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a� w Site Assessment Work Plan Advanced Environmental Concepts, Inc. 60 former UST emplacement located near the southeast corner of the shop building. Borings B-2 and B-3 will be •stepped out'around boring B-1 as determined by PID screening and field observations. The boring identified as B-4 will be drilled through the estimated I~ center of former UST emplacement located south of the Quonset Hut building. Borings B•5 and B-6 will be 'stepped out' around boring B-4 as determined by PID screening and field observations. Each boring will be advanced to a minimum depth of 20-feet BGL. Borings which encounter both petroleum hydrocarbons and groundwater will be completed as groundwater monitoring wells and advanced 10-feet beyond the air-water interface. r.. 5.0 METHODS The methods to be employed during implementation of the above scope of work are described in the following sections. 5.1 Boring Methods The borings will be advanced using a Mobile B-61 Drill Rig, with an 8-inch diameter, continuous flight auger in accordance with ASTM Method D 1452-80 for soil investigations and sampling by auger borings. At no time shall any water or other liquid be added to the boring. The augers will be steam cleaned prior to drilling the borings. The lithology and other pertinent data will be recorded on a field boring log in accordance with the Unified Soil Classification System for visual description and identification of soils. Cuttings from the borings will be placed in appropriate 55-gallon containers or on sheets 6+ of plastic and covered until verified by analytical results, whether or not the soil is contaminated. If the material is contaminated, a written plan will be submitted by the facility operator to the County for approval prior to treatment and/or disposal. Disposal will be the responsibility of the facility operator and occur within 90-days of completion of drilling. 5.2 Soil Sampling Soil samples will be collected through the auger in 1.5-inch diameter by 6-inch long brass w sleeves driven in a split spoon sampler by a 140-pound hammer with a 30-inch drop in accordance with ASTM Methods D 1586-84 for split-barrel sampling of soil and D 1587-83 for thin-walled tube sampling of soils. The brass sleeves and sampler will be washed in 4, an Alconox solution and double rinsed in clean de-ionized water prior to each use. Soil samples will be driven at five foot intervals in the boring beginning at 5 feet BGL. The blow counts, recovery, and Iithology will be recorded on the field logs. Uthology will be described in accordance with ASTM Method D 2488-84 (Standard Practice for Description and Identification of Soils). Selected soil samples will be sealed with teflon tape, capped, sealed with duct tape, and labeled in accordance with EPA protocols. The samples will Ind Project: AEC 96C-1707 4 • ENVIRONMENTAL CONCEPTS WITH DESIGN IN MIND Y.r 4400 ASHE ROAD.#206 • BAKERSFIELD.CA 93313 8051831-1646 • FAX 805/831-1771