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Home My WebLink About701311021 Geotech Assessment (1993) I ~! . ,;, Ii.! ...., ..;' 11; ,. . 1; t ':' ! 'i(; lif!-:;.I. ..1".. lt'l !. , - ::')'1. .,,'Il . ~~ !:.', . . ~ ~ ~ ;' i :,;1 I: I ' , . I I:" . ~' i " , SS/17!2002 10:55 ---- -...- -- - --..... _...~ -"''11 \I.;I~~ ",.....~.1 ........... ,1........1..1.1...0'-'.1..1. .L..I.n........ ...,.L..... PAGE 02 3507653122 WINDERMERE HOODCANAL NORTHWESTERN TERRiTORIES, INC. FI L:',.E or .~1u& ~ j?J maAA- I~,- Engineers III LaM ~s III P1Jnners CtJn5fruction Coortfination all Maf6rla/s TIIsllng .------ ~-- SLOPE STABILITY EVALUATION GUSTAVSON SHORT PLAT --~- ..- -~ Lot 3, Pope Resource Subdiv~sion of Government Lots 1 and 2 ' Section 31 No:rth, Township 27 North, Range 1 West" W .M,. Jeffer~on County, Washington " " . " 'f " , ' \ I II: '. " Prepared. for GLF.:NN O. GUSTAVSON " I., Prepared by NORT.HwESTERN TERRITORIES, INC. . , I , . ", ' \ ".. ' AUgust, 1'993 .'.' . 711 SOUTH PE,ABOOY. ,PORT ANGELES. WA 98362 ,(2DI)) 45?-aQ91 Hl1JD~54.SS45 fA)( 452-114911 . I " AN INOfPENOENTt '( OWNEO AffILIATE OF BECKER INVESTIGATIVE EkGlliEEAtilG CORP "IWIV..,...., 'rI.L. c.. "- '. ) I !. , ?~/17/2~a2 18:56 3667653122, WINDERMERE HOODCANAL PAGE 03 -'~ SLOPE STABXLZTY EVALUATXON SCOPE ,AND PURPOSE Our evaluation of bluff stability was reconnaissance in nature and consisted of visual observations by Mr. Blase CylwiK, Engineering Geologist. Observation efforts included traverse of the bluff slope, shoreline and upper ar.eas of the property designated for residential const:ruction. No subSU:t:'face, exploration was performed. The purpose of our study was to provide information concerning the proposed division of the property into three residential lots--Lots A and B west of QuU,cene Road, and Lot C east of the road. Por- tions of Lots A and B are also present east of tbe road. Our study concerns that portion'of the property lying west of the road. paOPERTY DESCRIPTXON The property proposed to be divided is near the south terminus of the Bolton Peninsula and consists of Lots A and B that extend about 350 feet west of Quilcene Road down to Quilcene Bay. Each of the lots are 150 feet wide except that an area of ~out 200 feet by 200 f~et and another of irregular shape about 600 feet l.ong east of the road are portlons of Lots A and B, respectively. These areas are to be used for septic drainfields. Lot C lies east of these latter areas (Figure 1). REGXONAL GEOLqqy ,.', . The bluff and property to the east are underlain by massive but , ',highly ~ointeo grey to brown, well consolidated siltstone of the , , rwin River formation that ~s of lower Miocene,~ge. This formation , ': is overlain in the upper, bluff and portions' of the' property by poorly sorted sil t, s'and and gravel sedimen:ts. These sediments are of glacial outwash o:dgin and were deposited over 10,'000 years ago. They are generally dense but are not well consolidated and rela~ tively p.ermeable. The bluff has been formed by marine eros,ion and underc.utting along the shoreline; resulting in oversteepening and subsequent periodic "downward movement of bluff materials by erosion, slow creep of surface ~oils and slumping. In general', the rate of avera.ge annual bluff retreat can vary from' a few inches to several feet. In this , t., . , ",I Y.f ....i'f ""YV\I nLJU .