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ARCADIS <br /> Mr. Rob Saur <br /> September 3, 2008 <br /> Pre-Field Activities <br /> f � <br /> Prior to initiating field activities, a utility survey will be conducted to identify and mark <br /> out underground utilities and other potential subsurface obstructions in the vicinity of <br />,I <br /> the proposed boring locations. The utility survey will include identifying the site using <br /> white paint and obtaining an Underground Service Alert (USA-North)ticket for the <br /> site by calling USA-North at least 48 hours prior to drilling and excavation activities. <br /> Additionally;a private third-party utility-locator will screen all proposed boring <br /> locations to locate nearby underground utilities. A well permit from San Joaquin <br /> County will be obtained prior to the initiation of fieldwork. <br /> Soil Boring Installation <br /> Six soil borings will be advanced to a total depth of 6 feet below ground surface(bgs) <br /> using a 2-inch diameter hand auger. Soil boring locations are shown on Figure 1. Soil <br /> samples will be continuously logged from surface to the total depth of the boring. Soil <br /> samples will be field screened for the presence of volatile organic vapors using a <br /> photoionization detector(PID) and examined for visual indications of the presence of <br /> petroleum hydrocarbons. Soil samples will be logged for lithologic properties <br /> (including soil type, color, moisture content, etc.) using the Unified Soil Classification <br /> System (USCS). Hand augers and sampling equipment will be decontaminated with l <br /> a non-phosphate detergent(such as Alconox) and distilled water rinse prior to and <br /> between each boring to prevent cross-contamination. <br /> Soil Sampling and Analysis <br /> T <br /> Soil samples will be collected just below the ground surface, 3.0 feet bgs, and at 6.0 <br /> feet bgs from.each boring and.retained for.analytical testing..The soil-samples will be <br /> sealed, labeled, and placed in an ice-chilled cooler. A total of eighteen soil samples <br /> will be collected and retained for quantitative chemical analysis. Following collection, <br /> the samples will be transported by a lab courier to Calscience Environmental <br /> Laboratories (Calscience), a California-certified analytical laboratory, under proper <br /> chain-of-custody procedures., <br /> The nine soil samples collected from soil borings immediately adjacent to the <br /> `-tr na sformer vault (SB-1}t'hrougE�SB=3)-wiiI-be-analyzeVor Total petroleum <br /> hydrocarbons (TPH)'as mineral oil by USEPA Method 8015B (M)With'silica gel <br /> ..cleanup. The remaining nine soil samples will be put on hold and run if initial soil <br /> sampling results indicate that further characterization is necessary. <br /> Page: <br /> 213 <br />