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! <br /> ti 9 . Pne try mCer; <br /> FIELD RLi'ORT 1290.08-06 <br /> 5 Geo 1�Engineer -f� AD,e,: tae: <br /> A � 1 2405 - la0th Avenue NE 9 Hambrook August 18, 199 <br /> Bellevue, WA 98005 <br /> q rr r O^^eC Fepon Num Den <br /> yy ta (206) 746.5200 Northstar Dev. 65 <br /> I•-! C X Ig r,,.Pred eY IOC.Vort Wnvel: For e: <br /> TTTy... Brad Biggerstaff Everett 9:15 1 of 2 <br /> F`vrocee of Mew. weelMc oep.nm e: Perms Numeer. <br /> p�y�tl y p.l i� C/M Fill control Cloudy/rain 60 1205 <br /> [Tf O , <br /> H I <br /> O lry� The site was visited at the request of Mike/Cary Cunning to continue <br /> H• n ti monitoring of fill placed north of A-line frow station 19 + 00 to 22 + 50. A <br /> Zy H nuclear density soil moisture gauge and observation of heavy equipment (loaded <br /> t" scrapers) were used. <br /> gti H Fill material in this area consisted of 2 materials: a brown fine to med. <br /> n to sand with gravel and trace amounts of silt and a browIi silty fine sand with <br /> minor gravel. Both materials were estimated to be at the optimum moisture <br /> content. A minor amount of a reddish-brolrn fine sandy silt was placed as fill; <br /> O y contractor (Sumas) was advised that this material was below opt, moisture and <br /> should be mixed with the sandier material or have water added. This material <br /> appears to be the oxidized soil just below the topsoil horizon as it also <br /> j contains root and organic material (less than 3 percent) . <br /> Based on the results of our nuclear density tests and general observations, <br /> it is our opinion that the current method of placement (3 to 6 inch scraper <br /> 1 lifts compacted with the double sheep's foot roller followed by loaded scraper <br /> compaction at one foot intervals) is providing adequate or compaction of 92% MDD <br /> (ASTH D-1557) greater than 2 feet bellow subgrade and 95% MDD (ASTM D-1557) <br /> above 2 feet below subgrade. <br /> The current slope (3:1) in this area is temporary and may be steepened to a <br /> 2:1. Cary Cunning was advised that this would have to be done from the bottom <br /> of the slope and keyed into the existing slope in order to achieve compaction <br /> �1 ) requirements. He is aware of this. It was recommended that the existing slore <br /> to the south be keyed into during the current fill activities. He indicated <br /> g that this is being done and will advise Sumas that it is time to cut another <br /> 1 1 key. <br /> Activity south of A-line (16 + 00 to 17 + 20) today was restricted to dozer <br /> cuts of the existing fill to fine tune the grade. Following this, sandy soil <br /> will be stockpiled in this area for use later on the project. Contractor was <br /> .�� advised that any disturbed areas or soil stockpiles should be rolled to provide <br /> a cap for water runoff and prevent the soils £rola becoming saturated during <br /> possible rains. <br /> Mike and Cary Cunning asked me to observe a cut area on the west side of <br /> the plateau adjacent to the slope above the park where setback concerns exist. <br /> ! I observed that an approximate 3 foot concrete cap had been cut back about 6 to <br /> 1, <br /> Me repon pr.I ems oPINone formed es.roe a'1 DI ne oGu,.,I.nf 0 aonnlee Iell Vng to geotrc Niel engineering. We rely on Ne Contractor to co mpty wNl Ne V4 % <br /> .nd epef10U11Dne WCVgf1D ll the dW01.0n of the prole,I..Mpe[live of Ne prnence of DV repreeenll Vve. eW..14does not NCNCe fupern Von w due,mn of the <br /> e,WI work of Ne Comkow.Ns employees W.gems. oW Hm mo not be reepons101e 11 job or.Ile solely on IN,project. <br /> Attachments: <br /> Distribution: Siyned• <br />