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Ellsworth Sourcewater Protection Plan, Appendix B December, 2004 Page 46 of 63

  • 7.

    Dead animals (mice, moles, rats, etc.) observed in an unchlorinated groundwater source.

  • 8.

    In lieu of routine sampling where chronic contamination has occurred.

Start

NO

Did distribution pressures drop below 20 psi during the maint/repair emergency incident ?

YES

PUBLIC WATER SUPPLIER RESPONSE TO LOSS OF PRESSURE TO ALL OR PARTS OF THE DISTRIBUTION SYSTEM

NO

W as the distribution line fully or partially dewatered ?

YES

Can the affected distribution lines be disinfected in accordance with AW W A standards ?

NO

YES

Complete repair and/or restore normal pressure

Disinfect in accordance with AW W A standards.

Can the affected distribution lines be adequately flushed ?

NO

IMMEDIATELY issue a Boil Water Order and notify the Drinking Water Program

YES

Flush until the chlorine residual reaches normal operating levels or until a minimum of two volumes of the affected line is flushed, whichever is greater. If the water is not clear after the prescribed flushing, continue to flush until water clears.

NO

Immediately collect bacteriolagical samples from the distribution system.

STOP No further action necessary

YES

Are all samples negative ?

NO

Are any samples fecal positive?

YES

*Dewatering occurs when the distribution system is depressurized to perform line repair or replacement.

Developed by AWWA.

9.

Equipment failure resulting in inadequate disinfection and/or filtration of a surface water supply not immediately repairable.

MRWA Contingency Plan Template 4/03

Page 21

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