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k • Additional Site Assessment Report and Work Plan for Additional Subsurface Investigation 2 The Southland Corporation,Store#19976,1399 N Main St,Manteca,California June 5,1998 ' using the same protocol and analyzed for the some parameters as the samples collected beneath the USTs ' 3.0 ASSESSMENT WORK 3.1 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 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(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 ' 3.2 Soil Sample Collection On April 29, 1998, Fluor Daniel GTI supervised the advancement of three geoprobe points(GP-1 through ' GP-3) near the underground storage tank(UST) pad and pump island (Figure 2) Using a truck-mounted hydraulic drill and direct push techniques,discrete soil samples were collected from each of the soil bonngs Soil samples were collected at 5-foot intervals beginning at 5 feet below grade Each core was collected in a 2-foot-long by 1.25-inch-outside-diameter stainless steel sampling barrel lined with 1-inch-diameter by 2-foot4ong acetate tube insert Geoprobe point,GP-2 was cored continuously to ' 25 feet below ground surface(BGS)and then discrete sampled at 5-foot intervals to 45 feet BGS After being driven to the required sampling depth,the lead drive point of the core sampler was released and the sample barrel was pushed an additional two feet to collect the soil sample Following sample collection, ' the sampling barrel and drive rods were removed from the probe hole and the soil samples were removed from the sampling sleeves and used for soil descriptions One sample sleeve from each sample location was retained for laboratory analysis The drive rods and tools were triple rinsed with Alconox detergent and ' distilled water between bore holes,and all sampling equipment was cleaned between each sampling interval to reduce the potential for cross-contamination ' The soil from the cores was screened for hydrocarbon vapors using a flame ionization detector(FID) Soil was logged using the Unified Sod Classification System by a Fluor Daniel GTI field geologist working under the supervision of a California registered geologist(Appendix A) One 6-inch-long sleeve was collected from the 2-foot-long sample tube at each sampling interval,sealed with tape, labeled and placed on ice in an insulated container for transport under chain-of-custody manifest to Core Analytical Labs In Anaheim, ' California for analysis Field notes are included as Appendix B A total of 19 soil samples were submitted for laboratory analysis for benzene,toluene,ethylbenzene and total xylenes(BTEX), methyl-tert-butyl-ether(MTBE), and total petroleum hydrocarbons-as-gasoline 1"76„r q* ' s FLUOR DANIEL CTI