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