&.OJii"~ &.t'1^ ,,*G:.J "*~V Q'.J""~ l..;:~L;Y OJ:. .r.."IlL;QU .t=iX"G VJ:.G Ii&IV \I ~( \lJ.G ~3/17/2002 10:56 3687653122 WINDER~RE HOOD CANAL PAGE 04 areOg the bluff does not appear to be aggressive marine wldercut- tins, pe:chaps hecause of the relatively firm siltstone and protec::'~ tion afforded by Quilcene Bay. LOCAL CONDXTIONS The bluff area along Lots A and B is 75 to 100 feet in height and has an overall slope of about 37 degrees. The slope is densely tree and brush covered. Most of the trees appear to be second to third growth. Over most of the bluff tbe tre.e.s sta.nd nearby vertically indicating surficial and grass slope stability during their growth. A landslide is present on the bluff between Lots A and B (Figur~ 1). The base of the landslide is about 100 feet wide along the shoreline. It narrows and e~tends to nea,;r the top of the blu.ff. The slide probably occu~red over 50 years ago and appears to have, been subject to slow downward creep since that time. The landslide probably was caused by a combinort.ion of adversely oriented jointing in the siltstone; erosion alony the ravine and over-steepening of the bluff by marine erosion. The base of the landslide is seen In Photos 1 and 2. A shallow ravine extends northwest from Quilcene Road across the northeast corner of Lot B and western slope of Lot A. The sides of the ravine are b~ush and tree-co~ered (Photo 3). Another similar ravine e:xtenos ac,ross the northeast corner of Lot A (Photo' 4)_ Erosion Or downcutting in the ravines appears'to have been negligi- ble over the past at least several years. A shallow bowl-shaped' depression along'1;he :south side of the ra-v-ine .- in Lat B may represent p~~t shallow siU~P~~9 of soils exposed'by ravine erosion. Slumping does not appea'r' ',to be presently active (Photo 3). The large relatively ,level areas adjacent'to and west of Q~ilcene ,Road appear to be largely natural arid appear permanent as a result ,of having been ~ecently cleared. ' .cONCLUS:IONS (1) The relatively lev-el portions of Lots A and B west of Quilcene Road appear to be adequately stable to support residential construction. It is unde;rstood that septic drainfields for each lot will be east of Quilcene Road. ~ V.'L~'6VVQ n~u L~.6~ ~rt^ ~G~ ~~V QO~~ ~~LY Q~ ~cn~Qn OKCQ VLQ Ii{,JV v.,- V L G 2:/17/2002 10:55 3587553122 WINDERMERE HOODCANAL PAGE 05 (2) Runoff carried by the ravine down the bluff on Lot A may have been a contributing factor to formations of the landslide On the bluff. Howage~e the ravine does not appear to he aggres- sively eroding the slope or adjacent landslide. (3} The bluff appears to be grossly stable. 'the upper part of tile bluff above the landslide is relatively steep and may be subject to accelerated sloughing or erosion because of this. (4) The possible shallow shimp area along the ravine on Lot B appears to be stable and should not present a hazard if structural foo.tinge are founded in the underlying firm or dense earth materials. RECO~ENDAT:r:ON'S ( 1) Permanent structures should be located a minimum af 50 feet back (east) of the existing top-of-bluff edge and 25 feet back of the top of ravine slopes. (2) Structural foundations should be founded a~ least 18 inches intQ firm or dense in-p'late natural earth materials. Addi- tional considerations may be necessary if any fill or loose soils are encountered adjacent to the top-of-ravine banks. Septic system drain fields should be located ea~t of Quil~en~ Road as proposed. (3) (4) Sloping areas along the ravines and top of bluff should he . planted with deep-rooted ground COVer to minimize erosion and ,s.urface sloughing. (5 ) Runoff from roof downspouts and paved areas should be co'n,.. ducted via lined downdrains to velocity ,dissipators iri the ~l,o,wl~~e of existing natural ravines. STANDARD DISCLOSURE STATEMENT This .report is based o~ a visual inspection of the existing site condit,ions. ~o scientific'measurements, te.sts or calculations"were perfo'rmed. . The finding-s and 'report are J,imi ted to the I).or~al stand~rd' of care of the industry for an. investigation without benefit Qf scientific data and calculations. Unless construction plans are reviewed and the can~truction work is inspected by the Engineer, no w~rranty is made by the En9ineer concerning conformity of the construction to the conclusions and recommendations of this, report. ' , , The .sole ooj'ecti ve of this inv~stigation has. been to diagnose. the geotechn~cal conditions at the site. 