21.—(1) Subject to sub-paragraph (2), a person (“A”) is exempt from the requirement for an environmental permit to carry on the radioactive substances activity described in paragraph 11(2)(b) of Part 2 of this Schedule in respect of aqueous radioactive waste described in sub-paragraph (3) where A disposes of that waste in accordance with the conditions in paragraph 22(1).
(2) A is not exempt under sub-paragraph (1) in respect of premises, where A holds an environmental permit to carry on the radioactive substances activity described in paragraph 11(2)(b) of Part 2 of this Schedule for the disposal of aqueous radioactive waste on or from those premises.
(3) Subject to sub-paragraph (4), the waste referred to in sub-paragraph (1) is aqueous radioactive waste—
(a)which is not described in an entry in column 1 of Table 6, and
(b)with a total concentration of radioactivity which does not exceed 100 Bq/ml.
(4) Sub-paragraph (3) does not apply to aqueous radioactive waste—
(a)which a person has diluted with the intention that—
(i)the waste has a concentration of radioactivity which is below the value in sub-paragraph (3)(b), or
(ii)the condition in paragraph 22(3)(a) or (4)(b) is complied with in respect of that waste, or
(b)where the person who generated that waste did not minimise the quantity of radionuclides generated as waste to the extent reasonably practicable.