SCHEDULE 4Monitoring for indicative dose and analytical performance characteristics
Screening strategies for gross alpha activity and gross beta activity3
1
A water undertaker may use a screening strategy for gross alpha and gross beta to monitor for the parametric indicator value for indicative dose.
2
Subject to sub-paragraph (3) the recommended screening values are—
a
0,1Bq/l for gross alpha activity; and
b
1,0Bq/l for gross beta activity32.
3
If the gross alpha activity exceeds 0,1Bq/l or the gross beta activity exceeds 1,0Bq/l, analysis for specific radionuclides is required.
4
The Welsh Ministers may set alternative screening levels for gross alpha activity and gross beta activity where it can be demonstrated by the water undertaker that the alternative levels are in compliance with an indicative dose of 0,1 mSv.
5
The radionuclides to be measured must be based on all relevant information about likely sources of radioactivity.