The Environmental Protection Service is engaged in monitoring programs of the various industrial concerns that constitute potential hazards to the receiving water quality. The Water and Land Quality Group is specifically concerned with measuring deleterious effects to the fisheries resource as specified in the Fisheries Act. Information gathered from these studies provides a basis for early detection of possible environmental damage and subsequent recommendations for remedial action. This surveillance report presents the results of selected physical, chemical and biological parameters of Cronin Creek and the watershed adjacent to Hallmark Resources Ltd., on July 25, 1974.