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CITY of ORONO Post Office box 66•Crystal flay, Minnesota !'"I'l;1•Municipal Officer+ On the North Shorr o/ Lake Minnetonka January 14. 1988 Robert Posthumus 242A Natches Lakeville, MN 55044 Rt: Lots 58 and 59, Morse Island Park - St ,tic Concerns Dear Mr. Posthumus: I have further reviewed the site plan and septic system design for the property on Big Island. In addition, I have discussed various concerns about the system design and layout with Dr. Roger Machmeier of the University of Minnesota Agricultural :xtension Service. Dr. Machmeier is a nationally recognized authority on septic systems and is likely the most knowledgable individual in the State of Minnesota regarding the design of such systems for residential usage. Based on his comments ana a further review of the pertinent ordinances, I would make the following comments and determinations: 1. The proposed sign is not acceptab_ as -is because the r ck beds are skewed in relation to the contours and therefore the assimptions used in creating that configuration are not valid. Mr. Parker used a literal interpretation of the codes to create this design but it does not in my opinion fit within the design perameters generally accepted within the industry. 2. If this system had been located in the portion of the property containing a percolation test, and if that percolation test had been equivalent to perc test #5 at 11 minutes per inch, the basal width perpendicular to the contour lines would be defined as approximately 25' with an additional downslcpe area of 12' required in addition to the approximately 20' downhill area required to maintain the necessary 4:1 slope for maintenance purposes. That would have put the ultimate boundaries of the system outside of your property boundaries. 3. Given that it was determined that the proposed system would not be acceptable, I then layed out the necessary constraining setbacks for this property to determine if there was any chance that the property could contain a well, a residence structure and a primary and alternate drainfield si`e, given the need for mound systems due to a seasonal perched water table. The limiting criteria are as follows: a) For the structure, setbacks on this lot are 75' from the lake, 30' from either side and 30' from the rear lot line. RI'II-DING A 2ONvING - 473-7337 • ADMINISTRA71 )N t FINANCE -- 473.7358 • NI NI I( %( IRKS - 4737339 AWSSINI