Section Env-Ws 372.15 - Pumping Tests(a) For all NTNC water systems whose reliability is directly important to public health as specified in Env-Ws 372.02(g), the water system owner shall demonstrateadequate source capacity by a sustained 48-hour pumping test at a constant rate before final plans can be approved. The pumping test shall demonstrate stabilized drawdown for at least the last 12 hours of the test. Stabilization is defined as a drawdown of less than one inch in 2 hours. If stabilization is not achieved, the pumping test shall continue and the department shall be contacted.(b) The water system owner shall submit data documenting the pumping test on a pumping test log sheet thatincludes the following items: (2) The date of the pumping test;(3) The p umping rate, in gallons per minute (gpm);(4) The l evel of water in the well prior to pumping in feet below top of casing;(5) The d rawdown level during pumping, in feet below top of casing;(6) The time the test was initiated and concluded and the total hours of the test; and(7) A g raph showing drawdown versus time curve, to scale.(c) Each log sheet shall be identified by project name, location, and submittal date.(d) Readings for water level and pumping rate shall be taken at least every hour so long as the change in drawdown exceeds 2 feet per hour. Thereafter, readings may be taken at appropriate intervals not to exceed 4 hours. Readings shall be direct measurements and not inferred from pump curves or other inferential methods.(e) Where wells are within 150 feet of each other, the pumping tests shall be run simultaneously.(f) Pumping tests for small community water systems shall be performed in accordance with Env-Ws 378 or Env-Ws 379.N.H. Code Admin. R. Env-Ws 372.15
(See Revision Note at chapter heading Env-Ws 300) #6521, eff 6-4-97; ss by #8360, INTERIM, eff 6-4-05, EXPIRES: 12-1-05; ss by #8496, eff 11-30-05