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Ellsworth Sourcewater Protection Plan, Appendix B December, 2004 Page 49 of 63

Removing a Boil Water Order

A Boil Water Order can be removed from a water system when corrections of deficiencies are made and satisfactory sampling is completed.

Deficiency

Correction

Acute bacterial violation

Turbidity MCL violation (> 5.49)

Unchlorinated surface water entering system Unfiltered surface water from emergency source System without water or negative pressure

No chlorination and chronic nonacute bacteria violations Dead animals in source water Order used in lieu of sampling Equipment failure

Establish or reestablish disinfection and maintain residuals Turbidity drops to acceptable levels throughout system Establish disinfection Suspend use of the emergency source Reestablish service and maintain positive pressure (see attached flow chart) Establish chlorination

Removal of remains and disinfection of system Reestablish sampling Repair or replacement of equipment

Boil Water Order Samples

The number of samples listed below must be taken on the same day at separate locations representative of the distribution system and must all be negative for bacteria in order to remove a Boil Water Order:

25 - 1000

3

1001 - 2000

4

2001 - 3000

5

3001 - 4000

6

4001 - 5000

7

5001 - 7500

8

7501 - 9999

9

10000 or more

10

Population Served

Number of Samples

Drinking Water Program field staff serving less than 500 population.

will take samples for all non-community systems and all community systems

Bulk Transport of Water

Disinfection Procedures for Mobile Bulk Storage Containers (MBSC) The following checklist must be followed before water may be distributed to the public from a bulk transport system (water buffalo, etc.):

  • 1.

    Notify the Drinking Water Program of the reason for deploying the bulk transport system.

  • 2.

    Inspect the container to ensure that it is watertight and free of debris.

3.

Disinfect the container for 30 minutes at 200 mg/l (AWWA Standards). 0.4 gallons of household bleach makes a 200 mg/l chlorine residual in 100 gallons of water. Use this ratio to compute chlorine additions for different amounts of water. Allow disinfected water to flow through all pipes and overflows.

MRWA Contingency Plan Template 4/03

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