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Site Assessment Work Plan Advanced Environmental Concepts, Inc. fill with water during the winter and spring. These features are identified as vernal pools and provide habitat for sensitive ecosystems. `r The property is located on gently sloping southwest grade with an average elevation of 50-feet above mean sea level. Surface sediments consist of unconsolidated, poorly bedded clays and silts with minor sand components. The majority of groundwater pumped from the area occurs within unconsolidated continental deposits. Regional groundwater flow direction (gradient) beneath the site area is generally toward the north and west. Depth to first unconfined groundwater ranges between 6 and 14 feet below grade level (BGL) beneath the site. The local gradient beneath the subject property is estimated to be toward the northeast. 4.0 WORK PLAN Advanced Environmental Concepts,Inc. proposes to advance a total of three soil borings within the former gasoline UST emplacement,to confirm the removal of hydrocarbon contamination. 4.1 Boring Locations and Depths AEC plans to advance three borings(W-1 through W-3)at the approximate locations plotted on Figure 2. The borings will be placed in a triangle to facilitate gradient calculation and will be placed in the area of the highest gasoline concentrations. W 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 V The boringswill 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 r 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. r.. Cuttings from the borings will be placed in appropriate 55-gallon containers or on sheets 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 rr Soil samples will be collected through the auger in 1.5-inch diameter by 6-inch long brass sleeves driven in a split spoon sampler by a 140-pound hammer with a 30-inch drop in accordance with ASTM v Project: AEC 96C-1917 3 • ENVFIONMAENTAL CONCEPTS WITH DESIGN IN MIND 4400 ASHE ROAD.*208 BAKERSFIELD.CA 93313 8051831-1646 • FAX 805/831-1771 r