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Page 2 of 4 <br />City of Redwood City 1017 Middlefield Road, Redwood City, CA. 94063 Tel: 650-780-7000 www.redwoodcity.org <br />The walls within alternate work area A had high levels of displacement, and the walls within alternate <br />work area B did not show displacement. <br /> <br />On June 6, 2024, City Council approved the contract for the Redwood Creek Channel Improvement near <br />1891 Palm Avenue. This contract allowed for the permanent repair of approximately 77 lineal feet of <br />concrete lined channel (Base bid + Alternate A), refer to Figure 1. Due to the relative severity of Alternate <br />Work A, the consultant recommended replacing this section of creek wall. The consultant did not <br />recommend replacement of the Alternate B section (37 lineal feet) because this section did not show <br />immediate signs of failure. Staff was tasked with monitoring this section of the channel wall for signs of <br />displacement. <br /> <br />Figure 1. Project Location - Bid Base and Alternate Work. <br />ANALYSIS <br />During the construction of an excavation support system, the contractor observed displacement on the <br />creek wall segment within the Alternate B area. On July 22, 2024, Engineering and Public Works staff, <br />along with the design Consultant, visited the site and confirmed that the Alternate B section moved 2.38 <br />inches since the initial survey. This displacement indicates that the wall in Alternate B section is moving, <br />6.G. - Page 2 of 4 <br />198