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April 22, 1987 AGS 8691-6 <br /> Beacon Service Station #1-502 - Lodi, California <br /> soil. The sampler was driven 12 to 18 inches with a standard 140 <br /> pound hammer dropped 30 inches. The number of blows required to <br /> drive the sampler each successive six inches were counted and <br /> recorded as an indication of soil material consistency. <br /> Descriptions of earth materials encountered in the borings are <br /> presented in the Boring Log, Plates P-4 and P-5. Plate P-3 gives <br /> a summary of the Unified Soil Classification System used to <br /> identify the soils. Soil samples were subjectively analyzed for <br /> presence of hydrocarbon odor prior to preparation for transport <br /> to the laboratory. None of the samples from the borings showed <br /> subjective evidence of hydrocarbon contamination. The cuttings <br /> generated from the drilling operations were placed in the open <br /> tank cavity after it had been determined that they contained no <br /> detectable hydrocarbons. <br /> The samples collected for potential chemical analysis were <br /> removed from the sampler and immediately sealed in their brass <br /> sleeves with aluminum foil, plastic caps and air-tight tape. <br /> They were then labeled and placed in iced storage. A Chain-of- <br /> Custody form was initiated by the sampler and accompanied the <br /> samples to the analytical laboratory. A Copy of this form is <br /> included in the Appendix of this report. <br /> 4 <br /> .4,o,�/ieo' GeoSystems <br />