If an event happens despite preventive and corrective actions you have taken, you may need to consult with the Medical Officer of Health to assess how serious a problem is. Turbidity higher than maximum acceptable level Event – A turbidity of less than 0.2 NTU cannot be maintained in the water Indicators: leaving the treatment plant. Follow the actions given in Figure 3.4 of Required DWSNZ:2000. actions: Identify the reason for the failure and rectify. Record the reason for the failure and the steps taken to rectify. Modify the water safety plan if necessary. Manager designated responsible for water supply. Responsibility: Event Excessive levels of treatment chemicals carried into the distribution system – Consumer complaints of discoloration, poor sensation, Indicators: odour. Excessive chemical concentrations measured in the leaving the treatment plant or in the distribution system. Notification of error by operator or chemical delivery contractor. Follow Section 4.4 of Required DWSNZ:2000. actions: Identify the reason for the failure and rectify. Monitor chemical until it reaches acceptable limits. Record the reason for the failure and the steps taken to rectify. Modify the water safety plan if necessary. Manager designated responsible for water supply. Responsibility: Water Safety Plan Performance Assessment To make sure that your supply’s water safety plan (formerly known as a Public Health Risk Management Plan, PHRMP) is working properly, periodic checks are needed. The overview document outlines what needs to be done. The following table provides the detailed information for checking this particular supply element.
If an event happens despite preventive and corrective actions you have taken, you may need to consult with the Medical Officer of Health to assess how serious a problem is. Event – Turbidity higher than maximum acceptable level Indicators: A turbidity of less than 0.2 NTU cannot be maintained in the water leaving the treatment plant. Required actions: Follow the actions given in Figure 3.4 of DWSNZ:2000. Identify the reason for the failure and rectify. Record the reason for the failure and the steps taken to rectify. Modify the water safety plan if necessary. Responsibility: Manager designated responsible for water supply. Event – Excessive levels of treatment chemicals carried into the distribution system Indicators: Consumer complaints of discoloration, poor sensation, odour. Excessive chemical concentrations measured in the leaving the treatment plant or in the distribution system. Notification of error by operator or chemical delivery contractor. Required actions: Follow Section 4.4 of DWSNZ:2000. Identify the reason for the failure and rectify. Monitor chemical until it reaches acceptable limits. Record the reason for the failure and the steps taken to rectify. Modify the water safety plan if necessary. Responsibility: Manager designated responsible for water supply. Water Safety Plan Performance Assessment To make sure that your supply’s water safety plan (formerly known as a Public Health Risk Management Plan, PHRMP) is working properly, periodic checks are needed. The overview document outlines what needs to be done. The following table provides the detailed information for checking this particular supply element.
treatment-dissolved-air-flotation-feb14-v2.docx