Field Office Compliance - Assistance

Assistance ID - 99471

Des Moines Water Works - 310338211

9966 Maffitt Lake Dr Cumming, IA 50061

Dallas County

FO 5

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Report

Attached Files/Reports

File Name	File Type	File Date	Note

Comments

Date	Comment	Commenter
3/9/2018	Attached please find MOR for February 2018……….. Additionally, be advised of the following: · On February 5th Filter #2 at FDWTP had a 45 minute event of 0.00 ntu due to the IFE being inadvertently being powered off. A report that summarizes this event is attached also. · Logic will be integrated into the FDWTP before month’s end to detect excessively low NTU from an IFE meter and alarm the Operator accordingly. · If questions here, please let me know.	JANET GASTINEAU
3/9/2018	Gastineau, Janet <[email protected]> Feb 6 to Mike, Tom, Mike, Carter, Jennifer, Paul, George, Tony Thanks for the report Mike. Please also send the summary with the February MOR for this WTP to keep my memory jogged. And thank you for the reassurance that you are making changes to the logic to prevent this from happening again. It does not sound like there is any reason to think the filter experienced an excursion while the project was underway and the turbidimeter was off. Please also check the controller settings for loss of communication from the sensor--if setup appropriately, this should have been an indicator/alarm for operators.	JANET GASTINEAU
3/9/2018	From: "McCurnin, Mike" <[email protected]> To: "Gastineau, Janet" <[email protected]>, "Atkinson, Tom" <[email protected]> Cc: "Adams, Mike" <[email protected]>, "Woodruff, Carter" <[email protected]>, "Puffer, Jennifer" <[email protected]>, "Sanford, Paul" <[email protected]>, "Lawrence, George" <[email protected]>, "Knox, Tony" <[email protected]> Bcc: Date: Tue, 6 Feb 2018 16:44:51 +0000 Subject: DMWW Fleur Plant - - Filter #2 (Feb 5 2018) Janet/Tom: A heads up that we lost IFE readings on Filter #2 for near 45 minutes yesterday. See trending below. We are in process of a project to upgrade effluent valve actuators and staff inadvertently turned off power to the unit while working on the adjacent filter. OPERATOR on duty discovered near 45 minutes later (during hourly reads) and immediately closed effluent valve to allow power to be restored to turbidimeter. Yesterday, in error, I thought we could retrieve data from the unit and that the issue was limited to our trending data. I have learned this AM that the turbidimeter was indeed off and no data can be harvested. NTU level heading into this event was near 0.05 NTU. Once filter was placed back on-line, NTU was initially near 0.15 NTU and then trended back down toward 0.07 NTU. We have numerous NTU alarms in our system, but not for low NTU. We will alter our logic to detect unusually low NTU to allow better detection of such events. If additional information or discussions are needed here, please let me know.	JANET GASTINEAU

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