Section Env-Dw 720.07 - Assessments(a) Subject to (b), below, after a coliform assessment is triggered as specified in Env-Dw 709.22, the PWS owner shall conduct a level I or level II assessment, as applicable. The PWS owner may authorize an agent who meets the qualifications specified in Env-Dw 720.08 or Env-Dw 720.09, as applicable, to conduct the assessment, but such authorization shall not relieve the owner from liability if the assessment or follow-up actions, or both, are not completed as required.(b) If a level II assessment is triggered by an E. coli MCL violation, the department or its agent shall conduct the level II assessment.(c) If assessment triggers are recurring and no cause has been identified, the department shall consult with the PWS owner to determine whether the department or another qualified individual will conduct the assessment.(d) The assessment shall: (1) Be performed by one or more individuals who meet the qualifications specified in Env-Dw 720.08 or Env-Dw 720.09, as applicable;(2) Include an on-site inspection;(3) Be conducted to identify the possible presence of sanitary defects or defects in distribution system coliform monitoring practices, or both; and(4) Be conducted within 30 days after notification from the department that an assessment has been triggered as specified in Env-Dw 709.22.(e) The assessment shall evaluate situations that might have impacted normal operations as well as water quality data and other system records related to bacterial contamination or treatment, or both, including but not limited to the following: (1) Atypical events that might affect distributed water quality or indicate that distributed water quality was impaired, including but not limited to main breaks, hydrant flushing, impacts from weather events including flooding, power failures, treatment process upsets, and loss of pressure;(2) System maintenance and operation issues, including water storage and pumping facilities, and sanitary conditions that could affect distributed water quality;(3) Source and treatment considerations and records that bear on distributed water quality, including but not limited to: a. Treatment operations, maintenance, testing, and operation; orb. Well integrity including casing, cap, seal, and vent;(4) Existing water quality monitoring data, including but not limited to compliance monitoring data, system evaluation monitoring data, disinfectant residual concentration, if disinfecting, heterotrophic plate count, if available, and treatment process performance parameters, if treatment is present; and(5) Water quality sampling locations, sampling protocol, sample processing, and techniques.(f) A level II assessment shall: (1) Be more comprehensive than a level I assessment;(2) Include a more detailed physical inspection of all suspected facilities and locations to identify all potential causes of the coliform assessment trigger; and(3) Include additional water quality monitoring if needed to identify potential causes.N.H. Admin. Code § Env-Dw 720.07
(See Revision Note #3 at chapter heading for Env-Dw 700) #9760, eff 7-30-10
Amended by Volume XXXV Number 06, Filed February 12, 2015 , Proposed by #10771, Effective 2/1/2015, Expires2/1/2025.