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7.B. - Page 34 1 Project Description <br /> bulldozer, and a small truck. Assuming the use of 12-cubic yard dump trucks,the removal of <br /> excavated materials associated with the pedestrian undercrossing would result in over 196 truck <br /> trips, at an average of 20 daily truck trips during this phase of the project. Preliminary testing <br /> indicates that the soils can be classified as Class II "designated" nonhazardous wastes,which can be <br /> disposed of at landfills permitted to accept these wastes. Soils within the project area consist <br /> primarily of Young and Old Bay Mud. Prior to disposal of the excavated soil,additional soil <br /> sampling and testing would occur to determine if liquid concentrations would be released during <br /> disposal. When necessary,the contractor would spread Bay Mud soils in rows to dry or mixed them <br /> with other excavated soils on site so that the transported materials would meet the landfill disposal <br /> criteria. <br /> A tieback retaining wall would be installed along the face of the existing north side abutment in <br /> order to maintain the integrity of the bridge support and roadway embankment. This tieback <br /> retaining wall would utilize horizontal tiebacks approximately 30-feet long that would be supported <br /> by tieback anchors located between the existing abutment piles. Crews would use a small drill <br /> machine to install the tiebacks because of the limited headroom and working space. Spoils from the <br /> drilling operation would be removed and disposed of off-site. The drilled holes would be filled with <br /> cement grout. Approximately 80 cubic yards of shotcrete would be needed for the tieback wall. <br /> After installation of the tie-back retaining wall, crews would excavate the creek bank and drive in <br /> micro-piles to support the concrete path along with the creek-side retaining wall. Approximately <br /> 44 micro-piles extending up to 30-feet deep may be needed to provide vertical support of the path. <br /> Once the micro-piles are in place,detention drainage pipes,drain inlets, and discharge pipes to the <br /> creek would be installed. Finally,the slab footing of the path would be constructed along with the <br /> creek-side wall. <br /> Crews would perform electrical work for the pedestrian lighting and installation of the access gates <br /> and call boxes after the concrete work under the bridge is complete. Landscape walls and the <br /> pedestrian sidewalk would be constructed,and all landscaping can be done to restore the area near <br /> the bridge. <br /> The work in the City-owned parcel would involve minimal clearing and grubbing as well as some <br /> rough grading. The sidewalk and joint-use path would be installed along with the landscape trees, <br /> pedestrian streetlights, and the scenic overlook area. Minimal landscaping would be needed to <br /> restore the site. <br /> 1.5.3 Project Schedule <br /> Construction of the storm drain pump station would take approximately 120 working days, from <br /> January 2014 to June 2014. Construction of the US 101 pedestrian undercrossing would take <br /> approximately 150 working days, from June 2014 to December 2014. Weekday construction hours <br /> would be limited to 7:30 am to 4:00 pm,Monday through Friday, excluding City-recognized <br /> holidays. <br /> 1-8 US 101 Pedestrian Undercrossing and <br /> Bair Island Storm Drain Pump Station Project <br />