Brown and Caldwell Inc. 2/3/2022

Port Gardner Storage Facility Scope of Work 1-06-22 ■ Structural fill • Seismic considerations • Perform and manage survey subconsultant services to support the demolition and design of the PGSF.The survey area will be limited to the Kimberly-Clark WWTP property. Specific tasks to be carried out by the survey subconsultant include: o Perform topographic field survey of the KC property and north parking lot. Survey shall include but is not limited to the following: • Identify existing utilities, improvements, man-made features, roadways, boundaries, critical elevations, existing structures, natural features, and grades within the limits of work.The field survey shall include enough detail to produce a base map with boundary information, contours, and other topographic information. o Establish horizontal and vertical control points based on the project's control system and information for contract documents including survey points, a basis of bearing, benchmarks for vertical control, and datum information for development of base mapping. o Laser scanning of existing site buildings and infrastructure and development of 3D model of existing conditions. o Provide pothole surveys to identify the location and crown elevation of existing buried piping. o Provide an equation to convert elevations from the 1988 NAVD, 1929 NGVD,and the old mill datums used for the 1980 record drawings to allow for conversion of elevation callouts from older drawing sets. • Perform and manage subconsultant services for inspection of existing buried yard piping to inform the demolition and design project phases. o Condition assessment of site process and yard piping including the following: • 36-inch diameter neutralization basin to aeration basin distribution piping • 32-inch diameter effluent pipeline • 18-inch diameter aeration basin drain lines • 54-inch diameter aeration basin to secondary clarifier line • 36-inch diameter Secondary clarifier to effluent pump station pipeline • 30-inch dimeter sludge recycle pipeline • 36-inch and 42-inch diameter influent transmission lines. • Piping associated with the north parking area catch basin o Verify materials of construction for process and yard pipes inspected under this phase. o Develop a condition assessment report summarizing the findings of the pipeline investigations to inform project demolition and design. • Manage subconsultant services for structural/material testing of the existing structures. • BC conducted structural and process mechanical condition assessment of the neutralization basins. 8