Brown and Caldwell, Inc. 9/20/2023

PGSF WMVD Storm and Combined Sewer Design Scope of Work 08-25-2023 15 of 41 Category 2: Sensitive information Category 2: For official use only / disclosure permissible by law. exploration locations and other pertinent features; summary coring and boring logs; and laboratory test results. The report will also include the results of our engineering analyses and provide geotechnical recommendations for the proposed improvements. In addition, environmental conditions of the areas investigated and recommendations for considerations during construction will also be included in the Geotechnical Engineering Report. • Respond to Geotechnical Related Review Comments: HWA shall provide written responses to all review comments. The written responses shall be provided in the form of emails to the design team. • Geotechnical Plan and Specification Review: HWA shall collaborate with the design team to verify that the geotechnical engineering requirements are properly incorporated into the plans and specifications. • HWA QA/QC: All design calculations and recommendations will be reviewed by a senior principal prior to distribution to the design team. • Miscellaneous Engineering Support: Additional time will be allotted to account for any design aspects introduced to the project at a later date or that were not accounted for in this scope of work. • Prepare Final Geotechnical Engineering Report: HWA will prepare a final geotechnical engineering report for the project once review comments are provided. Task Assumptions • The anticipated project Notice to Proceed is August 2023. • Planning and design services will be completed within 24 months from NTP. • Up to twelve (12) geotechnical borings will be completed in support of design for the corridor. • No review of documents pertaining to environmentally regulated sites along the project corridor are included with this estimate. All chemical soil and groundwater sampling will be conducted in conjunction with and in locations selected for geotechnical investigation only. • Drilling will be conducted within the City Right-of-Way (ROW) and Port of Everett ROW. BNSF permits and/or coordination will not be required. HWA will assist the Consultant with coordination efforts for borings conducted with Port of Everett ROW • One (1) revision will be required for the ROW use permit application and approval process. • Boring locations will be accessible by truck- or truck-mounted drill rigs. • Boring locations will be located using handheld GPS and measurement from existing known features. • Utility locates, via the One-Call Utility Locate Center and private locator, will be comprehensive and accurate enough to allow reliable and safe location of borings. Vacuum extraction of borings is not included. • Geotechnical borings conducted through the roadway will be patched with rapid-setting concrete. No saw cuts and hot mix asphalt patches will be required. • All required rights of entry or permits will be provided by the others at no cost to HWA. • Soil samples will be collected from the borings using the Standard Penetration Test (SPT) at intervals of 2.5 feet. • All IDW will be drummed and transported to a nearby, City provided, location for storage until disposal of the IDW is approved and drums are removed for disposal. Waste profile paperwork for disposal of IDW will be signed by a representative of the City. Estimated Subcontractor effort and IDW disposal costs are for non-hazardous wastes. If analytical