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Z2 Soil Sampling <br /> Samples were collected utilizing a split spoon sampler advanced using a hydraulic hammer <br /> The sampler contained brass tubes for collection of undisturbed samples The sampler and <br /> brass tubes were decontaminated by scrubbing with a non-phosphate detergent, triple rinsing <br /> with tap water, rinsing with methanol followed by a distilled water rinse Soil samples were <br /> collected every 6 inches withm the lower foot of each borehole, to the maximum attainable <br /> depth All vadose zone samples collected were submitted for laboratory analysis in order to <br /> provide a vertical hydrocarbon distnbution profile. <br /> Each soil sample was promptly sealed with aluminum foil, plastic end caps and tape The <br /> samples were then placed in a "ziplock" bag, sealed with security tape and delivered to a <br /> DOHS certified laboratory for analysis. Chain-of-Custody records will be maintained for all <br /> samples. <br />' 2.3 Soil Sample Analysis <br /> All soil samples were analyzed for total petroleum hydrocarbons (TPH) as diesel and benzene, <br /> toluene, ethyl benzene, and xylenes (BTEX) by EPA methods 8015 and 8020 respectively <br /> yThe sample containing the greatest diesel concentration and/or the deepest sample per <br /> borehole was additionally analyzed by the Soluble Threshold Limit Concentrations (STLC) <br />' for TPH (EPA 8015). <br /> One select soil sample only was analyzed by Zalco Laboratories, Inc. (under subcontract to <br /> McCampbell) for total organic matter using method 24/USDA Handbook #60 One <br /> representative sample was additionally tested for grain size distribution by sieve analysis, by <br /> the Solea Testing Group of Concord, California A soil cutting composite sample was <br /> analyzed by McCampbell Analytical for reactivity, corrosivity and ignitability (Title 22) to <br /> facilitate waste disposal. <br /> Upon arrival to the laboratory, the samples' condition was checked and any nonconformaties <br /> were noted Copies of the Chain of Custody records and signed laboratory reports are <br /> presented in Appendices A and B respectively <br /> MZ/09-06-941UST/94-0I38 mer 5 <br />