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City of Everett Edgewater Creek Bridge Replacement <br /> WORK ELEMENT 2 SURVEYING: <br /> This Work Element is performed by 1-Alliance to provide topographic survey and engineering <br /> basemaps of the existing Edgewater Creek Bridge and its surroundings, including pick-ups of <br /> flagging for Ordinary High-Water Mark (OHWM) of the Creek and topo mapping of the ravine <br /> 100 feet north and south of the existing bridge. <br /> The east-west project limits along W. Mukilteo Blvd. will begin 150' southwesterly of the bridge <br /> structure and continue 110' beyond the northeasterly end of the bridge structure. The limits <br /> include the intersections with Mukilteo Ln. and Shore Ave. <br /> Above the ravine mapping will be to full Right-of-Way from Mukilteo Ln. to the top of the <br /> ravine and from Shore Ave to the top of the ravine. The limits include the top of bridge from <br /> barrier to barrier. <br /> Ravine mapping will extend approximately 100-feet northerly and southerly of the bridge face <br /> and will be 25-feet each side of the center of the ravine. The limits include mapping directly <br /> below the bridge from bridge abutment to bridge abutment, if accessible. <br /> Ordinary High-Water Mark flags may extend 100-feet southerly and northerly of the bridge face. <br /> 1 Alliance proposes using a 3D terrestrial scanner for mapping the roadways and the underside <br /> of the bridge structure. <br /> Please see Exhibit A, Surveying Limits, attached to this proposal. <br /> 2.1 Surveying and Mapping <br /> 2.1.1 Survey PM,Admin, QA/QC <br /> This task includes the survey project management,administrative duties, and quality <br /> control required for a project of this complexity and magnitude. Depending on the <br /> project requirements, 1 Alliance will assign a Survey Project Manager,Assistant Project <br /> Manager, and Survey Quality Leader for this project. <br /> 2.1.2 Survey Control <br /> This task includes the establishment of survey control,or the recovery of existing survey <br /> control, as required for the project. Typically, survey control will be set,found, or <br /> referenced utilizing Real Time Kinematic (RTK) GPS (GNSS)and the Washington State <br /> Reference Network(WSRN) in conformance with industry standards. This survey <br /> control is then typically propagated,as required,utilizing standard terrestrial total station <br /> measurements. <br /> Page 4 of 42 <br />