Brown and Caldwell, Inc. 9/20/2023

PGSF WMVD Storm and Combined Sewer Design Scope of Work 08-25-2023 12 of 41 Category 2: Sensitive information Category 2: For official use only / disclosure permissible by law. • Invoice Generation and Processing: HWA will prepare monthly invoices, and progress reports for the duration of the design phase of the project. • Design Team Meetings: HWA will attend up to ten (10) meetings, each 1 hour in duration. Up to two geotechnical Consultant staff will attend each coordination meeting. • Collect and Review Available Geotechnical Data: HWA will review readily available geotechnical information along the project corridor. This review will include online geotechnical databases, geologic maps, and HWA library. • Perform Geotechnical Site Reconnaissance and Mark Utility Locates: HWA will conduct a geotechnical site reconnaissance of the project area. This reconnaissance will be used to identify geotechnical challenges and to assist in planning the geotechnical exploration program. While on site, HWA will mark the proposed exploration locations and arrange for utility locates using the Utility Notification Center. HWA will also subcontract a private locating service to attempt to locate and mark underground utilities at proposed subsurface investigation locations. PVC and concrete utilities cannot be located. HWA will not be held liable for damage to utilities or other underground structures not defined or located for HWA by the City of Everett or the Utilities Underground Location Center. • Plan Geotechnical Field Exploration Program: HWA will plan and coordinate the geotechnical exploration program for the project. The exploration program will consist of drilling a series of up to 12 borings to provide data for design of the proposed improvements. The planning efforts include coordination with the Port of Everett. • Verify Utility Locates: HWA will coordinate up to two site visits to verify utility locate marks prior to finalizing our exploration plan memorandum. • Generate Geotechnical Subsurface Exploration Plan (SEP): HWA will prepare a Geotechnical Work Plan Memoranda, which will include a project specific Health and Safety Plan, for the proposed field work. The work plan will be submitted to the design team and appropriate jurisdictions for review and approval. The work plan will detail the type, location, and extent of proposed field explorations along with logistics necessary to perform the work such as traffic control plans and staging areas. • The work plans will also be used for utility locating clearances and for permitting that may be necessary to access the exploration locations. We assume the required permits or rights of entries will be provided at no cost to HWA. Additionally, HWA assumes that coordination with BNSF will not be required. • Conduct Pavement Explorations: HWA will conduct up to 8 pavement cores along the alignment of proposed improvements to assess the thickness of the pavement structure. Coring will be performed using a 6-inch diameter, diamond-tipped core barrel. At each core location hand borings will be excavated through the core holes to depths of about 1 to 2 feet. The information obtained from pavement cores will assist the design team and prospective contractor in calculating bids and quantities. HWA assumed the pavement core will take 2 working days to complete and the work will require traffic control consisting of 2 flaggers to conduct the necessary lane closures. • Conduct Geotechnical Explorations: HWA will conduct a series of up to 12 geotechnical borings along the alignment of proposed improvements to assess the subsurface soil and groundwater conditions. Ten (10) borings will be drilled along the proposed utility alignments to depths of 15 to 40 feet to evaluate the subgrade soil and groundwater conditions. Two (2) boring will be drilled to a depth of 50 feet at the location of jacking and receiving pits for the proposed trenchless crossing. Three (3) groundwater monitoring piezometers will be installed at selected boring