P3.1.1 Provide sufficient raw Pre-treatment Raw water Construct water storage to cover storage levels. storage levels additional Inadequate seasonal variations in unacceptably storage. raw water Water source water availability, low. supply. consumption. periods of untreatable Need for raw water quality, water-use maximum limits on restrictions. consent for abstraction No back-up from the source, and water source losses through available. evaporation. Refer also to Guide S1.1 (Contingency Plan Plan). development Develop alternative of new sources that can be used sources. when demand cannot be Water use met. restrictions. Encourage water conservation during periods when demand is likely to be high. P3.1.2 See Guides P2 and P10. Inability to transmit water from source to storage. P3.1.3 Carry out routine testing Change in Change in Fix leak. of storage for leaks. storage level. storage level Leak in does not equal treatment water input storage. minus water output (including evaporation). Event: INTRODUCTION OF CONTAMINATING MATERIAL INTO TANK OR RESERVOIR Possible hazards: Germs, arsenic, copper, chromium, iron; other health-significant determinands depending on the contaminant that has entered the water. Level of risk: Moderate P3.2.1 Produce site inspection Erect Site fence. inspection plans and reports plans and Access by reports. humans (see For lakes/open also P3.2.2), reservoirs: animals or ensure the storage is birds. fenced restrict recreational use around and on lake/ reservoir.
P3.1.1 Inadequate raw water supply. Provide sufficient raw water storage to cover seasonal variations in source water availability, periods of untreatable raw water quality, maximum limits on consent for abstraction from the source, and losses through evaporation. Refer also to Guide S1.1 (Contingency Plan). Develop alternative sources that can be used when demand cannot be met. Encourage water conservation during periods when demand is likely to be high. Pre-treatment storage levels. Water consumption. Raw water storage levels unacceptably low. Need for water-use restrictions. No back-up water source available. Construct additional storage. Plan development of new sources. Water use restrictions. P3.1.2 Inability to transmit water from source to storage. See Guides P2 and P10. P3.1.3 Leak in storage. Carry out routine testing of storage for leaks. Change in storage level. Change in storage level does not equal water input minus water output (including evaporation). Fix leak. Event: INTRODUCTION OF CONTAMINATING MATERIAL INTO TANK OR RESERVOIR Possible hazards: Germs, arsenic, copper, chromium, iron; other health-significant determinands depending on the contaminant that has entered the water. Level of risk: Moderate P3.2.1 Access by humans (see also P3.2.2), animals or birds. Produce site inspection plans and reports For lakes/open reservoirs: ensure the storage is fenced restrict recreational use around and on lake/ reservoir. Site inspection plans and reports. Erect fence. treatment
treatment-pretreatment-storage-feb14-v2.docx