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27 March 2000 AGE-NC Project No. 98-0450 Page 12 of' ]9 A one-inch diameter PVC piping network will carry air ti-ont the compressor to the spar-Ing, wells. The PVC piping ,vill be installed six inches below the ground surface. A PVC flow control valve will be installed at each sparging well to direct the air flow. 4.8. INSTALLATION OF GROUND WATER MONITORING WELL The apparent groLlnd water flow direction at the site is toward the south. To monitor ground water down -radient of the site an additional well should be installed. The well should be installed on the southern edge of Lodi .Avenue in the sidewalk. The proposed well location is depicted in Figure 2. The desiun of the ground water well is depicted in Figure 12. Ground water sample collection will be performed in accordance with pertinent applicable sampling protocols, as detailed in quarterly reports. prepared by AGE. 4.9. PROGRESS/CONFIRMATION SAMPLING Quarterly ground water monitoring and sampling will be performed at the site on all associated ground kvater n1onito1-itlg tlu-oughout the remediation period to monitor remediation progress. Depth to (around water and dissolved oxygen measurements will be collected oil a monthly basis to determine if ground water moLuldin- is occurring as a result of the TAS system. Aller approximately 12 months of operation or after efficiency of the SVE unit has declined, soil samples will be collected from the area of petroleum-hydrocarbon impact at the site. Analytical results of' soil samples will serve to assess the remaining petroleLtm hydrocarbon mass and to determine ifcontinued remediation efforts is required. Selected soil samples will be analyzed by a DHS-certified laboratory for the ]ollowing constituents: • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPII-d, respectively) in accordance with LPA Method 8015 Modified: • Volatile aromatics (benzene, toluene, ethyl benzene and xylenes: BTEX) and methyl tert- butyl ether(MTBF,) in accordance with EPA Method 8020 and • Fuel oxygenates including MTBE, tertiary-butyl alcohol (TBA), di-isopropyl ether (D]PFI). ethyl tertiaFV-butyl ether (ETBE) and tertiary-amyl methyl ether (TAME) by EPA Method 8260 Modified. Laboratory reports For soil analysis. testing methods, laboratory quality assurance/quality control (QA/Q(') reports, and sample chain of custody C10CL1111entation will be presented in a report with findings and recommendations. Advanced Geoi-."m m iroamenta€,Ine,