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20 January 2000 <br /> i AGE-NC Project No 95-0173 <br /> Page 8 of 14 <br /> 3 3 INSTALLATION OF SOIL VAPOR EXTRACTION/AIR SPARGE PIPING SYSTEM <br /> Two-inch diameter, schedule 40 PVC piping will be installed approximately one foot bsg and routed <br /> from the SVE well heads to the vapor extraction unit, one-inch diameter, schedule 40 PVC piping <br /> will be installed approximately one foot bsg and routed from the IAS well heads to an air <br /> compressor The proposed SVE and IAS piping system are illustrated in Figure 4 <br /> Installation of a 15 by 20 foot chain-link gated enclosure will be located in a northwest section of <br /> the site to secure the vapor extraction unit,drop-out drum and air compressor The proposed location <br /> of the gated enclosure is illustrated in Figure 4 <br /> 34 SOIL VAPOR EXTRACTION SYSTEM START-UP PERIOD <br /> During the SVE start-up period (first week of operation), influent and effluent vapor concentrations <br /> will be collected on a daily basis to ensure optimal destruction of recovered hydrocarbon vapors <br /> Operational parameters(air flow,combustion temperature, volume of processed vapor, oxygen level <br /> and the lower explosive limits (%LEL) will be monitored daily during the start-up period <br /> 3 5 MONITORING AND MAINTENANCE ACTIVITIES <br /> Vapor samples from the SVE influent and the effluent will be collected on a monthly basis and <br /> submitted to a State of California Department of Health Services (DHS)-certified Iaboratory for <br /> analysis of the following constituents <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015 Modified and <br /> • Volatile aromatics (benzene, toluene, ethyl benzene and xylenes BTEX) and methyl tert- <br /> butyl ether(MTBE) in accordance with EPA Method 8020 <br /> Laboratory reports for vapor analysis, testing methods, laboratory quality assurance/quality control <br /> (QA/QC)reports, and sample chain of custody documentation will be presented in monthly reports <br /> Vapor influent concentrations,vapor effluent concentrations and operational parameters(combustion , <br /> temperature,volume of processed vapor, oxygen level and the lower explosive limits (%LEL)will <br /> be monitored on a weekly basis to ensure optimal destruction of recovered hydrocarbon vapors and <br /> to monitor cleanup progress <br /> Advanced GeoEnvironmental,Inc <br />