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