2021-01-25-minutes-public-works-study-session

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Attachment 1 to Amendment 2 — Scope of Work d. Settlement. An engineering evaluation is required to document that loss of freeboard due to long term settlement of the levee is not an issue. This analysis must address embankment loads, compressibility of embankment soils, compressibility of foundation soils, compaction methods, etc. Aspect engineers will complete this assessment using information and data from prior geotechnical reports, which is not expected to be significant issue or effort. e. Interior drainage. An engineering evaluation is required to document that drainage from areas interior to the levee is not a problem (verify that drainage from outside the levee will not pond up and cause flooding problems of its own). Aspect does not expect this to be much of an issue or require significant effort to complete. f. Levee System Operations Plan, Maintenance Plan (OP & MP). These plans must be provided to support the levee certification request. There are specific requirements for each plan and the City may already have an OP & MP for the lower levee. FEMA requires them to be adopted by council and signed by the City Manager. Aspect assumes that the City will put these together. In addition to the above technical reports, a FEMA certifiable connection between the lower Reecer Creek Levee and the 1-90 Reecer Creek Bridge will be needed. Aspect has developed a preliminary concept that involves tying the lower levee into the ecology block floodwall that passes through the bridge along the pedestrian pathway. While the ability to meet all certification requirements at the 1-90 bridge is currently uncertain, Aspect recommends initiating the connection design effort and engaging with FEMA about certification requirements during the process. Scope of Work The Amendment 2 Scope of Work provided below addresses: ✓ Amendment 2 Task 1— Complete 90% Design Package for Lower Levee to 1-90 Bridge Connection. ✓ Amendment 2 Task 2 — Prepare Final Design Package and Bidding Documents for Lower Levee to 1-90 Bridge Connection. ✓ Amendment 2 Task 3 Prepare Levee Technical Report to Support Certification and CLOMR Process. ✓ Amendment 2 Task 4 — Additional Coordination with City, County, and FEMA During Design and Levee Certification and CLOMR Processes. ✓ Amendment 2 Task 5 — Management Reserve Fund Aspect's project management time is embedded in each task. Amendment 2 Task 1: Complete 90% Design Package for Lower Levee to 1-90 Bridge Connection Aspect will develop a 90% Design Package for the lower levee to 1-90 bridge connection. Aspect's Task 1 services include: Reecer Creek Floodplain Mapping and Levee Certification Support Services Project 2 1 Page