2 There is poor comparability between the total recovery rate estimated by summing up rates from all the operating SVE wells and comparing these to the recovery rate estimated using influent data collected at the Main Header. This has been primarily attributed to inaccuracies in the historical methods used to measure the vapor flow rate at individual extraction wells. It is expected that as the remaining controls and wellhead assemblies are modified in 2018, there will be better agreement in the total recovery rates estimated via these two methods.