Rtcr General Sample Siting Plan Template - Ohio Environmental Protection Agency (Page 5 of 8) in pdf

REPEAT SAMPLING

Repeat Monitoring Tips

5. Collect Repeats within 24 Hours. If a routine sample result is total

coliform positive you must take repeat samples within 24 hours of

Avoid outside taps, taps that

notification.

swivel, and hose bibs.

a) Measure total chlorine before taking total coliform

The first tap is the same tap used

samples, if required (see Step 2).

for the routine sample(s). In

b) Collect a set of 3 repeat samples from the taps designated as

addition, select 2 other taps and

repeat sample locations in your sample siting plan.

note their location in your Sample

c) Clearly mark each sample type as repeat.

Siting Plan.

d) Ohio EPA must receive all repeat sample results no later than the

Ensure the sample locations

end of the next business day after the result was obtained. Your

listed in the Sample Submission

system will be required to complete a Level 1 Assessment if Ohio EPA

Report match the locations listed

does not receive all repeat sample results as required.

in the Sample Siting Plan.

e) A public water system is in violation of the maximum

contaminant level (MCL) for Escherichia coli (E. coli) when

If there are not 2 other taps available,

any of the following conditions occur.

a single tap may be used more than

i. The public water system has an E. coli-positive repeat sample

once, but the water must run

following a total coliform-positive routine sample.

continuously between samples for no

less than 5 minutes (if you are also

ii. The public water system has a total coliform-positive repeat

required to check total chlorine

sample following an E. coli-positive routine sample.

residual, you only need to measure it

iii. The system fails to collect all required repeat samples following

once).

an E. coli-positive routine sample.

iv. The system fails to test for E. coli when any repeat sample is total coliform-positive.

6. If any of the repeat samples are total coliform-positive, contact your district office representative immediately for

additional instructions.

SAMPLING THE MONTH FOLLOWING A TOTAL COLIFORM POSITIVE SAMPLE

7. If you are monitoring with one routine sample per quarter, you will be required to collect at least 3 routine total

coliform samples the month following the total coliform positive. If you are monitoring monthly for total coliform,

you would return to your routine monthly total coliform sampling schedule. Repeat samples do not count towards

this requirement.

References:

OAC rule 3745-81-50(B)

OAC rule 3745-81-55(B)(1)

OAC rule 3745-81-32

OAC rule 3745-81-27(D)(1)

OAC rule 3745-81-52(A)(1)

OAC rule 3745-81-53(A)

OAC rule 3745-81-54(A)

Page 5

Rtcr General Sample Siting Plan Template - Ohio Environmental Protection Agency Page 5

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