Otak 11/23/2020 - Laserfiche WebLink

1. Identify the designated uses and desired water quality conditions. Update the tables and narrative of designated uses, water quality standards, and impairments to reflect Ecology's 2016 Water Quality Assessment and 303(d) List. A water quality section and designated uses and desired water quality conditions tables will be added for basin plans (e.g. Marshland Tributary Basin Plan)where they don't currently exist. Develop the table and narrative for each of the two new basins. 2. Gather and analyze landscape-scale data (land use and cover, road density, zoning) that help explain and predict receiving water conditions. 3. Review the 2017 SWCP and Everett's monitoring data analysis in 2020-2021 to determine whether TSS, fecal coliform, nutrients and metals are pollutants of concern. 4. Assess the development pressure in each basin, such as: a. How much growth is being directed toward each basin, based on growth plans within each basin, and future zoning data. b. How transportation planning is likely to affect each basin. 5. For basins that discharge to impaired waters, identify and summarize: a. Sources/activities that are the main contributors to the pollutant load targeted for reduction (e.g., polluting activities associated with particular land use or land cover types)while accounting for existing stormwater BMPs. This will be a qualitative analysis and will be documented as an update to the pertinent sections of the SWCP. b. Whether or not conditions relating to these pollutants in the receiving water may be managed or improved through the use of stormwater management techniques. 6. Mapping of information related to overburdened communities using USEPA's EJ Screen and the Washington State Department of Health Washington State's Health Disparity Map and providing a brief narrative in each basin plan. Assumptions • For basins where there is more than one receiving water(e.g. Marshland Tributary Basin Plan), only one will be picked based on a discussion with Everett to be representative of all the receiving waters in the basin. All the analyses for the basin plan will be with respect to the representative receiving water. • The draft methodology will be applied to a "pilot" basin, reviewed with the City, and then the approved methodology will be applied to the remaining basins. • The City will provide GIS data of the storm system, existing stormwater BMPs, basin areas draining to BMPs, zoning, and impervious surface layer. • The City will analyze the baseflow monitoring data and update water quality tables comparing baseflow data with water quality criteria in each basin plan in advance of Otak beginning this step. • The City will provide information on future land use and development pressures in a simplified map per watershed, showing basin boundaries, development/redevelopment categories (e.g. commercial, residential, etc.), and location. • New section on development pressure in each basin will be approximately one paragraph. • Septic failures and illicit discharges will not be considered for this analysis. • There will be two rounds of reviews for the update to one"pilot" basin plan to confirm the writing style and the style of graphics chapter, and the approved writing template will be applied to the remaining basins that will undergo one round of review. • The City will consolidate and screen comments from reviewers to provide basis of direction to Otak Deliverables Otak • Update/add designated uses and Water Quality Criteria table where applicable. Update/add narrative in respective basin plan to reflect changes. • Update impervious area in the Section titled Existing Land Use in each basin plan. Receiving Waters Assessment and Update of Surface Water Comprehensive Plan 4 Scope of Work Otak