Section Env-Dw 406.13 - Pumping Tests(a) For all non-community water systems having a design capacity of 13,500 gpd or greater, the water system owner shall demonstrate adequate 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 that includes the following items: (2) The date of the pumping test;(3) The pumping rate, in gallons per minute (gpm);(4) The level of water in the well prior to pumping in feet below top of casing;(5) The drawdown level during pumping, in feet below top of casing; and(6) The time the test was initiated and concluded and the total hours of the test.(c) Each log sheet shall be identified by project name, well number or 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) For any proposed non-community water system well where a pumping test is not conducted, the well driller shall provide a signed statement of the well's projected safe yield to the department.N.H. Code Admin. R. Env-Dw 406.13
(See Revision Note at part heading for Env-Dw 406) #10613, eff 6-1-14