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27 October 2003 <br /> • AGE-NC Project No 98-0450 <br /> Page 11 of 17 <br /> t5 1 1 Confirmation Soil Sample Collection <br /> Discrete confirmation soil samples were collected at 5-foot intervals,beginning at 10 feet bsg,using <br />' a Geoprobe push-driven 2-inch diameter soil sampler fitted with four six-Inch long brass sleeves <br /> Soil samples were collected to a depth of 35 feet bsg in boring CB2, and to a depth of 35 feet bsg <br /> in boring CB 1 before boring was terminated due to poor drilling conditions Confirmation soil <br /> samples were preserved by covering both ends of the second brass sleeve with Teflon sheets,capping <br /> and sealing with tape Each preserved sample sleeve was labeled with soil boring location, depth, <br /> ' time, date and sampler's initials and was stored in a chilled container under ice <br /> ' S 12 Equipment Decontamination and Boring Abandonment <br /> All probing rods used were cleaned prior to advancement in each probe boring location The <br /> ' sampling equipment was washed in an Alconox solution and rinsed with water prior to each <br /> sampling run to avoid cross-contamination <br /> At the conclusion of soil boring activities, the bonngs were permanently sealed to prevent vertical <br /> migration of contaminants Under EHD oversight, the borehole was backfilled with cement slurry <br /> from the total depth to surface grade <br /> 5 1 3 Laboratory Analysis of Confirmation Soil. Samples <br /> The confirmation soil samples were transported under chain-of-custody procedures to McCampbeIl <br /> Analytical, Inc (MM, a State of California - Department of Health Service (DHS)-certified <br /> ' laboratory in Pacheco, California, to be analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d) in <br /> accordance with EPA Method 8015 Modified, and <br /> • Benzene,toluene, ethylbenzene and xylenes (BTEX) and the fuel additives methyl tertiary- <br /> butyl ether (MTBE), di-isopropyl ether (D1PE), ethyl tertiary-butyl ether(ETBE), tertiary- <br /> amyl methyl ether (TAME), tertiary butanol (TBA), ethylene dibromide (EDB) and 1,2- <br /> dichloroethane (1,2-DCA) in accordance with EPA Method 8260B <br /> 5 14 Analytical Results of Confirmation Soil Samples <br /> ' Petroleum hydrocarbons were detected only in confirmation soil samples collected from boring CBI, <br /> in the former UST area TPH-g was detected in one soil sample (CBI-35) at a concentration of <br /> Advanced GeoEnviron mental,Inc <br />