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0­~ [T _i of ORONO <br />Yost Office Box coi liny, Minnesota 5532:' • Municipal Off.cea <br />On the North Shore of Lake Minnetonka <br />January 19, 1988 <br />Robert Pesthumus <br />24200 Natches <br />Lakeville, MN 57,044 <br />Re: Lots 58 and 59, nurse <br />Pear Mr. Posthumus: <br />rk - Septic Concerns <br />I have further r viewed '-.he site plan and septic system design for the <br />property on Big Islaijd. In addition, I have discussed various , oncerns <br />about the system design and layout with Dr. Roger Machmeier of the <br />University of Minnesota Agricultural -xtension Servo^e. Dr. Machmeier is a <br />nat4.onally recognized authority on septic sys'-cr d is like1 v the most <br />knowledgable individual in the State of Minner ;arding the design of <br />such systems for residential usage. <br />eased on his commc.ts ad a further review of the pertinent <br />ordinanc- s, i wo,.1.,] make ti_E .,llowing comments and deterr:..Lnations: <br />1, The p-,opt design !r not acceptable as -is because the rock beds <br />are skewed i tion to she contours and therefore the asjummptions <br />used in cre: aa% configuration are not valid. Mr. Parke- ::sed a <br />literal inter, .tior the codes to cr- -`-- this design but it does <br />not in my opinion fi.• t ,in the design 1 . ..,eters a_enerally accepted <br />' rin the industry. <br />2, If t system had ^n located in the portion of the property <br />contain' in test and if '_hat percolation test hae.. been <br />equi t #5 a- 11 mint-tes per inch, the basal width <br />pert.,.., ­ antour lines would be defined as approximately <br />25' 4 it downslope area of 12' required in addition to <br />the d,awnhill. area re-quired to maintain the necessary <br />4:1 purpc.,es. That would have rut the ultimate <br />boun tae d,- tem outsid ..F vou- property bount'aries. <br />3. Given _tia,. it was determined that the prcposei system would not be <br />acceptable, I then layed nut the necessary constraining setbacks for <br />this property to determine if there was any chance ::hat the pro' erty <br />could contain a well, a residence structure and a primazy and <br />alternate draLnfie.d site, given the teed for mound systems due to a <br />goasonal perched water tale. The limiting criter_a are as follows: <br />a) For the structure, t etuacko on this lot are 75' f; om the <br />lake, 30' from eitnnr side and 30' frcm the rear lot line. <br />M'llDING •IONING 473'13 • AOMr4:STI._PIN aCI PtBtR WORKS -471-71S9 <br />ASU SSIM; <br />