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N <br /> GETTLEI2-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 Health <br /> and Safety Plan and the Site Safety Plan. GR personnel and subcontractors who perform work <br /> at the site are briefed on the contents of these plans prior to initiating site work. The GR <br /> geologist or engineer at the site when the work is performed acts as the Site Safety Officer. OR <br /> utilizes a photoionization detector (PID) to monitor ambient conditions as part of the Health <br /> 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 the <br /> soil boring with a split-barrel sampling device fitted with 2-inch-diameter, clean brass tube or <br /> stainless steel liners. The sampling device is driven approximately 18 inches with a 140-pound <br /> hammer falling 30 inches. The number of blows required to advance the sampler each <br /> successive 6 inches is recorded on the boring log. The encountered soils are described using <br /> the Unified Soil Classification System (ASTM 2488 -84) and the Munsell Soil Color Chart. <br /> After removal from the sampling device, soil samples for chemical analysis are covered on both <br /> ends with teflon sheeting or aluminum foil, capped, labeled, and place in a cooler with blue ice <br /> for preservation. A chain-of-custody form is initiated in the field and accompanies the selected <br /> soil samples to the analytical laboratory. Samples are selected for chemical analysis based in <br /> 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, presenceor absence of obvious gasoline hydrocarbon odors <br /> g1 presence or absence of organic vapors detected by headspace analysis <br /> A-1 <br />