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ASPECT CONSULTING <br />ES-4 FINAL PROJECT NO. AS190583A-08  MAY 21, 2025 <br /> If the warehouse is demolished, excavation and landfilling of TPH-contaminated soils <br />and then capping of the building’s footprint. <br />In addition, the preferred Cleanup Alternative includes a contingent cleanup action for the <br />Snohomish PUD Substation area to be implemented at the time the PUD decommissions <br />the facility. <br />The preferred Cleanup Alternative protects human health and the environment and <br />complies with the MTCA threshold and additional criteria for selecting a cleanup action, <br />including consideration of public concerns, and potentially affected Indian Tribes, <br />vulnerable populations, and overburdened communities, and is considered permanent to <br />maximum extent practicable, in accordance with WAC 173-340-360. The preferred <br />Cleanup Alternative provides for monitoring to ensure that contaminants in groundwater <br />are not discharging to surface water at concentration that pose a risk to marine receptors <br />and provides for contingent remedial action if monitoring indicates that groundwater <br />discharge poses a risk to the East Waterway. <br />This Executive Summary should only be used in the context of the full report. <br /> <br /> <br /> <br /> <br />