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2016-02-02 P&O Committee - Item 3 - Attachment 4 - Mary River Environmental Values and Water Quality Objectives
Mary River environmental values and water quality objectives
1-11
Water area/type Management Water quality objectives to protect aquatic ecosystem EV
(refer Plan intent (level of
WQ1381) protection)
Upper estuary Aquatic turbidity: <25 NTU
waters ecosystem – suspended solids: <25 mg/L
moderately chlorophyll a: <8 µg/L
disturbed total nitrogen: <450 µg/L
oxidised N: <15 µg/L
ammonia N: <30 µg/L
organic N: <400 µg/L
total phosphorus: <30 µg/L
filterable reactive phosphorus (FRP): <10 µg/L
th th
dissolved oxygen: 80 – 105% saturation (20 —>80 percentile)
pH: 7.0 – 8.4
th
secchi depth: >0.5m (20 percentile)
Tidal canals, Aquatic turbidity: <8 NTU
constructed ecosystem – suspended solids: <20 mg/L
estuaries, moderately chlorophyll a: <4 µg/L
marinas and boat disturbed total nitrogen: <300 µg/L
harbours oxidised N: <10 µg/L
ammonia N: <10 µg/L
organic N: <280 µg/L
total phosphorus: <25 µg/L
filterable reactive phosphorus (FRP): <6 µg/L
dissolved oxygen: 85 – 105% saturation
pH: 7.0 – 8.4
th
secchi depth: >1.0m (20 percentile)
For ALL marine All Toxicants in water and sediment as per AWQG (2000):
and estuarine Toxicants in water: refer to AWQG section 3.4 - ‘water quality
waters within this guidelines for toxicants’ (including Tables 3.4.1, 3.4.2, and
Table Figure 3.4.1)
Toxicants in sediments: refer to AWQG section 3.5 - ‘sediment
quality guidelines’ (including Table 3.5.1, Figure 3.5.1)
Release of sewage from vessels to be controlled in accordance with
requirements of the Transport Operations (Marine Pollution) Act and
Regulations.
Comply with Code of Practice for Antifouling and In-water Hull
Cleaning and Maintenance, ANZECC.
Marine/estuarine Aquatic The minimum WQOs needed to restore seagrass to areas where it
waters with ecosystem - has been lost are:
seagrass moderately median total suspended solids: <10 mg/L;
component disturbed median secchi depth: >1.7 m; and
chosen light attenuation coefficient: >0.9.
However, in areas where seagrass is intact, it is more important to
maintain existing water quality. Therefore the WQOs are:
local total suspended solids, turbidity, secchi and light
attenuation is maintained; and
local seagrass distribution and composition is maintained, as
measured by:
• extent of seagrass;
• species diversity; and
• seagrass depth limit.
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Document Set ID: 20002123
Version: 1, Version Date: 21/12/2015
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