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Geotechnical F,ngineering Gva� ion <br />470R Scahursi Avenae--Carter <br />September 17, 2J06 <br />RMI Pile No. 37106 <br />Page 4 <br />GEOLOGIC HA7.ARDS <br />Erosion Hazard <br />l'he erusion ha�ard crileria uscd for detenninalion uf affected areas include soil lype, slope gradient. <br />�egctaiinn cover :+nd ground water conditions. The crosiun scnsiliv�ty is rclatui Io vegetalive covcr an;i <br />thc .p«�r� s�,�ra�� soil typcs (group classific�tion), which nrc rclatcJ to lhc undcrlying gcologic soil <br />units. 'I'hc crusion har.ird for thusc soilti fi�miing Ihc upper slopc. is lisicd as bcing low when strippcJ of <br />vcgctalion. <br />7�hc propuscd silc imprmcmcros should im�uhc minimal disturbancc ofscils on thc slopa "I'hc �x�lcntial <br />for erosion may bc rcduced by main�nining vegetation on the slopes and b}' controlling surface watcr. <br />fhc proposed improvemenl's poten�ial I'or II1CfC851i1� lI1C Cf051011 hnr.�rd on Ihe slope can be furlhcr <br />limited by revegclalion of arr.�s uf soil disturbed b�• cons�n�ction as soon ns prac�ical. <br />Seismic Hazard <br />I I1C SIIC CITtiS IS C TS SIIO\tlIl II/ I:1IlIC 1615.1.1 nf thc 2003 Intemation�l Building Codc (IDC). <br />Ifa�ards associatcd �aith scismic acti�ity indudc liqucfaction potcntial and reduction of slopc stability. <br />I.iqucfaction is causcd by n risc in purc , rcssures in n loose sand dcposiL T'he very dense soils lhat arc <br />inlcipreted lo corc lhcse slopes have a low pntential 1'or liquefactiun. A rcduction in slope stability may <br />Jc�clop during cpisodcs of strong ground motion. Should thcre bc a reduction in slope staHility, wc <br />cxpcci lailurc would occur mainly in thc loosc su�cial soils on thc slopc. <br />CONCLUSIOnS AND RECOMMF.NDA'CIONS <br />Gcncral <br />II is our upinion that the silc is cnmpatible, f'rom a geotechnical engineering slandpoint, with the <br />propuscd dcvelopmcnt. '1 hc underlying deposits on the lol and in thc slope on which the heuse will hc <br />huilt t� picalh' harc hiEh slrcu�th �md arc cunsidered stablc with regard lo decp-scatcd carth movemcnt. <br />RMI ASSOCIATES LLC � <br />SI�� <br />