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Bayley Construction | March 12, 2025 Page 2 <br />File No. 0661-144-00 <br />deposits exist under the northern half of the project site and possibly much of the site in general. The <br />advance outwash deposits consist of dense to very dense sand with varying gravel and silt content. The <br />depth to advance outwash ranges from 5 to 25 feet below ground surface. However, as part of the Pacific <br />Avenue Overcrossing project in 2005, several explorations were advanced within Pacific Avenue on the <br />south side of the project site that encountered medium stiff to stiff lacustrine clay underlying the fill. Where <br />encountered, the lacustrine clay generally ranges from 10 to 20 feet thick and is relatively weak and <br />compressible. <br />Based on our discussions with you and Shiels Obletz Johnsen, we understand that the proposed <br />explorations need to be performed within the public right-of-way prior to completion of private property entry <br />agreements. We propose to perform 9 borings within the right-of-way, as shown in the attached Figure 1, <br />Proposed Explorations. We understand that Bayley Construction will procure the necessary street use <br />permits required for drilling within the right-of-way at the proposed boring locations during the planned field <br />work (March 17 to 21, 2025). We recommend that two borings also be drilled on private property at a later <br />date as part of a second mobilization. <br />Prior to drilling the planned geotechnical explorations within the public right-of-way, we propose to <br />subcontract a vacuum excavation contractor to air knife the upper 5 feet of the 9 borings to clear the <br />locations. <br />GeoEngineers is also performing environmental services on the project, including the preparation of an <br />initial Phase I Environmental Site Assessment (Task 100). We recommend that environmental screening, <br />and focused sampling and chemical analyses be conducted during the geotechnical drilling as an initial <br />effort to plan for appropriate materials management and to begin to characterize project site soil and <br />groundwater for the presence of contamination as part of planning for project construction. <br />This proposal presents GeoEngineers’ proposed approach to the project, our scope of services, and our <br />fees and schedule. <br />Proposed Approach <br />The following paragraphs outline the key issues and GeoEngineers’ approach to the project. Key <br />geotechnical considerations for this site include the following: <br />■Evaluating the depth to bearing soils across the site and developing appropriate recommendations for <br />foundation support and earthwork. This will include preparation of a bearing soil elevation map that <br />can be used to estimate overexcavation depths. Foundations are anticipated to consist of shallow <br />spread foundations bearing directly on bearing soils or structural fill extending to bearing soils. <br />■Exploring the extent and competency of the lacustrine deposits on the south side of the site. We <br />propose to perform laboratory testing to characterize this material’s compressibility. <br />■Understanding the groundwater conditions at the site. The subsurface conditions (and whether <br />water- bearing soils are present overlying glacially consolidated soils) will be important to understand <br />the hydraulic conditions, site drainage, and constructability. <br />Design-Build Contract for Everett Outdoor Events Center <br />Exhibit C - Phase 1A Work and Fee Proposal