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City of Everett Sevre1'Regulators R4 and R39 Modifications EXHIBIT A-1 SCOPE OF SERVICES Background The City of Everett, Washington (City) has selected BHC to provide engineering analysis, design, and permitting assistance for modifications to Sewer Regulators R4 and R39. Modeling analysis suggests Regulator R4 is diverting excess wet weather flow from the Summit Interceptor system to Lift Station 32 and contributing to CSO events at SRO4. Also, the gate structure (R39) at the upstream end of the Summit Tunnel is surcharging in a manner that causes excess wet weather flow to overflow to Lift Station 32 and SRO4. The improvements resulting from this project are expected to maximize the conveyance capacity of the Summit Avenue Interceptor and the Summit Tunnel and would reduce wet weather flow rates to Lift Station 32 and potentially bring SRO4 into regulatorycompliance. Additionally, Regulator R4 has the future potential to be converted to a "flow-splitter" to divert Stormwater, proposed to be separated within Basin NC, directly to the Snohomish River. The City desires to have this capability to address future CSO control issues. BHC performed preliminary design services which included hydraulic modeling and options analysis. This work was summarized in the R4 & R39 Hydraulic Analysis and Upgrades Report, June 2016. The preliminary design recommended several improvements: • Replacement of the R4 structure — the new R4 structure would provide overflows to the existing 30-inch bypass pipe in Chestnut Street and would have the ability to be used as a flow splitter for future stormwater separation. • Modifications to R39 —The existing R39 structure would be modified to adjust weir heights and provide better access. • Stormwater separation —The preliminary design recommended stormwater separation in the Cleveland Street basin and Basin NC.. This recommendation is being addressed by the City and is not included by this scope of services. Scope of Services Task 1 — Project Management and QA/QC Objectives Monitor, control and adjust scope, schedule, and budget as well as provide monthly status reporting, accounting, and invoicing. BHC Services 1. Coordinate and manage the project team. 2. Subcontract with and manage project subconsultants. 3. Prepare monthly status reports describing the following: a. Services completed during the month b. Services planned for the next month c. Needs for additional information d. Scope/schedule/budget issues s Scope of Services 2 •3 ■ CONSULTANTS