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October 14 2 009 J C i t y 9 of Eugene Contract #2009-00229' <br />Exhi A - Scope of Work <br />Ms. Jenifer Willer, PE <br />- C ity of Eugene <br /> _ pia email: jenifer.m.wil ne.or:us <br />R: PROPOSAL F OR GEOTECHNICAL ASSESSMENT CRE DRIVE PROJECT <br />Dear Ms. 'Willer: <br />I and meriting this letter to present a= ro osal torfoiyrn a eoechnical asses <br />p * p • p g asses of Crest Drive <br />Stored Boulevard, a rdl Street area proposed- forn�proeerits. The r osal is based <br />on our knowledge o the area from l ted o er at r s, at other•prgje�eets ini the v c'ru a curs <br />review of histofica.l aerial photos. Base. ed on this, vex - �rnited� hifbrmatioA,, , it app ear' that min <br />portions of the pro , ect are located �n a ea derl.ain by' - rthfo ' type Slo movements which <br />eons st of high -1 quidwIirnut clay to d pth . ranging fern feet to tens of feet. These soils tend to e <br />highly expansive and creep downsl�ope as a result cif �ea�ona� nloi�ture chap e . <br />gs <br />The area is urbanized and the - s are:ex•istiji g, a lthout .h. no records regarding the const ructio <br />g g n Ave <br />presently known - to h available. T`he } <br />project invo rec n trh t on .of the roads addition o f <br />sidails and drainage lrn�rorernex�ts* eoSoience's ral intended t :aid i t F <br />he delineation <br />o`f`D+slg areas "thi the project, boundaries -, ithijj• which soil characteristics <br />and vert <br />distribut.ion is relatively constant. Recommendations will e <br />b prepared for each Desi Area <br />regarding road prism canguration, subrade: treatment end conce tual road section. <br />The. expected s" f cant.. variabi t i coinbinations, of s e <br />lop , existing road desi gn, and X011 <br />conditions warraftts -sub urfac e r tioh:at numerous locations. Thy a yam a� .-ir�� • ma. sh �s <br />� <br />� Y g � o <br />the initially propv ed locations. borin : - locations will be determined after a rr <br />g ore thorough <br />rev iew of historical aeri al ph6tos. and b a sed o n eons hic f � l• <br />g . rp .e v' edence* In m cases, the <br />required. depth of exploration is not ;expected to: exceed 5.to 8 -feet. , ln�: p lace ; high-bearing,, F �� aril_ <br />Y <br />decomposed rock is expected to be encountered within�this -de thi s-depth ran e. It is also ex ected that o <br />. p . p �Y <br />m portions, any. of then --tae roc are s competent toes non conventional <br />m eans ofexcavation., Due to the lilted width o�th� roads.a�d resi�er�tial riot re.ofthe:area .drill i <br />• <br />i t mec hanized,equip ' � <br />w ould closure of�one lane tragic control, Iu addition, the <br />large number of Oo ints to be investigated would. result in large dr llin costs. As a re ult <br />g s of these- <br />considerations, GeoScie nce. proposes to conduct most of the subsurface •e loration hsiri - a 2-4/4 <br />p g <br />inch OD hand auger capable ofre depthso up to felt. l3orin locatior m ill lie deter�ihcd <br />g <br />using a tape measure from known la <br />In additi to the 'low impact and. space re .uirements o� using. hand�o crated e . ui <br />q p q pme- nt. ;another <br />. dvahtage is tha the vertical- Loca tions pfsoil /rock contacts can be ide mif ed o , e:a (with nz � ec�.rat��y <br />-1 oths of feet rather than feet). <br />Eugene (541) 607 -.FAX 607. CCB #'12'7073 <br />