The purpose of this ballot is twofold:
1) To evaluate the total chromium levels to the pass/fail criterion for chromium-VI as a “screening level,” above which the contaminant must be evaluated as both species and compared to their individual pass/fail criteria.
2) To eliminate the use of the total chromium level as the pass/fail criterion and replace it with a screening level of 20 ppb (TAC) and 2 ppb (SPAC). |
