Reliable information about water quality is essential for the proper management of a water supply. Knowledgeable and skilled staff are also essential for minimising the public health risks associated with water supplies. Please read the staff training (Guide and the G1) monitoring guides (Guide While we haven’t pointed out every detail of how these G2). documents are linked with the present document, the links are many and are important. Abbreviations: Drinking-Water Standards for New Zealand; MAV Maximum acceptable value see – – – DWSNZ; NZDS New Zealand Drilling Standard. – Preventive measures Checking preventive measures Corrective action Causes What to check Signs that action is needed Event: NOT ENOUGH SOURCE WATER AVAILABLE FOR ABSTRACTION Hazards: Germs and chemicals that get into the water because of low system pressure; hazards associated with poor hygiene. Level of risk: High P1.3.1.1 Start water demand. Drop in system Prepare new conservation pressure. resource Drought. Source usage measures as soon as consent rate. Customer water shortage application. complaints System becomes likely. about low Find new pressure. Plan the development pressure. sources. and use of the water Increase source, and the need storage to identify and capacity. develop new sources, Partially close based on the safe valves through yield of the bore/well. the network to equalise pressures. P1.3.1.2 Negotiate new Water Drop in system Find new resource consents demand. pressure. sources. Resource and sink more consent Source usage Customer Increase bores/wells. limitations. rate. complaints storage about low capacity. System pressure. pressure. CONTAMINATION OF BORE/WELL DURING CONSTRUCTION Possible hazards: Germs and chemical determinands (eg, barium). Level of risk: Low P1.3.2.1 Ensure that drills are Development of Disinfect cleaned and nuisance bore/well. disinfected before organisms such Flush bore/ drilling starts. as iron bacteria. by drilling well. equipment. Follow requirements Evidence of Use a of the NZDS. NZDS not having different been followed. contractor. Event: CONTAMINATION OF BORE/WELL DURING CONSTRUCTION cont’d
Reliable information about water quality is essential for the proper management of a water supply. Knowledgeable and skilled staff are also essential for minimising the public health risks associated with water supplies. Please read the staff training (Guide G1) and the monitoring guides (Guide G2). While we haven’t pointed out every detail of how these documents are linked with the present document, the links are many and are important. Abbreviations: – Drinking-Water Standards for New Zealand; MAV – Maximum acceptable value – see DWSNZ; NZDS – New Zealand Drilling Standard. Causes Preventive measures Checking preventive measures Corrective action What to check Signs that action is needed Event: NOT ENOUGH SOURCE WATER AVAILABLE FOR ABSTRACTION Hazards: Germs and chemicals that get into the water because of low system pressure; hazards associated with poor hygiene. Level of risk: High P1.3.1.1 Drought. Start water conservation measures as soon as water shortage becomes likely. Plan the development and use of the water source, and the need to identify and develop new sources, based on the safe yield of the bore/well. demand. Source usage rate. System pressure. Drop in system pressure. Customer complaints about low pressure. Prepare new resource consent application. Find new sources. Increase storage capacity. Partially close valves through the network to equalise pressures. P1.3.1.2 Resource consent limitations. Negotiate new resource consents and sink more bores/wells. Water demand. Source usage rate. System pressure. Drop in system pressure. Customer complaints about low pressure. Find new sources. Increase storage capacity. CONTAMINATION OF BORE/WELL DURING CONSTRUCTION Possible hazards: Germs and chemical determinands (eg, barium). Level of risk: Low P1.3.2.1 by drilling equipment. Ensure that drills are cleaned and disinfected before drilling starts. Follow requirements of the NZDS. Development of nuisance organisms such as iron bacteria. Evidence of NZDS not having been followed. Disinfect bore/well. Flush bore/ well. Use a different contractor. Event: CONTAMINATION OF BORE/WELL DURING CONSTRUCTION cont’d
treatment-bores-and-wells-feb14-v2.docx