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o City of Everett,WFP PLC 135-12589-12002 Additional Services EXHIBIT Al SCOPE OF WORK To maintain system operation, to satisfy newly developed buy-off protocols for the PLC replacement work,and to further enhance and support the networking and computer systems;Tetra Tech has been requested to provide this Proposal to perform additional work beyond the original Scope of work in order to complete the project.This Proposal is offered to obtain fair and reasonable compensation for these additional efforts. Additional scope items for Everett WFP PLC Replacement Project: TASK 11 Additional meetings: We anticipate the need for additional on-site weekly meetings in order to more fully coordinate with the contractor and plant staff. These meetings are at either the Contractor's place of business in Everett,or the WFP. Based on current meeting frequency, we anticipate a total of 56 additional meetings through the conclusion of the project. TASK 12 Documentation of Program Comparisons Includes additional effort beyond the basic scope of work to perform Line-by-Line comparison of the AB programs migrated from distributed control panels to the centralized AB Master PLC program and develop a technical memo indicating differences and other findings.These original AB PLC routines were developed outside of Contracted services.This included line-by-line comparison for PLC programming in the following Phase 1 areas: Hypochlorite, Flocculation, Chemical Feed, Backwash Pump Station,Water Quality, Fluoride, Portal 4,Soda Ash, Recovered Water, Finished water pump station 1, and TI Master MCP. Detailed efforts included: ■ Visually compare side-by-side verification that all routines and logic rungs are properly migrated from distributed PLCs and that they are fully represented within the master PLC logic. ■ Ensure that routines and system Tags avoid potential naming conflicts due to consolidation ■ Verify scaling,timer preset values,etc.are not affected by the consolidation ■ Compare before and after ladder logic rungs within applicable subroutines observing that"local"addresses are updated to corresponding remote addresses where used.Also,observe that aliases to local and remote addresses within the global tag list maintains rack,slot and channel positions. ■ Extract.CSV files for all tags within the old and new PLCs, obtain the DB2 Data Block file from Wonderware®and develop a comparison worksheet for each unit process area. Comparisons will use VLOOKUP within MS Excel to ensure that tags present within the original programs are also present within the September 28, 2016