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.
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