HomeMy WebLinkAboutAL Pettygrove Block 2 Lot 4 - Geologically Hazardous Area - 1997.03.26seEr-(rtr-(J.+ Ul :55P Lres iqn Studio' ' 63167/2A54 E8:O7 29622{AAL8
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POnT HAOLOCK, wASHtNGTeN 9A339360.379.9661 360-3 z9 -0 t 50 FAx
Ms. Colcne Kosrclec, p-E-
f,hvdopmenr Roiew Endncer
Ctryof Pm Townscnd
540 WatcrSecer
Pon.Iopnscnd WA 9E369
R.e: Michele Sandovrt and lvlarry Gay
Ncw Rcsidcnce, euincy and Adscvclt
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Dear Colene:
ls.o5-100n- r.
I am uriting regarding thc aborrc pujecr and it s Topprng ou rhe ciry ESA Maps as accologically llezarrdous arca' orioirnrial ama hior u discussioa of rhe orrdinancepardculals and &eir reladonship u ais sitc, t need io rrrriry trro, I do nor repnssenr myscuto be a gcotechnical engincer. As a crrr eogheer, when ri;.i rhff &e poteniial forinsubility cxists' I regues-t fErmd geoteclnicat evalrntions and rccommcodarioos frwc$capucs who plcti:r.., ryf.p*ialry- wirh &is si*, i do nor uerievc thu rhare issignifieant risk qr likdy ininbili|, -di wish o wd;J;rhy I bctiwe that rhis siteshould not bc aa ESA undcrthe
"hssifi.".ion connincd wifiin itrogn"i*ntr cnullyscnsirive A&&s otai .o.oT, specifcally rmder seqdon rg.0ilfrd B. This secdo' of thcordinance conrdns critccia fc identtyn s cr*r"gtuilti;;;us A,reas as fo[ows.
The site and ues gre uappcdia rhe USDA S.CS Soil Survey of Jeffcrson Countyas orllam serics soih ;Lcr cralarn gravgny se'dy ro.r,bi" 15 pacent slopes(CEC), orC_lallam gravelly sgndy tori, tS o 30 permt slopcs (CED). Ihesesqils are srcll draiacd soils *-hich h.r."'"*y slowty e.r;fi; .emenrcd iayer ar adepttr of 20 ro 40 irchcs, urd has roaoarc p"rmeririiry above dre cenncnred raycr.The hszad of erosioo is srighr ro -oa"oio no, oe cor6 viri;r and nodcrarc forthe cmD varianq born of which rru tess rhan ttrc ;*;;;il'r.r,*,adngrcquircd for Classification undcrrhis puagraph. '- .-J
while oo slrc, I hurd du-g y:.nrJpirs to obscrvc subsurface condirioos. oue pityas due ro approximarely 40 inchcs, aad showcd ,h";;;;-orrrr*, ."n !obrqwn, moisr' firrc l,oamy_sand 1o srndy roam- I e.ridt a t" ,ir, .na clay contonrthroughout rhe proftle Os *g00 sie"ej "ii"r, than 5 pe,lceru. whle no gradarion
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,:,:.y Ms. Colcrrc Kostelcc. p.E.
March 26, lggz
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rests wcrt pcrformed,J h.r: hrdsonrc cxperience in estimadng sih conrenr frornsamplcs ftom our work wirh on sire scptiisysrcms. The Frofil; was wellconsolidatcd but not compa'rcd or ccmcnred, conraincJ ;; b*;;;iril* coarscf,rnarcrials or fine greincd scdirrcn$. ufr, avery smau pateniagc or gnvat-
Thc second pir was sinirq ln thc uppcr 12 .o 14 inchcs, but was abandoned d,ue rodifific.h root diga"g condfuions. se.,crar othcr shelrow pis w.*e dug o check forrhg prcscnce of fills and/or cganics bcro* he teaf litsr rnd humus.
