Field Office Compliance - Assistance

Assistance ID - 136203

Des Moines Water Works - 310338211

9966 Maffitt Lake Dr Cumming, IA 50061

Dallas County

FO 5

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File Name	File Type	File Date	Note

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Date	Comment	Commenter
11/12/2025	Casey, Nathan 2:41?PM (3 minutes ago) to me That’s an easy change. We’ll have it on the November MOR.	JANET GASTINEAU
11/12/2025	Re: SWTP MOR 10-2025 Gastineau, Janet <[email protected]> 2:25?PM (12 minutes ago) to Nathan Yes, that would be preferred. I did run through them in the first place to see if increasing decimals would change anything. Adding that extra decimal from now on starting with the November 2025 MOR should do the trick. Thanks for looking into it. On Wed, Nov 12, 2025 at 2:23?PM Casey, Nathan <[email protected]> wrote: We think this is right. Looking at the trend its stable between 0.025 and 0.034. We can add a third decimal point to the CFE in the future. The third decimal place shows some variation. We’ve had this problem in the past at Saylorville. After the UF’s the turbidity is so stable we don’t have much variation. That may be why we do three decimal places for the UF samples. Let me know if you have any questions or comments. Thank you, Nathan From: Gastineau, Janet <[email protected]> Sent: Wednesday, November 12, 2025 1:22 PM To: Casey, Nathan <[email protected]> Subject: SWTP MOR 10-2025 Just double checking--every highest CFE was 0.03 NTU. Please confirm.	JANET GASTINEAU

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