Correspondence among

Date: Wednesday, December 09, 2015 2:47:17 PM FYI. Flint’s additional corrosion control inhibitor feed is now up and running. As a reminder this is on top of the corrosion inhibitor already present in the water purchased from DWSD. Stephen Busch, P.E. MDEQ Lansing District Coordinator Office of Drinking Water and Municipal Assistance Lansing and Jackson District Supervisor 517-643-2314 [email protected]

Revised. SHe the note on page two regarding stagnation times greater than 24 hours. i would orefar to use L& hours, fut the EPA notes recommended 24 hours sol went with that. Please int rne know if you have any other comments. Jirn ~ f think this can be shared with EPA aven if staff have further comments.

Updated lead and copper sampling instructions for residents/customers. We have modified our instructions to address concerns raised. We have not vetted this through any district staff to see if they have any other recommendations. This could be done concurrently with EPA’s review. xxxEND_PAGE:deq15_b768_2732_2732_1

FYi- revised version. I'm meeting at 2pm with Kory, Michelle and Jennifer,

The attached came off of the Mass. page. Blood levels in children are not significantly impacted by lead levels in water that are 15 ppb or lower xxxEND_PAGE:deq20_b10_223_431_019 presented a risk for bottle-fed infants. The lead studies discussed above exclusively assessed lead in water, and tap water was the only source considered as the cause of the increased BLL. One landmark U.S. observational study conducted during the 1990s studied 183 urban children aged 12-31 months (37%, 12-18 months; 31%, 18-24 months; 33%, 24-31 months) (57). Of these children, 63% had BLLs <10 g/dL, 20% had BLLs of 10-14 yig/dL, 8% had BLLs of 15-19 pg/dL, and 3% had BLLs >20 g/dL. The study evaluated lead in home foundation perimeter soils, potable water, paint, and house dust. Lead-contaminated house dust was the major contributor to BLLs 210 ug/dL. However, the study reported that although lead-contaminated water had a statistically significant effect on children's BLLs after adjusting for other sources of lead exposure, no statistically significant contribution for drinking water could be discerned at levels below the current EPA action level of 15 ppb (57). Lead dust as a primary source of lead for children with increased BLLs was further demonstrated in a subsequent pooled analysis of 12 studies; floor dust lead levels as low as 5 ug/ft2 were associated with 5% of enrolled children having a BLL >10 ug/dL (58). xxxEND_PAGE:deq20_b10_223_431_020

For Friday.

Date: Thursday, October 01, 2015 5:47:39 PM For Friday.

Dat ‘Thursday, October 01, 2015 3:42:21 PM FYI.

Dat “Thursday, October 01, 2015 3:42:22 PM FYI.

FYI.