Field Office Compliance - Assistance

Assistance ID - 99148

Mason City Water Reclamation Facility - 310635546

2950 SOUTH BIRCH DR Mason City, IA 50401

Cerro Gordo County

FO 2

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Date	Comment	Commenter
2/22/2018	From: Barb Wood <[email protected]> Date: Wed, Feb 21, 2018 at 11:04 AM Subject: BOD contamination of distlled water. To: "[email protected]" <[email protected]>, david Miller <[email protected]> Cc: "William P. Stangler" <[email protected]> We have contamination in the distilled water that we currently purchase. The samples for 2-16-17 were estimated on the law of averages for BODs and CBODs and then I added the contamination factor to the final D.O. readings, the results are higher than normal but not out. The blank buffer water was also adjusted by the contamination factor. We are running blank distilled water samples and finding them positive for bacteria. We are doing everything to resolve this issue. The Feb 14th and 15th samples were discarded because of contamination, so no results for those days. Barbara Wood	DAVID MILLER

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