1135 CRAFTSMAN WAY 2018-01-02 MF Import

� — �,,._..-.. ,_. .. � Prclimin;iry Pindings from Revic�s� ofGcotcchnicil Rcports North Nlarina Dc��rlopmcnt � livcrctt, 1�'ashington �-tarch 24, 2004 CG Proje:t No. 157G I �'�l:c � 100 fcet before encuunt�rin� :i drnsc �uil la�cr. In gcner:il, thc dcpth to the drnse suil increases to the �ccst Ito�vards lhc channcl. IGroimdwalcr lilc�:uions 1Vc mc�surcd thc ground w-stcr cicvations thruugh a tidal cycic on January 3l, 2004, on dw sim at scvcn ground Iwatcr wclls installcd by Landau Associatcs. 'f}�ically, tid�l influcncc is not significant Qess than onc foot) 100 fect or more Gom the wat�r's edge. [3ccause of the nature of the fill and reportcd wood chips ar sawdust, it ��as Iconsidcred possible that marc influcncc could occur if channels of ntare pcmicable coarse matcrial existed within thc fill. Over lhe 8 hour tidal cycle which went from a high elcvation oC l 1.4 feet to a low elevation of 2.4 fect, wc Imcasured less than 0.2 fcet of maximum inllucnce in thc wclls. \Vhat we did find �vas an cllipticnl groundwater moimd in Ihc central portion of thc sitc. 7'hc long asis of thc moimd was in thc cast-wcst dircction. Thc maximum Ihcight of thc mound ��as mcasurcd at about cicvation 15 fcct �ti�ith thc lo��cst portion of Ihc mound at about 11? fccl. ITh� mound is consistcnt «iih uur �isunl obsenations at the site. 'l�he m�in acccs; ro:�d, 13t1i Street, essenti;illy, I bisects the site. On either side of this strect arc large svales that accept surtace storm ��•ater. Our interpretation is thnt these swalcs act as ground water infiltration areas and that the corresponding ground water mound is due to I a inrer storm water infiltration. \Ve expect this mound to bccome much less pronounced during Ihe dry summcr months. Measurements should bc taken thcn to verify this. \Vc would expect after dcvelopment that thc mound �vould essentially disappcar as surface infiltration should bc minimal. This ��•ould translate to a water icvcl of � abnut cic�ation I 1 fcct. �1'ith timc this cic�;itiun could bccumr somc�chat lo«cr�aithout ground ��atcr rcchargc. � PRI�.LI�IINARY UI�:SIG\ CONSIUGI2:�7'IONS Chc sienitcant gcotcchnical design considcrations arc as fallun s: " • The underlying soft silts will result in surficial settlement when subjected to ne�� loads. The building � loads �vould not cause significant settlement of thc lo��er soR silts, but could induce setUcmcnt in the upper soR soils. I.argc arcal fills should bc c�pccted to cause setdemcnt in the deeper suft soils, as «cll as in �he u��per soils. I � c Cornerstone Geotechnical, Inc. �/ � I