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August 16, 2019 <br /> HWA Project No. 2015-061-21 <br /> to a firm state as determined by HWA. HWA believes this should provide adequate support for <br /> structures during placement and connection activities. As the structures will, even in a saturated <br /> condition, weigh less than the soil they are replacing no increase settlement is anticipated below <br /> such structures. <br /> Connections Into Vaults and Manholes <br /> Total settlements noted across the site have been estimated to be up to 30 inches in some <br /> locations. The utility line connections are maintained across the site by using flexible pipe when <br /> feasible and flexible connections when needed. However, pipes leading into non-pile supported <br /> structures should experience similar settlements as the non-pile supported structures themselves <br /> and thus shearing of the utility lines in these areas due to large differential settlements over short <br /> spans is not anticipated. Therefore special fittings to connect pipes to non-pile supported <br /> structures are not considered necessary. <br /> 0•0 <br /> If you have any questions or require additional information, please contact the undersigned at <br /> your earliest convenience at (425) 774-0106. <br /> HWA GEOSCIENCES INC. <br /> G\Ap, L S. pp� <br /> F whsy�t <br /> , O <br /> etc_ 43697 <br /> leoreim- <br /> -5, g-I G-If <br /> en?9-1 20 <br /> Michael S. Place, P.E. <br /> Senior Geotechnical Engineer <br /> Riverfront Development Phase I <br /> &Riverfront Boulevard,Addendum 3 2 HWA GeoSciences Inc. <br />