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08 May 2008 <br /> AGE-NC Project No. 98-0465 <br /> Page 4 of 6 <br /> an utility clearance obtained through Underground Service Alert. <br /> 3.2. PROBING AND COLLECTION OF SOIL VAPOR SAMPLES <br /> AGE proposes to advance seven soil probe borings near the former UST areas, dispenser area and <br /> adjacent to existing buildings on-site,to evaluate vapor intrusion at the site(Figure 2). Each probe <br /> boring will be advanced to a depth of five feet bsg. Soil vapor samples will be collected from each <br /> boring at four to five feet bsg. Field procedures for advancement of borings and collection of soil <br /> vapor samples are presented in Sections 4.1. and 4.2. <br /> Soil vapor samples will be analyzed by a State of California Department of Public Health(CDPH)- <br /> certified laboratory for the following constituents: <br /> • Total petroleum hydrocarbons as gasoline(TPH-g)in accordance with EPA Method TO3; <br /> • Volatile aromatic compounds benzene, toluene, ethylbenzene, and xylenes (BTEX) and <br /> Isopropyl alcohol (tracer) in accordance with EPA Method TO 15; and <br /> • Fuel oxygenates methyl-tertiary butyl ether (MTBE), di-isopropyl ether (DIPE), ethyl <br /> tertiary-butyl ether(ETBE),tertiary-amyl methyl ether(TAME),and tertiary butanol(TBA) <br /> and lead-based fuel scavengers ethylene dibromide(EDB)and 1,2-dichloroethane(1,2-DCA) <br /> in accordance with EPA Method TO 15. <br /> Laboratory reports for soil vapor analyses, testing methods, laboratory quality assurance/quality <br /> control(QA/QC)reports,and sample chain of custody documentation will be presented in a report <br /> with findings and recommendations. <br /> 33. REPORT PREPARATION <br /> Upon completion of field work,a report will be prepared presenting the findings of the investigation. <br /> The report will include a description of the work performed,results of the sampling and laboratory <br /> analysis, and results for a site indoor air exposure. Conclusions and applicable recommendations <br /> with consideration of the San Francisco Bay Regional Water Quality Control Board's(SFBRWQCB) <br /> Environmental Screening Levels (ESLs)(soil-gas screening levels) and if required the California <br /> Environmental Protection Agency(Cal EPA)California Human Health Screening Levels(CHHSLs) <br /> will be included in the report. The report will be in a format acceptable to the CVRWQCB <br /> guidelines, and will be reviewed and signed by a California Professional Geologist. <br /> Advanced GeoEnvironmentak Inc. <br />