3 Survey and Sampling

3.1	General principles
		3.1.1	Survey of water systems
		3.1.2	Summary of the components of risk assessment
		3.1.3	Selection of Sampling Points
		3.1.4	Timing of sampling
		3.1.5	Containers
		3.1.6	Neutralisation of Biocides
		3.1.7	Temperature Measurement
		3.1.8	Aseptic Precautions During Sampling
		3.1.9	Definitions
		3.1.10	Collection of Pre-flush Samples
		3.1.11	Collection of Post-flush Samples - Disinfection of Sampling Points
		3.1.12	Biofilm Samples
		3.1.13	Sample Transport and Storage
		3.1.14	Type of Sample
3.2	Equipment
3.3	Sampling for Routine Monitoring of Legionella
		3.3.1	General Comments
		3.3.2	Safety
		3.3.3	Domestic Cold Water Systems
		3.3.4	Domestic Hot Water Systems
		3.3.5	Evaporative Cooling Systems
		3.3.6	Spa Pools
		3.3.7	Other Sources
3.4	Sampling for Outbreak Investigations
		3.4.1	General comments
		3.4.2	Safety
		3.4.3	Domestic Cold Water Systems
		3.4.4	Domestic Hot Water Systems
		3.4.5	Evaporative cooling systems
		3.4.6	Spa pools
		3.4.7	Other sources
3.5	Sampling for risk assessment and the investigation of problems

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