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1 1 Water samples were placed in containers provided by the laboratory Water samples were labelled with a unique sample number, the project name and location, the date and time, and the sampler's initials Samples were then placed in Zip-Lock® type plastic bags, sealed, and placed in an iced cooler. Information noted on the label was recorded on a chain-of- deliveredorm After under chain offmcustody to letion of drilling, the samples were Sequoia Analytical, a California-certified laboratory. ' Geophysical SurMey. On December 4, 1992, a geophysical survey of Tank Site #2 was performed by Spectrum Environmental Geophysics. The survey was performed using both a magnetometer and ground ' penetrating radar to locate the potential presence of buried objects and/or debris at the site. The survey investigated a 150-foot by 150-foot area which covered the entire site investigation area north of the warehouse building (including all boring locations except MW-4A ' inside the warehouse) and extended to the edge of the Stockton Deep Water Channel The d ob objects or debris over the entire survey areults of the investigation found no aaies characteristic of burie ' ' S=Wc Selectedsamples soil les and ground water samples were analyzed for P the following constituents • Total Petroleum Hydrocarbons (TPH) as Gasoline and Diesel, ' 0 Total Lead; • Organic Lead; and ' 0 Ethylenedibromide (EDB). For QA/QC purposes during the ground water sampling, field blanks ' and trip blanks were collected water samples prior to The laboratory did not filterany of he ground ' analysis. Phase II Investigation The Phase II Investigation conducted on April 8, 1993 included the installation of one additional ground water monitoring well (MW-5A) ' and four soil borings. This section describes the preparatory work performed prior to initiating ' initiata get d activities, well construction and drilling � d the soil and d water sampling procedures 5-8