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12l06/<092 11:33 14254'd12510 I�E1-S'ON GE�TEQ�NICAL PA(� eaiee <br />N�.�or <br />GEOTECHNICAL <br />ASSOCIATES� iNC <br />17311 13S'1'H Ave. Nb �MS�q <br />wa+a�nriu�. we 9ao7'+ <br />(425) 48fr1669 FA�X �8t-25 .0 <br />FIELD REPORT <br />projecC <br />Owner. <br />i.ocation: <br />vVeather. <br />Purpose of <br />Visit: <br />IS;vemmo itesidance <br />7on Kvemmo <br />fiveceu <br />Cloudy w/ Lt Raln, 40's <br />Conauuction MunitorLig <br />�1e xo.: 3561Bo2 <br />Date: 12/4/02 <br />RepoKNo: LO <br />puge; 1 of 3 <br />ay: �cL <br />We vi� ited the project si e tuday at the request of Ron with Kvemmo Consuaction for the ptupux of <br />evalu�tins Fowidetion subgradc soils. <br />We me� �� Jon Kvemmo, Ron, and ihe e:uihwork contculur on site. Shtllow� spread footings are <br />planned Por the wesbem. �wrtion of t6e hoiue. We observed footing trcnches txing excaveted In the <br />noxthwestena Fartion of he plwrcd hoiue, as shown on :he attached s�te p�an. FootinE trwches ranged <br />frcxn approaimabely 0.5 .0 3 tect in dcpth. Native silt and �i11y san3 with gtavel wae oxpoxd in thc <br />t+uttom of the footing anas, while bru�vn fill materid was observed above t6e aative soiLs in most of the <br />footing a-eas <br />We evaluated foaing su �grade soils niing a 0.5-inch dierneur soxl yn�be rod. We wero'b:e to <br />Fenetrate appxvuwaiely 1 to 3 inches into the na[ive soiis nnder moderste pnessure, iodicating very stiff <br />or dcwc soil conditions However, we wero able to probe approximately 3 fect in two isoleted areas av <br />shown on �6e site pl�, i idicadng loos� or soR soiLs. We reoonomended that the looqe c� soft soils be <br />overnzcavated down to ;ncdium sdff or mcdium dense soils. Jm �{reed �ed oaopl►sd "rit6 °°c <br />recomma�d�tioa• <br />A drain treech backfilleil with silt and silry sand with g�ve] awses wida meas of tbe plaatKd S�oting <br />tocatiuns in Uu nurthetn pocticm of the housa footprint, as showni on the site plsa. The �d ��� <br />wac approzimately 3 tn d feet wide. Jon did not want to ezcavatt clox to tbe drainpzpe. <br />did not over-exwvate tn:nc6 bxkfill and somc of t!x swrou�3ing fil1. We werc able to piobo <br />apptoximalely 4 to 12 ie cbcs iwro tk�e trench backfill under moderete p�essaze, andicatinB soft °r 1°°s� <br />conditions. J on pinns to use a grade bcam dcsign in place of the £oodng deslgn to bridge tho loose or <br />soft soils in thc t:cnth b�ick5ll a�cas. <br />It is our uRinioo thu t6e fodin` sabP*de aoil+ovdn�eed todaY oirtside of the trench backGll azeaa <br />stauld ptnvide a�ia�oe R�PDat for �b° Plauoed teeideoce• <br />We have becn informed thal tba footing aenches will be becktilled wim Conuolled Density Fill (CDF) <br />prior to footing placeme �t. We reevmmend removiog any waror ar slough prior to pouriuoq GAF• <br />It is aff opinion t6at the existing Ioosc fill in the planned gecege en� h�use areas may caus° crackinB of <br />the slabs on grede due tc• long tttm utticsncnt of d�e fill. Wa [ecomm:'nded to Jon that it uoay be <br />prudrnt ro reinforce the �lab with rebaz to reduce the pocentiel for cracking of the slab over ume. Jon <br />Attxtunents: Sitel'la�i Signed: <br />Distribution: <br />U <br />