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 5.4 is the key map for risks to raw water supply environmental value in the MM LAP area. The attached DVD has individual maps numbered according to the key map. 134 Note: only hazards identified in the shaded areas were assessed for risk to raw water supplies Figure 5.5 Key map for raw water supply zones, MM LAP area
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 5.3. Relatively few risks were identified to raw water supplies and most were rated as low level. No high or very high risks were identified. The highest frequency of risks was for pathogens, followed by nutrients, organic matter and hydrocarbon stressors. Table 5.3 Frequency of risks to raw water supplies, MM LAP area Stressor Risk PA NU TU OR HM PE HY SA Total Low 5 5 3 4 1 0 8 0 26 Mod 6 5 1 6 1 0 0 1 20 High 0 0 0 0 0 0 0 0 0 V.high 0 0 0 0 0 0 0 0 0 Total 11 10 4 10 2 0 8 1 46 PA—pathogens; NU—nutrients; TU—turbidity; OR—organic matter; HM—heavy metals; PE—pesticides; HY—hydrocarbons; SA—salinity Table 5.4 lists the raw water supply risks identified in this LAP area which are discussed in more detail below for each stressor. Pathogens Stormwater discharge in Swan Reach posed a moderate risk to the raw water supply as the off-take point is only about 25 m upstream of the stormwater discharge. There was no monitoring data to support this assessment but as Swan Reach township’s water supply is an unfiltered system, it warrants further investigation. Septic tanks in Swan Reach township also posed an aggregated moderate pathogen risk, as did riverside public toilets (Tenbury–Hunter Reserve) opposite the off-take. There was some uncertainty as to this assessment. Blanchetown, which is also on septic tanks, was assessed as part of the RW LAP area. Sources of moderate pathogen risk to the Swan Reach–Stockwell pipeline were popular recreation areas with no sanitation facilities adjacent to the off-take and at Cooinda, and the South Portee wetland upstream from the off-take. Swan Reach wetland complex was outside the formal raw water zone for Swan Reach township, but risks (in particular riparian grazing) warrant further examination. Low risk hazards included the river vessel waste disposal station in Swan Reach (on opposite side of river from the off-take) and houseboat moorings about 500 m downstream of the Swan Reach–Stockwell pipeline off-take. Nutrients Moderate nutrient hazards were similar to those described for pathogens above (septic tanks and stormwater discharge in Swan Reach, South Portee wetland, informal camping areas). There was low certainty for these assessments. Low risks included the Swan Reach river vessel wastewater disposal station. 135
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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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