Table 5.17 (continued) ecological long- lasting ecosystems or value, establish pesticides surface water systems and criteria (eg receiving purge water antibiotic groundwater level Operate the system to avoid • Preventive substances to inducing increased hazard range, maximum rate measures benign levels concentrations via increased of change of for the discharge of groundwater into the groundwater level, species ecosystem concentration range present in the Move site to increase separation or of pertinent • ecosystem, from groundwater-dependent constituents) for one simplified and in any ecosystems; ensure attenuation or more relevant biological zone excludes groundwater- observation wells, treatment dependent ecosystems and evaluate Site • systems in monitoring results selection Adjust recharge and recovery rates • use obtained during the as above (and number or type of wells) so Reduce trial • that hydraulic head variations in groundwater-dependent ecosystems meet acceptance and metals criteria above and turbidity Residual risk to residual assessment (operational) risk levels, As for precommissioning • where residual risk assessment they Further reduce concentrations • impact of water-quality Reduce • on hazards of For ecosystems with high • studies or Validation validation monitoring monitoring of abundance and biodiversity of species at locations and frequencies relevant to the ecosystems, and of the potential impacts of managed aquifer • recharge (including those on stygofauna, if relevant) f c t i
Table 5.17 (continued) Preventive measures or simplified • Site selection as above and residual risk • Reduce of long- lasting pesticides and antibiotic substances to benign levels for the species present in the ecosystem, and in any biological treatment systems in use • Reduce metals and turbidity to levels, where they impact on ecosystems or surface water systems receiving purge water • Operate the system to avoid inducing increased hazard concentrations via increased discharge of groundwater into the ecosystem • Move site to increase separation from groundwater-dependent ecosystems; ensure attenuation zone excludes groundwater- dependent ecosystems • Adjust recharge and recovery rates (and number or type of wells) so that hydraulic head variations in groundwater-dependent ecosystems meet acceptance criteria above Residual risk assessment (operational) • As for precommissioning residual risk assessment • Further reduce concentrations of water-quality hazards • For ecosystems with high ecological value, establish criteria (eg groundwater level range, maximum rate of change of groundwater level, concentration range of pertinent constituents) for one or more relevant observation wells, and evaluate monitoring results obtained during the trial Validation monitoring • studies or validation monitoring of abundance and biodiversity of species at locations and frequencies relevant to the ecosystems, and of the potential impacts of managed aquifer recharge (including those on stygofauna, if relevant) c f t i
water-recycling-guidelines-mar-24.docx