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31 March 2004 <br /> AGE-NC Project No 03-1077 <br /> Page 4 of 7 <br /> Prior to sample collection, soil and groundwater sampling equipment was thoroughly rinsed with clean <br /> water after washing with a solution of Alconox Sampling rods were thoroughly cleaned prior to soil <br /> probe boring advancement <br />' All nnseate generated during sampling activities was containerized in properly labeled DOT-approved <br /> 55-gallon drums, and stored on-site in an area lacking public access At the completion of soil and <br /> I groundwater sampling, all soil borings were backfilled over their entire depths with a portland cement <br /> grout mix <br /> I23 GROUNDWATER AND SOIL SAMPLE ANALYSIS <br /> After collection,the soil and groundwater samples were transported in a chilled container to Associated <br /> Laboratories under chain-of-custody protocol, as requested by Thrifty Oil Company The samples were <br /> shipped on 19, 21 and 24 November 2003, via Golden State Overnight, an overnight delivery service <br /> All collected samples were analyzed for <br /> • Benzene Total petroleum hydrocarbons quantified as gasoline(TPH-g)in accordance with EPA <br />' Method 8015-Modified, and <br /> • The aromatic hydrocarbons benzene, toluene, ethylbenzene and total xylenes (BTEX) and the <br />' fuel oxygenate methyl tertiary-butyl ether (MTBE) in accordance with EPA Method <br /> 8260-Modified <br /> 3.0. FINDINGS <br /> The computer-generated CPT lithologic logs were integrated with previous subsurface soil descriptions <br /> to construct the subsurface geological model, the hydrocarbon impact to groundwater and soil was <br />' quantified by laboratory analysis of the grab groundwater and soil samples, as presented below <br /> 31 STRATIGRAPHY <br /> Based on the findings from the CPT soil borings,supplemented with data from existing monitoring well <br /> and soil borings, cross section A-A' was constructed to depict general lrthology beneath the site <br /> (Figure 3) <br /> Soil collected during the CPT Investigation from depths of near surface to approximately 65 feet bsg, <br /> 75 feet to 90 feet bsg, between 100 feet and 105 feet bsg to 110 feet bsg and from 115 feet bsg to total <br /> depth consisted dominantly of clay,silt,clayey silt,and silty clay Coarse-grained soil consisting of silty <br /> Advanced GeoEnvironmentai,Inc <br />