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EXHIBIT A-2 I <br /> U SCOPE OF WORK " <br /> Task 4. Supplemental Geotechnical Investigation <br /> This task is to prepare a supplemental geotechnical evaluation to support the Alternatives <br /> Evaluation. The supplemental geotechnical investigation work will proceed only upon <br /> authorization from the City at their discretion. <br /> The supplemental geotechnical investigation task includes the following: <br /> A. Field Explorations. Complete a site visit to the Phase 6 project site to observe existing <br /> geologic conditions, and obtain the following additional field information. <br /> 1. Drill and sample up to four borings with a portable Acker type drill rig. The drill <br /> sites will be distributed along the alignment of the possible at-grade road and <br /> accessed from the walkway. Each boring will be drilled to a depth of <br /> approximately 30 feet. Observe and record lithology, physical characteristics of <br /> materials, groundwater, sample locations and recovery, etc. <br /> 2. Prepare geologic profiles and sections including field developed topographic cross <br /> sections of the dikes at two locations. The sections will be developed at the same <br /> locations as the two previous borings drilled in the dikes by ZZA. The field <br /> developed cross sections will be limited to the portion of the dike above water. <br /> B. Lab Testing. Select soil samples from the field exploration for laboratory testing in order to <br /> characterize the engineering properties of the soils. The laboratory tests will include organic <br /> content, moisture content, dry density, gradations, Atterberg limits, shear strength, and <br /> consolidation. <br /> C. Geotechnical Engineering Analysis and Evaluations. Identify and provide preliminary <br /> evaluation of geotechnical design parameters and development of constraints for the various <br /> alternatives considered. Provide preliminary geotechnical recommendations regarding the <br /> feasibility of the alternative construction methods for pipeline design for Phase 6. The <br /> following specific issues will considered as part of the alternative evaluation. <br /> 1. Extended use of an at-grade road at the east and west ends of Phase 6 to the extent <br /> practical as a possible method for material supply. <br /> • Optional road materials (geofoam, etc) <br /> • Settlement <br /> • Bearing capacity <br /> • Construction considerations <br /> 2. Buried pipeline along south side of dike. <br /> • Long term settlement <br /> • Static dike stability <br /> • dewatering <br /> • Liquefaction and lateral spreading during a seismic event <br /> • Construction considerations <br /> MWH 3 9 Page 3 EVERETT PHASE 6-Supplemental Agreement No 2 <br /> 8/5/05 EXHIBIT A-2—SCOPE OF WORK <br />