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<br />'I\vo nnn_I''!'Irth']1mkt... rr.btc.tI gpnl()-1~r h~7'!'1r~... ,"''''Nt In th,. PI!1nning Art''!'I' 1!11ll1d1l1f''' (nnt rr.l!1tl'd tn
<br />"1'1..mir ..h'!'lking) '!'I1ll1 f'vp!ln<.:-ilTf' ..nil..
<br />
<br />, !llllklid,.....
<br />
<br />'-::1n~1.diding i.. ',1 11'I111r'I1 prrll.'..... nf rl.btivl'ly r'lpid dn\un...lnpp InnV,'ln,'nt nf ...nil, rnt"k '!'Ind rnrk .1phri..
<br />'!'I.. '!l 1T"l!1...... Thl' r'!'ltf' of l'!'1nd...liding i.. ~fff'rtf'~ hy thf' tyl't' !lnll f'vt,.".lt of vrgPtM1nn. till' dnrf' '!'IngJ,..., till'
<br />llf'gTr,... of ,v~tl'r "'!lhlr'!'ltlnn, thl' ...trf'ngth nf till' tnrk.... '!'Illl1 thf' m!1..... !lnd thirknl''''' nf tht' dt'pn..it Sntnf'
<br />of thl' n'!1hlr~1 "':lINt'<':- of thi... in..t!1hility '!'Irl' r':lrthlpl':lkc..., \vf''!'Ik tn!ltrr1':lk. ..trf'!1tl1 ~nll rO'!'l..t':ll pro...inn '!'Ind
<br />IW!lV)' r'!'linf!111 In '!'Irll1it1nn rl'rt'!1tn hlltn'!'ln ':lrtlviti,.<.:- tl'nd to IT''l!lkp thr t'':lrth n1~tl'rl':ll" If''''' ...t':lhll' '!'Ind
<br />inrrl'':l<';'l' tlw rh!1nrl''' nf grnllnd f':lihll"> A..tiv1tl,.... t"nntrihllt1ng to in..t!1l)ility inrhlff" "vtpn<.:.ivl' irri~tinn,
<br />porn lh':l1n':lgf' or grollnlhv'!ltf'r \Vith.lr'!'lu'':ll. rf'mov':ll of ..t':lhlli7ing Vl'gl't!1t1nn '!'Ind nVl'r <.:-tpf'r"ning nf
<br />..Inp..<.:- hy IInrll'rclltt1ng tlll'm or .nrf'rln!1rling thf'1T"l \\,1th '!'Irtifici'!'ll fill
<br />
<br />[m,wed herel I.andslidcs can involvc both thc simplc sloughing downslopc of a small-sizcd surficial
<br />landmass for a distance of several inches or massive earth movements of Inany feet. 'nil.; Ltw,.:.l "-dll
<br />"-dU~\:: ~UL:HdlJt~,d J,ullab\; lu LlIIJ ,tllJ ~uudu.l\;:'). Landslides may occur at any tilne but are more likely
<br />during the rainy scason, whcn soils arc saturatcd with watcr and thcir cohcsive abilitics arc morc likely
<br />to brcak down.
<br />
<br />In thr Plp':l"':lntnn Pl!lnning "rf''!'I, ':lhnllt H.OrlO ~rrr'<;; -::1r" in '!'Ir,.'!'I" nf mn"tl)' bnd..lid.. 2 Figllrl' V_l dll"\\\"
<br />'!'Irf'':l<;; with mr.."tly l':lnr1dir1l', f"'\1 bnlklid,., or no l!1nrldirl.. .1'-pn..it, '111f' '!'Irl''!'I'' nf nn bnrldirll' .1f'po..it...
<br />':lrf' IT''l'!'llnly 1f'",.1 '!'Ind g/>nl'r'!'llly dn nnt rnf1t!1in r!l...t nr rlJrrl't1t bn.l..lidl' ,l,.hri..
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<br />Fyr':ln<.:..ivl' Soil..
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<br />[IT''lnlTf'll hf'rf'IExpansive soils are surface deposits rich in clays that expand when wet and shrink when
<br />dried. Wllil\; lItl:') !:)\::ulug~l.. II.tL.,l.lJ JUl,;~ JlUl plUaU"-\; lll\:: l..dld~LLul'hll.. ~llIpa"-l:,) u[ d l.ug\:: l,;'lIlh4..Ju,d(,.f.:,
<br />1I1\::~ "-lII1IUI.I(~V\:: \;"-UIIVllIl"- ,,-u~l lu .1 "-UlIlIlluully "-,UI lJ\:: l..UII~lan.ILI\;, SJu~uk-~wdl ,t"-l~\'lly ;11
<br />~uL~Ulfa"-\; ~ua~ "-,UI ~niuu~ly aalll<lg\:: IJui:laillg fUUIIJ'lllUII~, ~lI\;d~ ,1lIa Udl\::l IMV\;J ,1.l\::,I;:', UUJ\::lg.lUlIIIJ
<br />ut.i:l:lLi.\::~, dllJ ~W~lJlIlIllIg puub. \*'11\::11 l,;xl'all~lv\:: ~u~b tI.l\:: IH\;~l,;lIl UII ,I ~lup\::, dl\::Y l..dll IHUlllul\::
<br />JuwlI~lup(; 1..1\,.:\::P ur dl('; \::1Il~.l\:: dlld"II\;~~ ur ~u[b.l..~dl \.kplJ~ll;:' IH\::;:'\::lIl UII dl\; ~lupt; (ill ~UIII\:: "-d~\;~ UJ
<br />J\,.:plll;:' u[ IIIU.l\:: 1l1.1Il kll f\::d).[mo\Tl'l1 lwrf'] Expansive soils are potentially present at or near the
<br />surface in arcas in northcm Plcasanton and along thc northcastcrn flank of Plcasanton Ridge. A
<br />modcratc potcntial cxists for thcir prcscncc throughout thc rcmaindcr of thc Planning Arca, and
<br />site-specific studies are required to determine their actual presence at a given location. rlgU.ll,; \'-$
<br />~l1u;:,L[<lk~ LlI\:: llllJnl}llJg gl,;ulugy u[ lll('; rl.lIll1~lIg j\.l\,.:d wltldll..,1II L\:: UM.:a Lv iJ\;lIt~[y tI.l(,;,l:') LJ[ IHvLtilJk
<br />\":XIMII;:'~VI,; ::Jua~.
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<br />Seismic/Earthquake Sctting
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<br />A~ is th~ {'rise fOT most of r::llitornin peopl~ :md property in Plens::lnton ::lT~ ,,"hjPp.t to risks frnfl1
<br />seismic a,,',vll}' A"corclin~ to the t J S Geoloeical Survey (1 lSGS) Workemup on ralifomia
<br />r:nrthqll:1kp Prnh:1hilitie"J there: is. :1 oJ percpnt proh:1hility of:1t 1(,<:l"t OtW m:1cnitllnt" h 7 or crp:1ter
<br />qll:1kPj c::lpnhle of cnus.inc widespn..nd d:1fl1:1Cf" "trikinr. the Sn" Fmncisco Rny A Ten recion hetoTe
<br />1011 Thp -:lrt;vl' f':lltlt...4 in nr n(>':lr thl' Plf'!1<':-!Intnn PJ~nning Arl'!1 inrlll.11' tlw r~lb\Tl'r'!'l", rnlwnrcl_
<br />
<br />'-_ABA~2
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<br />j 11~r:~ .\ pM! ?noJ
<br />
<br />Public Safl'ty OR2<)l)(" mllinc
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<br />V-2
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<br />City Council 8/29/2006
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