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E <br />��y� <br />C R1 x <br />q N <br />>HN <br />y <br />�H� <br />oxo <br />'� H'41 <br />W H <br />H <br />xp <br />OHd <br />��g <br />�V � <br />>H� <br />y <br />t M Fi <br />g �' <br />C] �J !~p <br />q t� <br />�� <br />O fy/� <br />� <br />1 <br />I �� <br />D.1VID L.NGLSON AND ASSOCIATES,INC. <br />ConsiJiing [ngincering Gculug� <br />Febcuary 8, 1990 <br />PLoiect Na. 08°0 <br />Page 6 <br />Stzuctuzal Fill <br />All fill placed beneath buildings, pavements, oz othex sett!e:nent sens:tive <br />features should be placed as st[uctucal fill. Stcuctucal fili, by definition, <br />is placed in accotdarce vith pcesczi6ed methods and standacds, and is <br />monito[ed by an expeci�nced geotechnical pzofessional oz snils technician. <br />Field monitoring p[oceduzes vould include the pezfoimance of a zepceseata�ive <br />numbez of in-place density tesGs to document the attainment oE the desired <br />degxee of zelative compaction <br />fill matecials and stcuctucal <br />geotechnical consultant. <br />Azeas to zeceive stcuctuzal fill, structuzal <br />fill placement should be appioved by the <br />Ae anticipate that ground vatei vill be encountezed vithin some oE the <br />foundation excavations. Also, ve expect that the dcive vay Eill vill be <br />unde[lain by loose vet soil conditions. Wheze these conditions exist, ve <br />cecommend that a gcavel be used foz fill until the fill sucEace is above the <br />influence oE the giound vate=. The gzavel should consist of 2 inch czushed <br />cock (cailioad ballast), placed in maximum 1 foat Lt:ts, and compacted to a <br />unifocro state by txack equipment. Ae xecommend that ve be retained to <br />evaluate excavations and subsucEace conditions at the time oE placement of tha <br />gcavel to ldentify beazing soil and to detez:nine depth o: overe�ecavaton and <br />fill thickness. <br />Foundations <br />In ouz opinion, the use of shallov spzead footings founded on the native, <br />undistucbed glacial soils, oc on appcoved stcuctuial fill oc ccushed cock, <br />should pcove suitable Eoc suppoct of the pioposed dvellings. For planning <br />pucposes, an allovable soil beacinq pressuie of 2500 pounds per squace foot <br />(psf) could be used for design of shallov footings founded into the medium <br />dense to dense advance outvash sands, sttuctucal fill oL crushed tock. The <br />suggested soil beating capacities use a factoi of safety of 2.5 and is based <br />an the folloving conditians: <br />i. all footings should be Eounded lnto the native site soils <br />as desciibed above, stzuctucal Eill oc czushed cock. <br />