Section Env-Dw 709.17 - Additional Routine Sampling Requirements(a) Subject to (c) through (f), below, if a PWS owner who is required to collect samples on a quarterly or semi-annual schedule has one or more total coliform-positive samples and the department does not invalidate the sample result(s) under Env-Dw 709.18, the owner shall collect at least 3 additional total coliform routine samples at sites that are representative of water throughout the distribution system, including all of the sample site(s) listed in the sampling schedule, during the next month the PWS provides water to the public.(b) The additional routine samples required by (a), above, shall not be considered for purposes of the triggered monitoring requirements specified in Env-Dw 717.(c) The department shall waive the requirement to collect 3 additional routine samples the next month the PWS provides water to the public if the department: (1) Performs a site visit before the end of the next month the PWS provides water to the public to determine whether additional monitoring or corrective action is needed or otherwise determines why the sample was positive for total coliforms; and(2) Establishes that the PWS has corrected the problem or will correct the problem before the end of the next month the PWS provides water to the public.(d) Once a determination is made to waive the requirement to collect the 3 additional routine samples, the department shall: (1) Document the decision in writing, have it approved and signed by the director of the department's division of water, or designee, and make this document available to EPA and the public; and(2) Describe the specific cause(s) of the positive total coliforms sample result(s) and what action(s) the PWS owner has taken and/or will take to correct the problem.(e) As a condition of receiving a waiver of the 3 additional routine sample monitoring requirement, the PWS owner shall: (1) Not seek a waiver of the requirement to collect 3 additional routine samples the next month that the PWS provides water to the public solely on the grounds that all repeat samples are negative for total coliforms; and(2) Continue to take at least one routine sample before the end of the next month the PWS provides water to the public and use it to determine compliance as specified in Env-Dw 702, unless the department has determined that the PWS owner has corrected the contamination problem before the set of repeat samples required by Env-Dw 709.15 was collected, and all repeat samples are negative for total coliforms.(f) Results of all routine and repeat samples not invalidated by the department shall be included in determining compliance as specified in Env-Dw 702.N.H. Code Admin. R. Env-Dw 709.17
(See Revision Note #1 at chapter heading for Env-Dw 700) #9700, eff 5-1-10
Amended by Volume XXXV Number 06, Filed February 12, 2015 , Proposed by #10771, Effective 2/1/2015, Expires2/1/2025.