Correspondence among

' Mike, Thanks for the information. Given these valve issues, would low pressure conditions less than 35 psi, be present in this portion of the system? If low pressure conditions exist, a cross connection or siphon condition where leaks.or breaks are present may be occurring. While longer transmission times may contribute to lower chlorine residual, the presence of coliform bacteria suggests contaminants have entered the system and their regrowth and resurgence could be assisted by the presence of a biofilm, tuberculation on the pipe walls, and/or phosphate coating. . Please continue with your investigation and let us know how the valve repair/replacement goes. Stephen Busch, P.E. Lansing and Jackson District Supervisor Office of Drinking Water and Municipal Assistance MDEQ 517-643-2314

Gentlemen, * ° Attached is a timeline of events that led us to the recent boil water notice. It shows all sampling and results