Section Env-Dw 717.06 - Invalidation of Source Water Samples(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.N.H. Admin. Code § Env-Dw 717.06
Amended by Volume XXXVIII Number 23, Filed June 7, 2018, Proposed by #12525, Effective 6/1/2018, Expires 6/1/2028.