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1 . Pre-Tank Relining Site Assessment Report March 3 1997 The Southland Corporation 4627 Da Vinci Drive Stockton California 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 20632 located at 4627 Da Vinci Drive in Stockton California (Figure 1) The scope of work included sampling soil from six angled geoprobe borings beneath the three 10,000-gallon gasoline underground storage tanks (USTs) and four vertical borings located 25 to 45 feet from the USTs In addition, groundwater samples were collected from six of the borings (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 21 1997, in accordance with the scope of work outlined in Fluor Daniel GTI's Pre-Tank-Rehning 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 Heath and Safety Plan as required by the Occupational Safety and Health Administration (OSHA) Standard "Hazardous Waste Operations and Emergency Response" guidelines (29 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 21, 1997, Fluor Daniel GTI supervised the advancement of ten geoprobe points six angled borings (GP-1 through GP-6) beneath ends of the USTs and four vertical borings (GP-7 through GP-10) located near property boundaries and 25 to 45 feet from the corners of the UST pit (Figure 2) Soil samples beneath the USTs were collected at a maximum vertical depth of 15 feet below ground surface (BGS) and additional samples were collected from GP-3 and GP-5 at 5 feet BGS Ms Mary Meays of the SJCPHS was on site to observe a portion of the drilling activities Using a truck-mounted drill and direct push techniques one discrete soil sample was collected from each of the angled soil borings at a vertical depth of 15 BGS feet beneath the three 10 000-gallon USTs at the 0470ASMT RPT(Sth-W r� FLUOR DANIEL GTI