Brown and Caldwell, Inc. 9/20/2023

PGSF WMVD Storm and Combined Sewer Design Scope of Work 08-25-2023 35 of 41 Category 2: Sensitive information Category 2: For official use only / disclosure permissible by law. required dewatering. • Select a grout mix that is acceptable to BNSF that will be later incorporated into the specification. • Identify risks inherent with trenchless installation and mitigation strategies that will be included in the design to protect the BNSF asset. • Develop minimum qualification requirements for the trenchless contractor performing the casing installations. Task Assumptions • STC will coordinate with B&C when evaluating casing requirements for the system hydraulics to ensure that the pipe diameters and depths that are selected for the conveyance pipelines are met without the need to obtain a variance from the RR. • STC will provide information to the B&C design team about selection of the appropriate casing size and wall thickness required to meet the conveyance pipeline design and satisfy the permitting requirements with flexibility to allow future minor modifications of the design. • STC will prepare the memo with input and review by ESA Associates who will lead the BNSF permitting efforts to ensure that all exhibits within the TM are consistent with the permitting figures and provide all necessary information to allow permit issuance. • A minimum of two meetings will be held with B&C and ESA to coordinate the permit submittal. Everett Responsibilities • Review permitting TM, permit application, and supporting documentation Meetings • As required Work Products • STC will prepare a BNSF permitting technical memorandum that will accompany the permit submittal. This TM will detail the installation method and the planned location of the crossing. The TM will summarize the results of the railroad analysis and will include details on planned specification requirements, risk mitigation, grouting procedures, estimated settlement and activities to detect settlement prior to the casing crossing beneath the tracks. The TM will be submitted in Draft and Final format, incorporating reviews by B&C and ESA. A comment tracking and response log will be maintained to reflect changes in the document between Draft and Final Stages. Final Design Phase 600 – Final Design Management Objective: The objective of this phase is to manage and direct the design process so that the products of the design effort are contract documents suitable for construction and reflect the City standards and preferences. The design process will be managed to provide complete, coordinated, and consistent designs between facilities and disciplines. Phase 400 sets the basis for this task and all products and activities will be updated as appropriate.