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IBank of Stockton Page 4 Site Characterization-Work Plan Former Union Facility,-Cutter Lumber 3422&3440 S EI Dorado,Stockton Project No 102 2 October 7,1996 which will propose the installation of groundwater monitoring wells and the destruction of the domestic water well 4.1 Soil Boring Installation ' Phase One Environmental Inc proposes to install a total of 8 soil borings to a depth of about 35 feet, or a depth sufficient to penetrate the capillary fringe zone As shown on ' the Site Sketch Map, the borings will be located in the approximate locations in the vicinity of the former underground gasoline tank and the dispenser island, the domestic water well, and to explore the extent of impacted soil in the suspected down-gradient ' direction of groundwater flow The soil borings will be drilled using 8 inch outside diameter hollow stem auger equipment Soil cuttings will be containerized in DOT approved 55 gallon drums, labeled, and stored on site until their proper disposition can be arranged Soil samples will be collected for geological and analytical evaluation at five foot intervals Soil samples will be collected using a 2 0 inch diameter (i d ) California split spoon sampler with sample contained in two by six inch brass liners All soil samples will be sealed with aluminum foil, capped, labeled and placed in a cooler at 4° Celsius for transport to the laboratory following Chain of Custody protocol Not all soil samples collected are likely to be submitted for laboratory analysis Accordingly, a field screening procedure will be used to select those samples which will be tested Field observation methods (i a sediment type, color, texture, moisture and ' visible evidence of contamination such as staining and odor) will be used to held identify potentially contaminated soil An PID meter using a 10 0 eV lamp may also be used to detect the presence of organic vapors above background levels The soil borings will be closed as follows after the last soil sample has been collected, 25 pounds of granular bentonite will placed at the bottom of each boring and hydrated with clean tap water Neat cement will be used to close the remainder of each boring 3.2 Soil Sampling and Analyses All soil samples will be screened using field methods by observing discoloration and, odor Samples will be collected at 5 foot intervals and preserved for possible analysis At least two soil samples from each bonng, will be submitted to Sherwood Laboratories of Hilmar (State Certified Laboratory #1400) for benzene, toluene, ethylbenzene and xylene (BTEX by method EPA 8020), and gasoline and diesel range petroleum hydrocarbons analyses (TPH-G & D) The detection limits for the BTEX analysis is 3 0 2937 Veneman Ave,#$240 Phase One Environmental Inc Phone(209)569-0293 Modesto,CA 95356 Fax (209)569-0295