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I I T. 06 October 2008 AGE-NC Project No. 06- 1457 Page 6 of 7 4.2.2. Collection and Analysis of Soil Vapor, Extracted Water and Ground Water Samples Vapor samples will be collected at the start of the test, twice for the first two days and then daily after startup; samples will be collected in Tedlarbags using an airpump and vacuum chamber. Soil vapor sample will be collected from the effluent of the DPE pump and the effluent of the vapor treatment chamber. A water sample will be collected from DPE liquid effluent stream daily to establishmass removed and disposal concentrations, if necessary atest more frequently from awaste water system. A ground water sample will be collected from wells EW- 1 , MW-3 , MW-4 and other necessary monitoring wells prior to and directly following the DPE test to evaluate the dissolved concentration changes due to the DPE extraction, in additionto the surrounding quarterlymonitoring events. Based on data obtained from the vapor and water sampling, AGE will qualify the success of the pilot study and implementation of a full scale system or enhancing the current ground water extraction technology. Water samples will be collected into 40-m1 volatile organic analysis (VOA) vials containers. Following sample collection, samples will be placed in a chilled container and transported under chain-of-custodyto a CDPH-certified analytical laboratory. Each sample will be analyzed within 72 hours of collection for the constituents listed in Section 3 .3 . 4.2.3 . DPE Feasibility Analysis 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, concentrations and mass balance equations to determine the amount of hydrocarbons removed will be compiled. Additionally, a discussion of how effective the high vacuum system has been and recommendations for further remediation or additional alternatives will be included. 4.2.4. Equipment and Operational Safety The proposed extraction system will be equipped with an automatic shut-down control to prevent any spillage and/or overflow from the holding tank system. This remediation action will be supervised by geologists/scientists trained to perform and supervise investigations and remedial actions at hazardous waste sites as specified in the OSHA Hazardous Waste Operations and Emergency Response Standard [29 CFR 1910. 120 (e)] . Maintenance of the catalytic oxidizer unit will be performed by factory-trained technicians. A temporary fence enclosure will be constructed around the system. Signs will be posted warning of flammable and smoking hazards . Advanced GeoEnvironmenfal, Inc.