a quantity of electrolyte disposed in said first container and permeating said bottom closure and said layer of pavement to provide {HEAD ~ ion transport} between said first reference electrode and said {TAIL ~ soil} under said pavement 
between
a quantity of electrolyte disposed in said first container and permeating said bottom closure and said layer of pavement to provide { HEAD ~ ion transport } between said first reference electrode and said { TAIL ~ soil } under said pavement
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 HEAD REL OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH