D1.1.4 Ensure pumps have Inspection log. Water Re-fuel stand-by generators. transmission generators (if Inability to Electricity ceases. necessary). transmit Routine inspection and supply. water from maintenance of pipelines. Maintenance Clear source to and blockages/ plant, or inspection repair pump plant to not carried breakdowns out. or pipe storage failures. (including power failure). D1.1.5 out routine testing of Change in Change in Locate and fix storage for leaks. storage level. storage leak. Leakage does not from the equal water storage input minus facility. water output (including Event: INTRODUCTION OF CONTAMINATING MATERIAL INTO SERVICE RESERVOIR Possible hazards: Germs, arsenic, copper, chromium, iron, chlorine, aluminium. Level of risk: High1 D1.2.1 For in general: Inspection Unexplained Replace reports. change in damaged ensure the storage is Access by water screens, etc. covered Free available quality. chlorine Isolate tank, install mesh, grills, (FAC). Taste and chlorinate and vents, etc odour the undertake regular tank complaints. inspections quality. If Visual document condition of there is gross evidence of structure, mesh, grills, contamination, entry of vents, tank liner (for dump the animal or gaps) etc and take water, clean bird. action. and refill FAC before For wooden tanks: chlorinating. install metal band less than around wooden tanks 0.2 mg/L. to prevent access from ground level remove vegetation near tanks install internal liner for tank roof. Maintain an FAC residual. 1 The level of risk from microbiological contamination is less if a chlorine residual is maintained. Preventive measures Checking preventive measures Corrective action Causes What to check Signs that action is needed INTRODUCTION OF CONTAMINATING MATERIAL INTO SERVICE RESERVOIR cont’d
D1.1.4 Inability to transmit water from source to plant, or plant to storage (including power failure). Ensure pumps have stand-by generators. Routine inspection and maintenance of pipelines. Inspection log. Electricity supply. Water transmission ceases. Maintenance and inspection not carried out. Re-fuel generators (if necessary). Clear blockages/ repair pump breakdowns or pipe failures. D1.1.5 Leakage from the storage facility. out routine testing of storage for leaks. Change in storage level. Change in storage does not equal water input minus water output (including Locate and fix leak. Event: INTRODUCTION OF CONTAMINATING MATERIAL INTO SERVICE RESERVOIR Possible hazards: Germs, arsenic, copper, chromium, iron, chlorine, aluminium. Level of risk: High1 D1.2.1 Access by For in general: ensure the storage is covered install mesh, grills, vents, etc undertake regular tank inspections document condition of structure, mesh, grills, vents, tank liner (for gaps) etc and take action. For wooden tanks: install metal band around wooden tanks to prevent access from ground level remove vegetation near tanks install internal liner for tank roof. Maintain an FAC residual. Inspection reports. Free available chlorine (FAC). Unexplained change in water quality. Taste and odour complaints. Visual evidence of entry of animal or bird. FAC less than 0.2 mg/L. Replace damaged screens, etc. Isolate tank, chlorinate and the quality. If there is gross contamination, dump the water, clean and refill before chlorinating. 1 The level of risk from microbiological contamination is less if a chlorine residual is maintained. Causes Preventive measures Checking preventive measures Corrective action What to check Signs that action is needed INTRODUCTION OF CONTAMINATING MATERIAL INTO SERVICE RESERVOIR cont’d
distribution-post-treatment-storage-feb14-v2.docx