Section Env-Dw 712.06 - Monitoring for Vinyl Chloride(a) Subject to (e), below, the O/O of a community water system or non-transient non-community water system shall monitor quarterly for vinyl chloride if any of the following 2-carbon organic compounds is initially detected and subsequently confirmed in the water supply:(4) 1,1,1-trichloroethane;(5) Cis-1,2-dichloroethylene;(6) Trans-1,2-dichloroethylene; or(7) 1,1-dichloroethylene.(b) The vinyl chloride samples collected pursuant to (a), above, shall be collected at each sampling point for each source at which any of the 2-carbon organic compounds was detected and confirmed.(c) If the initial test results collected pursuant to (a), above, include analytical results for vinyl chloride, the results shall be counted as the first of 4 required quarterly samples.(d) If vinyl chloride is not detected in the first quarterly sample, the department shall reduce the required monitoring for vinyl chloride to one sample during each compliance period.(e) If monitoring frequency is not reduced pursuant to (d), above, then after a minimum of one year of quarterly sampling the O/O may submit a written request to the department as specified in (f), below, for the monitoring frequency to be reduced.(f) The written request shall contain the following:(2) The PWS identifier for the PWS;(3) A summary of all quarterly sampling results; and(4) Whether any type of treatment to reduce vinyl chloride has been or is being used by the PWS.(g) The department shall reinstate annual monitoring for vinyl chloride in response to a request submitted pursuant to (e), above, if the department determines that: (1) Based on 4 consecutive quarterly samples, the level of vinyl chloride is reliably and consistently below the MCL; and(2) The PWS is not operating any type of treatment to reduce the amount of vinyl chloride.N.H. Code Admin. R. Env-Dw 712.06
(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.Amended by Volume XXXVIII Number 50, Filed December 13, 2018, Proposed by #12668, Effective 1/1/2019, Expires 1/1/2029.