Field Office Compliance - Assistance

Assistance ID - 102990
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
9/20/2018 Re: High UF turbidity Inbox x Adams, Mike Wed, Sep 19, 4:28 PM (14 hours ago) to me Thanks Janet. I will send the data tomorrow. JANET GASTINEAU
9/20/2018 From: Gastineau, Janet Date: Wed, Sep 19, 2018 3:53 PM To: Adams, Mike; Cc: Subject:Re: High UF turbidity Report on MOR and for now send me the 15 minute IFE readings for each event so I can evaluate the consecutive nature of these. I have to run for now and am at Rathbun tomorrow but will look at it more carefully Friday. Per usual, formulate a response internally to ensure maintenance can avoid a similar event in the future. JANET GASTINEAU
9/20/2018 Adams, Mike Sep 19, 2018, 3:49 PM (15 hours ago) to me, Kyle, Carter, Jeff Janet, I need to clarify the below email. The turbidity spikes were caused by maintenance staff doing some cleaning near the turbidimeters, not the UF trains. Sorry for the confusion. JANET GASTINEAU
9/20/2018 On Wed, Sep 19, 2018 at 3:33 PM Adams, Mike <[email protected]> wrote: Janet, This afternoon at the Saylorville Water Treatment Plant one of our maintenance personnel was trying to clean the UF piping and caused the turbidity of each UF train to spike. The worker was hosing the piping with finished water. There must have been some unoxidized iron that got through the membranes. The turbidity events were short in duration. UF # 4 did take approximately 18 minutes for the turbidity to return to normal levels. UF train # 2 had a high turbidity reading of 2.25 NTU’s. UF # 4 had a high reading of 0.53 NTU’s. UF’s # 2 and 4 shut down and initiated an MIT. The MIT’s both passed. UF # 2 had an LRV of 4.245 and UF # 4 was 4.054. The turbidity events were short in duration and I don’t anticipate any effect on the finished water turbidity. Let me know if you need more trends or data. JANET GASTINEAU
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