Document kDognJozxbj20wROjrEb2eg9b

Message From: Grether, Heidi (DEQ) [GretherH@michigan.gov] Sent: 9/20/2017 9:13:15 PM To: Wagner, Kenneth [/o=ExchangeLabs/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=048236ab99bc4d5eal6cl39blb67719c-Wagner, Ken] CC: O'Brien, Timothy (DEQ) [OBrienT3@michigan.gov]; Grether, Heidi (DEQ) [GretherH@michigan.gov]; preston.cory@epa.gov Subject: Background - Wayne County S02 SIP Issue Attachments: S02 SIP - EPA background.docx Ken - I am writing to thank you for the time we recently spent discussing the Michigan DEQ's work on the Wayne County S 02 SIP. Attached please find a brief summary of the issue, which you can share with staff. As I indicated, I raise this issue with you as a matter of EPA policy and practice, with the understanding that all EPA Regions do not implement the `weight of evidence' provisions consistently. I look forward to discussing this in more detail with you and your staff at a convenient time. Again, thanks for taking the time to talk with me and I look forward to our next visit. Kind regards, H&CcU/ C. Heidi Grether Director Michigan Department of Environmental Quality Sierra Club v. EPA 18cv3472 NDCA Tier 10 ED 002061 00178139-00001