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RETAINING WALL GEOTEST SERVICES� INC. <br /> OBSERVATION REPORT 741 Marine Dnve.Bellinghem,WA 98225 Phone: 360.733.7318 Fax: 360.733.7418 <br /> PROJECT: Baldwin Residence Wall JOB#: OS-5233 <br /> ADDRESS: J206 Wave Drive, Evertt,WA REPORT#: S70 <br /> CLIENT: Larry Baldwin DATE: 10-24-2008 <br /> CONTRACTOR:Larry Baldwln PAGE#: 1 of 1 <br /> WEATHER: Cloudy,50° PERMIT#: <br /> INSPECTOR:JB <br /> Observation of: ALLANBLOCK� MSE Wall <br /> Wall Type:Up l0 10'Allan Block(9 MSE Wall <br /> Wall Locatlon: Northeast corner of the residence. <br /> Report Referenced: Allan Block Wall Replacement, Baldwin Residence,dated 6-3-2005. <br /> Flnished Wall Dimensionn: The lower wall is-80'in length and decreases from-9'high(from bar>e block to top <br /> block, 13 blocks)al the noAhern edge and curve and step up slope to 4'high at lhe soulhem edge.The upper <br /> wall is approxiniateiy 50 teet in length and approximately 7.5'high(11 blocks in heighl). <br /> Location(s)Observed on this Date: Both Ihe upper and lower walls have been finished at lhis time.Since our <br /> last visit the contractor fnished building the upper wall to it's finished height betore finishing ihe southem section <br /> of the lower wall. <br /> Subgrade Condition: A 3I8"poinled steel rod was previously used to probe the nztive slightiy gravelly,sandy silt <br /> (glacial driN)exposed below the both retaining walls. Native soil was determined to be in a medium dense <br /> condition and suitable for wall consiruction. <br /> Leveling Base Comments: -6"thick leveling base consisting oi crushed sandy giavel(5l8"minus)was <br /> observed in place over native subgrade bei,�w the upper and lower wa�ls. <br /> Drain Pipe Type:4"diameter corrugated black drain pipe was present behind the lowesl course of Allan blocrc tor <br /> ihe lower wall. A 4"white PVC pipe with periorations oriented downward was reported by lhe conhactor to be <br /> pre;ent behind Ihe upper wall. <br /> Drafnage Layer Comments: A G"-12"thick layer of 1"clear crushed rock is in place immediately behind the <br /> upper and lower wall blocks and separated by filter fabric from backfill mate•ial. <br /> Geosynthetic Type: SWR 7 series geogrid. RepoAed by contractor to be equivalent fo Mirifi 7z. GeoTest <br /> recommends a minimum of Mirifi 5x or equivalent. <br /> Geosynthetic Placement Comments:Observed to be pl�ced in fiat and unwrinkled in Ihe correcl machine <br /> direcliun and eztend 7-712'back from lhe wall tront. <br /> Backfill Placement Comments: The contractor used gray,crushed 5/8 minus rock as backfill behind the upper <br /> wall and the southem sec�ion ot lhe tower wall. <br /> Wall Face BatterlAngle Comments: Not Applicable <br /> Complfance with Design? Yes <br /> Additional Comments: Separation betweer,!he upper and lower wall fronts was measured to be approximalely <br /> 14(eet.We recommend a minimum ot 10 feet sep::ration be maintained. <br /> Copies: Client <br /> SutmiUed By: <br /> Grant Richardson <br /> Technical Director <br /> .n�....,..n .++p�n�r�..,....��nw� .w.nr��:.0 n�.,�+,...c.�r1��s�rpwl6hB�I�ro1bBreN'����e.capimh�ll wi1hw11frtwiRlene{+ptove141GBOTef15mKle IiK <br /> � Tno aCcve imt resens iaia�e eny m I�e sampie iw lorauonl�es�aG CepyriaM t 19!'l GTS <br /> i� i . <br />