4805 BELVEDERE AVE 2016-01-01 MF Import

Subsurface F�pJaratian, Geofogic fla ard, and Uclvedere Lnrs Easr Pre(iminary Geotechnim! Engineenng Report E� crcrt 14'nshin mri Preliminarv Design Recammendations III. PRELIMINARY DESIGN REC01�4n4ENDATIONS 8A INTROVUi,:'ON Our exploration iadicates that, from a geotechnical standpoint, the parcel is suitable for the proposed de��elopment provided ttie recommendations contained herein are properly followed. We recommtnd that bu�ldings on Luts 32 through 34 be sited ac or behind the top of the ste� , (greater ihan 40 Percent) slope; however, special foundation design criteria are recommended where construction of strucwres is planned within 40 feet of the top of the slope. Although slope stability analyses couducted �or this study indicate low factors of safety for theoretical failure surfaces located within 40 feet of the top of the steep slope, mitigation of these hazards can be achie��ed. Details regarding the recommended foundation design criteria are provided in the Foiu:datiorts section of this report. The top of the steep slope is depicted on the Site and E-xploration Plan, Figure 2. It should be noted that in determining tfie location of [he top of the steep slope, slopes at or above 40 percent grade but equal to or less than 10 feet in ��ertical height were not considered part of �he "sieep slope". 9.0 SITG PREPAFtAT10N Site preparation of thc planned building areas should include removal of all trees, brush, dchris, and any other deleterious materials. These unsuitable materials should be properly disposcd ot off-sitc. Additionally, an}' areas of organic topsoil or fores[ duff should be removed and the remaining roots grubbed. Arcas where loose surficial soils exist due to gruhbing operations should be cunsidcrrd as fill to the depth of disturbance and treated as suhsequcnUy recommended (or structural fill placement. 1+ny buried utili:ies should he rrmovcd or relocated if thcy are under buildiug arcas. The resulting depression.� should be hackfilled u•ith strucwral fill as discussed uuder the Strvicturnl Fi!/ section of this report. All fill soils belo��• footing arcas should be stripped doH�n to the underlying, medium dense to dense or stiff to hard namral sediments. In our opinion. stable temporar}� construction slopes should be the responsibility of the contractor and should be determined during construction. For estimating purposes, however, Ne anticipate that temporary, unsupported cut slopes in the loose to medium dense weathered namral sediments can be planned at a maximum siop, of 1.SH:1V (Horizontal:Vertical). Llnsupported cut slopes in the sti(f to hard silt or dense to very dense native sand can be �7l�flfl!'C� at a maximum slope of approximatel�� 1H:1V. As is typical with earthwork c��,crations, some sloughing and ra��eling may occur and cut slopes may have to be adjusted in thc tield. ln addition, WISHA/OSHA regulations should be followed at all times. Permanent, unsupported cut or strucmral fill slopes should not exceed a gradient of 2H:1 V. ,5fnr:li 5, '!X7-t ASSOGA7'ED E1RTN SGENCES, 1NC. ;.: , �, ,,; �� -„,..:, :�� ,�, �:� H,, µ=, Page ]0