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 {TAIL ~ said first reference electrode} and said 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 { TAIL ~ 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 OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH