Table 5.17 Criteria, controls and monitoring for groundwater-dependent ecosystem protection in relation to the stages of risk assessment dependent Aquifer unlikely to contain • stygofauna (ie aquifer is anaerobic ecosystems or has no macropores) are within historical Acceptance range or Residual risk criteria closer to assessment (operational) historical range than Confirmation of achievement of • they would or precommissioning residual risk be without simplified assessment criteria, based on the project, additional field and laboratory or that heads measurements and modelling do not fall Avoids Modelling and data from trials, • • below recharge including minimum in close groundwater geochemical levels for proximity monitoring, or ecotoxicological ecosystem to studies reveal no adverse maintenance, sensitive effects on aquifer ecosystems, and rates of connected water bodies or decline are groundwater- dependent within those ecosystems determined acceptable for the vegetation present Avoids • Modelling • shows that mass and aquifer with of shallow nutrients watertable and for recharge and discharged recovery to of water ecosystems are within Maximal the and acceptable range for indicator residual species risk present, and receiving waters remain • within the water- shows quality that criteria for hydraulic the relevant head ecosystem (ANZECC- in 2000a)
Table 5.17 Criteria, controls and monitoring for groundwater-dependent ecosystem protection in relation to the stages of risk assessment Acceptance criteria or simplified • Avoids recharge in close proximity to sensitive • Avoids aquifer with shallow watertable for recharge and recovery of water Maximal and residual risk • shows that hydraulic head in dependent ecosystems are within historical range or closer to historical range than they would be without the project, or that heads do not fall below minimum levels for ecosystem maintenance, and rates of decline are within those determined acceptable for the vegetation present • Modelling shows that mass and of nutrients and discharged to ecosystems are within the acceptable range for indicator species present, and receiving waters remain within the water- quality criteria for the relevant ecosystem (ANZECC- 2000a) • Aquifer unlikely to contain stygofauna (ie aquifer is anaerobic or has no macropores) Residual risk assessment (operational) • Confirmation of achievement of precommissioning residual risk assessment criteria, based on additional field and laboratory measurements and modelling • Modelling and data from trials, including groundwater geochemical monitoring, or ecotoxicological studies reveal no adverse effects on aquifer ecosystems, connected water bodies or groundwater- dependent ecosystems
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