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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 Health and <br /> Safety Plan and the Site Safety Plan. GR personnel and subcontractors who perform work at the site <br /> are briefed on the contents of these plans prior to initiating site work. The GR geologist or engineer <br /> at the site when the work is performed acts as the Site Safety Officer. GR utilizes a photoionization <br /> detector (PID) to 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 observe the <br /> drilling, collect soil samples for description, physical testing, and chemical analysis, and prepare a log <br /> of the exploratory soil boring. Soil samples are collected from the soil boring with a split-barrel <br /> sampling device fitted with 2-inch-diameter, clean brass tube or stainless steel liners. The sampling <br /> device is driven approximately 18 inches with a 140-pound hammer falling 30 inches. The number <br /> of blows required to advance the sampler each successive 6 inches is recorded on the boring log. The <br /> encountered soils are described using the Unified Soil Classification System (ASTM 2488-84) and the <br /> Munsell Soil Color Chart. <br /> After removal from the sampling device, soil samples for chemical analysis are covered on both ends <br /> with teflon sheeting or aluminum foil, capped, labeled, and place in a cooler with blue ice for <br /> preservation. A chain-of-custody form is initiated in the field and accompanies the selected soil <br /> samples to the analytical laboratory. Samples are selected for chemical 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 /> Field Screening of Soil Samples <br /> A PID is used to perform head-space analysis in the field for the presence of organic vapors from the <br /> soil sample. This test procedure involves removing some soil from one of the sample tubes not <br /> retained for chemical analysis and immediately covering the end of the tube with a plastic cap. The <br /> PID probe is inserted into the headspace inside the tube through a hole in the plastic cap. Head-space <br /> screening results are recorded on the boring log. Head-space screening procedures are performed and <br /> A-1 <br />