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21312 30th Dr. SE, STE. 110, Bothell, WA 98021 | 425.774.0106 | hwageo.com <br />June 13, 2024 <br />HWA Project No. 2024-P180-21 <br />Otak, Inc. <br />2828 Colby Avenue, Suite 401 <br />Everett, WA 98301 <br />Attention: David Ojala, PE <br />Subject: Revised Proposal for Geotechnical Engineering Services <br /> Everett Stormwater Conveyance Improvements <br /> Holly Drive and Dorn Avenue; Evergreen Way and West McGill Avenue <br /> Everett, Washington <br /> <br />Dear Mr. Ojala: <br />As requested, HWA GeoSciences Inc. (HWA) is pleased to present this revised proposal for <br />geotechnical services associated with the Everett Stormwater Conveyance Improvements <br />(Holly/Dorn and Evergreen/McGill) Project in Evertt, Washington. This scope of work is based <br />on our understanding of the project and our conversations with Otak. <br />PROJECT UNDERSTANDING <br />HWA understands the City of Everett (City) proposes to improve stormwater conveyance at two <br />sites within the city. The first site is in the vicinity of the intersection of Holly Drive and Dorn <br />Avenue, where the project will install approximately 195 linear feet (lf) of 42-inch diameter pipe, <br />1,800 lf of 36-inch diameter pipe, and 12 new/replaced structures. The second site is located in <br />the vicinity of Evergreen Way and McGill Avenue, where the project will install approximately <br />1,500 lf of 24-inch diameter pipe and 9 new structures. The design team is evaluating the <br />feasibility of using the jack and bore method of trenchless construction for the pipe crossing of <br />Evergreen Way. Excavations at both sites are anticipated to be up to 14 ft deep. Stormwater <br />treatment vaults may be constructed at up to two locations at each site. At Otak’s request, HWA <br />has prepared this proposal for geotechnical services in support of the proposed improvements. <br />SCOPE OF SERVICES <br />The following sections present HWA’s proposed scope of services to support design of the <br />project: <br />Project Management: HWA will provide general project management services, including <br />project startup/closure, progress reporting, budget-tracking, and internal coordination/scheduling.