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 Other moderate risk sources included stormwater discharges at the townships (with potential cumulative effects around Goolwa of highest concern), and informal camping (no sanitation facilities) areas at Boggy Lake and Duthalamung. Turbidity Stormwater discharges presented a moderate risk, particularly around Goolwa. The Angas River also posed a moderate risk during event discharges. People are likely to avoid swimming/skiing during rainfall conditions so these risks may be mainly to aesthetic values. Vessel launching areas presented a low risk. Turbidity and bank erosion due to recreational boating activities has been highlighted as a community concern but its actual impact on recreation values was difficult to quantify. This issue is probably much less relevant in the Lower Lakes area than in the river due to the increased influence of wind action on turbidity in the Lower Lakes. However, the importance of managing and maintaining vegetation cover on the lake edges and controlling grazing in the riparian area cannot be underestimated. Both LAP groups in this area have identified erosion as an issue (as a result of wind, water and animals) and offer assistance to landholders with revegetation and fencing efforts. Nutrients A moderate nutrient risk level was assigned to discharge from the Angas River and marinas (with the exception of the Hindmarsh Island marina which was given a low level risk for the reasons noted above). Low risk sources included informal camping areas (eg Boggy Lake and Duthalamung), wetlands, toilets/septic tanks (eg Meningie Caravan Park, Marks Point shacks), and wastewater infrastructure (eg STEDS pumps at Meningie, vessel waste disposal station at Goolwa). The risk posed by nutrients to primary contact recreation is assessed for the possible production of algal blooms. It is unlikely that one low-moderate nutrient risk will result in an algal bloom of a scale that would affect recreational values. However, cumulative inputs from many nutrient risks in a confined area may contribute to blooms when environmental conditions (eg temperature, turbidity, light) are suitable (Geddes 1988). Hydrocarbons Low hydrocarbon risks were assessed for urban stormwater discharges (eg Goolwa). There was some uncertainty to this assessment and some of the larger/commercial catchments in Goolwa may present a moderate risk. However, people are not likely to swim or ski during rainfall conditions so the risk is mainly to aesthetic values. Other low-level hydrocarbon risks included vessel launching and mooring areas (eg Clayton West and Goolwa Aquatic Club, various marinas), petrol stations and pump fuel stores, and the Narrung ferry. 212
Table 7.4 Summary of risks to recreational environmental values, GW & CD LAP areas low=low risk, mod=moderate risk, high=high risk, v high=very high risk certainty value (in italics) follows each risk ranking River Murray and Lower Lakes catchment risk assessment for water quality: Results and management options GEOCODE HAZARD EVENT TYPE PA TU NU HY CREEK/RIVER GC112A Angas River DISCHARGE low 2 mod 2 GC112B Angas River EVENT DISCHARGE mod 2 mod 2 low 2 FERRY GC037B Ferry, Narrung EVENT DISCHARGE low 2 low 2 GC037C Ferry, Narrung ACCIDENTAL SPILLAGE low 2 FUEL STORE GC011C Pump fuel store, Meningie ACCIDENTAL SPILLAGE low 2 INFORMAL CAMPING GC028G Informal camping, Duthalamung HUMAN/ANIMAL EXCRETION mod 3 low 3 GC122G Informal camping, Boggy Lake HUMAN/ANIMAL EXCRETION mod 2 low 2 LANDFILL GC044L Disused landfill, Narrung LEAKAGE low 1 low 2 GC108L Disused solid waste landfill LEAKAGE low 1 low 2 MARINA GC076Q Marina, Birk's Harbour MARINA DISCHARGES mod 2 mod 2 low 2 GC077Q Marina, Chippy's MARINA DISCHARGES mod 2 mod 2 low 2 GC078Q Marina, Fiore MARINA DISCHARGES mod 2 mod 2 low 2 GC081Q Marina MARINA DISCHARGES mod 2 mod 2 low 2 GC088Q Goolwa regatta yacht club MARINA DISCHARGES mod 2 mod 2 low 2 GC090Q Marina, Alongshore Marina MARINA DISCHARGES mod 2 mod 2 low 2 GC093Q The Marina, Hindmarsh Island MARINA DISCHARGES low 2 low 2 low 2 PETROL STATION GC014C Petrol station, Meningie ACCIDENTAL SPILLAGE low 2 GC014L Petrol station, Meningie LEAKAGE low 2 GC085C Petrol station—Mobil ACCIDENTAL SPILLAGE low 2 GC085L Petrol station—Mobil LEAKAGE low 2 SLIPWAY GC087H Slipway, wooden boats WASH DOWN low 1 low 2 213
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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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