P1.4.3.1 Identify potential No survey of Add treatment sources of quality. potential processes to Contamination contamination when sources of remove sources (eg, Chemicals that source is contamination identified septic the potential selected (see Guide undertaken. contaminants. tanks, contamination S1.1). chemical source is likely No aquifer tests Instigate sources) in Monitor changes in to produce. carried out. system for aquifer land use (including gathering No system in recharge urban information place for zone. developments) and land use obtaining the potential for changes. information contamination they about changing create, once the land use. source is in use. Restrict activities in the aquifer recharge zone that may contaminate the water (see S1 Guide series). Gather information about the vulnerability of the aquifer before undertaking development. Event: TOO LITTLE WATER CAN BE DRAWN FROM THE SPRING TO MEET DEMAND Possible hazards: Germs and chemicals that get into the water because of low system pressure; hazards associated with poor hygiene. Level of risk: High1 P1.4.4.1 Regular inspection Flow (from Reduced flow. Modify intake. and cleaning of intake). Screens Biological screens should damaged or growths on be intensified clogged with screens. during times of flood organic (sediment) and matter. under low flow conditions (algae, weed slimes). P1.4.4.2 Regular programme Flow (from Reduced flow. Change of inspection of intake). screen pore or Screens Scale build-up screens. This slot size. clogged with on leaking should be iron or calcium couplings, pipe intensified during deposits. joints etc. times of low flow conditions. P1.4.4.3 Regular programme Flow (from Reduced flow. Investigate of inspection and intake). covering the Intake and Vegetation cleaning of dam seepage area. screen floating in the with increased clogged with water. frequency during debris – autumn. common problem with Ensure there is no coffer dam vegetation type intakes. overhanging the dam.
P1.4.3.1 Contamination sources (eg, septic tanks, chemical sources) in aquifer recharge zone. Identify potential sources of contamination when source is selected (see Guide S1.1). Monitor changes in land use (including urban developments) and the potential for contamination they create, once the source is in use. Restrict activities in the aquifer recharge zone that may contaminate the water (see S1 Guide series). Gather information about the vulnerability of the aquifer before undertaking development. quality. Chemicals that the potential contamination source is likely to produce. No survey of potential sources of contamination undertaken. No aquifer tests carried out. No system in place for obtaining information about changing land use. Add treatment processes to remove identified contaminants. Instigate system for gathering information land use changes. Event: TOO LITTLE WATER CAN BE DRAWN FROM THE SPRING TO MEET DEMAND Possible hazards: Germs and chemicals that get into the water because of low system pressure; hazards associated with poor hygiene. Level of risk: High1 P1.4.4.1 Screens damaged or clogged with organic matter. Regular inspection and cleaning of screens should be intensified during times of flood (sediment) and under low flow conditions (algae, weed slimes). Flow (from intake). Reduced flow. Biological growths on screens. Modify intake. P1.4.4.2 Screens clogged with iron or calcium deposits. Regular programme of inspection of screens. This should be intensified during times of low flow conditions. Flow (from intake). Reduced flow. Scale build-up on leaking couplings, pipe joints etc. Change screen pore or slot size. P1.4.4.3 Intake and screen clogged with debris – common problem with coffer dam type intakes. Regular programme of inspection and cleaning of dam with increased frequency during autumn. Ensure there is no vegetation overhanging the dam. Flow (from intake). Reduced flow. Vegetation floating in the water. Investigate covering the seepage area.
treatment-springs-feb14-v2.docx