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17 April 2008 <br /> AGE-NC-07-1586 <br /> Page 3 of 5 <br /> 3.3. LABORATORY ANALYSIS <br /> The soil samples were transported under chain-of-custody to Cal Tech Environmental Laboratories <br /> (CTEL), a California Department of Public Health-certified laboratory, and analyzed for the <br /> following: <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and motor oil (TPH-mo) in <br /> accordance with EPA Method 8015M; <br /> • Volatile organic compounds,including benzene,toluene,ethylbenzene and xylenes(BTEX), <br /> and methyl tertiary-butyl ether(MTBE) in accordance with EPA Method 8260B; and <br /> • CAM 17 Metals in accordance with EPA Method 6010B except mercury, which was <br /> analyzed in accordance with EPA Method 7471. <br /> 3.4. EQUIPMENT DECONTAMINATION <br /> Prior to sample collection, Geoprobe soil sampling equipment was washed with a solution of <br /> Alconox triple-rinsed with clean water. Geoprobe rods were also washed and triple-rinsed prior to <br /> soil probe boring advancement. <br /> 3.5. BORING ABANDONMENT <br /> Following soil sample collection,the probe-boring locations were backfilled to surface grade with <br /> Portland cement. Grouting of the borings was witnessed by a representative of EHD. <br /> 4.0. FINDINGS <br /> A discussion of field and laboratory results of soil samples collected on 06 March 2008 is detailed <br /> below. <br /> 4.1. SUBSURFACE SOIL PROFILE <br /> Generally, the soil type encountered in borings B2 through B4 was a dark yellow-orange brown to <br /> dark brown silty fine sand. The sand was poorly graded. Approximately, 0.25 inch gravels were <br /> encountered in boring B-3 at depths of 1 foot and 2 feet bsg. <br /> Advanced GeoEnvironmental,Inc. <br />