DATA COLLECTION AND REVIEW Review existing sewer system maps, GIS data, flow records, and past I&I studies. Identify data gaps and recommend additional data collection needs. 4.3. FLOW MONITORING Install and maintain flow meters at a minimum of 12 key locations in the collection system for a period of 8 weeks, including wet and dry weather conditions. Correlate flow data with rainfall and groundwater levels to quantify I&I contributions. 4.4. FIELD INVESTIGATIONS Conduct manhole inspections (minimum 100 manholes) to assess structural condition and identify inflow sources (e.g., leaky covers, cross-connections). This will include a inspection of the inverts. Current and past CCTV inspections may be able to be provided to the bid winner by the Sewer Line Maintenance Division (SLM). If no CCTV inspections can be provided at a location, perform closedcircuit television (CCTV) inspections. This could be of at least 20,000 linear feet of sewer pipes to identify infiltration sources (e.g., cracks, faulty joints).
