2006/01/11 Council Agenda Packet

5 areas. Where existing record information is insufficient,additional geotechnical study shall be conducted. To the extent possible, existing information from recent geotechnical studies performed for the East Marine View Drive roadway improvement project(HWA GeoSciences)and previous sewer replacement projects will be used. A detailed scope of the geotechnical study to be conducted by HWA GeoSciences Inc. is included as an attachment to this scope. The Contractor (geotechnical engineer) will be responsible for obtaining any permits and/or providing traffic control for any additional geotechnical investigations. The City will be responsible for paying any permit fees associated with the geotechnical work. The City has also volunteered the use of a City backhoe and operator for test pits in the NE area. Task 4— Design This task involves data gathering, preliminary design, preparation of plans, details, specifications and contract documents suitable for public works permitting, bidding and construction. Contract documents will be prepared in a standard package suitable for bidding and construction as one project however, the Northeast project area (interceptor in Jackson Park) may be removed from the package and combined with the East Marine View Drive roadway improvements project. Consequently, the Contractor will prepare documents that can be adapted to either scenario. Designs for replacement combined sewer pipes may involve pipe diameter changes(increases), pipe slope modifications and minor location adjustments. Designs will also provide for alley restoration consisting of asphalt pavement surfacing that provides positive drainage control and appropriate edge elevation matches to existing garages, driveways etc. It is anticipated that all pipe replacements can be accomplished by conventional open cut methods. Initially, the Contractor will coordinate with the City to receive technical input and to define the specific design objectives for the overall project. It is anticipated that some technical options or alternatives for sewer replacement or surface restoration may be identified, those options or alternatives will be outlined and evaluated at approximately 30% design progress so the City can make a decision on the preferred approach. Contractor Responsibilities: 1. Gather and Review Data Resources: Workshop meeting with the City to review maintenance and inspection logs. Confirm known problem areas and identify the types of deficiencies, defects and problems that are necessitating the pipe replacement. Obtain GIS (IDS) data from the City and develop preliminary mapping and databases for the project. Obtain copies of as-built record drawings for existing water and sewers in the project areas. Obtain information about other current or proposed projects in the area (e.g. East Marine View Drive etc.) and receive direction from the City on any constraints and coordination requirements. 2. Cursory Field Reconnaissance: Field inspection of the overall project area to examine/verify surface improvements and to inspect manholes and general condition of pipe flow. 3. TV Sewer inspections: Review videotape of CCTV inspection of sewer mains lateral connections and storm drains etc. produced and provided by the City. 4. Design of Pipes: Based on direction from the City,the Contractor will utilize pipe sizes and slopes for the proposed new mains in the project area. Pipe designs will attempt to make improvements in flow velocities in order to minimize solids deposition during normal flow conditions and to convey estimated peak flows without surcharging. The City and the Contractor will jointly review pipe material options and will decide on the pipe material for each pipe reach. Sewer System Replacement"H" Dec 16,2005 1 6 Amendment 3,Scope of Services Page 7 550502(UP3206)