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GEOSTRATEGIE,S <br /> FIELD METHODS AND PROCEDURES <br /> Site Safety Plan <br /> Field work performed by GeoStrategies (GSI) is conducted in accordance with GSI's Health <br /> and Safety Plan and the Site Safety Plan GSI personnel and subcontractors who perform <br /> work at the site are briefed on the contents of these plans prior to initiating site work The <br /> GSI geologist or engineer at the site when the work is performed acts as the Site Safety <br /> Officer GSI utilizes a photoionization detector (PID) to monitor ambient conditions as part <br /> of the Health and Safety Plan <br /> Collection of Soil Samples <br /> Soil borings are drilled by a California-licensed well driller A GSI 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 encountered earth material Soil samples are collected <br /> . from the soil boring with a split-barrel sampling device fitted with 2-inch-diameter, clean <br /> brass tube or stainless steel liners The augers are drilled to the desired sampling depth, and <br /> the sampling device is then driven approximately 18 inches ahead of the augers with a <br /> 140-pound hammer falling approximately 30 inches The number of blows required to <br /> advance the sampler each successive 6 inches is recorded on the boring log The encountered <br /> soil is 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 <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 observed contaminant migration pathways <br /> d presence or absence of observed discoloration or staining <br /> e presence or absence of obvious gasoline hydrocarbon odors <br /> f presence or absence of organic vapors detected by headspace screening <br /> • <br /> A-1 <br /> GeoStrategies Inc. <br />