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




            Table 2 Water quality objectives to protect aquatic ecosystem environmental value (refer to Plan
            WQ1381 for location of waters)
                                                                                                             1-11
            Water area/type      Management         Water quality objectives to protect aquatic ecosystem EV
              (refer Plan       intent (level of
               WQ1381)            protection)

                                                             The following WQOs apply to waters within the Mary River
            MARINE AND                                       catchment. For full coverage of Great Sandy Strait refer to
            ESTUARINE                                        Great Sandy Strait scheduling document.
            WATERS

                                                                                                th   th       th
            Area GSS1 –                Aquatic               Maintain existing water quality (20 , 50 and 80 percentiles),
            lower Mary                 ecosystem – high      habitat, biota, flow and riparian areas. (Refer to Appendix D in
            estuary/Great              ecological value      Queensland Water Quality Guidelines for details.)
            Sandy Strait
                                                                      th   th     th
                                                             The 20 , 50 and 80 percentiles of existing water quality for GSS1
                                                             waters are:
                                                              turbidity: 1 – 2 – 4 NTU
                                                              suspended solids: 4 – 9 – 13 mg/L
                                                              chlorophyll a: 0.6 – 0.8 – 1.3 µg/L
                                                              total nitrogen: 110 – 115 – 160 µg/L
                                                              oxidised N: 2 – 2 – 3 µg/L
                                                              ammonia N: 2 – 7 – 10 µg/L
                                                              organic N: 100 – 100 – 150 µg/L
                                                              total phosphorus: 6 – 10 – 14 µg/L
                                                              filterable reactive phosphorus (FRP): 2 – 2 – 3 µg/L
                                                              dissolved oxygen: 90 – 95 – 105% saturation
                                                              pH: 8.1 – 8.2 – 8.4
                                                              secchi depth: 1.8 – 2.9 – 4.3 m

            Mid estuary                Aquatic               Note for mid estuary waters
            waters                     ecosystem –           For waters shown on the plan as being mid estuary (orange colour)
                                       moderately            and occurring within/adjacent to the inter-tidal zones of Great Sandy
                                       disturbed             Strait: these waters may have water quality characteristics more in
                                                             common with GSS1 water types (lower estuary/enclosed coastal
                                                             waters). Under such circumstances, reference should be made to
                                                             WQOs for GSS1 lower estuary/enclosed coastal waters shown
                                                             above.
                                                              turbidity: <8 NTU
                                                              suspended solids: <20 mg/L
                                                              chlorophyll a: <4 µg/L
                                                              total nitrogen: <300 µg/L
                                                              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
                                                                                                                th     th
                                                              dissolved oxygen: 85 – 105% saturation (20 —>80 percentile)
                                                              pH: 7.0 – 8.4
                                                                                         th
                                                              secchi depth: >1.0m (20 percentile)




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Document Set ID: 20002123
Version: 1, Version Date: 21/12/2015

Mary River environmental values and water quality objectives

          Table 2 Water quality objectives to protect aquatic ecosystem environmental value (refer to Plan
          WQ1381 for location of waters)
          Water area/type      Management         Water quality objectives to protect aquatic ecosystem EV ~
             (refer Plan      intent (level of
              WQ1381)           protection)
                                                The following WQOs apply to waters within the Mary River
          CS TUARINE                            catchment. For full coverage of Great Sandy Strait refer to
          WATERS                                Great Sandy Strait scheduling document.

          Area GSS1 —        Aquatic            Maintain existing water quality (20°, 50° and 80° percentiles),
          lower Mary         ecosystem — high | habitat, biota, flow and riparian areas. (Refer to Appendix D in
          estuary/Great      ecological value | Queensland Water Quality Guidelines for details.)
          Sandy Strait
                                                The 20", 50" and 80" percentiles of existing water quality for GSS1
                                                waters are:
                                                =   turbidity: 1 -2-—4NTU
                                                =   suspended solids: 4 — 9 — 13 mg/L
                                                »   chlorophyll a: 0.6 — 0.8 — 1.3 pg/L
                                                =   total nitrogen: 110 — 115 — 160 pg/L
                                                ="  oxidised N: 2-2-3 ug/L
                                                ="  ammonia N: 2— 7-10 ug/L
                                                ="  organic N: 100 — 100 — 150 ug/L
                                                =   total phosphorus: 6 — 10 — 14 pg/L
                                                « — filterable reactive phosphorus (FRP): 2-2-3 ug/L
                                                =   dissolved oxygen: 90 — 95 — 105% saturation
                                                »   pH: 8.1-8.2-8.4
                                                =   secchi depth: 1.8-2.9-4.3m

          Mid estuary        Aquatic            Note for mid estuary waters
         waters              ecosystem —        For waters shown on the plan as being mid estuary (orange colour)
                             moderately         and occurring within/adjacent to the inter-tidal zones of Great Sandy
                             disturbed          Strait: these waters may have water quality characteristics more in
                                                common with GSS1 water types (lower estuary/enclosed coastal
                                                waters). Under such circumstances, reference should be made to
                                                WQOs for GSS1 lower estuary/enclosed coastal waters shown
                                                above.
                                                =   turbidity: <8 NTU
                                                =   suspended solids: <20 mg/L
                                                =   chlorophyll a: <4 pg/L
                                                total
5	1	1	1	39	2	1153	2440	156	39	93	nitrogen:
5	1	1	1	39	3	1326	2441	89	30	92	<300
5	1	1	1	39	4	1431	2440	79	39	62	pg/L
4	1	1	1	40	0	988	2492	452	39	-1	
5	1	1	1	40	1	988	2501	12	12	0	»
5	1	1	1	40	2	1061	2492	149	31	80	oxidised
5	1	1	1	40	3	1227	2492	36	30	89	N:
5	1	1	1	40	4	1279	2493	67	30	89	<10
5	1	1	1	40	5	1362	2492	78	39	29	ug/L
4	1	1	1	41	0	988	2544	471	39	-1	
5	1	1	1	41	1	988	2553	12	12	0

                                                    ammonia N: <10 pg/L
                                                =~  organic N: <280 pg/L
                                                =   total phosphorus: <25 pg/L
                                                =   filterable reactive phosphorus (FRP): <6 pg/L
                                                =   dissolved oxygen: 85 — 105% saturation (20""—>80" percentile)
                                                ="  pH: 7.0 —- 8.4
                                                =   secchi depth: >1.0m (20" percentile)

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Document Set ID: 20002123
Version: 1, Version Date: 21/12/2015