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Lawrence F. Feldsien, P,E. <br />Glenn R. Cook» P.E. <br />Keith A, Gordon^ P,E. <br />Thomas E, Soyes, P.E, <br />Richard IV. Foster. P.E. <br />Robert G. Schunicht. P.E. <br />Marvin L. Sorvala, P.E. <br />Donald C. Burftardt. P.E. <br />Kenneth R. Meister, P.E. <br />Charles A. Erickson <br />Leo M. Pawelsky <br />Harlan M, Olson <br />)aks . <br />■o- <br />5ys- <br />)re- <br />!St <br />soils <br />It map <br />!8 has <br />Report. <br />r- <br />soll <br />wm• ; ;V-.- <br />M <br />ft. <br />t*ity of Orona <br />P.O. Box 66 <br />Crystal Bay, Minnesota 55323 <br />November 14, 1977 <br />Attn: Mr. Henry F. Muhich <br />Re: Preliminary Plat Review <br />Orona Oak <br />absornMo!^! to function effectively. Installation of anv soil <br />are sLwn in^^nl? recotnmende_d. The Glenco and Hamel soilsare shown in solid blue on the enclosed soil map. <br />^ss-hatch^r^^h°" recommended ^Thefr^iirare^shown^a^rbl^^cross hatch on the enclosed soil map. <br />in ^ <'ontent in the subsoil, which often results <br />in percolation rates in excess oi 50 minutes per inch. For tuxs reason it <br />IS recommended that an innovative mound system be installed on these soils. <br />cannot be installed on slopes greater than 6 percent. The Erin <br />JJith sio^g from 6% to 12% are sho^ on the enclosed soil map as a red <br />^re^^hora; so^^id'red. <br />Based on the Hennepin County preliminary soils report, there are major areas <br />and maior^ar^s no type of soil absorption system is recommended <br />^ serious difficulty with soilabsorption systems due to water table, soil type and slope. <br />Lrma? ^e%%dentoutlining the major steep slopes Normal residential development can generally be accomplished on slopes up to <br />18^81000^^^ without extra ordinary problems. From 12% slope up to^about <br />devplonmo h special design considerations must be incorporated into the <br />r:ioT:t::te^rrKa “ <br />overlaid on the proposed <br />plat, there appear to be very few areas left for suitable residential'^bulldlL <br />and septic tanU/drainfield placement. It is recommended tha“thfp~^^ <br />not be approved until the City of Orono can be assured that L aLauatrand <br />acceptable individual sewer system can be provided for each lot to^be platLd <br />It must be understood that the Hennepin County soils report is a prelimin«f' <br />evaluation, but the report suggests that the magnitude of soil prLlems rela- <br />M absorption systems is serious enough to required^additional in­ <br />formation prior to any further consideration. <br />Page 2. <br />t •• <br />hS <br />•V <br />ir <br />■a <br />(■r <br />-I <br />City of Orono <br />P.O. Box 66 <br />Crystal Bay, : <br />Attn: Mr. He <br />Re: Preliir <br />Orono <br />The external <br />from Orono v; <br />at either en< <br />entrance as <br />very steep, ’ <br />ing marsh ar <br />proposed lot <br />difficult. <br />The terrain <br />However, it <br />sensitive tc <br />If we may be <br />convenience. <br />Very truly : <br />bonestqoo, : <br />/ /