Sample Type

From the help published with Drinking Water Watch 3.5, reproduced as delivered.

Sample Type may be one types listed in the following chart. Sample schedules may only be for routine, repeat or confirmation samples.

Sample Type
RT	Routine	Routine samples are typically collected for compliance with monitoring rules and used in maximum contaminant level (MCL) compliance calculations.
RP	Repeat	Repeat samples are collected when a routine sample exceeds trigger, action, or maximum contaminant levels. Additional sampling is required to further identify and define potential water quality problems.
CO	Confirmation	Confirmation samples are taken at the same location as a previous sample analytical result for confirmation purposes. These samples are sometimes referred to as check samples.
MR	Maximum Residence Time	Maximum Residence Time samples measure trihalomethanes and haloacetic acids present in a water system's distribution system. These samples are collected at a point representing the longest time between treatment, storage, and use. Formation of trihalomethanes and haloacetic acids over time results from disinfectant residual, organic content, and residence time.
BB	Batch Blanks	Several types of blank samples are used for quality control of laboratory processes.
DU	Duplicate	Duplicate samples are used for quality control of the sample collection or laboratory analysis processes. They are often collected to document an enforcement case. Samples are collected simultaneously by the regulatory agency and the water system in separate bottles. Results are compared to determine if any potential problems exist with the sample collection or analysis procedures.
FB	Field Blanks	Several types of blank samples are used for quality control of laboratory processes.
PE	Performance Evaluation	Performance evaluation samples are used for quality control of laboratory processes. The labs receive samples for analysis from the U.S. Environmental Protection Agency or other certifying agency. Results are compared against standards to determine if labs follow accurate and consistent analysis procedures.
SB	Shipping Blanks	Several types of blank samples are used for quality control of laboratory processes.
SL	Split	Split samples are used for quality control of the sample collection or laboratory analysis processes. They are often collected to document an enforcement case. A sample is collected by the regulatory agency or the water system and split in two bottles. Results are compared to determine if any potential problems exist with the laboratory analysis procedures.
SP	Special	Special samples are usually collected for reasons other than compliance determination and are typically used for process control or quality checks following maintenance or new construction in the treatment or distribution system.
ST	Split Blanks	Several types of blank samples are used for quality control of laboratory processes.

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