19.05 100 E_?,,
The alca is characrcrizcd by slopes greercr rhan the 1,5 perccnr rhrcshold requircdfor ua_pping and ideutiffcariqr as a porcndar ESa Hoi.r*, irin* ;; ;;ibrypesCpsibed within tbc scs c profflcs as t oxen'ea on sirc conffro cifierftrte'tcdding gnnuru end siltycrrys r {$r" orpctctred warer rabk, spaings, orgroud wotrr loG?8€G- I do norc rhat &e Scs indiciro rtr", in qpecificioi",lonorhcre is $c potcndal of lareral wetcrnow."or at*. rhc csrcared tawtdrringthe rainy sessoD.- Durhs my sia visir eaticr tis sroit (which is sodsid'red .i,ewet season), soils were ooist but nor sannaed, and no waEr able wrs obscnred.
19.05-100 B. 3.
This site in sgecinc {nd rhc Erca h gEEerEl docs rot rFpear o be subject no mr$sr'ova&ent of crttr. Tb9 exisring homc ro rlre nqth riong nooscrrett wasdrring Ty sire inspccdon. Ercsgirc.onrmroi6o h &c ,ofvJgSO*, ,L,booc has not expai'encoa {igpag1, senlancnrs, or oftcutricr *-,1ili ,rr, "pr,ileanh dcspie ir's cutino rne littsae lrc*ion rn o"*r ,p* *rr-lrrfo o"y-""",the uptrill sidc of the hosre whcre I would. rt". ripotca he footirgs m inmceprsubsurface wetcr molcrcnr Furtlrcr, **go"o fi-"oi*ar, "ppfi l*O, *U;ffi*rff r didnot aob anv unusual sufice eanucs-ttrg, ",i6ii"dicar.;an
r,o os roo n a.
There ore no drainagc channcls proxinare ro or through rhe propcrty, incl'dingsrr?iurui, dirches q rhe like.
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206 783 7562
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lvls- Colerre Kostelcc, p.E.
March 26, t9g7
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arachmenn SCS SoilsTpcMap
la n5_ | no B. 5.
The site stopes &te less- than 40 P"T:il- No opographic rnapping of rlris spccifi,cparccr has been creared bur I measrued slopes;o ,; d-*r,g my sire visir wirh aK&E hand rcvel and gtd. ,"d, ; rouoJt" ,]op-.ir'a. ress than 30 perccnrro,05..100 B, 6-
The site fut-*! appear to bc suscepdble ro scvgrc risk of danage as mcasuredrgainst &e crftffia oithis secuon- ftc $ docr "","L.o rhcprcsencc of poorty&ained sols cxcepr fq rhc'nderlying dur ;ilil;;r.susccptible o,rarnagcfr'oo crtlrquake, erc- Th; dlF;" to stebilizc rhs sirc berow rhc top 20 a 40rnchcs' rndir::e.' ap!'eort"r *y.pouftrrr"p.;;i,,T. could only gcgrnia rtrcsurficid soilc if at rri.'ias;;"-* ;in *ar,t d;liilrru. rhat thc site corrainsany fills, high mganic con*nr *fu, perr, orpstlandslide dc's.
3"T::"Ts1:ffiTf, fl tffiffi $;u"*HTffi3trffii:ffifiHazardous Arca* prease .-tl r- if t;;#e qucstioas ,g*diog this rccer. I would beHru:rKH#l * ilirlJ" *"Ja dh. ,; ;; ;"*;ifoir condidons orveciry
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h-t"*ilrt- ccveloP*nr cuvirrcs etict qatd rcd,rcc +..gd rvrrcr ronrgc yer'rsffiTffiffinnl:ffirsrffiHstr
?' Tb qplic* strll dcdjr rrch coo'GEsrbrt $q! fSiliria a 5. or crc-d cunar rrud.,& endtrfffitrffimff ffi. Mruud a" o.i# !o*a a".io,
3. Tb. epplhrnr rtell providc r Im!-cr:nr urinrrncc plea for $orryt f_jlirias.a. IfcodidoElwtsr*'il de;trffi.?r?.ffi or trrv ctbr* tr ,.&c o'cr roar.,G.r' Drbl'ro€
5. For dorrutopclr ectinitirr ccuriar itr dr_ .d- ,!^ ^_ .-rtma.or *dC ;,iTiEoffi,[}* 'qe' thc qplicut lbrn cat r in.o r .f,ord{rrrrrs.
