How are presence/absence test samples confirmed (method 8319 and 8364)?
For confirmation follow the steps in Table 1 of method 8319 and 8364.
Follow the steps in Table 1 of Coliforms, Presence/Absence-P/A Broth Method 8319. P/A Broth with MUG Method 8364. Inoculum from incubated presence/absence samples are used to confirm the presence of total coliforms, fecal coliforms or E. coli in the original water sample.