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Revised Additional Vapor and Groundwater Monitoring Well Work Pian Raymond Investment Corporation October 30,2009 Page 8 V probe tubing will be approximately 7.5 feet. Each purge volume will therefore be approximately 30 cc. A laboratory-supplied manifold will be used for connections during sampling, if available. A Summa L. canister will be used for purging if a manifold is used, or a syringe will be used if direct connections are made. Compression fittings will be used for all connections. After the tubing has been purged, a Summa canister will be connected to the tubing and a soil vapor sample will be extracted from the boring. A flow controller will be used, in conjunction with an integrated filter and pressure gauge, for the collection of the sample to limit the flow to approximately u 167 ml/minute�buring sample collection, a leak-detection compound (1,1-difluoroethane) will be applied around the tubing fittings and Summa canister. Sample volume will be controlled by time and the flow controller such that approximately 33 minutes of sampling time are required. The target sample volume is LM 5,000 to 5,400 ml. The time required may be adjusted for actual Site conditions and flow rates. The Summa canister will be checked for end pressure, and checked to confirm sample collection by connecting a gauge to the canister and confirming that vacuum pressure is 3 to 5 inches of mercury. A duplicate sample will be collected from one of the vapor well locations. An ambient air sample will also be collected from the air near.acwefl'(ambient blank), and another sample will be inside the building (indoor air) during sample collection.An Air Toxics critical orifice device may be used, if available, with a lower flow ar to and longer sampling time of two hours for these samples. These additional samples will r'' { be used for comparison to soil vapor results and estimation of attenuation factors or for quality control. pf�1 r',�j�� The Summa canisters will be labeled for sample identification and delivered under chain-of-custody 1Lr IYi w procedures to a California-certified laboratory for analyses. 5.0 LABORATORY ANALYSES The soil and groundwater samples collected from borings will be analyzed for TPH-G. TEPH-D, and La TEPH-MO by EPA Method 8015M; and for BTEX by EPA Method 802113. The soil v�por samples collected will be analyzed for BTEX,~total petroleum hydrocarbons-vapor (TPH-V), naphthalene, gasoline additives/oxygenates, and 1,1-di fluoroethane (leak detection compound)by EPA Method TO-15 and TPH-D by EPA Method TO-17. The gasoline additives/oxygenates will include TBA, MTBE, DIPE, ETBE, and TAME. v� 6.0 REPORTING Condor will prepare a report detailing the findings of the investigation and well installation to be LO submitted to the SJCEHD. The report will include a discussion of the field and laboratory procedures used to conduct the investigation, a discussion and presentation of the analytical results, and recommendations including a sampling and analysis plan. Condor will prepare a separate report as an updated Site conceptual model which will include three-dimensional models. Condor will use the data collected to prepare a remediation feasibility report. el- +V i.. tia1� CONDOR