UNDERGROUND WATER pollution is of primne imiportance to public health officials concerned with safeguarding, the potability of water supplies. A study by Stiles and associates (1) has been considered a classic in this field. An extensive inquiry into grolundl water pollution from experimiiental latrines was made by Caldwell and Parr (2). And more recently the sanitary engineering research laboratory of the University of Californiia (3, 4) has inivestigated several asl)ects relating to the conservation of ground water by the reclamation of sewage effluents througlh direct recharge into the ground water. In studying the lateral movement of simulated bacterial and chemical pollutants through ground water in an Alaskan area, our first task was to find suitable indicators whichiwould persist during a winter in a subarctic climate.
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