Field Office Compliance - Assistance

Assistance ID - 97279
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
11/13/2017 Gastineau, Janet <[email protected]> 8:23 AM (48 minutes ago) to Mike, William Mike, Bill called me about this on Friday and I agree the turbidity spike can be attributed to the pump change, but can you provide us with some additional information with the the November MOR submission, at the latest. IFE quality at the time of the spikes. Alarm effectiveness and operator response at control center and locally (including grab sample data that may have been collected). Protocol for switching pumps. Plans for confirming sample line integrity in the future so this doesn't happen each time the sample pump is changed. How will you determine what daily highest value to report for CFE for November 9, 2017? Submit the 15 minute data (not graph as seen here) for CFE for November 9, 2017. Confirm flow rate through the sampler was between 200 – 750 mL/min. JANET GASTINEAU
11/11/2017 On Friday, November 10, 2017 at 9:54 AM I received a call from Mike McCurnin with Des Moines Water Works Operations. He called to report a situation that occurred at the Maffit Water Works the previous day (11/9/17) at 9:00 AM. They have two pumps that send finished water to the finished water instruments (instruments that measure parameters such as turbidity). They switched pumps at 9:00 AM and almost instantly turbidity went from 0.03 to over 4 for about one minute and then remained above 1 for another minute before returning to normal readings. Mike believed this was due to residual water in the pumping system (for the alternate pump) that caused the spike in turbidity and was not representative of water quality in the clear well. Mike sent a copy of the trend analysis via email that showed normal readings prior to 9:00 AM, the 2 minute spike and readings returning to normal after 2 minutes. I told Mike this was not a violation or something that would require a public notice and that we would be contacting him the following week to discuss the matter further to see if there was a way to prevent the spike in turbidity readings such as pumping the residual water to waste before sending it through the instruments or some other procedure or process that could be implemented. BILL GIBBONS
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