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. GETTLER-RYAN INC FIELD METHODS AND PROCEDURES Site Safety Plan 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 briefed on the of these plans contents 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 photolomzation detector (PID) to monitor ambient conditions as part of the Health and Safety Plan Collection of Soil_Samples Exploratory soil 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 Soil samples are collected from the exploratory soil boring with a split-barrel sampler or other appropriate sampling device fitted with clean brass or stainless steel liners The sampling device is driven approximately 18 mches with a 140-pound hammer falling 30 inches The number of blows required to advance the sampler each successive 5 inches is recorded on the boring log The encountered soil is described using the Unified Soil Classification System (ASTM 2488-84) and the Munsell Soil Color Chart After removal from the sampling device, soil samples for chemical analysis are covered on both ends with teflon sheeting or aluminum foil, capped, labeled, and placed in a cooler with blue ice for preservation A chain-of-custody form is initiated in the field and accompanies the selected soil samples to the analytical laboratory Samples are selected for chemical analysis based on a depth relative to underground storage tanks and existing ground surface b depth relative to known or suspected groundwater c presence or absence of contaminant migration pathways d presence or absence of discoloration or staining e presence or absence of obvious gasoline hydrocarbon odors f presence or absence of organic vapors detected by headspace analysis Field Screenina of Soil Samples I A PID is used to perform head-space analysis in the field for the presence of organic vapors from the soil sample j 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 The PID probe is inserted into the headspace inside the tube through a hole in the plastic cap Head-space screening results are recorded on the boring log Head-space screening procedures are performed and results recorded as reconnaissance data GR does not consider field screening techniques to be verification of the presence or absence of hydrocarbons Stockpile Sampling Stockpile samples consist of four individual sample liners collected from each 100 cubic yards (yd') of stockpiled soil material Four arbitrary points on the stockpiled material are chosen, and discrete soil sample is collected at each of these points Each discrete stockpile sample is collected by removing the upper 3 to 6 inches of soil, and then driving • the stainless steel or brass tube into the stockpiled material with a wooden mallet or hand driven soil sampling device The sample tubes are then covered on both ends with teflon sheeting or aluminum foil, capped, labeled, placed in the I