Document ID: chunk:federal_register_of_legislation:F2024C00957:schedule:2:p1
Version: federal_register_of_legislation:F2024C00957
Segment Type: schedule
Provision Reference: sch 2 (pt 1/2)
Character Range: 124309–127021

Schedule 2—Water pollution—accepted limits
(subregulation 2.02(3) and paragraph 4.02(a))

1.01  Interpretation
  In this schedule:
fresh water means water containing total dissolved solids of less than 1000 mg/l, and includes any water of that quality in a pipe, drain or man‑made channel delivering water for use by humans or animals.
MPN/100ml means most probable number of coliform count per 100 millilitres.
marine water means ocean, sea, coastal or estuarine water, and includes river water affected by the tide.
seasonal mean TSS means the mean total of suspended solids for a climatic season, calculated in accordance with methodology acceptable to an airport environment officer for the airport concerned, taking into account the climatic and topographic conditions of the locality in which the airport is located.
waters has the same meaning as it has in regulation 2.02.

1.02  Indicators of adverse chemical effect
 (1) Without limiting subregulation 2.02(1), the chemical condition of water is adversely affected if an event mentioned in this clause occurs.

Dissolved oxygen
 (2) There is an adverse effect if, because of the entry of a substance into waters, the dissolved‑oxygen content of the waters falls:
 (a) below 6 mg/l; or
 (b) to 80% of the average saturation level for a normal 24 hour period.

pH
 (3) There is an adverse effect if, because of the entry of a substance into waters, the pH of the waters:
 (a) for fresh water—falls below 6.5, or rises above 9.0; or
 (b) for marine water—rises by more than 0.2 pH unit.

Salinity
 (4) There is an adverse effect if, because of the entry of a substance into waters:
 (a) the salinity of the water rises above 1000 mg/l; or
 (b) the salinity rises by more than 5%.

Turbidity
 (5) There is an adverse effect if, because of the entry of a substance into waters:
 (a) the TSS (total suspended solids) of the waters changes by more than 10% from the seasonal mean TSS; or
 (b) visual clarity within the euphotic zone is reduced by more than 10% from the seasonal mean clarity.

Faecal coliforms
 (6) There is an adverse effect if, because of the entry of a substance into waters:
 (a) the median faecal coliform count of test samples of the waters exceeds 150 faecal coliform organisms/100 ml; and
 (b) the faecal coliform count of more than 20% of at least 5 test samples of the waters, taken at regular intervals during a period no longer than 1 month, exceeds 600 faecal coliform organisms/100ml.

Temperature
 (7) There is an adverse effect if, because of the entry of a substance into waters, the temperature of the waters rises by more than 2º C above the seasonal mean temperature.

1.03  Table—accepted limits of contamination
  This