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i GETTLER-RYAN INC. FIELD METHODS AND PROCEDURES WELL INSTALLATION Site Safety Pian Field work performed by Gettler-Ryan Inc (GR) is conducted in accordance with GR's Health and Safety Plan and the Site Safety Plan GR personnel and subcontractors who perform work at the site are beefed on the contents of these plans prior to initiating site work The GR geologist or engineer at the site when the work is performed acts as the Site Safety Officer GR utilizes a photoionization detector (PID) to monitor ambient conditions as part of the Health and Safety Plan Collection of Soil Samples Collection, preservation, and analysis of samples is performed in accordance with the California Code of Regulations Title 23, Division 3, Chapter 16, Underground Tank Regulations (June 2001), the Central Valley Regional Water Quality Control Board's Tri-Regional Board Staff Recommendations for Preliminary Investigation And Evaluation Of Underground Tank Sites (August 1990), Environmental Protection Agency SW-846 Methods(November 2000), and local agency guidelines Well borings are drilled by a California-licensed well driller A GR geologist is present to observe the drilling, collect soil samples for description, physical testing, and chemical analysis, and prepare a log of the exploratory soil boring under the supervision of a California Registered Geologist Soil samples are collected from the soil boring with a split-barrel sampling device fitted with 2-inch-diameter, clean brass tubes or stainless steel liners The sampling device is driven approximately 18 inches with a 140-pound hammer falling 30 inches The number of blows required to advance the sampler each successive 6 inches is recorded on the boring log The encountered soils are described using the Unified Soil Classification System (ASTM 2488-93) and the Munsell Soil Color Chart or GSA Rock Color Chart After removal from the sampling device, soil samples for chemical analysis are covered on both ends with teflon sheeting, capped, labeled, and placed in a cooler with blue ice for preservation to 4°C±2°C A chain-of-custody form is initiated in the field and accompanies the selected soil samples to a California state-certified hazardous material testing laboratory Samples are selected for chemical analysis based in part on a depth relative to underground storage tanks and existing ground surface b depth relative to known or suspected groundwater c depth relative to areas of known hydrocarbon impact at the site d presence or absence of contaminant migration pathways e presence or absence of discoloration or staining f presence or absence of obvious gasoline hydrocarbon odors g presence or absence of organic vapors detected by headspace analysis Field Screening of Soil Samples A PID is used to perform headspace analysis in the field for the presence of organic vapors from the soil sample This test procedure involves removing some soil from one of the sample tubes not retained for chemical analysis and immediately covering the end of the tube with a plastic cap, or by placing a small amount of the soil to be screened in a sealable plastic bag The soil is warmed in the sun to allow organic compounds in the sample to volatilize The PID probe is inserted into the headspace inside the tube