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L26 February 2007 <br /> AGE-NC Project No. 99-0669 <br /> LPage 2 of 4 <br /> 4 2.2. PROBING AND COLLECTION OF SOIL VAPOR SAMPLES <br /> Based on the estimated vertical and lateral extent of petroleum-impacted soil (Site Conceptual <br /> E Model, dated 29 March 2004),AGE proposes advancement of six soil-gas vapor probe borings to <br /> L evaluate vapor intrusion at the site (Figure 2). Initially, each soil boring will be advanced to <br /> maximum,depths of5�bs .However,total depths of borings will be based on field conditions, <br /> j field observations and field screening using an organic vapor monitor(OVM).One soil vapor sample <br /> L will be collected from each boring at a depth of approximately 5 feet bsg. Field procedures for <br /> advancement of borings and collection of soil vapor samples are presented in Section 3.1. <br /> LSoil vapor samples will be analyzed by a State of California Department of Health Services(DHS)- <br /> certified laboratory for the following constituents: <br /> L • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Methods 5030/8015 Modified; <br /> �. • Volatile aromatic compounds (benzene, toluene, ethylbenzene, xylenes: BTEX) in <br /> accordance with EPA Method 8020; <br /> L • Oxygenated compound(methyl tertiary butyl ether:MTBE)in accordance with EPA Method <br /> 8020; and ar <br /> L • 1,2-DCA by EPA Methods 8260 Modified <br /> Laboratory reports for soil vapor analyses, testing methods, laboratory quality assurance/quality .y <br /> control(QA/QC)reports, and sample chain of custody documentation will be presented in a report <br /> with findings and recommendations. <br /> 2.3. REPORT PREPARATION <br /> LFollowing 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-vapor <br /> sampling and analysis. Conclusions and recommendations will also be included in the reports, if <br /> applicable.The report will be in a format acceptable to the SJCEHD and the CVRWQCB guidelines, <br /> and will be reviewed and signed by a California Professional Geologist. <br /> L <br /> Advanced GeoEn"ronmeatnl,Ine. <br /> L <br /> L <br />