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 Risks to raw water supplies Figure 3.4 is the key map for risks to the raw water supply environmental value in the BB & LB LAP areas. The attached DVD has individual maps numbered according to the key map. 66 Note: only hazards identified in shaded areas were assessed for risk to raw water supplies Figure 3.5 Key map for raw water supply zones, BB & LB LAP areas
River Murray and Lower Lakes catchment risk assessment for water quality: Results and management options The frequencies of identified risks to raw water supplies for the various water quality parameters are summarised in Table 3.3. The highest frequency of risks was for nutrients and pathogens, followed by organic matter, hydrocarbons and turbidity. Of the risks, 14 were rated as moderate with the remaining 133 classified as low level. No high or very high risks were identified. Table 3.3 Frequency of risks to raw water supplies, BB & LB LAP areas Stressor Risk PA NU TU OR HM PE HY SA Total Low 27 28 13 25 8 5 25 2 133 Moderate 3 3 0 4 1 0 1 2 14 High 0 0 0 0 0 0 0 0 0 Very high 0 0 0 0 0 0 0 0 0 Total 30 31 13 29 9 5 26 4 147 PA—pathogens; NU—nutrients; TU—turbidity; OR—organic matter; HM—heavy metals; PE—pesticides; HY—hydrocarbons; SA—salinity The raw water supply risks identified in the BB & LB LAP areas are listed in Table 3.4 and discussed in more detail below for each stressor. Pathogens A moderate-level risk was due to a stormwater discharge point (Crawford Terrace) in Berri, which is situated only 25 m upstream of the raw water off-take. Currently most Berri stormwater is diverted to a retention lagoon. However, in a large storm event a significant amount of water could discharge from this point and present a risk to the water treatment plant. Other stormwater outlets were assessed as low risk. The wastewater pond for back flushed water from the filtration plant in Berri was given a moderate risk ranking due to its proximity to the off-take. Major infrastructure failure would have to occur for this risk to eventuate. The only other moderate risk identified was for informal camping areas at Moorook game reserve which extend over a kilometre upstream and downstream of the off-take. Other popular recreation areas with no sanitation facilities (eg Thurk Island, Thiele’s sandbar) were given a low risk ranking. Other low-risk sources included vessel/houseboat waste disposal at houseboat moorings (eg Berri, Moorook, Kingston-on-Murray townships) and at Berri marina. The three river vessel waste disposal stations in the area (Berri, Loxton and Lock 3) make the likelihood low of blackwater being discharged from vessels and reaching the off-take points. Other sources of low pathogen risk were wastewater infrastructure systems for townships (eg Gerard, Loxton, Berri effluent pump stations). Many of Berri’s effluent pumps are due to be upgraded to 67
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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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