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5ep 22 i1 1Q: 32a 650 595 5066 p. 3 <br /> 8.B. - Page 157 <br /> �� VaIataRaad Subd'zvision September 12, 2Q11 <br /> ��� <br /> � <br /> rear iat elevations are at ar sli�,t�y above the lip o:f the cancrete ck�anne11i7o.�ag and tlaere would <br /> be an averland rel�e o#`nanoff into the cha�uael should t�-ie drainage system t�e com�romised. <br /> Th�is condii�on is si�l�r�to�t currently exisixn.g o�n the site. <br /> ��,�.n��2 <br /> ��entatio�v�L'c��: <br /> a. The�',�hr�€vvay app�s to be too close�o the c�eek. <br /> b. V���r.y�r �es s��tit� n�t im�ose a�oad on the cxeek bank assuming a <br /> 1:� s���r�ae�. <br /> c. A geoteclinicat report shali be prepared to demonstxate that there will be no laad on <br /> the areek banlc. <br /> No pernfanent structwres shall impose any loads on the existing creek channel. <br /> Ea�h_Svstems Pacific Response — The creek channe� oppos�te tl�e Lot 5 drive�vay is concrete <br /> lined. According�a field rr�easurern�ts taken by the project civil engineer, the e1laz�nel slope is <br /> appzoximateiy '1.5 feet high vvi#k� a harizaz�tal base width of 7.25 �eet (s�ope gradient <br /> approYiznately 1:1}. There is an 1 S inch vvi de�X�of conczete at tYze top of the channel. The fence <br /> wi.11 be at the edge of the lip, an.d the ecige of�'ie concrete pavex driveway will be approximately <br /> 2 feet ou� frorn the fence. T�e fir�ish gzacie of�e pavers wzll be approx�matelq 1 foot above tlae <br /> elevatian af the concrete lip. <br /> �t zs anticipated#hat the dr��eway will receive lzgkzt personal vehicle traf�ic. Assunaia�.g a 6000 <br /> pound gross wez,g�ht, t�re load to each tare would be �500�aunds_ A typical tire on an SUV type <br /> of vehicle has a ti�e wi� of 8 in.ehes and a contact leng�h of approxix.�ately 6 inches. The <br /> attached Figure 1 sk��+�s a era�ss sectic�n �roug�i the end of the dx'iveway. It sha�vs the cbannel <br /> slo�e,the chacu�el linir�g lip,fence,and the pavem�nt sectiom to scale. The diagratn ass�usrtes that <br /> the vehicle tire wzl)�ae�t�e edge of ti�e pavement. <br /> The zone of influence ft�r a vertically Ioa�ed s�zrface, such as a vehicle �ire, �adiates autward at <br /> an an��e of between 30 and 45 degrees fram the vertic�l. For this ana�ysis r�re have asslux�.ed 4�S <br /> degrees, tl�e more conservative assurn.ptian. The attached figure shows two lines radiating down <br /> and ot�t at 45 degreES fro:nr��o#h t}ae edge af the pavemant fill and thE edge of the pavenaent. As <br /> can be seen in tk�e section, the channel lining will be beyand the zons of influence of the applied <br /> press��re from both the driveway fill and the vehicle�oad. <br /> The zoz�e of influence of the vehicle ti.re was alsa evaluated us�ng a Boussizzesq analysis based on <br /> the tl�eory of elas�icity. Accordi�g to the attac�ed Figure 2 the zone of influence for a squaze <br /> loaded area eartends auri�ard from tf�s loaded area approximateiy 1.5 times the r�vidth ofr the <br /> loadec! area. Sinr,e t11e canta.ct az�ea of the tire is 8 inc�as �he latera� d'ux�ension of the zone of <br /> i�fluence is approxiriaateiy 12 inches. The tire wii� be at I�ast 2} feet fxom the channel lining <br /> � <br />