12. Existing EA (2016)

Permit

Environmental authority EPPR00439413

 

Table 3: Contaminant release limits to water

 

 

 

 

 

 

 

 

 

. nae Pass va Minimum monitoring
Quality characteristics | Release limits Limit type frequency**
pH 7.0-8.5 Range Daily when dredging
Dissolved Oxygen 6 mg/L Minimum Daily when dredging
Turbidity Must not exceed:
e 2NTU above
background where
the background*
value is less than 20
NTU; or N/A Daily when dredging
e 10 percent greater
than a background
value where the
background value is
greater than 20 NTU.
Suspended Solids 20" percentile - 6 mg/L
. Daily representative
jth i
50" percentile — 10 mg/L N/A sample when dredging
80" percentile — 16 mg/L
Oil, Grease, Scum and Not visible or otherwise NA Daily representative
litter noticeable sample when dredging

 

 

 

*For the purpose of this condition, a “background value” for a quality characteristic is the value of the quality characteristic
measured at a background sampling and in situ monitoring points in the receiving waters not affected by the release
situated between fifty (5) and one hundred (100) metres up-current from the release point and the background must be
measured one hour either side of the local high water and local low water.

**Associated monitoring requirements

1. Monitoring must be conducted in accordance with the methods prescribed in the current edition of the administering
authority's Monitoring and Sampling Manual 2009.

Water quality samples must be representative of water being tested.

All determinations must employ an analytical practical quantification limits of sufficient sensitivity to enable reliable
comparisons to be made against the assessment criteria relevant to the particular water quality characteristic.

4. Monitoring must be undertaken during a release as per the frequency stated.

All monitoring devices must be correctly calibrated and maintained.

 

2-W3

The only contaminants to be released to surface waters are bed sediments necessarily disturbed
during dredging and releases must occur in accordance with Table 3: Contaminant release
limits to water and the associated monitoring requirements.

 

2-W4

The deposition of dredge material on the beach nourishment areas must not result in a visible
plume twenty-five (25) metres from the point of entry of the wastewater runoff (condition 2-G3
provides a definition of ‘beach nourishment area under this schedule).

 

2-W5

 

 

The generation of a plume from the dredge of material within the dredge footprint must not
result in a visible plume thirty (30) metres from the point of suction of the dredge material
(condition 2-G2 provides a definition of ‘dredging area’ under this schedule),

 

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Department of Environment and Heritage Protection