1303 MADRONA AVE 2016-01-01 MF Import

Gcolcchnicnl �ngincering Evnluation 130� Madronn Avc - Ring Deccmbcr 2, 200G RN11 Filc No. 39306 Page 5 Cl�e surrcial slope suils can Ue subject to slow buckwasting duc to wenthering, crcep, shallow sloughing, local erosion, and significnnt stom� cvcnts. This would result in slow recession of the slope f�ces. lf vcgctation is mninmined on the �lope bclow thc house, thesc effects are expccted +o be rninimal. Develo�:ment Conside�:�linns Nonnally a building setback Gom the top or toc of steep slopes is specificd to nllow for bnekwasting nnd slope failures. A set6nck is not practict�l in this case nor is it warrantcd, us t6e slope is nlrendy below thc angle of repose of the in srlu soils. 'Phe soil comprising the slope is a dense advance outwash deposit and there is little chnnce of fnilure if the conditions specified below are fullowed. Nevertheless we recommcnd ihat constn�ction should not take pincc widiin ZS feeCoC t1�c top of tlie stecp slope. 1'he Sitc 1'Ian on figure 2 shows thc location of the home on the site �nd U�e planned replacement. [3ased upon tlie conditions dcscribed above, il is our opinion that the slopes are stahle nnd tha[ the proposed locution for the replacement is reasonnble providcd ccrt�in prccautions nre txken during construction. Any disturbed nrcas should bc rest�bilizcd ns soon ns possiblc through vegemtion planting or other approvcd mcans, Nithin expased soil areus, vegcu�tion pinnting, hydro-seeding, and/or straw mu�ching arc effcctive means to minimize erosion and allow vcgetation to Uegin rapidly. All excavation spoils should be covered wiA� pinstic in thc event of rnin to minimize tlie potential for erosion and siltation. It is g�od prnctice to usc extcrior footing drains arowid all of the strucwres where moisturc control is importvn. Pooting driiins shotQd bc instnllcd nt Icast 1 foot bclow thc planncd fuished (loor slab or crnwl space elevation. The drains should consist of 4-inch-di�uneter, rigid, perforated PVC pipe that is surrotmdetl by Gee-ch'aining mataritd, such as peu gravel und wrapped in u non-woven filter fiibric. Footing drains should discharge into tightlines Icnding to an nppropriate collection a�id discliarge point. Crawl spnccs, if nny, should be sloped to drain, and a positi��c connection should be m�de inta thc foundntion drainage system. Roof drains should be tightlined separately of Pooting drains. All drainage should be routed to an appropriate discharge point. Sitc Prcpnrution �tnd Grnding '1'hc ncw building area aftcr demolishmcnt of the house should be stripped of v:getation, topsoil, loose soils, zind fill (if nny). Any slopcs should bc Inid bnck to nbout IH; 1V (harizon[ul: verticnl). Thc RMI ASSOCIATES LLC [,'d 6ST9-6Z9 f09E1 szoa�zyn�� N su�tsaQ d9S�E0 LO 60 �eW