Schlumberger vertical electrical soundings have indicated that a plume of pollution within the shallow unconfined aquifer extends SW from the Kraft cheese factory for 1 600 metres. The plume is ovoid in shape and up to 650 metres wide. The polluted aquifer zone attains a maximum thickness of 10 metres, SW of the factory. The margins of the polluted zone are diffuse and difficult to map due to the resolution limits of the method used. The salinity of the polluted zone varies but 2 000 - 6 500 mg/l could be expected. Salinities near the margins of the zone are expected to be less due to dilution and diffusion.