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15 January 2007 <br /> AGE-NC Project No. 99-0669 <br /> Page 5 of 10 <br /> control (QA/QC)reports, and sample chain of custody documentation will be presented in a report <br /> with the findings and recommendations. <br /> 2.5. PROBING AND COLLECTION OF SOIL VAPOR SAMPLES <br /> Based on the estimated lateral extent of petroleum-impacted soil(Site Conceptual Model, dated 08 <br /> December 2003), AGE proposes advancement of seven (7) soil vapor probe borings to evaluate <br /> vapor intrusion at the site(Figure 2).Initially,each soil boring will be advanced to maximum depths <br /> of 10 feet bsg.However,total depths of borings will be based on field conditions,field observations <br /> and field screening using an organic vapor monitor (OVM). Soil vapor samples will be collected <br /> from each boring at 5 feet bsg and 10 feet bsg. Field procedures for advancement of borings and <br /> collection of soil vapor samples are presented in Section 3.2. <br /> Soil vapor samples will be analyzed by a State of California Department of Health Services(DHS)- <br /> certified laboratory for the following constituents: <br /> • TPH-g in accordance with EPA Methods 5030/8015 Modified; <br /> • BTEX in accordance with EPA Methods 8020; <br /> • MTBE, TAME, DIPE, ETBE and TBA by EPA Methods 8260 Modified; and <br /> • 1,2-DCA by EPA Methods 8260 Modified <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 /> 2.6. REPORT PREPARATION <br /> Following the completion of the proposed scope of work, a report will be prepared presenting the <br /> findings. The report will include a description of work performed and the results of the soil,ground <br /> water and soil-vapor sampling and analysis.Conclusions and recommendations will also be included <br /> in the reports, if applicable. The report will be in a format acceptable to the SJCEHD and the <br /> CVRWQCB guidelines, and will be reviewed and signed by a California Professional Geologist. <br /> Advanced GeoEnvironmental,Inc. <br />