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t' <br /> N <br /> a <br /> GETTLER—RYAN INC . <br /> FIELD METHODS AND PROCEDURES <br /> Site Safety Plan <br /> Field work performed by Gettler-Ryan Inc. (GR) is conducted in accordance with GR' s <br /> Health and Safety Plan (revised January 16 , 1995) and the Site Safety Plan. GR personnel <br /> and subcontractors who perform work at the site are briefed on the contents of these plans <br /> prior to initiating site work. The GR geologist or engineer at the site when the work is <br /> performed acts as the Site Safety Officer. GR utilizes a photoionization detector (PID) to <br /> monitor ambient conditions as part of the Health and Safety Plan. <br /> Collection of Soil Samples <br /> Soil borings are drilled by a California-licensed well driller . A GR geologist is present to <br /> 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 Soil <br /> 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 on: <br /> a , depth relative to underground storage tanks and existing ground surface <br /> b , depth relative to known or suspected groundwater <br /> C , presence or absence of contaminant migration pathways <br /> d , presence or absence of discoloration or staining <br /> e , presence or absence of obvious gasoline hydrocarbon odors <br /> f, presence or absence of organic vapors detected by headspace analysis <br /> A-1 <br />