Notes: {s022} check monitoring at treatment works is required only when chloramination is practised. In other circumstances, audit monitoring is required. | ||||
(1) | (2) | (3) | (4) | (5) |
---|---|---|---|---|
Item | Substances and parameters subject to check monitoring | Volume of water supplied m3/d | Reduced | Standard |
1. | E. coli | <20 | 4 | |
2. | Coliform bacteria | 20 – 1,999 | 12 | 52 |
3. | Colony counts | 2,000 – 5,999 | 52 | 104 |
4. | Residual disinfectant | 6,000 – 11,999 | 104 | 208 |
.12,000 | 104 | 365 | ||
5. | Nitrite {s022} | <20 | 2 | |
6. | Turbidity | 20 – 999 | 2 | 4 |
1,000 – 1,999 | 6 | 12 | ||
2,000 – 5,999 | 12 | 24 | ||
6,000 – 9,999 | 18 | 36 | ||
10,000 – 15,999 | 26 | 52 | ||
16,000 – 32,999 | 52 | 104 | ||
33,000 – 49,999 | 78 | 156 | ||
50,000 – 67,999 | 104 | 208 | ||
68,000 – 84,999 | 130 | 260 | ||
85,000 – 101,999 | 156 | 312 | ||
102,000 – 119,999 | 183 | 365 | ||
120,000 – 241,999 | 365 | 730 | ||
242,000 – 484,999 | 730 | 1,460 | ||
485,000 – 728,999 | 1,095 | 2,190 | ||
Substances and parameters subject to audit monitoring | ||||
7. | Nitrite {s022} | <20 | 1 | |
20 – 999 | 4 | |||
1,000 – 49,999 | 8 | |||
50,000 – 89,999 | 12 | |||
90,000 – 299,999 | 24 | |||
300,000 – 649,999 | 36 | |||
650,000 | 48 |