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h) Estimate travel times or velocities for air through the target zone Do the travel <br /> times/velocities indicate adequate throughput in the entire target zone? (Consider three- <br /> dimensional flow, particularly at open or leaky sites Refer to EM 1110-1-4001, Chapter 5) <br /> 6) Adequacy of Operations and Maintenance <br /> a) Has the entire system been operating with enough consistency to achieve its objective in a <br /> reasonable time? (A good operational target should be 90% uptime or better) <br /> b) Are monitoring points constructed and maintained so as to yield reliable results (e g , short <br /> screens, checked for plugging/response)? <br /> c) Would the use of active or passive air infection possibly help direct air through the target zone <br /> more effectively? Would a surface cover help direct air more effectively through the target zone <br /> (the surface cover cost would have to cost effective)9 <br /> d) Verify that the ancillary equipment are maintained per manufacturers recommendations <br /> e) Verify that instruments, controls, and alarms are working Are there provisions to notify an <br /> operator of malfunctions when the unit is unattended9 <br /> f) Is the vapor extraction properly distributed among the wells to optimally treat the target zone <br /> effectively? (It may be appropriate to recommend an optimization study if there is some <br /> indication that the system is pumping more than necessary to achieve goals) <br /> 9) v cl lly tuaL L11G 14V11LUi1L1aL1V11.7 a1C. JaixipiGu allu allalyGcu In accGrt.Lvv <br /> anoL 1L11 L11%, Ja }1 <br /> 11111116 axlu <br /> analysis plan designed to assess the system performance Determine if any additional monitoring <br /> is needed to evaluate the operating conditions <br /> 7) Typical Performance Problems <br /> 06/07/99 <br /> Page 5 of 8 <br />