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AECOM May 3, 2019 San Joaquin County EHD 1868 East Hazelton Avenue Stockton, California 95205 Re: WORK PLAN RECEIVED Limited Phase II Environmental Site Assessment Warehouse Facility P'AY 1 3 2019 1624 Army Court Stockton, San Joaquin County, California ENVIRONMENTAL HEALTH DEPARTMENT Parcel#163-340-020-000 1.0 BACKGROUND AECOM conducted a Phase I Environmental Site Assessment of the property located at 1624 Army Court, Stockton, San Joaquin County, California in January 2019 and identified that 10,000-gallon diesel fuel, double-walled fiberglass, underground storage tank (UST) was installed at the Subject Property in 1987. Tank upgrades conducted in 2003 included the installation of new sump and fittings on the tank, new double wall fiberglass product piping and existing vent piping, install new under dispenser containment sump and new dispenser sump sensor, remove existing underground product piping, install new double wall fiberglass product piping for the diesel system, connect to the existing monitoring system, provide environmental sampling, and analysis report to the County, and perform piping, dispenser sump and containment testing. The Subject Property has been unoccupied since at least August 2018 and the UST has not actively been used since that time. Based on the age of the UST, AECOM recommended tank tightness testing to determine the likeliness of the UST to leak. A precision tank tightness test was conducted on this tank by a licensed testing company on February 14, 2019 and the tank passed the tightness test. Approximately 626 gallons of diesel fuel was measured in the tank during the precision tank tightness testing. 2.0 PURPOSE AND SCOPE OF WORK The below scope of work is being conducted as part of due diligence investigations. 2.1 Task 1 —Preparation of Health and Safety Plan As a standard part of work requiring field activities, especially those involving potentially hazardous materials, a site-specific Health & Safety Plan (HASP) will be developed and implemented. All work will be performed in Level D PPE. The California USA North (811) will be contacted at least three business days hours prior to initiation of fieldwork to identify potential underground utilities located in the vicinity of the proposed soil sampling locations.