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Oak\ AW N i� 04 September 2007 AGE-NC Project No. 95-0121 Page 8 of 9 concentrations in the well effluent stream will be measured at regular intervals. An OVM will be i utilized for field measurements and sample from the pilot test influent will be collected. 3.4.2. Collection and Analysis of Vapor and Ground Water Samples Vapor samples will be collected at the start of the test, at least twice for two days (i.e., 4 samples) and then one sample at the end of the test (day five); the samples will be collected in Tedlar bags using the organic vapor analyzer as an air pump. A water sample will be collected of the DPE liquid effluent stream daily and if necessary, from the holding tank at the end of the test. A ground water sample will be collected from wells AW4 , AW-2, VW- 1 , V W-2, and MW-1 through MW-3 prior the start ofDPE test and following the DPE test to evaluate the dissolved concentration changes due to the DPE extraction. A sample of the water extracted will be collected on the final day of the pilot study to established disposal concentrations and mass removed. Based on data obtained from the vapor and water sampling, AGE will qualifythe success of the test and implementation of a full scale system. The water samples will be collected into 40-m1 VOA vials containers. Following sample collection, the samples will be placed in a chilled container and transported under chain-of-custody to a State of California DHS-certified analytical laboratory. Each sample will be analyzed within 72 hours of collection for the following: • TPH-g by EPA Method 8015 Modified; • BTEX, the fuel additives MTBE, TBA, DIPS, ETBE, TAME, EDB and 1 ,2-DCA by EPA Method 8260, 3 .4.3 . Reporting Following completion of remediation activities and laboratory analysis, a comprehensive report, including a description of all field activities, laboratory reports, contour maps of remaining TPH-g, benzene, MTBE and 1 ,2-DCA concentrations and mass balance equations to determine the amount of hydrocarbons removed will be compiled. Additionally, a discussion of how effective the high vacuum systemhas been and recommendations for further remediation or additional alternatives will be included. Advanced GeoEnvirenmenfal, Inc.