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§ 141.605 Subpart V compliance monitoring location recommendations.
(a) Your IDSE report must include your recommendations and justification for where and during what month(s) TTHM and HAA5 monitoring for subpart V of this part should be conducted. You must base your recommendations on the criteria in paragraphs (b) through (e) of this section.
(b) You must select the number of monitoring locations specified in the table in this paragraph (b). You will use these recommended locations as subpart V routine compliance monitoring locations, unless State requires different or additional locations. You should distribute locations throughout the distribution system to the extent possible.
| Source water type | Population size category | Monitoring frequency 1 | Distribution system monitoring location | |||
|---|---|---|---|---|---|---|
| Total per monitoring period 2 | Highest TTHM locations | Highest HAA5 locations | Existing subpart L compliance locations | |||
| Subpart H: | ||||||
| <500 | per year | 2 | 1 | 1 | ||
| 500–3,300 | per quarter | 2 | 1 | 1 | ||
| 3,301–9,999 | per quarter | 2 | 1 | 1 | ||
| 10,000–49,999 | per quarter | 4 | 2 | 1 | 1 | |
| 50,000–249,999 | per quarter | 8 | 3 | 3 | 2 | |
| 250,000–999,999 | per quarter | 12 | 5 | 4 | 3 | |
| 1,000,000–4,999,999 | per quarter | 16 | 6 | 6 | 4 | |
| ≥5,000,000 | per quarter | 20 | 8 | 7 | 5 | |
| Ground water: | ||||||
| <500 | per year | 2 | 1 | 1 | ||
| 500–9,999 | per year | 2 | 1 | 1 | ||
| 10,000–99,999 | per quarter | 4 | 2 | 1 | 1 | |
| 100,000–499,999 | per quarter | 6 | 3 | 2 | 1 | |
| ≥500,000 | per quarter | 8 | 3 | 3 | 2 | |