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1.0 INTRODUCTION This report presents the results of post-cleanup groundwater compliance monitoring completed between July 2020 and July 2021 at the Former Smith Street Sawmill (Site), VCP NW3188. The Site is identified by the Washington State Department of Ecology (Ecology) as Cleanup Site ID 14477 and Facility Site ID 59663.The Site is located at 3600 Smith Avenue in Everett,Washington (Figures 1 and 2).The Property comprises eight Snohomish County Tax Parcel Numbers (00 5760-019-000-05, 00 5760 019 000-06, 00-5760-043-000-02, 00-5760-012-000-03,29 0529 003-008-00, 29 0529 002-012-00,29 0529-003- 030-00 and 29-0529-003-010-00) and is owned by the City of Everett(the City). The City is performing an independent cleanup of the Site under Model Toxics Control Act(MTCA), Chapter 70A.305 Revised Code of Washington (RCW) and Washington Administrative Code (WAC) 173-340. The Site was accepted into Ecology's Voluntary Cleanup Program (VCP) in October 2018. The groundwater compliance monitoring described in this report was performed after completion of soil remedial excavation to demonstrate groundwater compliance with MTCA and satisfy requirements for a Site no further action (NFA) determination. 2.0 PURPOSE AND SCOPE OF SERVICES The purpose of the 2020-2021 groundwater compliance monitoring was to demonstrate that the completed soil remedial excavation cleanup is protective of groundwater. Our services were completed in accordance with our Agreement with the City of Everett dated October 5, 2016 and associated Contract Amendments No. 2 and No. 3 dated February 6, 2019 and June 9, 2021 respectively. Our services consisted of the following: 1. Well Installation and Development: Installed two monitoring wells (MW-5 and MW-6) for groundwater compliance monitoring purposes as requested by Ecology. The wells were installed using hollow-stem auger drilling equipment owned and operated by Holocene Drilling, under subcontractto GeoEngineers. The wells were installed to total depths of 40 feet below ground surface(bgs)and constructed of 2-inch- diameter Schedule 40 polyvinyl chloride (PVC) with 10 feet of 0.010-inch slot PVC screen placed between 30 and 40 feet bgs. The monitoring wells were developed using purge and surge methods. 2. Groundwater Compliance Monitoring: Completed five post-cleanup groundwater monitoring events (July 2020, October 2020, January 2421, April 2021, July 2021). During each monitoring event, the following were completed: a. Measured the depth to groundwater in groundwater monitoring wells MW-1, MW-2, MW-3, MW-5, and MW-6 relative to the top of the PVC well casings and calculated groundwater elevations based on depth to groundwater measurements. b. Collected groundwater samples from monitoring wells MW-1, MW-2, MW-3, MW-5, and MW-6 for laboratory analysis using low-flow sampling techniques. c. Submitted groundwater samples to ALS Environmental of Everett, Washington for chemical analyses of gasoline-, diesel- and lube oil-range petroleum hydrocarbons by NWTPH-Gx and NWTPH-Dx Methods, volatile organic compounds (VOCs) by U.S. Environmental Protection GEOENGINEER� January24,2022 Pagel File No.0661-108-03