D2.3.1.6 Internal and On-site checklist Inadequate Identify staff external training of resources staff training Inadequate staff provided to ensure and training supervision by needs and training. that crews are records. qualified provide aware of quality personnel. training. issues and the Inadequate importance of good resources/ work practices. training records. D2.3.1.7 Only certified or Record of Non-approved Replace with approved materials materials materials used items of Inappropriate used (see Appendix requirements. in the suitable materials used. Guide D2.1). distribution quality. Certification of system. materials used. Records of materials in use inadequate. Event: INTRODUCTION OF CONTAMINATING MATERIAL INTO THE DISTRIBUTION SYSTEM cont’d D2.3.1.8 Develop and use a Free available No Notify the code of practice for chlorine (FAC) MOH if there Inadequate the cleaning and concentration. of flow are more flushing and disinfection of direction (see than 10 E. disinfection Microbiological mains (see Appendix Appendix 2). coli in a practices during quality. 2). 100 ml repairs or Excessive Turbidity. sample, or if commissioning Ensure there is a customer E. coli of new mains. chlorine residual complaints, or upstream and suspected persists. downstream of linked repair/ illnesses. Identify commissioning site. reasons for FAC residual inadequate Maintain a cannot be residual and disinfectant maintained at correct. residual. more than 0.2 mg/L after cleaning, disinfection and flushing of the affected area. FAC in affected section not maintained at more than 10 mg/L for 30 minutes. E. coli or coliforms detected in 100 ml sample. Turbidity more than 0.5 NTU.
D2.3.1.6 Inadequate staff training. Internal and external training provided to ensure that crews are aware of quality issues and the importance of good work practices. On-site checklist of resources and training records. Inadequate staff supervision by qualified personnel. Inadequate resources/ training records. Identify staff training needs and provide training. D2.3.1.7 Inappropriate materials used. Only certified or approved materials used (see Appendix Guide D2.1). Record of materials requirements. Certification of materials used. Non-approved materials used in the distribution system. Records of materials in use inadequate. Replace with items of suitable quality. Event: INTRODUCTION OF CONTAMINATING MATERIAL INTO THE DISTRIBUTION SYSTEM cont’d D2.3.1.8 Inadequate flushing and disinfection practices during repairs or commissioning of new mains. Develop and use a code of practice for the cleaning and disinfection of mains (see Appendix 2). Ensure there is a chlorine residual upstream and downstream of repair/ commissioning site. Maintain a disinfectant residual. Free available chlorine (FAC) concentration. Microbiological quality. Turbidity. No of flow direction (see Appendix 2). Excessive customer complaints, or suspected linked illnesses. FAC residual cannot be maintained at more than 0.2 mg/L after cleaning, disinfection and flushing of the affected area. FAC in affected section not maintained at more than 10 mg/L for 30 minutes. E. coli or coliforms detected in 100 ml sample. Turbidity more than 0.5 NTU. Notify the MOH if there are more than 10 E. coli in a 100 ml sample, or if E. coli persists. Identify reasons for inadequate residual and correct.
distribution-operation-feb14-v2.docx