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State of Washington Department of Ecology <br />Agreement No: WQC-2023-EverPW-00118 <br />Project Title: Regional Stormwater Facility Planning <br />Recipient Name: City of Everett <br />SCOPE OF WORK <br />Task Number: 4 Task Cost: $98,576.00 <br />Task Title: Develop Conceptual Design <br />Task Description: <br />The RECIPIENT will develop conceptual designs and cost estimates for at least five regional facilities. <br />Page 13 of 46 <br />A. The RECIPIENT will develop conceptual project designs in accordance with the Stormwater Management Manual for <br />Western Washington. <br />B. The RECIPIENT will complete site visits at each site for verification of contributing basin areas, evaluation of site <br />conditions, and potential design challenges not previously evident. <br />C. The RECIPIENT will complete hydrologic modeling for stormwater facilities sizing using the Western Washington <br />Hydrologic Model and will estimate conveyance hydraulic constraints directly downstream of the facility based on available <br />field and GIS data. <br />D. The RECIPIENT will evaluate BMP alternatives for facility recommendations based on refined site constraints. <br />E. The RECIPIENT will evaluate adaptive management options for the proposed facilities based on current and anticipated <br />redevelopment within the contributing basin, expansion opportunities and maintenance considerations. The RECIPIENT will <br />draft an Adaptive Management Plan for ECOLOGY review and acceptance. <br />F. The RECIPIENT will complete one Conceptual Design Report to include summaries for at least five regional facilities for <br />ECOLOGY review and acceptance. Allow 45 calendar days for ECOLOGY review. <br />• The RECIPIENT will upload the conceptual design submittals to EAGL for ECOLOGY review. Design figures will be <br />reduced to 11x17 inches in size and be legible. The submittal will include the items listed below: <br />o Sizing of Stormwater Features - Estimated size of regional facilities for treatment and flow control. <br />o Summaries - For each regional facility, provide a summary of: <br />- The existing conditions and recommended conceptual design strategy for stormwater conveyance modifications, regional <br />facilities, and shared spaces. Identify areas where the typical strategy will be modified to address physical site constraints. <br />- Identify subsurface variation with potential impacts to the site recommendations and provide a brief description of <br />subsurface testing needed to complete the design. <br />- Concept level exhibits based available on GIS and aerial data of the design strategy in both plan and schematic <br />cross-section views. <br />- Refine the cost estimate(s) to address any changes identified during the development of the conceptual design. <br />Task Goal Statement: <br />The RECIPIENT will complete all conceptual design tasks and respond to ECOLOGY comments in a timely manner. <br />Task Expected Outcome: <br />An Adaptive Management Plan will be completed based on site specific considerations. This Plan will inform the development <br />Template Version 12/10/2020 <br />