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Jne Yar.ta <br />Army Corps of Engineers <br />Sepieinber 6, !995 <br />’ Concern by t!.;? affecteH citicr over lor.g-ien:: operiticn and niiinienanon tccls <br />asscf'ialed with the hypolinrif .'.:; sjat.O'i system, hi anditioi:, input vartO'-t: <br />regulifc;y agencies irdicai.*"^ r preference fci a ’l ni treaimcrit over s.k r <br />result, alum ircr'.tniP.n' va.s surct'tuied for aeration in the iriclcne'^atinn ^!rr.. <br />Viie cun er.t d;-.aign of the project, us ref:acted in »rc- f.na: de.hg.i repci\ da.e:l Tv'ay • h''-;'-’ <br />ihe following project components; <br />Construction of a 2.5 acre wet detention basin cL County Road No. 6. <br />Consfuction of a 6.1 acie wet daention basin at Deer rTill Road. <br />Enlargement of two existing sedimentation ba.sins by a total of 0.46 aCie': in ib=: Ciiy of <br />Long Lake Park. <br />Alum treatment of Long Lake. <br />Cooperative agreement with the Cities of Long Lake, Medina, and Orcao irqUiOrg <br />development of policies end dir.r.en-nnai'r.g inform ttion in BMPs. <br />I'lc project as di.>cusscd in ihe ren^ised irnplcrnentalion piari i.s skghrly more tffit-iant in ic*.‘O’.' n-_, <br />phosphoats then projec* outlines in the September 1994 imulemen'ation p'an and the eshnv-.ted <br />cost is 2.1 million dollarr. <br /># <br />II. Wet Detention BusirAVetlands Selection <br />The feasibility study (Volume 2 of 2 October 1993) fbtmd wet detention basins to be the <br />kev BMP in leducinn external ohosph-nrur loa-.’ir.g tc Long Lake. '.Vet detention tasi >e <br />are widely accepted us effective ar/J raiinble ir-MFr v.'iih longevity lit t xc.eru 20 yci.v <br />The Minnesota Pollution Control Agency (MPCA) shares the above acceptance of wet <br />detention basins and stales “detention ponds are one of the most effective BMPs availab!.’ <br />for treatment of urban runofT’ Pro.eclirt Water Quaiily in urban /.re:u, .'.’y <br />1951). <br />During the planning and design of the project, ai. ex.naustive analysis was coiiipleiec' ’. /'•urh <br />evaiuated all alternative we: detenuon basin sites The fehowing surnrmiriite: th*. <br />.niternaiive sites (downstream to upstream) and trt fe..sibi!;ty of their use for :h;; y. oj'- - <br />• .ONR wetland east of County Road No. 6 we: deioniion casin/' vetldr.d. This nrau: -.: <br />wetland has been ditched and was e'^aluated as botli a wetland restoration site and .'. <br />that any proposed <br />the soil analysis completed found the soils were unsuitable for basin constructicn. <br />N vOlt5^20^WORI^MJY(»065 .MEM ArS.Ij¥