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��o� i � Zl �� :»4FM 6raur ! �teripc �do uG96 P 4 <br /> ' Mr, Ieff Colc <br /> Project BABX-02-0672 <br /> Novernber 8,2002 <br /> Page 2 <br /> Thc approximaie 3ocations of the hand auger borings,DCP tests and hand penetromcter tests are shown <br /> on the attached sketch <br /> The l�nd auger borings were perfurmed with a 3 1/2-:nch-diamctcr hax�d auger_ The barings wexe <br /> acivanc;ed in appro�cimate 6-ineh inerements to depths apptoxinnate)y 1 to 4 feet below the bottom of the <br /> cxcavation. With each increment penetrated, the auger was then withdrawn front tht borehole to obtain <br /> soil cuttings. Tf�e soil encountered in thc borings was classifiec in g�cral accor�ance with ASTM 2485, <br /> "Deseript'son and Identification of Soils(Visual(Manual l'rocedsres}." Prelirninary estimatcs of soil <br /> consistency and density were also evaluated based on resistancc to penetration of the h�nd 3u�er and the <br /> turning resistanc�. <br /> The h:�nd penetrometer tests were dane with a Soiltest Model CL-700 pockct pez�ctrometer.. '1'he po�kel <br /> peneirometer is a hand-held,spring-loaded device with a cylindriwl-shaped tip_ The tip of thc pocket <br /> penetrometer is pushed into thc soil approximately Y.inch. Thc calibrated spring provides an indicatior <br /> of the soil's compressi�e strength.. <br /> The d}rnamic eone penetro�neter tests were done using a solid metal rod fitted ti�zLh a 1 "a-inch diameter <br /> conical point. The poir:t is driven into the soil with a 10-pour:d weight falling 24 inches The num.Uer of <br /> blows rec�uired to drive the point incrementalJy G inches into the ground is recordcd. The blows reyuu-ed <br /> to drive lhe puint eaeh 6-inch increment is then used to judge the soil's rc;larive density and as a basis to <br /> estimate the suitability of thc soils to support the design loads, <br /> Results <br /> Thc;hand auger borings taken horizantally bcneath the existing footings ider►tified as HA-3 and HA-4 <br /> encount�red Iean clay to sandy Iean ciay gl�cial tiII. The lean cfay at�d sandy lean clay corresponds ta <br /> ASTM dcsi�nation CL Hand penearomeler readin��s in the lean clay showed readings of 1 %z to 3 '/: Tor.s <br /> per square f'oot(tsf}. <br /> The hand au�r borings taken along the north footing line identified as HA-1,HA-2 and HA-5 <br /> encountcred agproximaceiy G inches to 12 inches of blaek topsoil with roots underlain Uy lean clay to <br /> sandy lcan.clay�lacisi tilt. The topsoil was thickcs:{ap}�roximntely 12 inches)at HA-t and tapercc�off to <br /> approximately G inches at HA-S. Hand penetrometer readings in che Jean elay recove:ed f�'om t}�e hand <br /> auger borings showed zeadings of 1 %z tsf at HA-1 and 3 tsf at HA-S. <br /> '�I'he Cxcavation base showed lean ciay and sandy Iean cta�along the tivest and sovth fooling 3ines. HIInd <br /> penetrometer readings in these areas showed readings�enerally greater lh�n� tsf <br />