Evaluation of the Pleistocene aquifer in the Uley South Basin has been continued with limited geological mapping and the carrying out of three pump tests. The tests indicate that individual holes may yield supplies of us to 2.5 cusecs for extended periods (in excess of 100 days). However aquifer characteristics determined from the tests are at variance with characteristics determined from previous tests. From the investigations carried out so far the following conclusions may be drawn: 1. The boundaries of the Pleistocene aquifer require more accurate delineation. 2. Areas of concentration of sink holes may represent areas of cavernous aquifer and thus potential recharge zones. 3. There is a possibility of hydraulic connection between the Uley South Basin and the Uley Wanilla Basin, with consequent underground recharge of the Uley South Basin. 4. Aquifer characteristics determined from pump tests may not be reliable for use in basin analysis. Thus estimates of safe yield based on pump test results should be viewed with caution until confirmed by other methods of assessment. 5. Future investigations aimed at full delineation and evaluation of the basin should include surface mapping, drilling of observation holes, geophysical surveys, pump testing, and observation of rainfall and run-off phenomena.