4.—(1) Sampling must be carried out at the frequencies specified in Table 3.
Table 3 Sampling frequency for audit monitoring
| Volume m3/day | Sampling frequency per year |
|---|---|
| ≤ 10 | 1 |
| > 10 ≤ 3,300 | 2 |
| > 3,300 ≤ 6,600 | 3 |
| > 6,600 ≤ 10,000 | 4 |
| > 10,000 ≤ 100,000 | 3 + 1 for each 10,000 m3/day of the total volume (rounding up to the nearest multiple of 10,000 m3/day) |
| > 100,000 | 10 + 1 for each 25,000 m3/day of the total volume (rounding up to the nearest multiple of 25,000 m3/day) |
(2) The local authority may set a higher frequency for any parameter if it considers it appropriate taking into account the findings of any risk assessment.