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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />II <br />II <br />I <br />I <br />II <br /> <br />22. b. Continued. <br /> <br />1. The stonn water discharge will ultimately be received by Lake <br />Josephine following treatment in sedimentation and rate <br />rontrol basins. The proposed on-site and off-site retention <br />facilities and the wetland area should protect the water <br />quality of Lake Josephine. On-site retention areas should <br />help min1m1ze accumulation ot sed1ments 1n the wetland area. <br /> <br />The qua11ty of stonn water runoff from the proposed develop- <br />ment should be better than runoff from comparable l'esident1al <br />areas that do not have rete~t1on bastns des1gned to skim <br />floatables and settle solids. <br /> <br />2. The san1tary wastewater wil' b~ r.onveyed to the Metro WWTP for <br />treatment and ultimate d1scharg~ to the Mississippi Rivtr. <br /> <br />23. Will the project generate (either during or after construct1on): <br /> <br />a. atr Pollution? <br />b. dust? <br />c. noise? <br />d. odors? <br /> <br />No X Ves <br />-No TVes <br />-No XYes <br />INO Yes <br /> <br />If yes, explain, incl~ding as appropriate. d1stances to sensitive land <br />uses; expected levels and duration of noise; types and quantities of air <br />pollutants from stacks, mobile sources, and fug1t1ve emissions (dust); <br />odor sources; and mit1gat1ve meaSUies for any impacts. G1ve the basis <br />or methodOlogy of estimates. <br /> <br />a. The pr~ject will generate a1r pollut10n 1nd1rectly as a result of <br />motor vehicle trafflc generatec by the project. M~tor vehlcles <br />generate: var1ety of poliutunts ircludtng carbon monox1de, hJdro- <br />~arhon:1 and n1trogen ox1des. The pr1~ry pOllutant of concern is <br />carbon moncx1de (CO) due to the potent1al for health effects ~t <br />relat'vely low levels for relatively short exposure periods. T~e <br />statt ~mb1ent a1r quality standards for CO are 3ij PPM one-hOUr <br />avera~~ and 9 PPM e1ght-hour average. These standards are set at <br />lavels to protect the most s~nsitive port1ons of the populat1on and <br />are not to be exceeded more than once per year. <br /> <br />CO concentrat10ns 1n excess of the ei9~t-h~ur st&t~ standard have <br />beEn monitored in the vic1n1ty ot the intersect10n of Snel11ng and <br />Untvers1ty Avenues and Lex1ngton and University Avenues 1n St. <br />Paul. The MnDOl 1986 Traff1c Flow map 1nd1cates traffic volumes of <br />over 50,000 veh1cl~s per day through these lntersections. in <br />response to these air qual1ty problems, the state is implementing a <br />vehicle 1nspect1on and ma1ntenance program to reduce average CO <br />emtss10n rates. The inspect10n and ma1ntenance program. which witl <br />be 1mplemented ~y 1993. is p.xpecte~ to reduce average CO emiss10n <br />rates ~y approx1mately 25 percent~ <br /> <br />10 <br />