Causes Preventive measures Checking preventive measures Corrective action What to check Signs that action is needed Event: DISSOLUTION OF CHEMICALS FROM CONSTRUCTION MATERIALS1 cont D2.1.1.4 Ensure materials Suppliers Change materials. are resistant to certificate of Materials Routine dissolution by the performance and insufficiently cleaning/flushing water and the quality. resistant to surrounding dissolution by Metals, organics, environment. the water and asbestos the associated with surrounding dissolution of environment. materials. Ensure the Metals, organics, Adjust treatment treatment of asbestos water minimises associated with its ability to dissolution of dissolve materials. materials it contacts. Event: GERMS ENTER THE DISTRIBUTION SYSTEM THROUGH FAILED CONSTRUCTION MATERIALS Possible hazards: Germs Level of risk: Low moderate3 – D2.1.2.1 Develop a routine Maintenance log. E.coli detected maintenance in 100 ml Deterioration Microbiological schedule sample In of distribution quality. including treated water. system, inspection of leading to Increased distribution ingress of illness in system condition. community. Develop a Replace Burst pipes. programme of deteriorating pipes High replacement of and fittings. unaccounted deteriorating for water use. pipes and fittings. Ensure materials Suppliers Change materials. are resistant to certificate of the dissolution performance and properties of the quality. water or environment. D2.1.2.2 Develop a routine Maintenance log. Elevated Incident-reactive maintenance heterotrophic cleaning/flushing Biofilm Heterotrophic schedule for plate count. development plate count. distribution sustaining Consumer system E.coli. pathogens. complaints. cleaning/flushing. Low free Ensure materials Suppliers Routine available are: certificate of cleaning/flushing chlorine (FAC). performance and resistant to quality. biofilm development (smooth surfaces make it difficult for to adhere) do not promote biofilm development (some plastics do) Notes:
Causes Preventive measures Checking preventive measures Corrective action What to check Signs that action is needed Event: DISSOLUTION OF CHEMICALS FROM CONSTRUCTION MATERIALS1 cont D2.1.1.4 Materials insufficiently resistant to dissolution by the water and the surrounding environment. Ensure materials are resistant to dissolution by the water and the surrounding environment. Suppliers certificate of performance and quality. Metals, organics, asbestos associated with dissolution of materials. Change materials. Routine cleaning/flushing Ensure the treatment of water minimises its ability to dissolve materials it contacts. Metals, organics, asbestos associated with dissolution of materials. Adjust treatment Event: GERMS ENTER THE DISTRIBUTION SYSTEM THROUGH FAILED CONSTRUCTION MATERIALS Possible hazards: Germs Level of risk: Low – moderate3 D2.1.2.1 Deterioration of distribution system, leading to ingress of Develop a routine maintenance schedule including inspection of distribution system condition. Maintenance log. Microbiological quality. E.coli detected in 100 ml sample In treated water. Increased illness in community. Burst pipes. High unaccounted for water use. Develop a programme of replacement of deteriorating pipes and fittings. Replace deteriorating pipes and fittings. Ensure materials are resistant to the dissolution properties of the water or environment. Suppliers certificate of performance and quality. Change materials. D2.1.2.2 Biofilm development sustaining pathogens. Develop a routine maintenance schedule for distribution system cleaning/flushing. Maintenance log. Heterotrophic plate count. E.coli. Elevated heterotrophic plate count. Consumer complaints. Low free available chlorine (FAC). Incident-reactive cleaning/flushing Ensure materials are: resistant to biofilm development (smooth surfaces make it difficult for to adhere) do not promote biofilm development (some plastics do) Suppliers certificate of performance and quality. Routine cleaning/flushing Notes:
distribution-construction-materials-feb14-v2.docx