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SCOPE OF SERVICES The purpose of the Davis Street Sewer Improvement Study is to identify and evaluate alternatives for rehabilitation, replacement, and consolidation of the existing sewer pipelines along Davis Street and the I-880 Freeway undercrossing. Approximately 2,700 feet of parallel 18-inch, 12- inch, and 8-inch sewers form a "corridor" that flows westward along Davis Street from Preda Street to Warden Avenue. Although these sewers are interconnected at several locations, their combined capacity for conveying flows under I-880 is believed to be insufficient. Several trunk and collector sewers flow into the Davis Street corridor from the north and south. closed circuit television (CCTV) surveys have revealed a number of problems in the existing sewers along the Davis Street corridor. Maintenance operations have removed significant amounts of debris, including asphalt, which indicates that sewer (and perhaps roadway subgrade) collapses may have occurred. In addition, two sewers that cross I-880 from northeast of Davis Street are known to be maintenance problems. The Consultant's scope of work for the study shall consist of the following tasks. Task 1 - Review Existing Information Existing documents and information relevant to the study will be reviewed. The City will be responsible for providing these documents to the Consultant, including previous sewer system master plans, soils information and previous geotechnical reports, CCTV tapes, manhole inspection reports, surveys of Davis Street sewers, traffic counts, available flow data, sewer maps and as -built drawings, and City and Caltrans roadway sections, geometry, and right of way and easement information. The need for additional information not available in the existing documents will be identified. Task 2 - Site Visits The Consultant will conduct 2 to 3 site visits to perform a visual assessment of surface features that affect the design approach. The assessment will include meeting with City staff, inspecting sewer manholes for cross connections and evidence of deterioration, and taking pictures of potential routes and topography. The site visit will assist in defining the primary issues associated with utility conflicts, restrictions to construction methods, access for maintenance, siting of potential crossings, traffic flow patterns, the potential for hazardous materials, and determination of feasible locations for new crossings and boring and receiving pits. E=IT A Pagel of 4 AGRE\EXHIBITA.DOC (Word 6.0)