Pipe to soil potential measurements may be made without penetrating the pavement and without trailing wires between the point of connection to the pipe and the available point of {HEAD ~ connection} between the reference electrode and {TAIL ~ the soil} 
between
Pipe to soil potential measurements may be made without penetrating the pavement and without trailing wires between the point of connection to the pipe and the available point of { HEAD ~ connection } between the reference electrode and { TAIL ~ the soil }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL