FIG. 1.

Locations of sampling sites and boreholes drilled at a livestock farming area in Wonju, Korea. Numbers on the contours show altitudes above sea level (in meters). W3, used as an uncontaminated control, is a 120-m-deep borehole located adjacent to the cattle sheds. Borehole W1 is located downstream from the lagoon and the livestock waste disposal sites and is contaminated with livestock wastewater. Livestock wastewater samples were taken from a livestock wastewater storage lagoon (Lagoon) and an animal waste dump site (WDS).