Correspondence between

Senator and Representatives; Attached are 1) The way in which we determined that 65% of the water usage (not including sewer) is cooking, drinking and bathing. 2) Applying that stat to the aggregate costs of water in Flint, how we came up with $30M for credits Dick xxxEND_PAGE:treasury01_b38_6783_6976_089 Household Water Use Distribution Rates There appear to be a number of online resources (including online calculators) that indicate the distribution of water used for cooking, drinking, and bathing. A good example is the pie chart in this EPA document: Flushing the toilet and washing clothes, alone, make up about 48% of the average indoor use. Add in leaks, and you're at 62%. Also, keep in mind that this is only indoor use, so any outdoor use would further dilute the percentage used in cooking, drinking, and bathing. So on this scale cooking, drinking, and bathing range from 38% to 52%. So reimbursing for 65% of total water used (not sewer costs) should cover almost anyone's cost for those items. Another way to check this is using a fairly detailed calculator ) to map consumption. Here are the stats that we entered, which are aimed at generating an atypically high ratio of refundable uses to other uses: Single person Relatively modern dishwasher, washing machine, toilet 1 toilet 7 showers/wk (avg is 4.7) 1 bath per week 4 flushes/day (avg is 5) No aerators and old faucets Energy star dishwasher used 0.7 times/week (that’s the avg. per person, though a single person is likely to run the dishwasher at least once, and probably twice, per week—I’m assuming hand washing would use even more water) 2 loads of laundry/week {avg is 11 loads/month) No apparent leaks No outside water use With all of that, the combined faucet*, shower, and bath percentage was 70% of household usage. If we only change the shower and toilet figure to reflect average use, that percentage goes down to 65%. If we plug in a 4-person household that uses the dishwasher, washing machine, toilet, and shower the average number of times, and | also allow for 2 baths per week, keeping all of the other parameters the same, the percentage goes down to 64%. *It’s important to note, however, that in all of these calculations we are using “faucet” as a proxy for cooking and drinking. The default faucet statistic allows for 8.1 minutes of use per person per day. That’s much more water than would be used for those two purposes. If we change that one stat to allow for a total of 8 minutes of water use per day for drinking and cooking, the above percentage plummets to 50%. And if we don’t count the water we waste while waiting for it to heat up (this is a toggle that is in addition to the 8 minutes noted above), the percentage drops to 48%. If we assume that the home doesn’t have a washing machine at this point (and that laundry is done at a laundromat), the percentage use for faucet, shower, and bath is 64%. That’s a fair amount of detail, but the point is that even with all of the variables at play, we think that a 65% refund would cover the cost of water used for drinking, cooking, and bathing for most, and possibly all, Flint residents. xxxEND_PAGE:treasury01_b38_6783_6976_090 leoeois'ee £ (lemsowv09 pue jenuepisay) 1505 pIVaLOLg puE [e>! | Hos cooves RETO 2SIACTRNPR 89 OF 150 [EDHOISHH IETOL spGeur, ¢ ouabuaary 50> mia Aq labpng 4.4 Ad Pag mip. oaidope ey FOL Ae RYT, LTR SRO LAR TROY PALMAR Arey HEALALID PITA tus BAR SOY DIO RS BL SLOT HN MY OH P102 fry 22 BPO at saree witvina 9, 6 bis odo g 02 buny puolg SUCK afad panrupy 61o2 Snbreriog Ant wey RO) NOIR] ALU Uber a aa Gan S1OC BURY ay de LOREL se trp yun paypal a {gs tis'pse 115¢2 papraead ota PpnIaU we ORTERRATUN AWaNETD BUR Speed ME Uae Aus (OT AMAA ur Sid, aqua) HORdURE IO Aa JO pvOW OG NURI LEB ay GIO DE TUN Bes 816g mualeTD, "Ypprnredie go? Aaron pur Clog HeqUADIG UL PALME Te Pi g.or Ammuga, PUR Sigg Umut Jo Y14014 8.9 #0, SPeOU JEN FNL fo Bou 01 BN] & Aemwoyst 9 01 Panowne Aba 8 pay jo Gr ag pie Bare Daya o1 Sinz IEnény BR Re AN HIF PORE Jo) wonseruea J3I0% 17] anaUR BBesate BA Bus Aa paynKhiIor oR SN HDI PDAON © Aripg avy way aoa 227 s9p24 pas A410 9900 Peay Brae Yr wHOMIEA EEG vy) yavow sOud oy) Wun) vb urUDS 20 Te BDIyON ART EPC VOY bys Uy tant patoy tr Oy Ag popRG adEAY 6 109 / S310N WILONEGISTU-Y FE fier = i 2160) JAD DUKE AOA (HOF S25, 22025) SENBWAYd DUAL “I RULY ACS) SINAN TYDIBO!SIE SINIAT uosswiay 02 s3algng pue sasodind Lorssnsiq 404 - LaWG xxxEND_PAGE:treasury01_b38_6783_6976_091 Cline, Richard (Treasury)