or well conduit integrity thereby permitting detection of leaks in the casing or production string the fiber optic line also permits the monitoring of gas lift valves from the thermal profile of the well in other embodiments the fiber optic line may include one or multiple sensors or sensor locations the sensors or sensor locations are adapted to measure a parameter of interest such as temperature distributed temperature pressure acoustic energy electric current magnetic field electric field flow chemical properties or a combination thereof the sensors may be fiber optic sensors electrical sensors or other types further the alternative path conduit can be used to pump both multi mode and single mode optic fiber into the same well bore thereby permitting calibration and correlation of backscattering signals to improve the resolution of the optical time domain reflectometry analysis of deep subsea wells in an alternative embodiment an electrical cable can be disposed in the alternative path conduit instead of the optical fiber the electrical cable may include one or more sensors or sensor locations as in the case of the optical fiber the optical fiber and the electrical cable are generally referred to herein as a u201c cable u201d well logging is often accomplished by disposing a tool down a wellbore with a variety of tools located thereon these tools may be inserted into the well bore adjacent the production flow line and therefore never risk causing obstruction or damage to these very expensive deep water well projects any cased hole logging tool can be disposed and run from a tubular member adjacent the production tubing these include.