20C - AA - AGMT - ENGINEERING SRVS

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t Storm Drain Master Plan Phase 2 I RrP Nta. 16-02 Michael Bakerwill use the revised flowrates based on Task 2B.2 to evaluate the effect on the storm drain hydraulics. The existing condition hydraulics will be used as a baseline to build the proposed alternative improvements. Final drainage solution alternatives will be prepared for City review and acceptance. Task 2BA Cost Estimate Michael Baker will perform capital and life cycle cost estimates for the identified most feasible LID drainage alternatives based on the recommendations in the above tasks and the City concurrence. A similar approach as outlined in Task 2A.3 will be used. Task 2B.5 Proposed LID Exhibits Once the selected sites and LID improvements are prioritized, Michael Baker will develop conceptual exhibits showing the location for each of the highest priority proposed sites and where each project resides relative to high priority flooding areas. These exhibits will contain an aerial background and a preliminary outline for the proposed facility along with its related storm drain system tying showing how it ties into the existing storm drain system. Task 2113.6 Present to the City Staff Once we have developed exhibits and cost estimates for each of the high priority potential sites our team will present the LID alternatives to the City. This presentation will include a summary of how the device will function, potential site constraints, constructability concerns, costs, evaluation on the multiple benefits each alternative provides including reduction in local flooding, any environmental or water quality benefit it may provide, economic benefits, social benefits, and the overlap it has in relation to grant requirements. Deliverable: 1. Technical Memorandum Summary 2. LID Alternative Map Exhibits 3. Cost Estimate TASK 2C — Cost Comparison and Prioritization Task 2C.1 Cost Comparison Michael Baker will compare the cost of the drainage improvements based Task 2A and Task 2B. A matrix will be prepared which will summarize the pros and cons and recommended alternative(s). Task 2C.2 Prioritization Matrix Michael Baker will prepare a priority matrix for proposed recommended improvement projects identified in Task 2C.1. Potential projects will be grouped in priority order based on current capacity deficiencies, constraints (such as if a downstream project must be completed before an upstream project), and opportunities (such as planned roadway improvement or redevelopment projects). Areas of high susceptibility to flooding and /or priority water quality treatment will be ranked highest along with areas based on infrastructure safety and revenue generation. Present worth cost estimates will be shown for each project identified. Key issues for each project will also be noted, such as major utility conflicts, construction issues, permits and property acquisition requirements, as well as other City concerns. Deliverable: Page 1 12 INTERNATIONAL 20C -26