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Dividend Development Corporation Workplan to Determine Extent of Soil Contamination May Z3, 1991 Page 4 SAMPLE PROCEDURES: i Toxic Technology, Inc. proposes that the five foot (51 ) continuous core method be employed to collect samples. ' This method retrieves a five foot (51.) soil sections. From this core, a sample would be extruded and immediately placed in a glass jar with a teflon' - lined lid. This procedure provides a' much more comprehensive look at the lithology than the standard split-spoon techniques. There is a risk of losing a small 1fraction of volatiles, however the extra date provided by obtaining a complete five foot (5 ' ) core is, in TTI 's opinion, of greater significance. This sampling procedure has been utilized for site investigations by TTI -in various counties and cities throughout California. If sampling from the five foot (51 ) core sections is not approved, TTI will collect samples via an eighteen-inch (1811) split spoon sampler with six-inch (611) brass liners. The liners would be sealed with foil and covered with tight fitting plastic caps. The j sample is then sealed by taping the plastic cap, by placing the brass tube in a plastic ziplock bag, or both. Which ever method is II utilized, samples will be collected at a minimum of five foot (5 ' ) intervals. All sample equipment will be decontaminated between , sampling instances by steam cleaning the equipment or by washing the equipment with the three bucket technique, which is five (5) gallons of water mixed with a trisodium phosphate soap (TSP) , then rinsing the equipment in a second bucket, and then again rinsing the equipment in a distilled water rinse. The equipment is then dried and staged in a clean area for the next sampling event. i Toxic Technology, Inc.