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Kimley»>Horn Page e Owner officials and authorities. T2ue will compile a list of all utility companies contacted for information and note information received with contact information for each response and note non -response if applicable. Field Utility Investigation (Utility Designation) T2ue will utilize appropriate surface geophysical techniques to determine the approximate horizontal position of utilities within the project area. Once designated (horizontally positioned), verified utilities are marked using appropriate pink paint and flagging which is the standard industry color for temporary survey markings. Utility type or ownership that cannot be confirmed by the field investigation will be termed "unknown". T2ue will utilize a suite of equipment including pipe and cable locators (PCL), Ground Penetrating Radar (GPR), magnetometers, and detectable sondes. If accessible, structures connected to gravity -fed systems will be opened, and inverts will be measured. Invert information and, where accessible, pipe size/material for the sewers will be collected at manholes/catch-basins from the surface and shown on the drawings accordingly. The alignment of the sewer pipes will be shown on the drawing based on a combination of record information received, results of the invert investigation, surveyed manholes/catch- basins, and professional judgment. If chambers are full of water or confined space entry is required, extra costs will be incurred and will be discussed with the Client in advance. Survey T2ue will survey the utility designation marks and utility appurtenances referenced to the project survey controls. The results of this utility investigation and any survey work performed in conjunction with the investigation will be tied to the project datum as specified by the client and existing survey grade control points provided to T2ue for their use if available. In the absence of direction from the client or a control diagram, T2ue will choose a Local Coordinate System based on either local or NAVD88 vertical datum. T2ue will prepare a survey as depicted within the Project Limits. The following information will be located and obtained for specific visible utilities where access is possible and safe for personnel: • The alignment of non -visible underground utilities based upon the survey of surface designations (markings) as performed by T2ue. • Location of visible surface evidence of the various utility systems, such as utility poles, manholes, inlets, catch basins, culverts, valves, and fire hydrants. • The location of each main, pipe, conduit line, and other structures will be indicated based upon safely observable evidence. • Sanitary and Storm Sewers: Rim and invert elevations and/or flow of all manholes, inlets and catch basins. • Water Mains: location of all valves and hydrants. • Gas Mains: location of valves. • Telephone pedestals, electric pedestals, and transformers. • Other visible utility surface features. • The alignment of non -visible underground utilities based upon the survey of surface markings by an underground utility locating service or utility companies. • The Horizontal datum will be based upon Colorado State Plane North coordinates. • Vertical datum will be based upon NAVD 88 (North American Vertical Datum of 1988). kimley-horn.com 11800 Ridge Parkway, Suite 200, Broomfield, CO 80021 303 228 2300