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Grntcchnical Gngineering Evr� :ion <br />4708 Seahurst Avenue--Cazter <br />September 17, 2006 <br />RMI File No. 3710G <br />Page 5 <br />'ihc surficlal slopc soils can bc subjccl to slow backwusting due ro wcathering, crcep, shallow sloughing, <br />local erosion, m�d significanl stonn evenls. T�his would rcsuit in slow recession of the slope faces. If <br />vcgc�ation is mninlnincd on thc slopc hclow thc housc. thcsc clTccts arc cxpcctcd to bc minimal. <br />Development Conr�idcrations <br />Nonnally a building sctback from ihc top or toc of stccp slopcs is specificd to allow for b.icl;wasting anJ <br />slopc failures. A setback is nnt practical in this case nor is i� �+�arr:mtcd, as the slope is alrcady helo�v ihe <br />anglu of reposc ol thc in sin� soils. Thc soil comprisin� thc slopc is a vcn• dcr.sc till �md ihcre �s littic <br />chance of failure if Ihc conditions specificd bclo�e arc followcd. <br />l'hc Sitc Plnn on Pigurc 2 shows thc loc�tion of �hc homc on thc sitc. '1'hc planncd additiai is on �hc <br />north sidc of �hc humc. Rascd upon thc conditions dcscribeJ abo�'c, il is our opinion ihi�t �hc slopcs arc <br />stnblc and that tlic propuscd locatiun f'or thc addition is recisunabic providcd ccrtain precautions arc tnkcn <br />during conswction. <br />Am� disturbed nreas should be restnbilized as soon as possiblc ihrough :�egclntion planling or other <br />approecd menns. N'ithin cxposcd soil areas, vegetation planting, hydro-reeding, and/or straw mulching <br />arc cffcGivc mcans to minimi�.� crosion and allow vcgetation to bcgin rapidly. All cacavation spoils <br />should bc covcrcd with plastic in thc cvcnt of rain to tninimim thc polcntial for crosion and siltation. <br />It is good practicc to usc c�tcrior fnoting drains around all of thc structurus �t�hcrc tnoisWrc control is <br />imponunl. 1'ooting druins should bc installcd ut Icnst I foo� bclo��� thc planncd finislicd floor slah or <br />crawl space elevation. The drains should consist of d-inch-diameter, rigid, perforated PVC pipe that is <br />surroundcd by frcc-dr.iining maicrial, si�ch vs pca gra��cl nnd �vrapped in a non-woren filter Tabric. <br />Footing drains should discharge intc �ightlincs Icading to an appropriate collection and discharge point. <br />Cnwl spaccs, if any, should bc sloped to drain, and a positive conncction should be made into the <br />fimndaiion drainage sys�cm. Roof dra+ins should bc tightlincd scparately of footing drains. All drainage <br />should bc routcd to an :ippropriatc dischargc point. <br />tiilc Prcparalion und GruJink <br />I he new building arca shn�dd bc stripped of vegclation. tupsoil, bose soils, aud till (if any). Any slopes <br />tihould bc laid back tu �ibuul I I I: I V(hurizont.�l: vcrticap. l'hc subgradc hclow any pinnn��d slab on grade <br />RMI ASSOCIATES LLC / <br />�I / � <br />