(1) Chronic violations, defined here as those in which sixty-six percent (66%) or more of all of the measurements taken for the same pollutant parameter (except pH) during a six (6) month reporting period exceed (by any magnitude) a numeric pretreatment standard or requirement, including instantaneous limits.

(2) Technical review criteria (TRC) violations, defined here as those in which thirty-three percent (33%) or more of all of the measurements taken for the same pollutant parameter during a six (6) month reporting period equal or exceed the product of the numeric permit limit, or pretreatment standard or requirement including instantaneous limits, multiplied by the applicable TRC (TRC = 1.4 for BOD, TSS, FOG, and 1.2 for all other pollutants (except pH)).

(3) Violations of wastewater discharge pH limits, defined here as those in which thirty-three percent (33%) or more of all of the discharge pH measurements taken during a six (6) month reporting period are less than 6.0 or greater than 10.5 standard units;

(4) Any other violation(s) of a pretreatment standard or requirement (daily maximum, long-term average, instantaneous limit, or narrative standard) that the Director believes has caused, alone or in combination with other discharges, interference (e.g., slug loads) or pass-through; or endangered the health of the POTW personnel or the public.

(5) Any discharge of a pollutant that has caused imminent endangerment to human health/welfare or to the environment and has resulted in the POTW’s exercise of its emergency authority to halt or prevent such a discharge.