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12/05/2012 12: 03 9528872796 VARDSCAPES #2357 P. 002l00� <br /> ' s <br /> O <br /> � ► N N ERS <br /> � <br /> CRI7EFilUM•SCHIMNOWSKI ENGINEERS <br /> 16t DUNBAR WAY <br /> MAH70MED1,MN 55115 <br /> TEL 651779•7700 <br /> FAX 651 �79•7114 <br /> www,crileri um-schim nowski.com <br /> August ]7,2012 <br /> Lincoln Danforth <br /> Ydrdscapes <br /> 8609 Harriet Ave.So. <br /> Bloomington,MN 5542U <br /> RE: B�ulder Retaining'Wall Typical Section <br /> , , _ , . 3340 Graham Hill Raad _ _ _ .. <br /> Orono,Minnesoea <br /> Project No. 12-0720 <br /> Dear Mr_Danforih: <br /> This letter is being senl co discuss our typical engineered section for the proposed stonc retainin�walls at <br /> che 3340 Graham Hill Road pr�ject in Orono,Minnesota. This design is based on a landscape plan <br /> prepazed by Yardscapes dated June 26, 2012. <br /> 1 underscand tha[[here are a number of proposed re[aining walls loca[ed on the back side of the house <br /> near the swimrning pool in a dered configuration. The tiered walls will have a maximum exposed height <br /> of 3 feet caeh. A section or Single-cier wall will reaeh a maximum exposed height of 6 feet. A minimum <br /> rKrall hatter/setback of 8°(�1 inches/ver[ical foot) should be used. Slopes as noted below vaill be present <br /> at the top and bottom of lhe walls. No�roundwater or other surcharge loads have bee�designed for the <br /> walls. If site condi[ions vary from what is shown on the T�pical Section,please call me to discuss other <br /> up[ions. <br /> Refer to indus[ry standard pracuce reFerences for installation informadon, specificacions, and details. <br /> - Stones shall b�placed to avoid conkinuous join[planes in vertical or lateral direcpons. <br /> - �ach stone shall bear on two or more rocks below it with good flat-to-flat contac[. <br /> - Compact any structural fill place behind the drainage zone[0 95°lo standard proctor. <br /> - Inscall woven land.seape fabric behind the stone to limit soil migration through[he wall face. <br /> - Drainage stone shall copsist of clean 3/4" [0 1.5"erushed stone <br /> The de�ign of the wall sys�em assumes the following: <br /> - Sni] condiuons: Sandy Silt/Cla�,f.ricdon angle=30.0 degrees,uni[weight of 120.0 lb/ft3 <br /> - Allowable soil bearing Gapacity=2,000 psf <br /> - No external surcharge l�ading behind walls <br /> - Slope at bol'l'om of wa11,= 10:1;Slope at top= 10:1 <br /> - Minimum embedment c�epkh=8" <br /> - Stone Dimensions; 9"-10" thickness; l8"-30" depth; 36"-50"long <br /> ucENseo <br /> PROFESSIONAL <br /> ENGINEER3 <br /> HOM�&BUILDwG INSPECTIONS � <br /> STRUCTURAL EVALUATIONS <br /> ASSOC�TION RESERVFITRANSITION S7UOIES <br /> R ESI DENTIAUCOMMERCIAL <br /> RETAINING WALL pESIGN&EVALUA710NS , <br /> ,: � <br />