Response to outstanding issues - ADG1786.25 Dewatering Management Plan_Rev1_07.10.25-compressed · MCU25/0020

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environmental harm unless the person takes all reasonable and practicable measures to prevent or
minimise the harm”.

Proposed water quality objectives

The proposed water quality objectives that have been developed for the discharge of extracted
groundwater from the site are provided in the Tables below. All water discharged from the site must
comply with the discharge criteria provided in Table 2. In addition, the receiving water quality within a
20 m radius of the discharge point entry to the receiving water shall comply with the receiving water
criteria provided in Table 3. Receiving waters data will be assessed against background monitoring data

if non-compliant results are obtained at the receiving waters monitoring location.

Table 2 Discharge criteria

Parameter Criteria

Physico-chemical

pH (pH units) 6.5-8.5!

Dissolved oxygen (% saturation) 2802

Suspended solids (mg/L) <501?

Turbidity (NTU) <502

Litter None visible

Totals metals (ug/L)

Aluminium No ANZG criteria / 200?

Iron No ANZG criteria / 3002
Table notes:

1. QWAQG 2009 (2013) Refer to Table 8.2.1. Summary of design objectives for management of stormwater quality and flow —

construction phase of development in Queensland.
2. Typical discharge criteria recognised throughout Queensland & NSW.

3.Criteria subject to anticipated Development Application (DA) notice and conditions by Noosa Shire Council.

Table 3 Receiving waters criteria

Parameter Criteria
Physico-chemical
pH (pH units) 7.8 - 8.31
Dissolved oxygen (% saturation) 85-105!
Suspended solids (mg/L) <14t
Turbidity (NTU) <6t
Dissolved metals (ug/L)
Aluminium 37
Arsenic No relevant ANZG criteria available
Cadmium 5.5?
Chromium 4.47
Copper 1.32
Iron No relevant ANZG criteria available
Lead 4.42
Nickel 702
Zinc 8
Mercury 0.42
Totals metals (ug/L)

 

ADG1786.25 Dewatering Management Plan_Rev1_07.10.25

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