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Soil-Vapor Sampling and Analysis Work Plan <br /> Former Shell Central Valley Crude-Oil Pipelines August 15,2007 <br /> Machado Property(Neighborhood B)Parcel 209-060-08 Page 4 of 4 <br /> • Leak testing will occur at each soil-vapor sample location to ensure that the seal around the probe <br /> is adequate and ambient air is not diluting the sample. Immediately before sampling,a leak- <br /> check compound(e.g.,tetrafluoroethane)will be placed at each probe connection where air could <br /> enter the sampling system. <br /> • Prior to sampling each location,the stagnant air in the sampling tubes will be removed; three <br /> purge volumes will be removed at a rate of 200 mL/min. <br /> • Soil-vapor samples will be collected in 6-liter Summarm canisters,which will be labeled with <br /> identifying information and placed in a cooler for transportation to the laboratory.Chain-of- <br /> custody documentation will be maintained for each sample collected. <br /> Laboratory Analytical Method <br /> Soil-vapor samples will be analyzed for BTEX. naphthalene, and tetrafluoroethane by U.S. EPA Method <br /> TO-15. <br /> REPORTING <br /> Following receipt of analytical results, SAIC will prepare a report describing the results of the field <br /> investigation. Based on the soil-vapor results,an evaluation will be made for potential risk of soil-vapor <br /> migration from soil and/or groundwater to indoor air following property development. The soil-vapor <br /> results will be compared to the soil-vapor values published in the document titled Use of California <br /> Human Health Screening Levels (CHHSLs) in Evaluation of Contaminated Properties published by <br /> CaUEPA in January 2005. Based on investigation results, SAIC will provide recommendations for <br /> further site activities. <br /> If you have any questions regarding this work plan,please call me at(510)466-7161. <br /> Sincerely, <br /> SCIENCE APPLICATIONS INTERNATIONAL CORPORATION <br /> if <br /> Michael Hurd, CHG 0068 <br /> Senior Environmental Project Manager <br /> cc: See attached distribution list <br /> Enclosures: <br /> Figure 1: Vicinity Map <br /> Figures 2-4: Proposed Soil-vapor Boring Locations <br />