2006/05/17 Council Agenda Packet

EXHIBIT A-3 SCOPE OF WORK • • Lateral capacity • Settlement performance • Corrosion potential • Construction considerations 2. Seismic design parameters for HDD and Transition Sections (ZZA) • Regional seismicity • Seismic hazard analyses • Site response analyses — Equivalent linear — Nonlinear • Liquefaction analyses • Ground deformation analyses — Vertical settlements — Horizontal displacements • Soil-pile interaction analyses • Impacts on pipeline — Ground shaking — Deformation(Relative and absolute) • Geotechnical parameters for use with UBC, as appropriate 3. HDD Section • Coordination of geotechnical issues between the two geotechnical design subconsultants. (ZZA and BSE) • Review alternative pile support platform for HDD drill rig located at the west transition section. (Z7A and BSE) • Conduct hydro fracture calculations for both pipelines to determine the minimum depth of cover required. (BSE) • Develop drilling procedures to mitigate wetland drillings impacts. Establish mitigation procedures for hydro fracture event to meet permitting agency requirements. (BSE) • Review and provide engineering design recommendations on the following items: drill rig thrust block design, deep conductor casing installation, pilot bore and ream drilling sequence for twin installations, steel pipe breakover and setback distances, hydraulic and pneumatic thrust assist, drill fluid pressure monitoring, steel pipe staging and welding requirements, steel pipe filling and testing. (BSE) 4. Buried Pipe Section (ZZA) • Temporary excavation slopes and shoring. • Construction dewatering • Foundation support including settlement estimates • Bedding and backfill • Corrosion potential • Construction considerations 53 MWH Page 13 EVERETT PHASE 6 HDD PROJECT 5/1/06 EXHIBIT A-3—SCOPE OF WORK