Fecal Response

This document is intended to fulfill the EGLE R 325.2194a contingency plan required by the state of Michigan.

The procedures are based upon the PHTA Operator Handbook (2017), EGLE Suggested Practices For Continegency and Emergency Response Plans For Public Swimming Pools and CDC Fecal Incident Response Recommendations for Aquatic Staff (2018).

Formed Stool

EGLE considers this a "limited contamination" event. The guidelines below are per PHTA, ensuring compliance with to EGLE requirements.

1. Immediately close the pool. Direct all occupants to leave the pool area.
2. Remove the contaminant from the pool and discard in a sanitary matter. Vacuuming to remove the contaminant is not recommended.
3. Clean and disinfect the net or scoop.
4. Ensure the free available chlorine is at least 2 mg/L (raise as needed), the pH is 7.5 or less and the temperature is 77 °F or higher.
5. Maintain the chlorine concentration for the period defined by the table below before opening the pool.
6. Ensure the filtration system is operational while the pool reaches and maintains proper free chlorine concentration.
7. Document the incident on the monthly operation report or a separate log sheet (see Documenting, below).
8. The pool may be re-opened once the required CT value has been achieved, the free available chlorine level has been returned to 1 to 5 mg/L and the pH is within the normal range of 7.2 to 7.5.

Free Available Chlorine Concentration for a CT Inactivation Value of 80

Free Available Chlorine (mg/L or ppm)		Contact Time (minutes)
Without Stabilizer	With Stabilizer
2.0	4.0	40
2.5	5.0	32
3.0	6.0	27
3.5	7.0	23
4.0	8.0	20
4.5	9.0	18
5.0	10.0	16

Liquid Stool (Diarrhea)

1. Immediately close the pool. Direct all occupants to leave the pool area.
3. Raise the free available chlorine to 20 mg/L and maintain the pH between 7.2 and 7.5.
   • Sample at least three widely spaced locations away from the water return outlets to verify measurements.
   • Values must be verified by appropriate means (i.e. a chlorine test strip if the colorimetric test is out of range).
   • Do not rely on the readings of automatic sensing equipment (i.e. the pH probe).
4. Maintain the chlorine concentration for the period defined by the table below.
5. Ensure the filtration system is operation while the pool reaches and maintains proper free chlorine concentration.
6. Backwash the filter thoroughly after the defined period is met.
7. Bring the free available chlorine level to the normal range (2 mg/L to 5 mg/L) and ensure the pH is between 7.2 and 7.5. This may be accomplished by dilution (re-filling the pool) or chlorine breakdown over time (may be faster during daylight hours due to UV exposure).
9. Document the incident on the monthly operation report or a separate log sheet (see Documenting, below).
10. The pool may be re-opened once the required CT value has been achieved, the free available chlorine level has been returned to 1 to 5 mg/L and the pH is within the normal range of 7.2 to 7.5.

Free Available Chlorine Concentration for a CT Inactivation Value of 14,400

Free Available Chlorine (mg/L or ppm)	Contact Time (hours)
10	24
11	22
12	20
13	18
15	16
17	14
20	12
24	10
30	8
40	6
60	4

Documenting

When an incident occurs, the even must be logged with the following information:

1. The date and time of the event.
2. The type and amount of containment.
3. The free available chlorine contamination and pH at:
   1. The time the contamination was first noted.
   2. The beginning of the contact time.
   3. The end of the contact time.
   4. The time when the pool is ready to be re-opened.
4. The procedures followed to respond to the incident (including the process used to increase free chlorine residual, if necessary)
5. The contact time.

Terminology

• CT: Concentration (C) of free available chlorine in mg/L or ppm multiplied by the contact time (T) in minutes.
• EGLE: The Michigan Department of Environment, Great Lakes and Energy (Drinking Water and Environmental Health Division)