SOP for Estabilishment of Alert and Action Limit

Standard operating procedure for Establishment of Alert and Action Limit

1.0     
Purpose:



To lay down guidelines for establishment of alert and action limit for total viable counts performed during water analysis and for environmental monitoring.


2.0      
Scope:



This procedure is applicable to total viable count test performed for potable water, purified water and Environmental monitoring.



3.0     
Responsibility:



Microbiologist/ Designee
:
To establish the alert and action limit as per SOP.





Head/ Designee - QC
:
To check/ review and ensure compliance of SOP.





Head/ Designee - QA
:
To approve, implement and ensure compliance of SOP.


4.0
Procedure:


4.1
For establish the alert and action limit of raw water, potable water and purified water collect data of total aerobic microbial counts of all water sampling points in each water type.


       4.2
For establish the alert and action limit for environmental monitoring, collect data of TAMC counts of all points in each grade /classified area.


4.3
At least one year’s data (covering all seasons of the year) should be considered.


4.4
Calculate the mean of data.



          Mean count =    Sum of all the individual counts obtained
                                               Total number of readings


       4.5
Calculate the alert limit for potable and purified water by using following formula:



Ø Alert Limit  = Mean + (2 SD)



Ø Action limit = Mean + (3 SD)












                                  

Where,
          SD is Standard Deviation
          Xi is individual observation
          X is mean of all observations
          n is the number of observations
4.6
Calculate the alert and action limits for environment monitoring as follows:



Ø Alert Limit  = Mean + (2 SD)



Ø Action limit = Mean + (3 SD)


4.7
The calculated alert and action limits should be tabulated by the microbiologist/Designee, checked by the Head/Designee Quality Control and approved Head Quality Assurance.


4.8
Data should be reviewed after every 2 years or if there is any change in the water system or facility.


4.9
Record the Alert & Action limit for Water and Environment monitoring as per formats.


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AUTHOR
July 5, 2018 at 1:03 PM delete

Very scientific based approach

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