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3 a <br /> 10 February 2009 <br /> AGE-NC Project No. 95-0173 <br /> Page 3 of 8 <br /> between 5 and 15 feet north-northeast of well AW-1 to assess potential vapor intrusion and <br /> to confirm cleanup progress of petroleum hydrocarbon-impacted soil. <br /> • Soil boring B-13 will be located between 5 and 15 feet north of well AW-2 to confirm <br /> interim remediation SVE progress at the site. <br /> A single soil vapor sample will be collected from borings B-11 and B-12 at a depth of approximately <br /> feet bsg. Field procedures for advancement of soil vapor borings and collection of soil vapor <br /> samples are presented in Section 3.2. Soil vapor samples will be analyzed by a State of California <br /> Department of Public Health Services (CDPH)-certified laboratory for the following constituents: <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Methods 8015 Modified (TO-13) and <br /> • Volatile aromatic compounds(benzene,toluene,ethylbenzene,xylenes:BTEX)and volatile <br /> organic compounds(VOCs)Oxygenated compound(methyl tertiary butyl ether: MTBE)in <br /> accordance with EPA Method 8260 (TO-15). ' <br /> Soil borings B-11, B-12 and B-13 will be advanced to depths of approximately 40 feet bsg <br /> (estimated depth to first encountered ground water). Total depth of each boring may vary slightly <br /> according to geologic conditions encountered during drilling. Field procedures for soil sample <br /> collection is presented in Section 3.2.; selected soil samples from B-11, B-12 and B-13 will be <br /> analyzed by a CDPH-certified laboratory for the following constituents: <br /> • Total petroleum hydrocarbons quantified as gasoline and diesel(TPH-g)in accordance with <br /> EPA Methods 8015 Modified, <br /> • Volatile aromatic compounds - benzene, toluene, ethylbenzene and xylenes (BTEX) in <br /> accordance with EPA Method 8260, and <br /> • Fuel additives including 1,2-dichloroethane(1,2-DCA),ethylene dibromide(EDB),tertiary <br /> butanol (TBA), di-isopropyl ether (DIPS), ethyl tert butyl ether (ETBE), tert amyl methyl <br /> ether(TAME) and methyl tert-butyl ether (MTBE)by EPA Method 8260 Modified. <br /> Laboratory reports for the soil analyses,testing methods,laboratory quality as control <br /> (QA/QC) reports, and sample chain of custody documentation will be presented in a report with <br /> findings and recommendations. <br /> Advanced GeoEnvironmental,Inc. <br /> s <br />