|
<br />,
<br />
<br />~;Jaf"ch 23, 1990 Dr."ft, Rt~pc'rt -. FOR REVIEW ONLY
<br />
<br />3. Adoptjol'l Df re9L1J.2;.ti{)1l~;, rc:<qt.\:i.rinq slope stability Rnalys:ls and rt~gllJating
<br />nQW development;
<br />
<br />~+. Noti fication (if lando~'m8.'j:'s in mudfltlw-prone arE'f.lS;
<br />
<br />5.. Stn.lt:turaJ. meaSW-E.IS SLiCh a~. dc!bl~i!:', basins and dE'!,<,.lj;\terinq of lH1f:~tab~le
<br />=dDp@S:t
<br />
<br />6.. Acqu:isition of structures in tl1udflt)~'I-prClne areas; and
<br />
<br />! ft Planting and citht'?i"' r.-;oil consef'\'atiDll ml::~ap',UrElS..
<br />
<br />Of thf?Sf)~ option 2 is recommended fCH" CF;:S credit above. Dpt:l.Cq'lS 3~ 4~ 6 and 7
<br />arE.' recommended for CRS credit bedohl" Option 1. may imprDVE-~ h~,,-;<zard mana.gement~,
<br />but: it ~'muld be'difficl.llt trJ measurE? objectively. Option 5 may he an integral
<br />part of ~ ma~,t.E:~r plan felr mudflr.I~'J hazard management, but nt) CHS Cl"ccjj t is
<br />allo!",Jt.?d fo..-- n2~'J stTuctural floc)d control meaSLn-es at thil3 time~
<br />
<br />DiEcloS:Ll\'{~ of gecd.ogic ha4.al~cj=i, inc:J.!lding landslides, is n:?quhed jn sDvr:wal
<br />C~lif(irnia comfJ1unities~ and Santa Clara COU'(1.ty~ CA rer.:llJire:::. t:h:3t gEfCllogic
<br />hEl7arcl~:; be recorded as a condi.ti.on of developmen't" A J.i:H"Ki~,J:ide dj!::0s:t:l:::i jn
<br />sout:tH?rrl C~.:difr.l)'"nia led to the demDlition of 22 damaged hDmes in clrder to abate
<br />~ llnl.d si.-)"ncE.,II. CtqT;muni tie~:.i in CaJ ifornia, Dhio and l,~a!:.hinqton have devElope!o
<br />Cf iteriB f(l~~ i.:he j-eqL\if'emt~nt of gr.-?n}ogic studies prior' to de:~~'le]opmc'nt of
<br />liH:d~::} idE' prone areas~ L.ow densi.ty zoning is r-l:~qLlij'""E~d in Ei.rea!:;. Df I,.m~,table
<br />slopes in SEll) NateD County, C{.\u v).;::n~ning s;/stems for geologic: hazar'os have been
<br />:impJellH:-?-nted :in AJ!1Skl:\, CaliforniE\ and I"1Dntana (!(ockelman~J 19B6) " Funding from
<br />thE.? Federal Emerqency Managemer~t Agency (FEMA) a!E:.sisted in the acqui si tiDn Df
<br />26 !;=.t;T'uctures in thl? City of San Bernadin!')~ CA (FEI'1A, 19B7)"
<br />
<br />Ihft.."~.LtY".J~~f,..,,,_~~".n!;inn@.tj_",....J]J:!. iequ 'late::l E~nvi ronmental hi 11 s;.ide d:~ scr ic r,s:. \.<Jhich
<br />have at least. fOLn- of thE: fOJ.J.Cil~~:ing charactE"~r).stic5~
<br />
<br />SIDpe~) greater than 20%;
<br />E~dstenc:e of t:::ope Formatic1n;
<br />Highly visible hillsides;
<br />Hillsides which provide views of major streams or valleys;
<br />H1:1.1~;:j,dE's ~\lh;i.c.h s.e)~ve a~:. identified community boundaries; or
<br />HLt hd-.des tl\lith a sub!?,tant:i?l fj?lt.l\fi::\l wODded cover' (KockeJmBn1 j986)"
<br />
<br />IJH~.".__..G..tt.:L........gf.~_..1.2.a-B1.lqgtlg.~~_,-__._J;_Ei requi res ill study by a soi ls:. &091 neer and af}
<br />enginr:'!?r'ing g201.{Jgi~,t for any hills3de qrading ~\lhere stabil:i,t;y ("d)] be JeS:.E€)ned
<br />by the grading~ at historic or prehistoric landslide sites, 30d unde," D'ther
<br />=pc:cjfj-::::ci condition!:..:,.. I(M)f:.~re bL\iJ.d:J,(jg~. arE~ to be- S.Llpportl:.~d on ~t.jJts elver a
<br />fill slope with a slope greater than tWD horizontal to one vertical: "fDotings
<br />ffil.l!5t E'id;enr.i at least. thl-eE.I feet into t.he underlying bntlrock!J but nDt :ICES than
<br />the dE~pth '(equired tCl resist thl-:? lateral load; \-oof drE.linElge musl be CD] 'teeter:!
<br />e.nci c:crnductRd to the !5tr'eet in a non'-6'i-osive mannE:r; and p]3nt:1ng;if:; j.eql.l.1rc.;~d
<br />for err.I!:;.ion control" Thf:.~re arE' also detailed c'ngineering standEJ.cds. for the
<br />pj .13fH.:1!5 or' r.:ai550rlS (FE/'1IA, 1987)"
<br />The r tt~g?._gf....g1~,PC: DJ.;L...P.Ji!1.f@._":.L9,r:9J;'2...__~JJ.9-..J?{2.!1....Bgr.JJ~fl i 11!~L"..~,0.__..s.nl;t.JQJ~..Lttl,,_....G.Q.Ynt:r:, ..Hi!
<br />
<br />MF-6
<br />
|