Laserfiche WebLink
Junc 28,206 <br />David and Judy King <br />L&A Job No. 6A076 <br />Pagc 5 <br />gcotcchnical cnginecr 1'rom our ol7icc was prescnt Juring thc exploralion, who cxamincd ihe soil <br />satnplcs retricvcd from the �cst borings and he soil and gcologic conditions cncountcrcd, and <br />completcd logs of test borings. Detaiicd descriptions of the soils cncountcrcd during site <br />exploration arc prescnted in thc test boring logs on Plates 4 through 6. <br />Standard Penetration Tcsts (SPT) were conductcd, in accordance with ASTM D-1586, in the <br />bore holes using a stand:ud split-spoon samplcr of 2-inch outside diamctcr, driven with a 140- <br />pound hammer thut was raiscd and relcaseJ for a 30-inch frce fall. Thc m:.mber of blows <br />rcq�iircd to advance the sanipler a given dist:uue is un indication of the density for gra.!dar soils <br />or the consistcncy of cohesive soils. 'I7u samplcr was advanced 18 inches anJ the total numc^r <br />of blows for thc last 12 inchcs �vcrc rccordcd ou thc boring logs as SP7' N-valucs. <br />'I'est I3oring l, locatcd within thc footprint of thc wcst garage, cncountered 15 fect of vcry-loosc <br />to lousc fill of silty finc sand, undcrlain by a lhin laycr of relic topsoil. This laycr of loosc fill <br />appcars to tw pushcd ovcr tlic original top of slopc from the dcvelopment of the existing <br />residcnce on thc southcrn lot to fonn thc slupes and benches al the soudi end of thc northcm lot. <br />Tcst Borings 2,md 3 cncountcrcd a laycr of loosc, organic topsoil, about 0.8 to 1.7 fcct thick. <br />Undcrlying thc topsoil in Test I3orings 2 �nd 3 are �veaQicred and fresh Gsperance 3and deposits <br />of brow�n to light-hro�m to liglibgray, mcdium-densc to Jense, silty to cican, fine to medium lo <br />cocvse sand. 7�hc tolal thickncss of thc F.sperancc Sand dcposits is abuut 18 fcet in Test [3oring 2, <br />anJ was not pcnetraled through by '1'cst I3oring 3. Un�lcdying the relic topsoil in 1'est I3oring I <br />cuid thc fresh I?sper;mcc SanJ dcposit in Tcst I3oring 2 is a ticsh WhiJbcy Pormation deposit of <br />gray, h.vJ, tinc sandy silt to claycy silt. <br />GROUNDWA"1'b:R CONUITION <br />Groundwatcr «as encountcrcd in 7'cst [3orings D-1 and I3-2 at 14.0 and 18.0 feet, respectively. <br />'1'hc WhiJbey formation underlying the site is of extremely luw permeability, and would perch <br />slonnwater infiltrating inlo the more pertnenble surficial soils. This perched groundwater would <br />LIU & ASSOCIATCS, INC. ' <br />�� <br />