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11:12 ~qovemberB, 2004 JohN0.2648,100 Page 6 i Ketaining wails can be suppertexi on drilled cast-in-place concrete piers. We recommend tha~ the following criteria be used in the pier design: -----"---'~'""~ 500 me ~o~nd surface is no~ confi~d by s~s. ~r . . pav~meot); (may b~ ~cr~ed by one-~a tot se~s~c ~d wind Ioa~ ' . ....... ~ ...... feet if~e ~ound s~fac~ is not ~nfin~ by slabs or pavement. ~re ~e gound i~ sloping in'~ont of~ wall neglect passive suppoa until ~t~ is at l~t 6 f~t of soil in ~ont of th* pi,r pr m a dep~ wher~ ~ i~ at I~t ~ice ~* reminad h~i~t of soil in ~ont of~ pier whichever is I~s) (may b* incr~ed 6 Minimum Pi~ b~c~ ~ piers sho~d b~ drille~ ~d po~d ~ the ~ day to ~event the soils exposed ~ ~a pier hol~ ~om duing out sig~fic~tly. If ~e dffiled pier hol~s ~e ~ be le~ open overnight for production p~oses,' .~e.. drilled ·holes should be ~v~red; ~owever, th~ pot~mi~ for ~ving incr~d ~ tim*. Drilled pier ~h~ sho~d b* ~% of all loose soil ~d de~s prior to ' placement 0f concrete. If water colle~ in ~y drill~ pig sh~, it sho~d be p~ped out i~ediately pfi~r to placement of con~ete. Al~mat~v~ly; concrete may "t~mie" me~od. In order to m~imize upl~ ~e piers should be avoided. If necessa~, fo~ should be plac~ pier sh~ during concr~te placement. SEISM1C HAZA~S FAULTING 'l~he lot does not lie within a $~ate of California Earthquake Fault Zone for active faults. There are no fault traces mapped across the site~ nor did we find evidence of a fault; therefore, we. conclude the likelihood Of fault rupture across the lot to be low. GKOUND SHAK1NG In the San Francisco Bay Area, laxge magnitude earthquakes are a strong possibility. Depending on the epicenter and magnhude of a seismic event, ground shaking may occur throughout the region. We feel that the subject property, due to the close proximity to Known active faults, will experience some moderate to very strong ground shaking during the life span of the project. o~=,~, ~_R!C!.I y!.D..T~I_ME_.HiNOV. 8. Z, 10: 32AMf^NTS