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