Licence 2613 -Walcha Council -www.walcha.nsw.gov.au

Premises:
Walcha Sewage Treatment Plant, Oxley Highway, Walcha NSW 2354.

The concentration limit of the pollutants at a discharging point is given below:

Pollutant	Units of Measure	90 percentile concentration limit
Oil & Grease	Milligrams per litre	10
pH	pH	6.5 - 8.5
Total Suspended Solids	Milligrams per litre	30
Biochemical oxygen deman	Milligrams per litre	20

The licensee is not taken to have exceeded a quality limit specified in this licence for BOD, TSS or pH if:

Monitoring by the licensee shows that the level of chlorophyll-a in the maturation ponds during any exceedance was 50ug/L or more (showing that the exceedance was caused by excessive algal growth); and
The liquid waste entering the maturation ponds during the exceedance complies with the quality limit.