Post-construction

(a) On completion of the well, the well contractor shall pump or otherwise flush the well sufficiently to clear the water of cuttings. (b) The well contractor shall make a yield test to determine the quantity and stability of flow of water from the well. The date of the test and the maximum drop in water level in the well during the test shall also be recorded (drawdown). The rate of test pumping shall equal or exceed the rate of withdrawal required for the particular installation. In the case of nonpublic water supply wells with a required withdrawal rate less than ten gallons per minute, the pumping period during the drilling and clearing may be included in the time of the yield test. The minimum length of such yield test shall be four hours for a well with a required withdrawal rate of less than ten gallons per minute; 1 thirty-six hours for a well with the required withdrawl rate of from ten to fifty gallons per minute; and seventy-two hours for a well with a required withdrawal rate of more than fifty gallons per minute. Test pumping shall be continuous at a constant rate for the period required. In the case of a public well, drawdown shall have held essentially stable for the last twelve hours prior to the completion of the test. The well contractor or tester shall record the date of the yield test; the water level in the well shortly before the yield test begins; the length of the pumping period; the constant pumping rate; the water level in the well at reasonable intervals after pumping begins and within five minutes before the pumping ends; and the water level in the well at reasonable intervals thereafter for a sufficient time to allow recovery to the water level prior to the yield test. He shall furnish a copy of such record to the owner. (c) The pump installer shall disinfect each new well system before use. Disinfection shall be accomplished by treating the water in the well, storage tank and connected piping with a chlorine solution of fifty milligrams per liter (parts per million) strength so as to obtain a residual of ten milligrams per liter (parts per million) of chlorine after three hours detention. The side walls and piping shall be rinsed with the chlorine solution. The chlorinated water shall not be removed from the water system until after a detention period of at least three hours. (Effective January 12, 1971) 1 An alternate test for low yield wells serving a single family: Remove all water from the completed well and measure rate of recovery. 1. If the recovery is observed for twelve hours or more, the actual amount of water recovered in the first twelve hours shall be the yield, expressed in gallons. 2. If at least three hundred gallons are recovered in less than twelve hours, the yield expressed as gallons/day shall be computed by the formula twelve/hours recovery times gallons recovered.