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Environmental Assessment Report Advanced Environmental Concepts, Inc. 4.0 ASSESSMENT ACTIVITIES 4.1 Decontamination Procedures Prior to initiating drilling and hand augering operations,the augers and associated drilling equipment were thoroughly cleaned using a high pressure steam cleaner. In addition,the soil sampler and hand auger were washed in an Alconox solution and double rinsed in clean,deionized water prior to initial use and between each sampling interval to minimize the possibility of cross-contamination between ,., samples. r� 4.2 Soil Borings �q1 On January 9, 1997 eleven soil borings (B-1,2,3,...6-11) were drilled on the subject property. The borings were advanced using a truck-mounted Mobile B-61 drill rig, equipped with 8-inch O.D. �. continuous flight,hollow-stem augers.All soil borings were advanced to a total depth of 15-feet BGL. The borings were positioned to evaluate the vertical and horizontal extent of the hydrocarbon migration. Soil samples were collected at intervals of 5-feet in all borings commencing at 10-feet BGL. Samples were obtained by driving a thin-walled steel sampler,equipped with three 2-inch x 6-inch brass sleeves, a minimum of 184nches into previously undisturbed soil. The sampler was driven ahead of the augers using a 140-Ib.slide hammer with a 30-inch vertical fall. v Also, a hand auger was used to collect soil samples adjacent to the weed oil AST and also by the agricultural chemical storage shed. Following each sample drive, the sampler was withdrawn from the borehole and the three brass sleeves were removed. The bottom sleeve was retained for laboratory analysis and prepared by placing teflon tape and plastic caps over each and, then securing the caps with duct tape- The .+ samples were labeled,placed in sealable plastic bags,recorded on a Chain-of-Custody document and placed in an ice chest cooled with blue ice. Soil exposed at each end of the center brass sleeve, and the cuttings,were examined for lithological purposes and for any obvious evidence of hydrocarbons. Lithologic descriptions(Appendix B)were logged according to the Unified Soils Classification System (USCS). Chain-of-Custody protocol was strictly followed to ensure sample integrity and traceability. Upon completion of the above described procedures, the borings were abandoned with hydrated bentonite followed by a cement slurry to grade. L 4.3 Water samples A total of seven water samples were collected at the site. Six water samples were collected from within the augers at the conclusion of borings B-4,B-7,B-8,B-9, B-10 and B-11, using a stainless steel bailer and one water sample was collected from the drainage sump inside the former almond huller. The water samples were submitted to the laboratory and analyzed for TPH-d,TPH-g, and BTEX. 5.0 ANALYTICAL RESULTS Selected soil samples were submitted to Associated Laboratories, Inc., of Orange, California and analyzed for a combination of total petroleum hydrocarbons as gasoline (TPH-g),total petroleum hydrocarbons as diesel (TPH-d), benzene, toluene, ethylbenzene, and xylene (BTEX), organochlorine pesticides and PCB's, �+ Project: AEC 96C-1703 3 • ENVIRONMENTAL CONCEPTS WITH DESIGN IN MIND' �.r 4400 ASHE ROAD.#206 • BAKERSFIELD.CA 93313 8051831.1646 FAX 8051831-1771