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June 13, 2024 <br />HWA Project No. 2024-P180-21 <br />Proposal for Geotechnical Engineering Services <br />Everett Stormwater Conveyance Improvements 2 HWA GeoSciences Inc. <br />Collect and Review Available Geotechnical Data: HWA will review available geotechnical <br />information in the vicinity of the project sites. This review will include online geotechnical <br />databases, geologic maps, previously completed geotechnical reports, and the HWA library. <br />Perform Geotechnical Site Reconnaissance and Mark Utility Locates: HWA will conduct a <br />geotechnical site reconnaissance of the project area. This reconnaissance will be used to identify <br />geotechnical challenges and to assist in planning the geotechnical exploration program. While on <br />site, HWA will mark the proposed exploration locations and arrange for utility locates using the <br />Utility Notification Center. <br />HWA will conduct an additional site visit to verify and clear the proposed exploration locations <br />after utilities are marked by the Utility Notification Center. Proposed locations will also be <br />verified and cleared with a private utility locate subcontractor, as needed. HWA assumes <br />load/unload, reconnaissance, and travel to the site requires 4 hours for each trip. <br />Traffic Control Plans: HWA will hire a traffic control subcontractor who will develop traffic <br />control plans for the proposed explorations. HWA assumes conducting the proposed explorations <br />will require flagger-controlled lane closures of one lane. <br />Right of Way Permit Application: Because explorations will be located within the travel lanes <br />or shoulders of publicly owned streets, HWA will coordinate with the City of Everett to obtain <br />right-of-way/traffic control permits. HWA will coordinate a traffic control subcontractor to <br />provide appropriate traffic control personnel and devices when working within public right-of- <br />way. It is assumed that the required permits will be provided at no cost to HWA. <br />Plan Geotechnical Field Exploration Program: HWA will plan and coordinate the <br />geotechnical exploration program for the project. The exploration program will consist of <br />drilling up to 10 borings and installing four groundwater monitoring piezometers at the location <br />of the proposed improvements to obtain soil and groundwater information for design and <br />construction of the project. The planning efforts will include coordination with various <br />subcontractors, the design team and the City of Everett. <br />Conduct Pavement Coring: Based on existing information provided by the client, the pavement <br />section of Evergreen Way includes Portland cement concrete pavement. In order to access the <br />soils beneath the pavement and to characterize the thickness of pavement section materials, <br />HWA will complete one pavement core at the boring located near the intersection of Evergreen <br />Way and W McGill Ave. An approximately 12-inch diameter core barrel will be used to drill and <br />extract the pavement core to assess current roadway conditions. Set up for the coring process <br />consists of securing a portable drill-press to the pavement using an expansion anchor, attaching <br />the drill motor and core barrel, and leveling prior to drilling. Water is injected into the core <br />barrel during drilling to mitigate dust and cuttings are vacuumed from the roadway as they are <br />produced. The coring process will take approximately one to two hours at the proposed location