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g Estimated travel time or velocities for air through the target zone Do travel <br /> times/velocities indicate adequate throughput in the entire target zone? <br /> ENSR has estimated travel time or velocities for air in the target zone <br /> 6 Adequacy of Operations and Maintenance <br /> a Has the entire system been operating with enough consistency to achieve <br /> its objective in a reasonable time? (A good operational target should be <br /> 90 uptime or better) Aside from the shut down on November 30, 2005, the <br /> SVE system had been operating with minimal downtime Since the SVE system <br /> was restarted in September 2004 and ceased to operate in November 2004 it <br /> has not been operated long enough to measure its ability to achieve its objective <br /> b Are the monitoring points constructed and maintained to yield reliable <br /> results (e g , short screens, checked for plugginglresponse)? The SVE <br /> wells appear to have been constructed properly with short well screens located <br /> above the water table However, ENSR has been unable to sample extraction <br /> well MW-25S during the previous two site visits as a result of a submerged well <br /> screen According to field data obtained during those visits, ENSR personnel <br /> have found the well to be submerged below the water table However, the well is <br /> supposedly screened above the water table Determining if MW-25S has a <br /> • plugged well screen will require further investigation <br /> c Would the use of active or passive air injection possibly help direct air <br /> through the target zone more effectively? Would a surface cover help <br /> direct air more effectively through the target zone (the surface cover cost <br /> would have to be cost effective)? Active air injection, in the form of in-situ AS <br /> is currently being conducted at the site The surface is covered with asphalt <br /> d Verify that the ancillary equipment is maintained per manufacturers' <br /> recommendations Yes, ancillary equipment is maintained according to <br /> recommendations provided by the manufacturers <br /> e Verify that instruments, controls, and alarms are working Are there <br /> provisions to notify an operator of malfunctions when the unit is <br /> unattended? An environmental equipment technician visited the site on <br /> September 22, 2004 and performed a major service on the SVE equipment On <br /> that date it was verified, by the technician and ENSR that the equipment related <br /> to the SVE system including all instruments, controls, and alarms, were in good <br /> i d t „ C'n NoVembef 3n 2004 The CVF system chtit rtcaif rinwn ac n <br /> worlun co�,..i io, ,. <br /> result of a failure in the exterior wall of the thermal oxidizer <br /> f Is the vapor extraction properly distributed among the wells to optimally <br /> treat the target zone effectively? (!t may be appropriate to recommend an <br /> optimization study if there is some indication that the system is pumping <br /> more than necessary to achieve goals) The vapor extraction wells are <br /> installed in the vicinity of locations previously identified as raving elevated levels <br />