When using the Colilert (enzyme substrate) method, what does a sample that turns yellow but does NOT fluoresce under a UV lamp indicate?

• Positive for Total Coliforms, Positive for E. coli
• Negative for Total Coliforms, Negative for E. coli
• Positive for Total Coliforms, Negative for E. coli
• Negative for Total Coliforms, Positive for E. coli