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July 25, 2024 <br />HWA Project No. 2024-231-21 <br />East Marilyn Avenue Culvert 2 HWA GeoSciences Inc. <br /> <br />Category 2: Sensitive information <br />Category 2: For official use only / disclosure permissible by law. <br />1. Plan Field Exploration Program: HWA will plan and coordinate a geotechnical <br />exploration program for the project. The exploration program will consist of one <br />day of drilling at the project site. All work will be completed within City of <br />Everett right-of-way. Any required permits will be provided to HWA at no cost <br />to HWA. <br />2. Mark and Verify Utility Locates: Prior to generation of the geotechnical <br />subsurface exploration plan, HWA will mark the proposed exploration location <br />for the work and arrange for public utility locates using the One-Call Utility <br />Notification Center. Utility location marks will be used to verify the proposed <br />field exploration location prior to development of traffic control plans. <br />Additionally, HWA will also engage a private locating service to have <br />conductible underground utilities located in the vicinity of the proposed boring. <br />3. Develop Traffic Control Plan: HWA will develop a traffic control plan to <br />conduct the proposed geotechnical exploration within the roadway. HWA <br />assumes that the traffic control plan will consist of a single lane closure with <br />flaggers. <br />4. Generate Geotechnical Exploration Plan: HWA will develop a geotechnical <br />exploration plan that outlines the proposed field work. This plan will be <br />submitted to the design team and city for approval and permitting. <br />5. Conduct Geotechnical Explorations: HWA will drill one (1) 40- to 50-foot <br />boring at the location of the proposed culvert. We assume this boring will be <br />located on City right-of-way and will not require rights of entry to private <br />property. HWA assumes that completion of the proposed boring will require one <br />day of drilling. <br />The boring will be drilled with a full sized truck- or track-mounted drill rig. All <br />additional support vehicles will be staged on site adjacent to the boring location. <br />The geotechnical boring will be logged by an HWA geotechnical engineer or <br />geologist. The boring will be backfilled per the Department of Ecology <br />requirements. <br />6. Generate Boring Log and Assign Laboratory Testing: HWA will prepare a <br />summary boring log and perform laboratory testing to evaluate relevant physical <br />properties of the site soils. Depending on the type of soils encountered, <br />laboratory testing could include moisture content, grain-size distribution, and <br />Atterberg Limits, where appropriate. <br />Geotechnical Engineering Design Services: <br />1. Evaluate Field and Laboratory Data: HWA will evaluate the data obtained <br />from the subsurface exploration and laboratory testing to develop design <br />recommendations and construction considerations.