Correspondence among

The information on drinking water systems contained in these messages and attachments appear accurate and complete with the possible exception of the Flint intake in the Flint River. itis an intake for a standby water treatment plant that wil serve over 100,000 residents should it be placed in service. Although it is standby, we do expect the city to maintain both the intake and treatment plant in operating condition in case the DWSD pipeline should suffer a catastrophic failure. 1 don't know if that circumstance elevates Flint to your list of systems to be assessed but | thought | would mention it.

Jim and Bob, | believe | received responses from all of our districts (| copied Rich Benzie in case he has some knowledge about the answers to your second question). YWWIPs serving populations greater than 100,000 people: Lansing WWTP Flint WWTP Genesee Co-Ragnone WWTP (Montrose) Kalamazoo WWTP Detroit WWTP Warren WWTP e Wayne CO Downriver WWTP e YCUA WWTP (Ypsilanti Community Utilities Authority) VWVTPs greater than 2 MGD within 5 river miles of a water intake serving a population of 100,000 or more (our staff had problems understanding the question, so we may need more work on this}. | started by looking at the Drinking water systems serving population greater than 100,000 in the attached spreadsheet: e Ann Arbor - ??, we'll need to look at this one again. e Grand Rapids - this is a Lake Michigan intake (if memory serves me), so is the question relevant? e Lansing source is from the groundwater, so they don't have a river intake e Kalamazoo source is from the groundwater, so they don't have a river intake 1 xxxEND_PAGE:deq12_b179_0745_0749_1 e Saginaw/Midland - this is a Lake Huron/Saginaw Bay intake, so is the question relevant? e Detroit - we believe all of DWSD's intakes are more than 5 miles downstream of WWTPs > 2 mgd. We're still waiting to hear about one intake, but it appears to be OK. See attached note. Is that the information you needed? Do we need to look at Grand Rapids and Saginaw/Midland in WW ITP impacts since they are lake intakes? -Pete Peter Ostlund Field Operations Section Chief Water Resources Division Michigan Dept. of Natural Resources & Environment P.O. Box 30458, Lansing, Michigan 48909-7958 517-373-1982 [email protected]