902 N BROADWAY BASE FILE 2025-03-27

Page 15 ■ Coordinate access to the subject Property for EES field staff and subcontractors, including access and permission from the Property owner and building tenants for exterior and interior drilling, sampling, and installation of two groundwater monitoring wells (eastern parking lot area) and five re-usable sub-slab Vapor Pins at the following indoor locations: ❑ Broadway Deli Mart ❑ Refined Coffee ❑ Botan Ramen N Teriyaki Restaurant ❑ Umami Restaurant ■ Obtain necessary authorization/access from the City of Everett to install reusable utility trench vapor wells (SGW-6 through SGW-8) in the sanitary sewer trench backfill alignment along the eastern Property boundary. ■ Obtain necessary access and traffic control permits, if possible,from the City of Everett to install two HRSC temporary borings in the Tower Street right-of-way(ROW), immediately to the north of the Property, and three HRSC borings in the North Broadway Avenue ROW to the east of the Property.These proposed roadway borings are necessary to avoid a network of underground utilities located in sidewalk areas. ■ Request public and private utility locates to identify and avoid underground utilities during drilling. TASK 5113: PROJECT MANAGEMENT AND COMMUNICATIONS EES will provide technical analysis, project management, reporting, and communications tasks as necessary to implement and document the specified work scope activities. EES will provide regular communications with NAP and Ecology regarding project status, and we will prepare and submit written progress reports to document key sampling/analytical milestones. Following completion of the 2024 work tasks as specified, EES and NAP will coordinate with Ecology to evaluate overall progress and approach to cleanup implementation as necessary to achieve regulatory compliance and closure. SCHEDULE EES will install Task 1 sub-slab Vapor Pins (SSV-1 through SSV-5) as soon as possible after receiving notice to proceed from NAP, access from the current Property owner and tenant access, and acknowledgment/input regarding work plan activities from Ecology. Sub-slab soil sampling will likely also be conducted at this time. Sub-slab Vapor Pins will be installed, and initial sampling will be conducted with the SVE system running "Ste 1" . Vapor samples will also be collected from existing soil gas wells SGW-1 through SGW-5 at this time, with the SVE system in operation. Following completion of the initial 7-day WMS sampling period, EES will then disable the SVE system prior to demobilizing from the Site. The HRSC investigation (Task 2B), installation of the utility trench vapor wells (SGW-6 through SGW-8) (Task 1B), and two additional groundwater monitoring wells (MW-11 and PMW-1) (Task 3A) will occur shortly thereafter.The sanitary sewer cleanout vapor samples will be collected in conjunction with samples from the utility trench vapor wells (Task 1C).A single groundwater monitoring event will also be EES ENVIRONMENTAL CONSULTING,INC. 2120-02 2024 SOW 20240408f