Natural Systems Design 3/27/2023

NSD will also evaluate any information gaps and identify opportunities to fill those gaps through desktop analysis in an effort to reduce the level of fieldwork required in subsequent project phases. NSD will also identify areas in need of fieldwork such as known crossings in need of passability assessments, habitat assessments, and/or other information gathering such as fill above the culvert. This information gathering and identification of data gaps will support the compilation of obtainable metrics about each crossing and its habitat that will be used in the development of the preliminary barrier correction prioritization in Task 2. NSD will also develop methodologies for assessing complex crossings that do not fit the WDFW Level A and Level B assessment criteria. Methodologies will be based on existing regulations, WDFW guidance documents, and the scientific literature. Since these complex crossings can span a range of different crossing types, NSD will identify groups of complex structures that share similar attributes and can potentially be assessed with the same methodology (i.e. drop structures, intersecting pipes, culverts with slope breaks in profile, etc.). NSD will draft proposed assessment methodologies for up to three of these groups. Assumptions: The City will provide NSD with their existing crossing inventory upon which the comprehensive database will build. The City will also provide any relevant GIS files and ancillary data. All data packages should be received by NSD within 7 business days of the City’s Notice to Proceed on Task 1. The City will continue to host the final database. Crossings beneath City owned infrastructure, yet outside of city limits, may be included in the inventory if such information is already known or available in public databases, but will not be included in the preliminary prioritization. Private landowner crossings that occur within city limits may be included in the inventory if such information is already known or available in public databases, but will not be included in the preliminary prioritization. Assessment results for fish passage through complex culverts are not included in this scope of work. Borescope inspection by additional civil engineering firms may be required for the assessment of long or complex crossing structures. Borescope inspection is not included in this scope of work. Landowner and stakeholder outreach will not be conducted by NSD. No fieldwork will be conducted in Task 1. Deliverables: Geospatial database with comprehensive inventory of existing, available crossing information, including identified information gaps and any additional metrics derived from remote sensing analysis. (NSD can temporarily upload geospatial databases to ArcGIS Online and export attribute tables into Microsoft Excel spreadsheets at City request). Written proposed methodologies or recommendations (whichever is deemed most appropriate) for assessing complex culverts for fish passage of up to three groups of structure types. Budget: $21,800