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09:'12:'97 16:49 GR/GSI-SACTO - 12094640130 Ura <br /> GEOSTRATEGIES <br /> FIELD METHODS AND MOCEDURkS <br /> Site Safety P►an <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 f Soil Samples <br /> Soil borings 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 /> b ends with teflon sheeting or aluminum foil, capped, labeled, and place in a cooler with <br /> lue ice or reservad n 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 pan 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 /> C. 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 />