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Ap3ti€urr 6rrll erdopur tocrd.rritib !:qrgUy llood*_r9r dtotcriricd dairyc co,nidcs$rII pq-e 'r*+'dn*lE*gilg1-1fiIl oarr.n*r-*';; .rrard b"tff-
a'opoa * o ;#fr;. rqrcd -tl'o-ffi.,o - artry. "o*Jii €ee Frc*rnc
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3:t::*lll ! dcfi!.d oo.r si.. spcift hdr wirr srrbectr rlbdcd bstE lld off-ritc. Geerrlly. UA{i J""6"i* b tcse rheo 2f frct. $orat lifc &d proFrrt borboo-
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3. Aay rtr pocadrtly sbjcct b rus qrycg3lr drrc 19 r coobb*hvdrotogicfi.Lrs. r,riaor tioiea .o dr;; e.FFd., d-'ifrfflHl"#ffir#ttc wrsbbgldsue Dcptucilof Eroiogy, D.p.d., of N;aJicsourEar or u.s. eorqicscnricc.Ttec crrssifieedms ori u" hr;;il; s,.adrnrr tuh.( ,* Erppirg.
l; *Ht.o"dtyu*rblc rs e rc.,dt of npid strrn i$isiq!, s!!rr b"ot .,adou, on udrrurrh3
S. t\Dy slope of forty pcaar (t(l*) or s@cp.".
C. t4rdrlrd nrdonucar
. t. Scidc IL.fo Airs iE pon Tor' d-. .*.-; nLict rrc Gcilrd umy ia rrces or fiir. nrch rs po.rriocr of tc
2' Purnro r thil cbaptar, ew dcvclqp:ot or rlior:siors ? ,r:p slopcs. h[4di&, emrioo h.2rrd ortrtrhHitr;Htri#:ffi il.rffi s*d;l,,'od;
D- Scrfonuno Slrdlr* forDcvdopcar
f. Smdrr& fm*btcErll{ Ant
L sudirds for &wtopar oftrucurqr Ed itrFror€ro.og in ods-io hrz.sd rrcrs rtrll beis *corduca ei6 Qp rn*itt*" i"-tL ultffira, c-Jinilr?n a b, tu eiry;ffiffi|' li' edditioJ -d"fi;;t'E;;;;;l -;,-" b resur,b
' b' eiq{ icrid.. *ett aot b' l(rrlcd ia rdoic I3.d rrais unlccs Eirittria bhll ba# ." rlo popoccd dFrd;ffi; srrbh .s if ir *Grr; bcilld rritua r
*a Strg Slof.t,I&&lida.rd ErudonErzrrd AratDcvcloposar o4.il6+ rlopcwi.hliI;;-;;;;;;rr rhzlrcoaprywirt rhc fo*a,iu3pcrforuracaffiffiffiX,ffiffi1r:**-* t"a-'r".r6"il^Erioos, bnrc6, de'clopoor rocrdoo,
'' P:rforanmo smdtdr fotstornrrrcr comtol, rrrhrrcdqpar crced r5ti with iqpcoarbleroih. rad b rlt aotion hrrrd rgs, rbe .ggiicrli.ar; d.r"lory tl tc uporuy rrd fiuriqro'"-u io a{oDt nraofisrrr gdlit',il *d- rd rcdiusrioa iacorpoeuamcccoatrok lert MrorFt frra;c_, -dd-,G;;rd
dr|nr&riog cquuls thil rltl lor.8g*ilrs u crirria3 prcbloo or qu!. r l', poblcor b oacrr.
b. pcrfrrnlnce Stradrds for Erocioa Cauusl
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