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Scope of Work <br />City of Everett 553-1844-833 <br />Land Capacity Analysis - Surface Water 4 June 2024 <br /> <br />Approach <br />Parametrix will update the stream buffer mapping conducted as part of the North Creek SMAP analysis <br />to include the proposed growth alternative GIS data and provide a qualitative summary of potential <br />impacts of each alternative based density of development in proximity to natural water bodies. <br />Assumptions <br />• The GIS mapping update will support qualitative/observational evaluations of each alternative. <br />• More detailed analysis methodology may be developed and implemented for additional fee <br />under a later schedule. <br />Deliverables <br />• A stream buffer layer on the Project Web Map. <br />• A section and figures in the Project Technical Memorandum discussing proximity of proposed <br />growth to natural water bodies. <br />TASK 5 – HISTORICALLY IMPACTED RUNOFF <br />Measurable Objective <br />The Washington State Department of Ecology has mapped areas in the state that have had over 40% <br />impervious (hard surface) cover for about the last 40 years and has set different flow control <br />requirements for these areas based on the idea that the water resources have already been impacted by <br />the long-term development. One of these mapped areas is Everett. (Runoff from this historically <br />developed area is predominantly already managed by the City’s combined sewer system.) Focusing new <br />development in areas that have already been significantly modified by historical development is <br />expected to have less impact on the already changed water resources. In contrast, avoiding further <br />development in areas that are historically less developed will result in less impact to surface water <br />resources (even when new development is compliant with current stormwater management codes). <br />This task is intended to provide a qualitative analysis of each proposed growth alternative based on <br />proposed growth inside and outside of the historically impacted area. <br />Approach <br />Parametrix will generate a map layer depicting Ecology’s areas already impacted by historical <br />development to compare against the proposed growth alternative GIS data. Parametrix will provide a <br />qualitative discussion of potential impacts of each alternative based on proposed growth inside and <br />outside of the historically impacted area. <br />Assumptions <br />• The GIS mapping update will support qualitative/observational evaluations of each alternative. <br />Deliverables <br />• A historical development layer on the Project Web Map. <br />• A section and figures in the Project Technical Memorandum discussing proposed growth inside <br />and outside of the historically impacted area.