animal or bird For tanks: ingress. ensure the storage is covered storage. install mesh, grills, Replace vents, etc damaged screens, etc. undertake regular tank inspections Instigate document condition of inspections. 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 Prune or remove vegetation remove near trees. install internal liner for tank roof. P3.2.2 Locked perimeter fence. Site inspection Evidence of Determine and or how access Locked access towers reports. damage. was access, and ladders. obtained and vandalism, Locked hatches on tanks. rectify or sabotage. shortcoming Intruder alarm. in security. Produce site inspection plans and reports. P3.2.3 Specify materials Regular Deterioration Replace certified for potable inspection of of water substandard Leaching water use in tenders, and tanks. quality materials. from, or audit during construction, following new corrosion of, If roof is Replace lid and during subsequent installation. construction unlined with more – maintenance, against materials. copper, Deterioration suitable changes in standards. chromium, or of water material. Use accredited arsenic quality after contractors. (especially rain. heavy For tanks using treated rain). timber, install roof liner. of copper, chromium or arsenic are more than 50% of their MAV. Event: INTRODUCTION OF CONTAMINATING MATERIAL INTO TANK OR RESERVOIR cont’d P3.2.4 Specify and audit roof Installation Deterioration Repair leaky design: design. of water joints, Entry of roof quality cracks, or to drain from (not into) drainage. Annual roof following rain. hatches tank inspection. promptly. restrict access to roof top.
animal or bird ingress. For tanks: ensure the storage is covered install mesh, grills, vents, etc undertake regular tank inspections document condition of mesh, grills, vents, tank liner (for gaps) etc and take action. storage. Replace damaged screens, etc. Instigate inspections. For wooden tanks: install metal band around wooden tanks to prevent access from ground level remove vegetation near install internal liner for tank roof. Prune or remove trees. P3.2.2 access, vandalism, or sabotage. Locked perimeter fence. Locked access towers and ladders. Locked hatches on tanks. Intruder alarm. Produce site inspection plans and reports. Site inspection and reports. Evidence of or damage. Determine how access was obtained and rectify shortcoming in security. P3.2.3 Leaching from, or corrosion of, construction materials. Specify materials certified for potable water use in tenders, and audit during construction, and during subsequent maintenance, against changes in standards. Use accredited contractors. For tanks using treated timber, install roof liner. Regular inspection of tanks. If roof is unlined – copper, chromium, or arsenic (especially heavy rain). Deterioration of water quality following new installation. Deterioration of water quality after rain. of copper, chromium or arsenic are more than 50% of their MAV. Replace substandard materials. Replace lid with more suitable material. Event: INTRODUCTION OF CONTAMINATING MATERIAL INTO TANK OR RESERVOIR cont’d P3.2.4 Entry of roof drainage. Specify and audit roof design: to drain from (not into) tank restrict access to roof top. Installation design. Annual roof inspection. Deterioration of water quality following rain. Repair leaky joints, cracks, or hatches promptly.
treatment-pretreatment-storage-feb14-v2.docx