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 telemetry to enable automatic shut-off. Toilets/septic tank systems (eg Kingston caravan park, Gerard township, Berri public toilets) also pose a low risk in some locations. A large degree of uncertainty accompanied the above risk rankings because site-specific studies could not be referenced. Salinity Moderate salinity risks are present as a result of discharges from Yatco lagoon (Moorook off-take) and Cobdogla and Loveday swamps/evaporation basins (Barmera and Cobdogla township off-take), and Gerard horticultural area (Gerard off-take). Loveday and Cobdogla basins evaporate irrigation and regional groundwater drainage and are in close proximity to the river and off-take. The risk ranking was assigned from an unlikely (value of 1) likelihood ranking and moderate (value of 3) consequence ranking. Future artificial flushing strategies to restore the health of the associated wetlands would need to be closely monitored to minimise potential negative effects on the water supply. Salt inputs from several of the other larger horticultural areas, although not located in the raw water zones, are undoubtedly contributing to a higher overall risk to raw water supplies in this region. Several salt interception programs have been implemented to reduce potential future salt impacts on the raw water quality. It is expensive and difficult to remove salt in water treatment operations. Nutrients Moderate nutrient risks were assigned to discharge from Yatco lagoon (Moorook off-take), Gerard horticultural area, and potential discharge from Loveday and Cobdogla evaporation basins. There was some uncertainty to this assessment. Low risk hazards were assigned to stormwater discharge points in Berri and informal camping areas. Organic matter Moderate organic matter risks were assigned to potential discharges from Loveday and Cobdogla evaporation basins, Gerard horticultural area and stormwater discharge at in Berri (Crawford Terrace). Turbidity A moderate turbidity risk was assessed for the Crawford Terrace stormwater discharge 25 m upstream of the Berri raw water off-take. Highly turbid water can increase the cost of water treatment and potentially shield pathogens from treatment. Low turbidity risks included other stormwater discharge points, vessel launching areas, and Berri marina (shallow). Hydrocarbons Most hydrocarbon risks to raw water supplies were through stormwater discharge points in the Berri township, with the Crawford Terrace discharge receiving a moderate risk ranking. The Cobdogla causeway was also given a moderate risk ranking as in the unlikely event of a spill it is just downstream of the Cobdogla off-take. Low risk hazards included petrol stations, vessel mooring areas and boat ramps. Heavy metals A number of heavy metal risks to raw water supplies were found through stormwater discharge points in the Berri township, with the Crawford Terrace discharge receiving a moderate risk ranking. Low risk hazards included Berri marina and an informal camping area/old landfill downstream of Berri. 68
Table 3.4 Summary of risks to raw water supply environmental values, BB & LB LAP areas 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 certainty value (in italics) follows each risk ranking SA HY PE HM OR TU GEOCODE HAZARD EVENT TYPE PA NU DRAINAGE DISPOSAL SITE BL087B Evaporation basin, Loveday EVENT DISCHARGE mod 2 mod 2 low 1 mod 3 BL125B Evaporation basin, Cobdogla EVENT DISCHARGE mod 2 mod 2 low 1 mod 3 HORTICULTURE BL104L Horticulture, Gerard LEAKAGE mod 2 mod 2 low 1 mod 2 INFORMAL CAMPING BL031G Permanent camping / landfill, d/s of Berri HUMAN/ANIMAL EXCRETION low 3 low 2 low 2 low 3 low 3 BL048G Informal camping, d/s Thiele's sandbar HUMAN/ANIMAL EXCRETION low 3 low 3 low 2 BL078G Informal camping, adj Thurk Island HUMAN/ANIMAL EXCRETION low 3 low 3 low 2 BL093G Informal camping, Moorook game reserve HUMAN/ANIMAL EXCRETION mod 3 low 2 low 2 BL025Q MARINA DISCHARGES low 2 low 2 low 2 low 2 low 1 low 2 PETROL STATION BL032C Petrol station—Shell, Berri ACCIDENTAL SPILLAGE low 3 BL032L Petrol station—Shell, Berri LEAKAGE low 2 BL085C Petrol station, Cobdogla ACCIDENTAL SPILLAGE low 3 BL085L Petrol station, Cobdogla LEAKAGE low 2 BL146L Petrol station, Berri (disused) LEAKAGE low 2 BL177L Petrol station—BP, Loxton LEAKAGE low 2 BL030H Slipway, EPA Lic #1385—Berri WASH DOWN low 2 low 2 low 2 STORMWATER INFRASTRUCTURE BL027E Stormwater retention basin, Berri EVENT DISCHARGE low 2 low 2 low 2 low 2 low 2 low 2 BL155B Stormwater discharge, Crawford Tce, Berri EVENT DISCHARGE mod 2 low 3 mod 3 mod 3 mod 3 mod 3 BL156B Stormwater discharge, Vaughan Tce, Berri EVENT DISCHARGE low 2 low 3 low 3 low 3 low 3 low 3 BL157B Stormwater discharge, Ahern St, Berri EVENT DISCHARGE low 2 low 3 low 3 low 3 low 3 low 3 BL158B Stormwater discharge, Berri Oval EVENT DISCHARGE low 2 low 3 low 3 low 3 low 3 low 3 BL159B Stormwater discharge, Berri marina EVENT DISCHARGE low 2 low 3 low 3 low 3 low 3 low 3 TOILETS/SEPTIC TANKS 69
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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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Current and potential future option
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2 Renmark to border LAP area assessment - EPA - Sa.gov.au

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