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FIELD PROTOCOL Site Safety Plan Field work is performed by ERI personnel in accordance with a site safety plan (SSP) developed for the site The SSP describes the basic safety requirements for the subsurface investigation and the drilling of soil borings at the work site The SSP is applicable to personnel and subcontractors of ERI Personnel at the site are informed of the contents of the SSP before work begins A copy of the SSP is ' kept at the work site and is available for reference by appropriate parties during the work The ERI geologist acts as the Site Safety Officer Soil r n and Sampling Prior to drilling of borings and construction of wells, ERI acquires necessary permits from the appropriate agency(ies) ERI also contacts Underground Service Alert(USA) before drilling to help locate public utility lines at the site ERI observes the driller hand-probe and hand-auger boring locations to a depth of approximately 5 feet bgs and a diameter greater than the soil boring diameter before drilling to reduce the risk of damaging underground structures ' Soil borings are drilled with a B-81 (or similar) drill rig equipped with 8-inch diameter, hollow-stem augers Auger flights and sampling equipment are steam-cleaned before use to minimize the possibility of crosshole contamination The ansate is containerized and stored on site ERI will coordinate with Unocal for appropriate recycling or disposal of the rinsate Drilling is performed under the observation of a field geologist, and the earth materials in the borings 1 are identified using visual and manual methods, and classified as drilling progresses using the Unified Soil Classification System Soil borings are drilled to approximately 10 feet below the uppermost zone of saturation or 5 feet into any competent clay layer (aquitard) encountered beneath the water-bearing zone If an aquitard is encountered, the boning is terminated and backfilled with bentonite before installing a groundwater monitoring well During drilling, soil samples are collected at 5-foot intervals, obvious changes in ltthology, and dust above the groundwater surface Samples are collected with a California-modified, split-spoon sampler equipped with laboratory-cleaned brass sleeves Samples are collected by advancing the auger to a point just above the sampling depth and driving the sampler into the soil The sampler is driven 18 inches with a standard 140-pound hammer repeatedly dropped 30 inches The number of blows required to drive the sampler each successive 6-inch interval is counted and recorded to give an indication of soil consistency Soil samples are monitored with a photolonization detector (PID), which measures hydrocarbon concentrations in the ambient air or headspace above the soil sample Field instruments such as the PID are useful for indicating relative levels of hydrocarbon vapors, but do not detect concentrations of hydrocarbons with the same precision as laboratory analyses Soil samples selected for possible chemical analyses are sealed promptly with Teflon tape, and plastic caps The samples are labeled and placed in iced storage for transport to the laboratory Chain of Custody Records are initiated by the geologist in the field, updated throughout handling of the samples, and sent with the samples to the laboratory Copies of these records are in our report Cuttings generated during drilling are placed on plastic sheeting and covered and left at the site ERI coordinates with Unocal for the soil to either be treated on site or removed to an appropriate recycling or disposal facility