A major feature introduced by the Phase II was a plan for standardizing compliance monitoring across several existing and upcoming rules. Under this Standardized Monitoring Framework, the various monitoring frequencies for most source-related contaminants were coordinated within compliance periods of three years each. Some monitoring and related system activities, such as vulnerability assessments, will occur at intervals which may span across up to three of these three-year periods, forming a nine-year compliance cycle. The first compliance cycle and the initial compliance period both began on January 1, 1993. The Table at the right gives the schedule for the Phase II compliance cycles for the next several years. Monitoring requirements are given in Table 3.
The Phase II monitoring requirements also include the following:
| Table 3. Compliance Monitoring Requirements | ||||
|---|---|---|---|---|
| Contaminant | Ground water | Surface water | Trigger that Increases Sampling | Waivers for Base Requirements |
| |
||||
| Asbestos | 1 Sample every 9 years | MCL | YES Based on Vulnerability Assessment | |
| Nitrate | Annual | Quarterly | 50% MCL | NO |
| After 1 year < 50% of MCL, Suface Water Supplies may reduce to an annual sample | ||||
| Nitrite | 1 Sample: If < 50% of MCL, state discretion | 50% MCL | NO | |
| 5 Inorganics | 1 Sample every 3 years | Annual sample | MCL | YES Based on analytical results of 3 rounds |
| 18 Volatile Organic Compounds | 4 Quarterly samples every 3 years Annual sample after 1 year of no detects |
> 0.0005 mg/L | YES Based on Vulnerability Assessment | |
| 17 Pesticides and PCBs | 4 Quarterly samples every 3 years After 1 round of no detects: systems > 3300 reduce to 2 samples per year every 3 years; systems < 3300 reduce to 1 sample every 3 years |
Method Detection Limit (MDL) | YES Based on Vulnerability Assessment | |
|
1 IOC: 1 Sample 13 SOCs: 4 consecutive quarterly samples |
N.A. | YES Based on Vulnerability Assessment | |
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