'The report has been,pre~ar~d, for, the exclusive use of Glenn O. Gus'taV$OD and may .be us'ed..;.by others only with eJepressed written permission of th~ Enginee'r,., 'The ...-...... -...... -~v v.......", .......L.L.ox ....,..... ..."....L...L.oVL... ................. ............ """......, .. -- 29/17/2002 10:55 3667b53122 WINDERMERE HDDDCANAL PAGE: 06 ...... : I'." . report has not been prepared for use by others or other uses. The obser~ationsl interpretations, and conclusions nerein are based on generally accepted professional engineering and geologic principles and practice. This warranty is in lieu of all others, either expressed or implied. 5~ -s-: "1_" il. ',',"' fc: , :Dir: ] G1..1stvsn.Rpt Eng/Rpt. I r J ( i [ I I ......non. .". ...,\1 ftJ-..;~~ \,r..L.L..J Y..... ..."'....&.1.""...11.... .,L.I.l'Io"''''' ...,......... ..ulll'.'" lII'__ Z:S/17/2082 18:56 3687653122 WINDERMERE HOODCANAL PAGE E'l7 :.........,~ ThO ~. , I : _ ~_ J ; I .-" j : . !-- _.).- ., r . :. ~. .-... . . ! . : ~ :. . . -.- --... .. .:..~~~'.:' . ...,.1.. ~.~ ,,0.: ~ I . . ""T"!' ~.- l'i- I. 1-' ,. . ., ..... .', _._. . .. . (j\ , .-.j :.:;..:.:.'::-~! i. -- ,-_... .,.. .. -.... , , ,,- ..-- -.. . , ' .---.. .. .,....:, _~.. I .. . _ . . ..'_#0 .-.- ,. .. .;.,.::~; --i"~ .....: lfi ''1' ....f ' :[ 0. .~., '. t' '- ;.... ; . j .:.. r t,._ , .j. , ; ! 'ii(;,~E I . . $ T R. .fD)l.TE: It' 'S'E~Tj l' , , gESIGl'ieD BY: 'PUi '!~ C't'l.j,Jlk,'7~4. ~ N.ORT~WESTERN TERRITORIES~' INC.', . "" (;.U"r~tlS"N . " PAQJ~CT : s:P. It: e:-/:I '1"&0 . Eng/ltHrl.1.md S-vvrl .1f211"m ,'FOR : GUN 0, l;.vrr;lf" r,,1'II 1m t:DfUlmcllDn CMtdillltitlll . ",.flrlilr r,&fJn, sm. I OF /. n r SOuYH peFl/lOO't'. POFll HlGE1ES, W,lSllINGTOH 98362. (106) 452.8491 ., OQfl~f200e WED 1~:2Q FAX Q2~ Q~O 652~ City ot Renton EXeo Qto ~VVIIV.l<: ?:/17/2002 10:56 :3(;07653122 WINDERMERE HODDCANAL PAGE 08 i\GRTHWESTERN TERRITORIES, INC. 717 SOUTH PEABODY STREET PORT ANGELES, WASHINGTON 98362 NTI Engineers III Land SUl"Veyor~ &! Geologists ConstlWflon rnspectlon .. Materials Testing Phone (360)452-8491 iii Fax {360}452-8498 1-800w654-5545 E.Maft: info@nti4u.com ..l. """"""/if".r'",, TO: Glenn Gustavson PO Box 609 . Quilcene, WA 98376 DATE: January 3,2002 A'TfN: SUBJECT: Slope Stability Evaluation i WE ARE TRANSMITTING: IKI One copy of the Slo~ Stability Evaluation dated August 1993 for Gustavson Short Plat lOcated , in Section 31 North, Township 27 Nort~, Range 1 West, W.M. Jefferson County, Washing~on; , ~, ':. '. i .' I~EMARK;- I ' If you hav.e any q~estio,ns, please d.on't hesit~~~ tq give u~ a'calL I. . " . ',' , [ . " "', , ' " ' . :~hese are: For your Use. Sent via: U.S. Mail Signed).R: Jerrv Newlin. 'P.E. by D. 'Wesf , .' \' " t \ " V~~~ ~~~~ v~ ~~~~4~V~4 ~~W~ V~~ '110&I' . .. f . -... ~:/17/2e02 1I:J: 56 3607653122 WINDERMERE HOODCANAL Pb,GE 09 . . .; , NORTHWESTERN TERRITORIES, INC. 717 SOUTH PEABOOV STRE:ET. POR1' ANGELES, wA9113ll2 t:ng(neG($ JlI t.end SlifVeyO{$llI P/",.,,,enr. CllnslNcrlon Coordln~ion ~ Maler/els Te::llng (3QO) ~-M91 1-600-654-5545 FAX ~52-1!49!l E..tJlall: Info@nll4u.com NTI CONTRACT FOR SERVICES 'WWI&.Iltf4u. com THIS CONTRACT Is made I.f1ls W" d~y IOf Janua!'Y, 2002, belween GLENN GUSTAVSON. subsequently referred to as "Client," and NORTHWESTERN TERRITORIES, INC.. subsequently referred 10 as .Consultant" 1. PROJECT, By joining In thi$ Contract. Client retains Consultant to provide Geotechnical Services To Updata Slope Stability Evaluation, in connection with Lot 3. Pope lReSOUTcelil Subdivision cf Govt. Lots 1 & 2, subsequenlly referred to as pprOJect';" located on real property in Section 31. Towrllihip 27 North, Ralig$ 1 West. W.M., Jl8fhlrson County, Washington: Client's relationship to said real property Is that of oWJ'\er. 2. SCOPE. By tpis Contract, the scope of ~nsultant's services on this Project Is limited to: OFFICE