Correspondence between

Warren, Below is our communication to EPA concerning the phosphate dosage following their initial comments. EPA concurs with the PO4 dosage based upon the incoming concentration to Flint. Michael Prysby, P.E. District Engineer Office of Drinking Water and Municipal Assistance '517 290-8817

Here is the current agenda that I have assembled for our Wednesday night forum. I am looking for everyone to speak for about 10 minutes at the opening and then we will move to written questions. Ihave attempted to highlight each persons area of expertise as it relates to initial comments and I will moderate through the questions. We do not plan to have an open microphone. Starting time is 7:00 in the Dome, I will be available in City Hall for those that arrive early. Thank you all for participating, Howard Croft Public Works Director City of Flint 1101 S. Saginaw Street Flint, MI 48502 PH# 810.766.7346 Ext.2043 xxxEND_PAGE:deq21_b488_1368_1369_2

Mike As you know, the Flint Water Plant (FWP) currently uses 2400V as primary power throughout the facility. All of the power feeders in the plant site are 5kV rated and it appears the existing switchgear is also rated at SkV. Most of the major electrical improvements installed during Phase | were dual voltage (2400/4160) equipment in anticipation of the plant power being changed to 4160V in the future. However, this voltage conversion is not needed for the phase of work. The current sub-station has two 2.5 MVA transformers running in parallel for a total capacity 5 MVA. These old transformers are not equipped with cooling fans. Based on the evaluation performed during the Phase II study, which was completed in 2003, the full connected load to these transformers is estimated to be 6.97 MVA while the estimated power load at 36-mgd is 4.22 MVA. Based on these estimates there is sufficient power for the plant with both sub- station transformers in service. Even though the transformers are owned by Consumers Energy, it could take weeks to replace one of these main transformers in the event of a unit failure, which will result in reduced treatment and _ pumping capacity. The sub-station switchgear was installed in 1960 and is antiquated and difficult to maintain. Since the 2003 study, Flint’s maximum day water demand has decreased to approximately 20-mgd, which has correspondingly reduced the estimated power load. At this time it is believed that two 2.0 to 2.5 MW transformers will be required to power the FWP to meet maximum day demand and one transformer will meet average day demand under emergency conditions. We are proposing to construct a new substation with two — 2.0 to 2.5 MW pad mounted transformers, along with substation switch gear, interconnected with one 2.0 to 2.5 MW intermittent duty diesel generator as shown below. This arrangement will allow the generator to backup either transformer to cover maximum day demands should one of the transformers or transformer feeds drop off line and to provide sufficient generation capacity to meet average day demands. xxxEND_PAGE:deq27_b342_1954_1963_09 fg ns Lecco Andro _ _” DESIGN NOTES AND. COMPUTATIONS A LEO A AVEDA DALY COMPAR COMPANY ~ ° SUBIECT: FLINT WATEL TREATHENT SHEET NO. Loo | co ELECTRICAL SEXVECE: THPROVEHENTS em CONSOMER SS: Wet dedicite N. DokT Hw &-SouTH SovT# Facds sac~ & E. Staalerd -} ~ 9) BAck-UP ‘e wee TRANSMISSION Y % SERVICE PE, Y — aad Dasr ie om | _ “CENTER CONSUMES EXEsG? . iiss, Gxty oF FLINT, m1 : 2ge0f Solon ain) 3500 KVA FANS aes skV FUTURE. “SIE oon 2S00KW/BISKVA SHE sky — ot @ 7° sod seeeetiel eN ANTEGEP ATED. toap” =o ~ AVE DAY (YNGD)- 3300KVA "ts fae Dat CHHGD)- GOOOKMA CONNECTED ~7Joookwf WITH ForvRE FILTER, ) TRANSFER, POMP STATEON aaa | gg coh pnooé ! PANT FEEDEKC. (SovTH SEkvrce) ~~ oa _ ce ee be eg ee (30-[070l- Of pncsaneey DEAN EY Hotter: nlybo13 _. coor Don Richards om pe] y bie «lg he? ro °° -? . D-005. ; xxxEND_PAGE:deq27_b342_1954_1963_10