2 Renmark to border LAP area assessment - EPA - Sa.gov.au

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River Murray and Lower Lakes catchment risk assessment for water quality: Results and management options Highland irrigation practices also increase saline groundwater flows to the river in some horticultural areas (eg Mypolonga, DWLBC 2003a) posing a moderate risk. Turbidity Event discharges from the LMRIA were ranked as a moderate turbidity risk as in large rainfall events, the significant runoff from highland agricultural areas contains high levels of suspended material. Regular discharges were given a low risk ranking, as they are typically less turbid than the ambient river concentrations (although they may contain high colour and the pump outflow itself may disturb sediment in the river). Most other risks were classified as low but moderate risks with a potential cumulative effect are Mannum, Murray Bridge (including Rocky Gully wetland) and Tailem Bend stormwater discharges. Three of the five Tailem Bend stormwater discharge points have gross pollutant traps fitted. Hydrocarbons Several moderate hydrocarbon risks were identified including unbunded diesel irrigation pumps and fuel stores on the edge of the river, urban stormwater discharges and transport infrastructure. The likelihood of accidental spillage from fuel stores and bridges is low but the potential consequences resulted in a moderate risk to aquatic ecosystem health. The hydrocarbon risk from several Tailem Bend petrol stations located close to the River Murray was classified as low. They pose a risk of accidental spillage into the stormwater system and underground leakage from fuel storage tanks. Other low hydrocarbon risks identified were from potential accidental spillage from recreational rivercraft and ferries. Heavy metals The number of risks attributed to heavy metals is few, primarily from urban stormwater discharges, which contribute significant amounts of heavy metals (eg lead, copper, zinc) during rainfall events. These metals are likely to be mostly in particulate form (therefore not immediately bioavailable or toxic) and may be accumulating around stormwater outfalls. The effect of this potential accumulation on benthic (bottom-dwelling) aquatic biota is unknown. The current landfill at Mannum and the disused landfill pond at Sturt reserve (Murray Bridge) were also considered to pose a moderate heavy metal risk, as were the slipways at Mannum, and Long Island and Riverglen marinas (wash-off of metal materials, including metal-containing anti-fouling paints). An arsenic plume under the old railway yards Tailem Bend was assessed as a moderate risk. Monitoring data indicates the plume is currently not leaching to the river. Pesticides All pesticide risks were assessed as low with the exception of the slipways at Mannum, and Long Island and Riverglen marinas. Wash-off from the slipway is likely to contain anti-fouling compounds although there was high degree of uncertainty to this assessment. The river water quality data indicates that pesticides levels were mostly below detection limits (SA Water unpublished data) which supports the current assessment of no high and widespread pesticide risks. 160
Table 6.2 Summary of risks to aquatic ecosystem health environmental values, MW LAP area low=low risk, mod=moderate risk, high=high risk, v high=very high risk, River Murray and Lower Lakes catchment risk assessment for water quality: Results and management options risk certainty value (in italics) follows each risk ranking GEOCODE HAZARD EVENT TYPE NU TU OR HM PE HY SA ANIMAL HUSBANDRY MW002B Piggery, EPA Lic # 12761—Murrawong EVENT DISCHARGE low 2 low 2 MW003B Piggery, EPA Lic # 12759—Glen Lossie EVENT DISCHARGE low 2 low 2 MW262B Piggery, EPA Lic # 12764—Mypolonga EVENT DISCHARGE low 2 low 2 CREEK/RIVER MW080A Wetland discharge, Rocky Gully DISCHARGE mod 2 low 2 mod 2 low 2 low 2 low 2 mod 2 MW080B Creeks/wetland discharge, Rocky Gully EVENT DISCHARGE high 3 high 3 high 3 mod 2 low 2 mod 2 low 2 MW246B Reedy Creek EVENT DISCHARGE mod 2 mod 2 mod 2 low 2 low 2 DREDGING SITE MW132T Dredging, EPA Lic # 14458—adj Westbrook swamp SEDIMENT DISTURBANCE low 3 MW194T Dredging, EPA Lic # 12770—Mannum golf course SEDIMENT DISTURBANCE low 2 MW233T Dredging, EPA Lic # 14347—Ukee Boat Club SEDIMENT DISTURBANCE low 2 EVENT DISCHARGE FERRY MW134B Ferry, Tailem Bend low 3 low 2 low 2 low 2 low 2 MW134C Ferry, Tailem Bend ACCIDENTAL SPILLAGE low 2 MW145B Ferry, Wellington EVENT DISCHARGE low 3 low 2 low 2 low 2 low 2 MW145C Ferry, Wellington ACCIDENTAL SPILLAGE low 2 MW241H Ferry, Mannum ACCIDENTAL SPILLAGE low 2 MW314H Ferry, Mannum EVENT DISCHARGE low 2 low 2 low 2 low 2 low 2 FLOOD-IRRIGATED AREA DISCHARGE MW054A Irrigation area—one dairy farm, Toora DISCHARGE high 3 low 2 high 2 low 2 high 3 MW054B Irrigation area—one dairy farm, Toora EVENT DISCHARGE mod 3 mod 2 mod 2 low 2 low 3 MW059A Irrigation area—retired, feedlot on highland, Mobilong DISCHARGE low 3 low 3 low 2 mod 2 MW059B Irrigation area—retired, feedlot on highland, Mobilong EVENT DISCHARGE low 3 mod 3 low 3 low 2 low 2 MW118A Irrigation area—dairying, Monteith DISCHARGE v high 3 v high 3 low 2 high 3 MW118B Irrigation area—dairying, Monteith EVENT DISCHARGE high 3 mod 3 high 3 low 2 low 3 MW126A Irrigation area—dairying, Woods Point DISCHARGE v high 3 v high 3 low 2 high 3 MW126B Irrigation area—dairying, Woods Point EVENT DISCHARGE high 3 mod 3 high 3 low 2 low 3 MW127B Kilsby swamp—retired land EVENT DISCHARGE low 2 low 3 low 3 low low 2 161
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E N V I R O N M E N T P R O T E C T
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The River Murray and Lower Lakes ca
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6 Mannum to Wellington LAP area ass
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Table 6.5 Frequency of risk to recr
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Figure 7.2 Example of hazard to wat
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Roz Becker, Riverland Tourism Assoc
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Abbreviations 10 ADWG Australian Dr
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Executive Summary The River Murray
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River Murray and Lower Lakes catchm
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2 Renmark to border LAP area assessment - EPA - Sa.gov.au

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