1. Potentiometric surfaces of November 1989 and declines in the potentiometric surfaces between November 1982 and November 1989 for the Black Creek and Middendorf aquifers in South Carolina Yale Public content 1993. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey ; Copies may be purchased from Books and Open-File Reports Section. English. Public. South Carolina and Black Creek Aquifer (S.C. and N.C.).