Brown and Caldwell, Inc. 9/20/2023

PGSF WMVD Storm and Combined Sewer Design Scope of Work 08-25-2023 16 of 41 Category 2: Sensitive information Category 2: For official use only / disclosure permissible by law. results indicate hazardous wastes are present, IDW disposal may incur additional labor, time, and subcontracting costs. • Experience has shown that subsurface soil and groundwater conditions can vary significantly over small distances, and it is possible that other subsurface conditions and/or contamination may exist in areas that were not investigated. If contamination is discovered, it is likely that the data will not be sufficient for delineating the vertical and/or lateral extent of contamination or to provide an accurate cost estimate for soil and/or groundwater disposal during construction. • All geotechnical soil samples will be disposed after 6 months of being collected and environmental samples will be disposed of after 30 days. Long-term storage of soil samples by the Subcontractor is not included. • The City will facilitate Subcontractor and its subcontractors’ access to the planned borings. • Drilling will be accomplished during normal daylight workdays and hours, with at least a minimum of 8 hours available per day. • No PIT tests or EPA falling head (percolation) tests are included. • No permanent environmental groundwater monitoring is included. • The Draft Geotechnical Report will be delivered at the 30% design milestone. • The Final Geotechnical Report will be delivered at the 90% design milestone. • Phase 1 or Phase 2 Environmental Site Assessment will not be completed by the Consultant. • Design and implementation of any dewatering systems will be the responsibility of the contractor. Estimated flow rates provided under this scope are intended for planning level purposes. Everett Responsibilities • Coordinate access to non-City Right of way locations. • Provide storage for IDW. • Coordinate and pay for disposal of any identified contaminated IDW. Meetings • Team meetings as needed, up to 10. Work Products • Monthly status reports and invoices (e-mailed in PDF format). • Subsurface Exploration Plan (e-mailed in PDF format). • Draft and Final Geotechnical Report (PDF format). Phase 320 – Topographic Surveys and Easements Objective: to provide a basemap and surface terrain model for use with developing contract drawings. To provide temporary construction and permeant easements, as needed on private property. Survey work to be complete by a subconsultant, 1Alliance Geomatics. Activities/Approach: • Survey Control o This task includes the establishment of survey control as required for the project. Survey control will be referenced utilizing Real Time Kinematic (RTK) GPS (GNSS) and