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Pre-Tank Relining Site Assessment Report 1 The Southland Corporation 4501 North Pershing Avenue Stockton California February 28, 1997 1.0 INTRODUCTION This report is submitted by Fluor Daniel GTI, Inc.to summarize the results of the soil and groundwater assessment conducted at Southland Store No. 17334, located at 4501 North Pershing Avenue in Stockton, California (Figure 1). The scope of work included sampling soil from four angled and three vertical geoprobe points beneath and adjacent to the three 10,000-gallon gasoline underground storage tanks (USTs) at the site. In addition,groundwater samples were collected from three of the:geoprobe points (Figure 2). The work scope was designed to fulfill the tank relining requirements of the San Joaquin County Public Health Services (SJCPHS). The work described in this report was completed at the site on February 20, 1997, in accordance with the scope of work outlined in Fluor Daniel GTI's Pre-Tank-Relining Soil Assessment Work Plan, dated February 3, 1997,which was accepted by the SJCPHS. , 2.0 ASSESSMENT WORK 2.1 Permitting/Site-Specific Health and Safety'Plan Fluor Daniel GTI conducted a technical review of all relevant information provided prior to proceeding with site assessment work. Permits for the soil borings were obtained from the SJCPHS. Following a complete review of site conditions, Fluor Daniel GTI prepared a site-specific Health and Safety Plan as required by the Occupational Safety and Health Administration (OSHA) Standard"Hazardous Waste Operations and Emergency Response"guidelines (2,9 CFR 1910.120).The document was reviewed and signed by all Fluor Daniel GTI personnel and subcontractors prior to commencement of work at the site. On February 7, 1997, Fluor Daniel GTI and a private utility locator met on site to locate underground utilities and clear the proposed soil boring locations. Underground Service Alert (USA) was called 48 hours prior to conducting drilling activities at the site. 2.2 Soil Sample Collection On February 20, 1997, Fluor Daniel GTI supervised the advancement of seven geoprobe points: four angled borings (GP1, GP2, GP5, and GP6) beneath the USTs,two vertical borings (GP3 and GP4) adjacent to the eastern and northern edge of the UST pit, and one vertical boring (GP7) located upgradient of the USTs and dispensers (Figure 2). The vertical borings adjacent to the UST pit were installed due to limited rig access which prevented the installation of angled borings. Soil samples beneath the USTs were collected at a vertical depth of 15 feet below ground surface (BGS), and samples were collected from the three vertical borings at depths of 17 or 22 feet BGS. Mr.Harlin Knoll of the SJCPHS was on site to observe a portion of the drilling activities. • i 0472ASMT RPT(Sthl-56) FLUOR DANIEL GTI I I