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PARCADIS Mr. Jeffrey Wong Arcadis U.S., Inc. Environmental Health 100 Montgomery Street San Joaquin County Suite 300 1868 East Hazelton Avenue Sacramento Stockton, CA 95205 California 94104 www.arcadis.com Date: March 8, 2024 Our Ref: 30217717 Subject: Work Plan to Conduct a Limited Phase II Site Assessment at 16888 McKinley Avenue, Lathrop, California Dear Mr. Wong, Arcadis U.S., Inc. (Arcadis) has prepared this Work Plan to conduct a Limited Phase II Environmental Site Assessment(ESA)for the Super Store Industries (SSI) property located at 16888 McKinley Avenue in Lathrop, California (the Site; Figure 1). The proposed scope of work is related to real estate due diligence activities focused on determining the presence or absence of a release associated with several features located within the vicinity of a truck maintenance and truck wash building. The proposed work is not being performed for any regulatory agency, but rather for the two involved private parties. A copy of the access agreement agreed upon by these parties is included as Attachment A. The proposed areas of concern that will be investigated include: • Two underground storage tanks (USTs) containing diesel, and associated dispensers. • Two 550-gallon USTs likely containing new and used oil. • Two oil/water separator units connected to the truck maintenance building and truck wash building. These areas are depicted on the attached Figure 1. A larger site map is also included as Figure 2 which depicts the location of the truck maintenance and truck wash buildings in relation to the larger Site. Scope of Work The limited Phase II ESA will consist of the installation of 15 soil borings and 3 temporary soil vapor monitoring points for the purposes of collecting soil, groundwater, and soil vapor samples for laboratory analysis. Preliminary Activities Arcadis will perform the following activities prior to commencing drilling and sampling activities: • Obtain necessary Site access agreements, • Prepare a site-specific Health and Safety Plan, • Mark the Site and open a One Call (811)ticket as required by state law, • Conduct a private utility clearance survey to identify the locations of subsurface utilities and features, and • Obtain required drilling permit(s)from the San Joaquin County Health Department. 1/3