Operational Evaluation Level Stage 2 D/DBP Rule Compliance](https://reader034.fdocuments.net/reader034/viewer/2022051118/56816522550346895dd7a487/html5/thumbnails/18.jpg)
Section 3 – Storage Tank Operations
Calculate Percent Daily Fluctuation The difference between the high and
low water levels for each drain/fill event
X 100%
![Page 19: Operational Evaluation Level Stage 2 D/DBP Rule Compliance](https://reader034.fdocuments.net/reader034/viewer/2022051118/56816522550346895dd7a487/html5/thumbnails/19.jpg)
Section 4 – Chlorine Residual Monitoring
![Page 20: Operational Evaluation Level Stage 2 D/DBP Rule Compliance](https://reader034.fdocuments.net/reader034/viewer/2022051118/56816522550346895dd7a487/html5/thumbnails/20.jpg)
Section 4 – Chlorine Residual Monitoring
Disinfectant residual information; Average residual can be found on your MOR Number of distribution samples includes daily
samples and samples collected with TC Number of samples <0.2 mg/L for free or <1.0
mg/L for combined chlorine Repeated for each month of the quarter
![Page 21: Operational Evaluation Level Stage 2 D/DBP Rule Compliance](https://reader034.fdocuments.net/reader034/viewer/2022051118/56816522550346895dd7a487/html5/thumbnails/21.jpg)
Section 5 – Additional Information
![Page 22: Operational Evaluation Level Stage 2 D/DBP Rule Compliance](https://reader034.fdocuments.net/reader034/viewer/2022051118/56816522550346895dd7a487/html5/thumbnails/22.jpg)
Section 5 – Additional Information
Additional monitoring information Plans to comply with the MCL Corrective actions taken from past OEL
exceedances
![Page 23: Operational Evaluation Level Stage 2 D/DBP Rule Compliance](https://reader034.fdocuments.net/reader034/viewer/2022051118/56816522550346895dd7a487/html5/thumbnails/23.jpg)
Take Home• Early warning not a violation• OEPA will notify of an exceedance• Report covers treatment, storage and
distribution• Failure to submit a report is a violation• Goal is to optimize control of DBPs and
avoid MCL exceedances
![Page 24: Operational Evaluation Level Stage 2 D/DBP Rule Compliance](https://reader034.fdocuments.net/reader034/viewer/2022051118/56816522550346895dd7a487/html5/thumbnails/24.jpg)
More Information• www.epa.ohio.gov/ddagw• www.epa.gov/safewater/disinfection/stage2
![Page 25: Operational Evaluation Level Stage 2 D/DBP Rule Compliance](https://reader034.fdocuments.net/reader034/viewer/2022051118/56816522550346895dd7a487/html5/thumbnails/25.jpg)
Questions