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�t 03 G7,Q9:21p Paul Sd-iimnowski 851-17�7114 p.1 <br /> , ;� ��� 1 �° �; � Y <br /> KB►T� C01�SULTTi1�CT., INC=......_......_.�_.........__.._.._�.........__.....___......_.._..__._....._........_.....--__................... <br /> ��i p.s��,�;;o�� <br /> o�co�3, aoo� <br /> Ha.n_e Frees <br /> Outdoor Excapes, Cnc. <br /> 6600 Oxford Street#100 <br /> St. Louis Park,MN 55426 <br /> RE: Boulder Retaining DesiRn Par�uxx;tcrs <br /> 2870 X,ittic 4rchard Way <br /> Orono, Mirmesota <br /> KBH No. 2007.l46 <br /> Dear ivir. H�es: <br /> This letter is bcing sent to discuss our ec�gineering dcsign paramcters for thc propoced boulder retairring <br /> walls ai the 2870 Little Orchard Way in Orono, Minncsot� This design wa,�based on a Lautd�pe F'lan <br /> prep�ared bY you dated Septembcr 6,20Q7. No formal soil report was ptuvided for this projcct. <br /> 1 ur►dtrstand that the p�oposed boulder rctaining walls on this pmjec[will be around the swimming pool <br /> arca on the north side of thc house. The tall�st section will bc along the north side o�ihe�ool and will <br /> have a 6-foot exposcd hcigi�t The rem;�indcr of the walis will vsry in expo9ed heigltt fmm 6' to 1'. <br /> There will be ltvel slopes ai the back of the wu�l��nd�)opes up to 3:l at the base of the wal]�. No <br /> extetnal surcharge or groundwai�r loads were desi�cd for this t�etaining wall. An embedment dcptl'� of <br /> 6"should bc maintained at the ba.�e of the wsill and a minimum wall bgtter/sciback of 18'to 23°(ap�>rox. <br /> 3 inches/vertical foot)should be uscd. <br /> Geosynthetic teinfarcement fabric(geogrid)should be installed�follows: <br /> - No geogrid i�required for this project. <br /> Rcfer to industry standard practice re'ferences for installation information,specificaiions, and dc'teils. <br /> - Boulders shall be pla�ced to dvoid eontinuoas joint ptanes in vertical or lateral dir�ctions. <br /> - Each boulder shal) bcar on two or morc rocks below it with good flat-to-fl�t contaci_ <br /> - E'Lacc a 4"diameter corrugated pecforatcd drain tile with sock at thc finished gade of walls. Outlet <br /> thc Main tile at 40' oc�-center and at low poirrts along the w�ll. <br /> - Compact any structural fill place be�ittd thc drair�age zone to 95%standard pmCtor. <br /> - (nSsall woven laadscape fabric beb�nd the boulde�to timit soil mig�ation through the wall face. <br /> - Drainagc rock shall consist of clean 1" minus crushcd rock(l00%passing t"� 75-100%passinl;'/.") <br /> - Refer to the attachcd typical soction for additiooal.ix�formatios�. <br /> Th�decign ofthe walt system assumea the following: <br /> - Soil conditions: Cley/Silt, friction angle=28.0 degrees, unit w�ight of 120.0 Ib/ft3 <br /> KB�-1 Consulting, lnc. <br /> 161 Dunbar Way,Suite 1!0 <br /> Mahtamedi,MN 551 I S <br /> (G51)779-7700 <br />