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GETTLER-RYAN INC. <br />FIELD METHODS AND PROCEDURES <br />Site Safejy 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 />