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16 August 2011 AGE-NC Project No . 97-0301 Page 3 of 11 2 .4 . GROUND WATER SAMPLE COLLECTION AND ANALYSIS All proposed extraction wells, including newly-installed wells, will initially be monitored and sampled prior to remedial operations. The proposed monitoring event will provide baseline concentration values , which will be used to gauge the overall performance of DPE operations . Procedures for ground water sample collection are presented in Section 3 .2 .4, 2 . 5 . INSTALLATION OF REMEDIATION SYSTEM PIPING NETWORK Dual phase extraction remediation system piping will be installed underground in a 24-inch wide by a 18-inch deep trench and utilizing a series of 1 - inch diameter, schedule 40 PVC piping . Additionally, as secondary containment, all 1 -inch diameter DPE remediation piping will be installed inside 2-inch diameter, schedule 40 PVC piping . The proposed trenching lay-out is depicted in Figure 3 ; a cross sectional view of the ground water extraction piping is depicted in Figure 6 . 2 .6 . REMEDIATION SYSTEM FENCING Installation of a 15-foot wide by 25-foot long , chain-link, gated enclosure will be located in southern section of the site to incorporate the DPE remediation system . The proposed remediation system fencing enclosure is illustrated in Figure 3 . 2 .7 , PROPOSED DUAL PHASE EXTRACTION REMEDIATION SYSTEM The proposed DPE system will consist of a 20-horsepower, oil filled liquid-ring blower with a electric fired catalytic oxidizer used to simultaneously extract ground water and soil-vapor from the two proposed DPE wells , VW- 1 through VW-3 and MW-7 (Figure 3 ). The liquid-ring blower under standard temperature and pressure is capable of producing a maximum vacuum of 28-inches mercury (Hg ) with a nominal capacity of 300 cubicfeet per minute(CFM)-System information is providedin AppeMix B,Hydrocarbonimpacted ground water will be treated by processing the extracted water through a series of liquid phase activated carbon vessels . Treated ground water will be discharged in the sanitary sewer system . 2 .8 . REMEDIATION MONITORING AND MAINTENANCE During the dual-phase extraction start-up period (first week of operation ) , influent and effluent-vapor samples and DPE water samples will be collected on a daily basis and submitted for laboratory analysis of petroleum constituents (i . e . TPH-g , BTEX, MTBE , %A, rrt Advanced GeoEnvironmental, Inc.