RESEARCH, SITE VISIT. UPDATE REPORT S. s.STIMATE- Consultanfs estimate, for Client buage!:ing purpOses only, to provide services covered by this Contract: 55QO.00 - $7'01).00 PER ATTACHED HOURLY RATE SCHEDULE. '. If project requfrement$ or the conditions encouotered indicate thatthe scope ofservices covered by this Contract shculct e~ceed 10% of the amount provided by this Contract. an additional Contract for Services or a written Addendum to this Contract may be Imtered into to cover the revised scope. Should Client verbally authorll:e a revlsiorl in the scope of services without a revision to tt:'is Contracl;, Consultant shall be compensated by Client for services actually perfonneCl. 4. p~POSlI. Cortsultant's receipt of ,B50.00 . along with this Contract signed by Client, shall constitute COnsultant's authorization to begin work. . 5. PA YME!'IT. Payment for services actually perfQITlled Is due upon receipt of monthly bi.IliJ'lg for actual labor times and expenses In accordance with' Consultanfs current rate schedule. Finance 'charges wlll be imposed on unpaid balance 30 days a.fter date of monthly billing at the rate of 1.5% par month. Work will be put on hold when past due balance reaches 45 days and will commence when balance is paid. The Glle,nUs hereby notified of Consultaot's'irnentlon to lien the subject real property for the collection of any Llnpald balancas w1ttlili 90,daY$ofthe date the labor, materials. services o(Elqulpment were furnished, or at such time as.any unpald:balance is 90 days past 'dlJe. whichever com6$ first. In accordance with the Revised Code of WashiOglO~. . S. This Contrac,l ~hall be binding upon the heirs, executors, administrators. success.ors and assigns of Client and Consultant. , , . 7. If any adtio'o at law 01' equity, IncludIng an action. for dect~ratory relief. is brought to enforce 'or. interpret the provisions of this Conb:act,,~e prevailing party shall be &I'lititled to reasonable attorneys' fees, .which fees m~y be set by,tlle coUrtin1l1e same actiofl or in a separate action brought for that purpose. in addition to any otnenelief to which he may be, entitled. At the option of ttu~ Consullant. place of venue shall be Clallam County, Washington- .g, The Consultanlshall elCercise the normal and accustomed standard of care expected ofsimllarty situated professionals'practicing In the community in which the COnsu~t is located. The Consultanfs professional liability for'thiS' project sl'lall be limIted to 150 percent of the fee, This limIt may be increased for an additional fee, if requested by the Client. 9. This Contract shall not be binding if it is nol sIgned and returned to Consultant within 60 days of the Contract date, -? AUTH06!ZED Consultant Clle~ By: . (3.r.~ ~ ./~/5-~.;t,By:... .. . s;.oc J, R.,Jeny, Newlil\, P.E_. (Date) Glenn Gustavson, owner (Date) Principal EngIneer G:IGl!:nUlMllnlClIl1lraCl:;\2OO'1',lg\ Qusrter\GUSGD201 J1r..wj)(l 04/1$1/2006 WED 15= 25, FAX 425 430 6523 CH~ ,of Renton EXec Ofc , '" !li,: '09i20i213132 15: 09 36El4528498 'I, NTI " , UPDATE GEOTECHNICAL REPORT For GLENVlEW SHORT PLAT '~""'. / \ I " Located in (~~n Section 31, Township 27 North, Range 1 We$!, W. ~ Jefferson County, Washington Prepared for GLENN O. GUSTAVSON Prepared by NORTHWESTERN TERRITORIES, INC. 717 S. Peabody Street Port Angeles, Washington 98362 January 24, 2002 04/1~/2006 WED 15~25 FAX 425 430 6523 City Of Renton.Exec Ofc ~010/012 , 8S/2e/2882 15:89 3684528498 NT! PAGE 8:3 January 24, 2002 Glenn Gustavson PO Box 609 Qullcene, WA 98376 Subject Update Geotechnical Report: for Lot A, Glenvlew Short Plat in Section 31, T 27 N, R 1 W, W.M.. Jefferson County, WA Dear Mr. Gustavson: At your request, Bill Payton of Northwestern Territories, Inc. (NTI) met with you at the above location on January 15, 2002 to conduct an update geotechnical inspection of Lot A. It is understood that you plan to sell Lot A. and that this report will be used to satisfy Jefferson County's requirement for a geotechnical report. The original report, completed in August. 