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— Type A: Flood mitigations along these streams will be performed under the GBRA project, <br />therefore no additional effort is necessary. <br />— Type B : Each mitigation project from the 2007 FPP study will be updated for potential <br />mitigation projects using the revised hydraulic models. This will be a validation that the 2007 <br />mitigation projects are valid with the updated hydraulic models. (8 Projects) <br />— Type C : Each stream will be evaluated for potential mitigation projects. These projects will be <br />discussed with the City to gain input and support before proceeding with conceptual plans. (3 <br />Projects) <br />4.6. Conceptual Plans and Cost Estimations: Develop conceptual plans and opinions of probable <br />construction costs for the proposed flood mitigation projects. (10 Projects) For each selected project, <br />Halff will prepare a conceptual analysis of the flooding issues utilizing hydrologic and hydraulic <br />modeling as well as GIS data. One (1) concept mitigation plan will be prepared for each designated <br />project. A one (1) page base map exhibit and /or sketch of the subject area and proposed mitigation <br />design will be developed. This may exhibit may be CADD, GIS, or sketch. A narrative summary <br />(maximum 2 pages) of the proposed project that at minimum provides the project name, benefits of <br />implementation, history of flooding, environmental constraints, permitting requirements, potential <br />project partners, and conceptual opinions of probable construction costs. <br />— Type A: Nfinimal effort will be requited to ensure that the analysis from the GBRA study is <br />consistent with the analysis of the drainage master plan. <br />— Type B : Updates to the 2007 conceptual plans will be performed as necessary. Updates will <br />include the use of updated hydraulic models and updates for consistency with the drainage <br />master plan. <br />Type C : Conceptual plans and cost estimations will be generated for selected mitigation <br />projects. <br />4.7. Structure Inventory: Prepare structure inventory of stream crossings that identifies the frequency of <br />overtopping, the depth of overtopping, the average daily traffic counts (if available) and a <br />prioritization of this information for each structure. This format will be consistent with the GBRA <br />structure inventory. <br />Type A: A structure inventory will be prepared under the GBRA project, therefore no <br />additional work is necessary. <br />— Types B and C : Structures along each stream will be inventoried. <br />4.8. Flood iNIitigation Analysis Report: Following the completion of all flood mitigation tasks, a flood <br />mitigation report will be generated for use in the drainage master plan. This report will include <br />documentation of methodologies, assumptions, results, structure inventory, conceptual plans, and <br />cost estimations for all streams listed in Table 1. <br />TASK 5: STORM DRAIN SYSTEM ASSESSMENT <br />No effort will be performed by Halff under this task <br />TASK 6: RAPID CREEK EROSION ASSESSEMNT <br />To inventory storin water related issues in the City, this project includes a field reconnaissance effort <br />consisting of staff physically walking the creeks to identify and document issues. Field work will be <br />performed with an internet connected tablet computing device which allows for (1) instantaneous record <br />logging, (2) geocoded records and photographs and (3) field access to the City's existing mapping data. For <br />this task data will be directly posted to the Halff's ArcGIS Sever. Following completion of the field collection <br />process, Halff will deliver a copy of the database to the City. <br />Page 5of10 NO HALFFp <br />