3206 WAVE DR 2016-01-01 MF Import

RETAINING WALL C�OTEST SERVICES, INC. OBSERVATION REPORT 741 Manne Drive,Bellingham,WA 98225 Phone: 3F0.733.7318 Fax: 360.733.7118 PROJECT: Baldwin Residence Wall JOB#: OS-5233 ADDRESS: �206 Wave Drive,Evertt,WA REPORT�k: S07 CLIENT: Larry & Idwin DATE: 10-9•2008 CONTRACTOR:Larry Baldwin PAGE X. 1 of 2 WEATHER: Light Rain, 50° PERMIT#: INSPECTOR:JB Observation of: ALLANBLOCK� MSE Wall Wal�Type:Up to 10'Atlan Block�MSE Wall Wall Location: NoAheast corrier of the residence. Report Referenced: Allan Block Wa�l Replacement, Baldwin Residence,daled 6-3•2005. Finished Wall Dimensions: The lower wall is anticipated al this time to be-50'in length and decrease from-10' high(trom base block to top block, 13 blocks)at the northern edge to 4'high at the southern edge.The upper wall is anticipaled to be approximately 13 blocks in height. location�s)Observed on this Date: The northern and southern sections oi the lower wall have been buitt, backfilled and compacted to a 73 block height(-9')at Ihis time. The heigM and length of lhe soulhern section have not been deteimined at this time. Excavation(or Ihe fooling of the upper wa�l has begun on this date. Subgrade Condition: A 3!8"pointed steel rod was used to probe lhe native slightly gravelly,sandy silt(glacial drifl)exposed below the fooling oi the upper retaining wall.Penetrations averaged roughiy 12"and tl�e subgrade was detemiined l0 6e generally medium stif(in consistency.Near the middle of the wall approzimately siz inches of fill/lopsoil was present at ihe base o(ihe excavation.We recommend removing Ihis materiai and replacing with the crushed rock used(or the leveling base. Leveling Base Comments: -6"ihick leveling base consisting of crushed sandy gravel(5/8"minus)was in place over nalive subgrade below the lower wall. Leveling base was nol yel in place at the upper wall but should consist of a minimum six inches of r.ompacted crushed rock. Drain Pipe Type:4"diarneter corruga�ed black drain pipe was present behind lhe lowes�course of Allan b�ock for Ihe lower wall. GeoTes�recommended on-site for the contractor to use a 4"white PVC pipe with perforations oriented downward behind the upper wall. Drainage Layer Comments: A 6"-12"Ihick layer ot 1"clear crushed rock was in place in Ihe lower wall immediatety behind Ihe wall blocks and separated by filter(abric trom the wall backfill material. Drainage layer not yet in place behind ihe upper wall. Geosynthetic Type: SWK 7 series geogrid. Reported by contractor to be aquivalent to Mirifi 7x. Geo7est recommend a minimum of Mirifi 5z or equivalanl. 3eosynthetic Placement Comments:06served to be placed in 9at and unwrinkled in the carzect machine diredion and extending 7•1/2'back from the wall front. BackTill Placement Comments: Brown, sGghtly silty, gravelly,fine to coarse sand(pit run),was in place to 1he upp�•r mosl block behind the lower wall. No backfill was present behind the uppermosl wall.While on-site we observed ihe in-place mois�ure conlent of Ihe backfill was generally over-optimum and slighl pumping and rutting of lhe material was observed in areas of high foot traffc. Wall Face BatterlAngle Commenta: Not Applicable Complfance with Design? Yes Copies: Client � /J�l�/�7 � Submitled Byti%�j;��/�� Grant Richardson Technical Director .o�,.n..wv..ma�.e.e..vi. ..vw.�a - • .-•w.nTM1re repoH s�a��not M repodaceC e.ceM in WII.wilnoN IM nritlen eppovel W GeoTest Seniros.Ir¢ .. lha et�ove tes��esuiis re:a•.e on'.y�o tna semp�e icr Iccauon�testea CopyripM �.. 1993 GTS �� ;