- (a) A sample that is invalidated under this section shall not be used to meet the monitoring requirements established in this part.
- (b) The department shall invalidate a positive sample only if the laboratory establishes, in writing, that improper sample analysis caused the positive result.
(c) A laboratory shall invalidate a positive sample if the sample:
- (1) Produces turbid culture in the absence of gas production using an analytical method where gas formation is examined, such as the multiple-tube fermentation technique; or
- (2) Exhibits confluent growth or produces colonies too numerous to count with an analytical method using a membrane filter.
- (d) A laboratory shall invalidate a negative sample if the sample contains chlorine or other disinfectant.
- (e) If a sample is invalidated under (b), (c), or (d), above, the system O/O shall collect another source water sample as specified in Env-Dw 717.05 within 24 hours of being notified of the invalidation.
- (f) The system O/O shall continue to resample within 24 hours and have the samples analyzed until a valid result is obtained.
- (g) The O/O may request an extension of the 24-hour time limit in accordance with Env-Dw 717.12 if the O/O is unable to collect samples due to circumstances beyond the O/O’s control.
Source. #9600, eff 11-21-09; ss by #12525, eff 6-1-18