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(a) Unpolluted water shall not be discharged through direct or indirect connection to the sanitary sewer system unless a permit is issued by the city. As used in this section, unpolluted water shall include storm water from roofs, yards, foundation or under-drainage, which meets all state and federal requirements for discharge to surface waters of the United States. The superintendent may approve the discharge of such water to the sewer system only when no reasonable alternative method of disposal is available. If a permit is granted for the discharge of such water into the sewer system, the user shall pay the applicable charges and fees and shall meet such other conditions as required by the superintendent.
(b) Non-emergency once-through cooling water from systems using potable water as a coolant shall not be discharged to the sanitary sewer system; provided that the superintendent may approve an exception in the following instances:
(1) For once-through cooling water used for bench top reflux or distillation or other similarly sized activity; or
(2) For short term use only, upon the determination that the use is for a research activity for which another source of cooling is not easily available.
(Ord. 5084 § 2 (part), 2010)