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SITE SAMPLING AND LABORATORY ANALYSIS <br /> On 30 September and 2 October 1986, AEMC collected twelve soil <br /> samples from beneath the eight tanks. Sample locations and <br /> identification numbers are shown on Attachment 1 . <br /> Samples were collected in native soil, approximately two feet <br /> below the bottom of the excavation using a backhoe. The backhoe <br /> bucket was filled with soil from the proper sampling location. <br /> A location in the bucket was randomly selected and the outer six <br /> inches of soil were removed using a hand trowel. An aluminum or <br /> brass tube was then inserted into the soil at this location, <br /> filling the tube. <br /> The tubes were immediately sealed, labeled, and placed on ice. <br /> All samples were maintained under chain of custody and delivered <br /> to the laboratory within twenty—four hours . <br /> All sample analyses were performed by Eureka Laboratories, Inc., <br /> State Certification No. 108. Samples were analyzed for Total <br /> Hydrocarbons (EPA Method 8015 modified) and Volatile Aromatic <br /> Hydrocarbons (EPA Method 8020). In addition to State require— <br /> ments, at least ten percent duplicate and spike samples were <br /> analyzed with each sample set for quality assurance/quality <br /> control <br /> 4 <br />