Correspondence between

Hi Al: ff you need a schematic for the Flint water treatment plant, there’s one included in the August 2015 OEL report posted on City of Flint's website. Sourte = xxxEND_PAGE:deq21_b571_1675_1677_1 FERS: CHLOREE BAW WSTES Li LIFT OoeMATION #8P1D SCREENS PUMP REE HIE Jae: & CATO REGAREOMATION SEF TENS SEUAL @EGIS FILTSSTIRE WEIR FINISHES WATES 2 DAC ONER 12° SANG SHAMEER REGERVOK ep WATER TREATME! FRGCESS Dlés STEN CE EATER TREATS Hope that helps, Andrea Porter Environmental Engineer Ground Water & Orinking Water Branch US. EPA, Region 5 (WG-155} 77 Wi. Jackson Blvd, Chicage, 1 60604 Phone: 342-886-4427 Fepu 312-697-2656

xxxEND_PAGE:deq21_b571_1675_1677_2 I think MI DEQ has been hit hard this week with public inquiries, congressional inquiries, etc., so | have not heard back

Jennifer; Thank you $0 much! Would you happen to know Hf any other repart has, or that you might have sornewhere, a currently-valid process schematic for the entire set of treatments done at the Flint plant? it would be helpful to have a better picture of where things like softening, tyne of coagulant and GAC fit inte the picture. There are several potential interrelationshins that would affect the successfulness of the phosphate treatrnent pronosed and dosage, and the instability cause by the mafor chemistry change fram Detroit finisned water (which |undarstand was from their Lake Huron-fed plant}. ~ Mike

April 2015 MOR is not on the website. xxxEND_PAGE:deq16_b5_0892_4900_4007 ONIdvINd HILVWM GAHSINIa VINOMINY SNOUGAHNY SUFILLAS FLW Ted NOLWINIIO TS FOVLS aadHL YIWA 10d Gi¥ NOLL INDO TS YAWATOd GV LNVINDVOD AGHMOTHS Jiddss HIOAUTSAY YZLVM GAHSINID SLVATNSIa HEUuGOS SNIMO'THS NISV@ ONINFLAOS NOIMLOZANISIC AN HSV VGOS | YaWATOd FGIXO WHITWO NOILYNOZO | ONIdiNNd HSVMMOVE YSLVMAIV HLIM NOMVaL Td WIGAN TWN NOILVNOGYVoFd 3IXOID NOgavo SNFFdIS YALYM AAVe YaLM MV IILVAIFHIS SSAIOUd INV Id ANFWLVINL YILVM GaSOd0dd INIT# 40 ALIS xxxEND_PAGE:deq16_b5_0892_4900_4008