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REV: 3-24-2023 RL limited to: improvement plans, engineering studies, available right-of-way documents, environmentally sensitive areas, City Standard Specifications, Details and Design Criteria, codes, ordinances, and policies pertaining to the proposed project design. Consultant shall also collect any available as-built drawings and utility map data and contact other utility companies to obtain underground utility information. 2.1.2. Investigation of Existing Utilities Consultant shall identify potential locations for isolation valves. Consultant shall contact utility companies to obtain the underground utility information at the proposed valve locations. Consultant shall conduct a site visit to identify any problematic areas and possible utility conflicts based on visible surface evidence to determine the extent of survey work. 2.1.3. Topographical Survey Consultant shall perform a GPS-based topographic survey as required at each proposed isolation valve location to identify surface conditions, utilities, structures, and any pertinent infrastructure. Consultant shall perform conventional ground surveys using GPS RTK survey. The survey will include physical features such as curb, gutter, sidewalk, manholes, catch basins, utility structures, water valves, and underground utilities. Prior to scheduling the field survey, Consultant shall contact USA North (811) to mark all dry and wet utilities. Consultant shall use readily available GIS or roadway and/or subdivision maps to approximately locate the right-of-way and property lines relative to the sidewalk on the topographic map. Horizontal and vertical control will be based on California State Plane Coordinates and established City benchmark datum, e.g., street monuments. 2.1.4. Utility Locating and Potholing Consultant shall confirm vertical profile of existing utilities that are perceived to be in conflict with proposed installation of the isolation valves. Consultant shall dip gravity systems (e.g., sewer and storm) and GPR/ pothole pressure lines (e.g., water and gas) and dry utilities (e.g., electrical and communication). Consultant shall select utilities that need field verification based on information gathered during site investigations, utility research, and the topographic survey. The selected critical utilities may include utilities not shown on record drawings or if conflicts with proposed work are perceived. Consultant shall initially perform GPR survey to reduce number of potholes required to confirm the depth of selected critical utilities. Based on GPR survey results, Consultant shall develop a potholing plan for locating and profiling existing underground utilities and have the plan approved by the Public Works Services Director or designee prior to commencing ATTY/AGR.2023.062/BKF Engineers (Redwood Shores Isolation Valve) (Page 12 of 17)