Stormwater gravity drains may be combined with clearwater drains prior to discharging to the storm building drain only if approved by the department.

• A. They may be combined, but only with approval by the department.
• B. They may be combined at any time.
• C. They may not be combined prior to discharging to the storm building drain, unless approved.
• D. They must always be kept separate.

Answer: (C)