Amendment of Schedule 1 Concentrations and Values
7. For Schedule 1 Part 2 (Indicator Parameters) substitute—
“PART 2Indicator Parameters
| Parameters | Maximum concentration or value or state (unless otherwise stated) | Units of measurement |
|---|---|---|
(1) The water should not be aggressive. | ||
(2) Excluding tritium, potassium-40, radon and radon decay products. | ||
(3) Where treatment to reduce the level of radionuclides in water intended for human consumption has being taken, monitoring must be carried out under Schedule 3 Part 1 to ensure the continued efficacy of treatment. | ||
(4) If the gross alpha activity exceeds 0.1Bq/l or the gross beta activity exceeds 1.0Bq/l analysis for specific radionuclides is required. | ||
(5) Remedial action is deemed to be justified on radiological protection grounds, without further consideration, where radon concentrations exceed 1000Bq/l. | ||
(6) If tritium concentration exceeds its parametric value an investigation (which may include analysis) of the presence of other artificial radionuclides must be carried out. | ||
(7) Only in the case of surface water treatment where the parametric value should be strived for the water ex-treatment works.” | ||
| Ammonium | 0.50 | mgNH4/l |
| Chloride(1) | 250 | mgCl/l |
| Clostridium perfringens (including spores) | 0 | Number/100ml |
| Coliform bacteria | 0 | Number/100ml |
| Colony counts | No abnormal change No abnormal change | Number/1ml at 22oC Number/1ml at 37oC |
| Conductivity(1) | 2,500 | µS/cm at 20oC |
| Hydrogen ion(1) | 9.5 6.5 (minimum) | pH value pH value |
| Sulphate(1) | 250 | mgSO4/l |
| Indicative dose (for radioactivity)(2) (3) (4) | 0.10 | mSv/year |
| Radon (for radioactivity)(3) (5) | 100 | Bq/1 |
| Total organic carbon(TOC) | No abnormal change | mgC/l |
| Tritium (for radioactivity)(3) (6) | 100 | Bq/l |
| Turbidity(7) | 1 | NTU |