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 Table 1.1 Stressors and their potential effect on environmental values* 18 Stressor Environmental value Salinity (SA) Can decrease species diversity and health Pathogens (PA) eg E coli, Giardia, Cryptosporidium Nutrients (NU) eg phosphorus and nitrogen compounds Turbidity (TU) ✝ suspended solids Heavy metals (HM) eg arsenic, lead, zinc, copper Natural and other biodegradable organic matter (OR) eg oils, leaves, hair, dissolved organic carbon Hydrocarbons (HY) eg fuels, diesel Pesticides (PE) eg insecticides, fungicides Aquatic ecosystem Raw water supply Recreational use Predominantly water taste implication Not applicable Potential health Contributes to algal growth/blooms that can lead to reduced DO levels and fish kills; ammonia can be toxic to biota Changes optical properties, affects photosynthesis, smothers habitats Potential toxicant; may bioaccumulate in some species Breakdown leads to reduction in DO which can result in fish kills; breakdown may also release nutrients and subsequently increase algal growth Toxic; affects surfacedwelling organisms Toxic; may bioaccumulate implications Contributes to algal growth/blooms which can cause taste and odour issues; nitrate may be toxic at high levels (>10 mg/L) Increases cost of water treatment (filtration, coagulation) Potential health implications for certain metals (eg arsenic) Increases cost of treatment, increases chlorine demand, responsible for byproduct formation during disinfection Health and treatment system implications Not applicable Potential health implications Contributes to algal growth/blooms, which can be toxic and a skin irritant, and can affect visual clarity of the water Changes optical properties, limits visual clarity Health implications from skin contact at high concentrations Aesthetics at high concentrations Health implications, aesthetics Health implications Health implications from skin contact at high concentrations * Shaded cells are stressors considered as part of the risk assessment for a particular environmental value; other stressors not applicable (would not affect a particular environmental value) or not considered to occur or be applicable in current project ✝ Assessment of turbidity includes suspended solids (SS) within the water column; loss of clarity within the column caused by larger-sized SS particles is temporary as they settle out DO—dissolved oxygen
River Murray and Lower Lakes catchment risk assessment for water quality: Results and management options Hazards are displayed on a separate series of maps for each environmental value (aquatic ecosystem, raw water, and recreation and aesthetics). Each hazard has a unique 'GEOCODE' (a descriptive reference code) denoting the relevant LAP region, unique hazard number and event type code. For example, MW00171B describes an event discharge (Event Type B) from hazard number 171 in the Mannum to Wellington (MW) LAP area. Map representation of hazards and their corresponding water quality risks is shown in the example below. Each column represents a different water quality stressor and the height of the column denotes the level of risk (see key) STRESSORS NUTRIENTS TURBIDITY ORGANICS HEAVY METALS PESTICIDES HYDROCARBONS SALINITY VERY HIGH HIGH MODERATE LOW LEVEL OF RISK Figure 1.2 Guidelines for interpreting maps (on attached DVD) GEOCODE Symbol for hazard type 19
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Page 4 and 5: The River Murray and Lower Lakes ca
Page 6 and 7: 6 Mannum to Wellington LAP area ass
Page 8 and 9: Table 6.5 Frequency of risk to recr
Page 10 and 11: Figure 7.2 Example of hazard to wat
Page 12 and 13: Roz Becker, Riverland Tourism Assoc
Page 14 and 15: Abbreviations 10 ADWG Australian Dr
Page 17: Executive Summary The River Murray
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River Murray and Lower Lakes catchm
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