For Risk Level 3 site, receiving water monitoring is required when there is direct discharge to receiving waters and the effluent is outside the pH range of 6.0-9.0 or turbidity exceeds 500 NTU.

For Risk Level 3 site, receiving water monitoring is required when there is direct discharge to receiving waters and the effluent is outside the pH range of 6.0-9.0 or turbidity exceeds 500 NTU.

• A. Direct discharge to receiving waters only
• B. Direct discharge to receiving waters and pH outside 6.0-9.0
• C. Direct discharge to receiving waters and the effluent is outside the pH range 6.0-9.0 or turbidity exceeds 500 NTU
• D. Direct discharge with no monitoring

Answer: (C)

Direct water monitoring at Risk Level 3 is required only when there is a direct discharge to a receiving water and the effluent exceeds specified quality limits. The key thresholds are pH being outside 6.0 to 9.0 or turbidity exceeding 500 NTU. Because both conditions must occur together—a direct discharge plus at least one of the effluent limits being violated—the correct statement is that there is direct discharge to receiving waters and the effluent is outside the pH range 6.0–9.0 or turbidity exceeds 500 NTU. If there’s direct discharge but the effluent stays within those limits, monitoring under this rule isn’t triggered; conversely, without direct discharge, this monitoring requirement isn’t triggered either.

Direct water monitoring at Risk Level 3 is required only when there is a direct discharge to a receiving water and the effluent exceeds specified quality limits. The key thresholds are pH being outside 6.0 to 9.0 or turbidity exceeding 500 NTU. Because both conditions must occur together—a direct discharge plus at least one of the effluent limits being violated—the correct statement is that there is direct discharge to receiving waters and the effluent is outside the pH range 6.0–9.0 or turbidity exceeds 500 NTU. If there’s direct discharge but the effluent stays within those limits, monitoring under this rule isn’t triggered; conversely, without direct discharge, this monitoring requirement isn’t triggered either.