The soil metal concentration trigger values in Tables A4.3 and A4.4 are the soil ecological investigation levels from NEPC (1999). These levels are lower, and hence more conservative, than the cumulative contaminant loading from ANZECC–ARMCANZ (2000a) when converted to milligrams per kilogram, based on an assumed soil accumulation zone depth of 75 mm and a soil bulk density of 1333 kg/m3 (EPA NSW 1997). All control points, preventive measures, target criteria, critical limits, critical control points, and their verification are site and scheme specific. Table A4.3 Copper: preventive measures for roofwater irrigation Control points Preventive measures Target criteria Verification monitoring shows soil Source copper levels are below water target criteria. No copper roofing material. Irrigation or watering Median copper concentration in soil should Roof be less than condition 100 mg/kg. management Avoid Not applicable. using from Soil copper copper concentrations are below roofs. critical limit for plants likely to be irrigated by Irrigation open-space irrigation. tools Irrigation rates should be less than 300 mm/year. Limit irrigation using roofwater to 10 years unless
The soil metal concentration trigger values in Tables A4.3 and A4.4 are the soil ecological investigation levels from NEPC (1999). These levels are lower, and hence more conservative, than the cumulative contaminant loading from ANZECC–ARMCANZ (2000a) when converted to milligrams per kilogram, based on an assumed soil accumulation zone depth of 75 mm and a soil bulk density of 1333 kg/m3 (EPA NSW 1997). All control points, preventive measures, target criteria, critical limits, critical control points, and their verification are site and scheme specific. Table A4.3 Copper: preventive measures for roofwater irrigation Control points Preventive measures Target criteria Verification Source water Irrigation or watering Roof condition management Avoid using from copper roofs. Irrigation tools Irrigation rates should be less than 300 mm/year. Limit irrigation using roofwater to 10 years unless monitoring shows soil copper levels are below target criteria. No copper roofing material. Median copper concentration in soil should be less than 100 mg/kg. Not applicable. Soil copper concentrations are below critical limit for plants likely to be irrigated by open-space irrigation.
water-recycling-guidelines-stormwater-23.docx