Amendment 2 Tetra Tech Inc. - Laserfiche WebLink

City of Everett,WFP PLC 135-12589-12002 Additional Services migrated master program, will present corresponding Wonderware®tags, and will highlight ail tags between the PLCs that no longer match. TASK 13 PLC Program Documentation Additional reverse-engineering effort required to resolve missing or otherwise inaccurate legacy documentation(Tag and ladder rung descriptions)within the original TI 545 alternate backwash program. Efforts include: • Program reverse Engineering efforts to determine program functionality for the Alternate Backwash Program. • Develop coordinated timing diagrams for cascaded timers which do not have functional descriptions • Trace down individual contacts which have missing or otherwise inaccurate tag name descriptions(number of tags could be in excess of 100 ea). Develop new descriptions for contacts and rungs which are lacking this information. TASK 14 Additional Start-up and Commissioning Assistance Validation efforts beyond basic start-up and commissioning assistance estimated in the base Contract. Estimated efforts within base contract Proposals included minimal effort to assist the Contractor during their startup efforts. Detailed Commissioning and documentation were not anticipated.Additional efforts for this task include the following: • Provide services with on-site Tetra Tech personnel to implement field observation and detailed documentation for validation/sign-off related to I/O tag checkout. I/O Tags are verified functionally from the field instruments to the PLC and from the PLC to the SCADA HMI system. • Provide services with on-site Tetra Tech personnel to implement field observation and documentation for validation/sign-off related to functional system-level testing of automated processes,interlocks and equipment. Functionality to be verified for applicable modes of operation including local manual, remote manual and automatic. TASK 15 Troubleshoot and Resolve Network incompatibilities Troubleshoot and resolve existing N-Tron Switch issues which are causing a "data- storm" instability effect within the network. • Troubleshooting the network issues; it is assumed based on current evidence that incompatible firmware versions and outdated existing hardware are destabilizing the network any time the redundant network ring is fully closed. • Quality Controls Company(QCC)working under a separate Contract with Seahurst Electric will obtain updated firmware for N-tron Switches. • QCC working under a separate Contract with Seahurst Electric will implement corrective efforts to include flashing firmware on several switches. September 28, 2016