1. PHASE 1 - Planning and research: 1.1. Meet with District staff to confirm scope of deliverables, schedule, and timing of the work. 1.2. Research existing as-built and record drawings, from local agencies. Obtain existing sewer and storm drainage inventory maps, existing GIS drainage layers provided by local agencies, utilities, and flood control district. 1.3. Determine existing private sewer/storm drain easements and responsible party. 1.4. Determine watershed areas and develop watershed boundaries as a GIS layer. 1.5. Present methods and alternatives to obtaining data and provide recommendations and analyses of the advantages and/or disadvantages of each if necessary. 1.6. Develop a plan for the collection of field data on the existing structures and pipes. 2. PHASE 2 - Collect/verify data on existing sewer and stormwater drainage system: 2.1. Inventory and survey sewer and stormwater drainage system including the following: 2.1.1. Type of drainage structure (i.e. curb inlet, manhole, box culvert, etc.) and material (concrete, brick, metal, plastic, etc.). 2.1.2. Drainage structure dimensions, rim/grate elevations, and invert elevations of inlets and outlet pipes. 2.1.3. Direction of flow thru structure (referenced from due north). 2.1.4. Apparent structural condition (rated on a scale of 1-5 or other rating system recommended by the Consultant). 2.2. Obtain pipe size, material type, and condition (rated on a scale of 1-5 or any recommended scale). 2.3. Pipe assessments will be done by visual inspection of each accessible pipe segment using a Quickview pipe camera or an equivalent alternate method. Conduct CCTV video inspection surveys of existing drainage facilities where pipe segments are too long or have a deflection such that the entire pipe segment is not visible from one end. Video files showing the visual assessment of each pipe end will be created. 2.4. Other relevant information (i.e. plugged with debris, lid missing, etc.). 3. PHASE 3 - Survey Deliverables: 3.1. All collected information shall be recorded using electronic form. Digital photos and digital video files of the pipe shall be linked to each structure or pipe record in the database. Digital copies must be provided with a reference number indicated on the information form. Consultant shall combine all structure inventory records into a single GIS database and provide a digital copy of the database files to the District at the completion of the project. 3.2. Any structures or pipes that cannot be located in the field or opened will need to be noted as not accessible. Structures or pipes that are clogged with debris such that adequate visual inspection cannot be performed will also need to be recorded. Upon receipt of this list, the District will determine how to proceed to complete the assessment on these structures.
