Field Office Compliance - Assistance

Assistance ID - 76614
Des Moines Water Works - 310338211
9966 Maffitt Lake Dr Cumming, IA 50061
Dallas County

FO 5

Report
File Name File Type File Date Note
Comments
2/24/2015 From: Gastineau, Janet [DNR] Sent: Tuesday, February 24, 2015 4:14 PM To: 'McCurnin, Mike' Subject: RE: DMWW - FD Filters on 2/19/2015 Looks like worse case it’s a monitoring violation, but I won’t carry the message forward until you know if the data is able to be retrieved and how many sequential 15 minute reads were missed in that gap--2 or 3, I assume depending on cycle. Also let me know if there is usually some kind of back up to these faults and/or if it’s preventable in the future, etc. From: McCurnin, Mike [mailto:[email protected]] Sent: Friday, February 20, 2015 4:25 PM To: Gastineau, Janet [DNR] Cc: Water Production Supervisors Subject: DMWW - FD Filters on 2/19/2015 Janet: Last night we experienced a “faulted” smart logic controller w/in our Fleur Drive Filter Building. That particular controller is responsible for gathering all of our IFE (individual filter effluent) turbidity information. ON-CALL personnel were dispatched immediately to restore controller functionality. Presently we have a gap in data from approximately 9:15 PM until 9:51 PM for all filters that were on-line (11 filters were ON, 4 filters were OFF, and 1 filter was in FLOW TEST). A quick summary of things to pass along at this time: • A review of all turbidities before and after the gap has been completed. o There is a lone filter (Filter #6) that had excess turbidity (2.53 NTU) at the back end of the event. o All other units either had acceptably-low NTU (well below 0.5 ntu) or were off-line. o Filter #6 had just started a flow test (inlet valve closed and effluent valve open) at the onset of the fault and by the time the fault was restored the filter had been drained. There is some confidence (yet it cannot be confirmed presently) that the high NTU was a function of loss of flow to the turbidimeter. o There was no discernible impact on CFE as a result of this event. • Additional efforts will be made next week to extract raw data from the IFE units themselves. This data, if retrievable, will allow us to describe a more thorough picture of all IFE during the fault event. Any advice or direction from you or others at DNR here would be appreciated. Michael J. McCurnin, P.E. | Director of Water Production Des Moines Water Works | WATER YOU CAN TRUST FOR LIFE 2201 George Flagg Parkway | Des Moines, Iowa 50321 | www.dmww.com Phone: (515) 283-8709 | fax: (515) 283-8757 | e-mail: [email protected] JANET GASTINEAU
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