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I�IBBLE ENGIf�E�F��, II��. <br />Professional Structurai Engineering Services <br />S t'YZ�C t2l.YtX.I <br />Review <br />S 2lYi'I.Yt1GiY�1 <br />I lo��cver, the sett(ement at the south end of Building 425 does not appcar to be relatcd to lateral earih pressures. <br />NGA noted organic and till material helo�v the foundations at View Ridge at the east end that likely caused the <br />settlemeirt. DF.1 did not obscrvc any failure modes associated ��-ith a failure do to lateral earth pressures. Ttiis <br />�votild includc distress suc}i as long horizontal cracking at mid-hei�ht ofi the basement �valls and/or movement of <br />thc top of the wall towards the interior of the building. <br />If attempts to strengthen the basement �valls are not made and if the lateral earth pressures exceed the basement <br />��alls' capacity to resist the►n, the basement ���alls, primarily at the top, �vould move toward the cra�vlspace. The <br />basement �valls �� ill likelv move at different rates, thcrefore a portion of the basement �vall may initially fail but <br />not necessarily result in a collapsc of the buildin� above. If this happens, the a�vners at Vie�v Ridge �vill nced to <br />repair tlie section of basement �vall in addition to implemeiitin� clements of NGA's ���all strengttieni►ig <br />recommendations in the viciniri� of the immediate a��ca of the failure. <br />Wall Manitoring <br />A mc�thod to mqnitor �vall movement du� ta lateral earth <br />pressures inclucles visually� inspccting tlie ���alls on an <br />annual basis for horizontal cracking at the rnid-hei�ht of <br />wall. Discoloration from water seepa;e n�ay also indicate <br />a crack. <br />A�i additional methad includes monitoring the movement <br />of the top of the walL In ordcr t� accumplisl� ihis, attach a <br />plumb bob at the top of the ���all at mid-span of the ��all <br />�tihere settlement has occurred and at the location of the <br />longest horizontal span�. Plcase see tl�e lttached sketch of <br />ihc plumb bob auachment. <br />Dibble rngincers revie�v is speci�c to the areas addressed <br />in tliis letter. I�o otller struct�n�al components �vere ��G��v� <br />revie��ed or evaluated. Plcase contact us with anv <br />questions or clariiications. �tie look for�vard to «orking �vith you as you <br />continuc, <br />Since �, <br />� ��� ,... <br />�D1 �' �G11�LL;RS, 1NC. <br />�:dward Lgan, PL <br />Project Manager <br />Attachments: �'Vall Monitoring Sketch <br />Calctilations (3 shccts) <br />�3ui1d9ng A�2 e <br />,w, ��.� ;v� d.��� <br />R�nl�;+�:,�m <br />tlttach Plumb Bob 1h�'here <br />Settlement Alread}' C)cctarred. <br />7.lai.�ci�av;e <br />Attach Pluntb Bob at Mid-Pc�int <br />of'Lon�est Hori-r_ontal Spat�s. <br />'fi � <br />1029 A9urhef Stre� I Puge 1 of 2 P. ;!1_5-�28-=F200 <br />I:irklnr�d, �1:9 9�5033 F. �l25-a27-6131 <br />