4. The undertaking must specify—
(a)the nature of the contravention and its cause or suspected cause;
(b)the water supply zone affected and the size of the population supplied;
(c)the remedial steps which are to be taken and the date by which each step is to be completed;
(d)the maximum deviation from the quality required by section 68 of the Water Industry Act 1991 in relation to each relevant parameter which the company undertakes to ensure is not exceeded while remedial steps are being taken; and
(e)the measures which are to be taken to monitor those parameters, and to prevent any danger to public health arising, during that period.