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RETAINING WALL GEOTEST SERVICES� IN�. <br /> OBSERVATION REPORT 741 Marine Drive,Bellingham,WA 98225 Phone: 360.733.7318 Fax: 350.733.7418 � <br /> PROJECT: Baldwin Residence Wall JOB#: 05-5233 <br /> ADDRESS: 3206 Wa e Drive,Evertt,WA REPORT#: SOB <br /> CLIENT: Larty Baldwtn DATE: 10-15-2006 <br /> CONTRACTOR:Larry Baldwin PAGE#: 1 of 1 <br /> WEATHER: Cloudy,50° PERMIT#: �; <br /> INSPECTOR:JB <br /> Observation of: Al_LANBLOCK� MSE Wall <br /> � <br /> Wdl Type: Up to 10'Allan Block�)MSE Wall ' <br /> � <br /> Wall Locatio�:Northeasl corner of the residence. <br /> � <br /> Report Referenced: Allan Block Wall Replacement, Baldwin Residence,dated 6-3-2005. <br /> Flnished Wall Dimensions: The lower wall is anticipated at this time lo be-50'in lengih and decreases from <br /> -10'high(from bas��block to top block, 13 blocks)at the northem edge to 4'high at the southern edge.The upper <br /> wall is anticipated to be approximately 11 blocks in height at Ihis time <br /> Location(s)Observed on this Date: The northern and central sections of the lower wall have bezn built, � <br /> back511ed and compacted to a 73 block heighl(-�J')at this time.The height and length of the southem section oi <br /> the lower wall has not been determined by the conlrador at this time.The�ipper wa�l has been built and backfilled �) <br /> to an approzimately 6 block h=ight. <br /> Subgrade Condition: A 318"pointed sleel rod was previously used lo probe the native s�:o�htly gravelly,sandy silt j <br /> (glacial drift)exposed below ihe both retaining walls. Nalive soil was determined to be ir,a medium dense <br /> condition and suitable for wail construction. <br /> Leveling Base Comments: -6"thick leveling base consisting o(crushed sandy gr:rvel(518"minus)was in place <br /> over native subgrade below ihe upper and lower walls. <br /> Drain Pipe Type:4"diameter corrugaled black drain pipe was presenl behind the;�west course of Allan block tor <br /> the lower wall. GeoTest recommended on-site for the conirador to use a 4"white F VC pipe with periora�ions <br /> oriented downward behind ihe upper wall. <br /> Drafnage Layer Comments: A G"-72"thick layer of 1"clear crushed rock was in place in ihe conshuded ' <br /> sections of ihe upper and lower walis, immediately behind the wall blocks and separated by filter tabric from � <br /> backfill material. <br /> Geosynthetic Type: SWR 7 series geogrid. RepoAed by contractor to br,equivalent to Mirifi 7x. �eoTest <br /> recommends a m!nimum ot Mirifi 5x or equivalent. <br /> Geosynthetic Placement Comments:Observed to be placed in flat and w�wr!nkled in the correct machine <br /> direction and eztending 7-t/2'back from ihe wall front. <br /> Backfill Placement Comments: The contraclor is using gray,crushed 518 minus rock as backfill behind the <br /> upper wall. <br /> Wall Face BatterlAngle Comments: NoY Applicable <br /> Compliance with Design7 Yes <br /> Additional Comments: Separation between Ihe upper and lower wall ironts was measured to 6e approximately <br /> 74 feet.We recommend a minimum of 10 feet separation be maintained. <br /> Copies: Client , <br /> Submitted By: <br /> Grant Richardson <br /> Technical Diredor <br /> .om..«i...rv..,M-n..M�.+v...:.�x...-u..e.•.nrs+•+�n�..:+�.s+aw�i��s�e(ro't sM1ell�ql�!repOOuce�e.cepl m lull w�itqul iM vnitlen e{Rrrvvel q GloTsst SenrCBt.Iz <br /> lne x^cve lesi resuns ielale only i.:Ine sam0�e�or h+cauonl restM('^y��a'�� ` 199J GTS <br />