(1) A person disposing of radioactive material in a sewer must ensure that (a) the plumbing is in good condition; and(b) there are no low points in the plumbing, other than those required under the Building Act 2000 , in which the radioactive material could collect; and(c) the concentration of radioactive material in water at the point of the premises from which the radioactive material is disposed of does not exceed one-tenth of the amount specified in the Dose Coefficients Document for each 730 litres of water.Penalty: Fine not exceeding 250 penalty units.(2) A person disposing of radioactive material in a sewer must be able to prove, by calculation or measurement, that the allowable concentration level of the radioactive material in water does not exceed the concentration specified in subregulation (1)(c) .Penalty: Fine not exceeding 250 penalty units.