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• <br /> GEOSTRATEGIES <br /> FIELD METHODS AND PROCEDURES <br /> Site Safety Plan <br /> Field work performed by GeoStrategies (GSI)is conducted in accordance with GSI's Health <br /> and Safety Plan and the Site Safety Plan. GSI personnel and subcontractors who perform <br /> work at the site are briefed on the contents of these plans prior to initiating site work The <br /> GSI geologist or engineer at the site when the work is performed acts as the Site Safety <br /> Officer. GSI utilizes a photoionization detector (PID) to monitor ambient conditions as part <br /> of the Health and Safety Plan <br /> Collection of Soil Samples <br /> Soil bonngs are drilled by a California-licensed well driller A GSI geologist is present <br /> to observe the drilling, collect soil samples for description, physical testing, and chemical <br /> analysis, and prepare a log of the exploratory soil boring. Soil samples are collected from <br /> the soil boring with a split-barrel sampling device fitted with 2-inch-diameter, clean brass <br /> tube or stainless steel liners The sampling device is driven approximately 18 inches with <br /> a 140-pound hammer falling 30 inches. The number of blows required to advance the <br /> sampler each successive 6 inches is recorded on the boring log. The encountered soils are <br /> described using the Unified Soil Classification System (ASTM 2488-84) and the Munsell <br /> Soil Color Chart <br /> After removal from the sampling device, soil samples for chemical analysis are covered on <br /> both ends with teflon sheeting or aluminum foil, capped, labeled, and place in a cooler with <br /> blue ice for preservation A chain-of-custody form is initiated in the field and accompanies <br /> the selected soil samples to the analytical laboratory. Samples are selected for chemical <br /> analysis based in part on. <br /> a depth relative to underground storage tanks and existing ground surface <br /> b. depth relative to known or suspected groundwater <br /> c depth relative to areas of known hydrocarbon impact at the site <br /> d presence or absence of contaminant migration pathways <br /> e presence or absence of discoloration or staining <br /> f. presence or absence of obvious gasoline hydrocarbon odors <br /> g presence or absence of organic vapors detected by headspace analysis <br /> A-1 <br />