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recommended facilities. The lengths and elevation data will be used for detailed hydraulic analysis and cost estimating purposes. Recommended drainage improvements to remove hydraulic deficiencies of the municipal storm drain systems will be analyzed in CivilStorm, developed in the previous tasks to verify operation. The precise sizing of the modifications to the existing storm drain sizes will be adjusted using the water surface profile model to optimize the performance of the system. Deliverables: 1. Proposed Improvements Maps (1"=1000' scale) Task 3.5 Preliminary Drainage Facilities Quantity and Construction Cost Estimate Preliminary construction quantity estimates will be performed for the identified feasible drainage alternatives. A preliminary estimated cost of construction will be generated from the quantity estimate using approved unit costs from the City. Unit costs will be based upon the most current cost information for recent similar projects in the area compiled by RBF and approved by the City. The total project costs for each alternative will then be estimated which include line items for project design, survey, geotechnical, administration and construction support. In addition, intangible costs for alternative systems will be investigated, such as environmental mitigation, if these are determined to be critical for a particular system. Major physical constraints will be included in the estimate such as (1) land acquisition, (2) street paving and traffic control, and (3) utility relocation or protection. Deliverables: Quantity and Cost Estimate Tables TASK 4 - MAPPING Task 4.1 Update Drainage Facility Database RBF will deliver updated ESRI map files (.mxd) for the ESRI ARCGIS Geodatabase of the existing drainage facilities within the project limits based upon previous GIS database, utility inventories, as-built drawings obtained from the City, and a reasonable number of field verifications. The information from existing documentation will be field verified by observation only or aerial photographs. Facility inventory will also include existing facilities by other agencies, i.e. Caltrans. The data accumulated will include size, material and age of the drainage facility. All reference drawings will be obtained by RBF from the City, County, and Caltrans. Due to the unknown nature of this work, a budget estimate of 90 hours is included in this proposal. Deliverables: 1. ESRI map files with updated data Task 4.2 Background Information Input RBF will upload the existing background data available from the City and County. Data will include a rectified aerial photograph, City and County storm drain data, and land use data. This task includes updating the existing horizontal alignment to include a full vertical network for use in the CivilStorm hydrodynamic model (Task 3.1). Because the extent of the effort to build the network is unknown at this time, a budget of 180 hours has been reserved for this task. Deliverables: 1. Base Mapping Data to be used in Report Exhibits 2. Pipe network vertical data input into CivilStorm 25 r 20C-26