1993 by NTI for Lots A, Band C, is included with, and made a part of, this update. The update geotechnical inspection consisted of a visual inspection of the lot including a traverse of the bluff and beach via a pathway down the face of the bluff to detennine if there had been any new slide activity since the original report. No evidence of further instability was noticed and thus, the conclusions and recommendations of the original report are still valid. The following recommendations should also be considered wtth regards to development of the subject property: 1. Heavy irrigation or other activities that would contribute large Cluantltles of water to the soil should be avoided. One cause of landslides is the presence of excessive groundwater in the soil near the bluff. 2. Runoff from roofs and other hard surfaces such as driveways and decks should be controlled and routed to a detention basin, dry well, other drainaga control device or to the existing natural ravines such that surface water discharge or sedimentation to adjacent properties will not be significantly higher than pre-development conditions. The water should not be infiltrated between the house and the bluff. An engineered drainage control plan should be developed for this property to address these iss~es. 2 04/19/2006 WED 1,5: 25 FAX 425 430 6523. ~Hy of Renton EXec Ofc , . 09/20/2882 15:09 3664528498 NT! , . , , . . 3. Septic systems and/or detention basins should not be constru- between the house and the bluff. 4. All drainage control devices should be maintained in good war and inspected at least once a year. 5. Silt fences or other sediment control devices may need to be L orderto prevent sedimentation to adjacent properties during c. Based on the findings, recommendations and limitations of this reporll 1. There has been landslide activity on the bluffface in the past, . the report recommendations should provide for minimallandsl. to the proposed home. 2. An analysis of slope stability indicates that the proposed home be ~ubject to risk of landslide under nonnal conditions. 3. The proposal would not increase surface water discharge or sedimentation to adjacent properties. 4. The proposal would not decrease slope stability on adjacent Pi 5. The proposed home site would be stable under normal geologi conditions. Limitations This report is based on a visual inspection of the existing site conditio. major catastrophic events such as earthquakes or abnonnal weather .. No scientific measurements, tests or cafculations were performed. TI"III and report are limited to the normal standard of care of the industry fo - investigation without benefit of scientific data and calculations. The safe objective of this investigation has been to diagnose the geote conditions at the subject pro'perty. The property may be affected by re,!!! pertaining to issues such as wetlands ,or wildlife habitat that are not acJI this report 3 0.'1./151/2006 WED 1~= 2~ FAX .42~ 430 6523 City Of Renton ExeC Oto a9/20/2002 15:09 35a4528498 NT! The report has been prepared for the exclusive use of our client in conjunction with the above referenced project. It may be used by others only with expressed written permission of the Engineer. The report has not been prepared for use by others or for other uses. The observations, interpretations, and conclusions herein are based on generally accepted professional engineering and geologic principles and practice. This warranty is in lieu of all others, either expressed or implied. Sincerely, NORTHWESTERN TERRITORIES, INC. J. R. Jerry Newlin, P.E. Principal Engineer I EXl'IP.CS Bill Payton, L.E.G. Engineering Geologist G:\Gen\BiII\Reports\GUSG0201.btuff stabiHly.31 (27-1 ).8oIt0ll Peninsula.doc 4 IjZJVJ.~f VJ.~ PAGE es