Fig. 6. Concentration of fecal coliforms (FC) in leachate from the oxidation pond effluent (OPE)-irrigated lysimeters in relation to organic carbon (OC) concentration in the leachate. Data are from all sand- and soil-packed, unplanted (at LF 1), and Eucalyptus planted lysimeters (at LF 0.2 and intermittent leaching), and from all the sampling events where both FC and OC data were available.