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June 13, 2024 <br />HWA Project No. 2024-P180-21 <br />Proposal for Geotechnical Engineering Services <br />Everett Stormwater Conveyance Improvements 5 HWA GeoSciences Inc. <br />• Boring locations will be determined using handheld GPS and/or measurement from <br />existing known features. <br />• The project sites are assumed to be free of contamination. <br />• The geotechnical explorations proposed herein will not be used to assess site <br />environmental conditions. However, visual or olfactory observations regarding potential <br />contamination will be noted. Analysis, testing, storage, and handling of potentially <br />contaminated soil and ground water (either samples or spoils from drilling) are beyond <br />this scope of services. If contaminated soils and/or ground water are encountered, the <br />material will be properly contained on-site for disposal as mutually agreed upon without <br />additional cost to HWA. <br />• Experience has shown that subsurface soil and groundwater conditions can vary <br />significantly over small distances, and it is possible that other subsurface conditions <br />and/or contamination may exist in areas that were not investigated. If contamination is <br />discovered, it is likely that the data will not be sufficient for delineating the vertical <br />and/or lateral extent of contamination or to provide an accurate cost estimate for soil <br />and/or groundwater disposal during construction. <br />• All required rights-of-way and/or rights-of-entry permits will be provided by others at no <br />cost to HWA. <br />• Utility locates, completed via the Washington Utility Locate Center, will be <br />comprehensive and accurate enough to allow for reliable and safe location of borings. <br />Vacuum extraction of borings is not included. <br />• The City of Everett will allow the pavement at the boring locations to be patched with <br />fast-setting concrete. <br />• Portland cement concrete pavement is not present below the asphalt concrete pavement at <br />proposed exploratory boring locations (i.e., no concrete coring will be required), with the <br />exception of the boring near the intersection of Evergreen Way and West McGill Avenue. <br />One concrete core will be conducted at that location. <br />• Proposed stormwater treatment vaults will be located within the proposed storm sewer <br />alignments. <br />• Maximum trench depths will be 14 feet or less. <br />• Borings not completed as groundwater monitoring wells will be decommissioned in <br />accordance with the requirements of WAC 173-160. <br />• Excess cuttings from the exploratory borings will be properly disposed of off-site.