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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 <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. GR <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. presence or absence of obvious gasoline hydrocarbon odors <br />g. presence or absence of organic vapors detected by headspace analysis <br />A-1 <br />