For the purposes of this subsection, "significant existing source" means a significant existing source of storm water pollution based on quantity or quality standards for storm water from a developed area that was in existence prior to July 1, 1997 and is located in the direct watershed of a waterbody that is impaired due to urban runoff.__The department shall identify significant existing sources as provided in this subsection.

A. The department shall develop a total maximum daily load for the watershed of a waterbody impaired due to urban runoff prior to designating significant existing sources within the watershed.

B. The department shall adopt rules prior to requiring that an owner or operator of a significant existing source within the direct watershed of a specific waterbody obtain approval of a storm water management system.__Rules adopted pursuant to this paragraph are routine technical rules as defined in Title 5, chapter 375, subchapter 2-A.__The rules must include, but are not limited to, the following:

(1) The name of or other means of identifying the waterbody that is impaired due to urban runoff;

(2) A list of significant existing sources or a description of the types or classes of significant existing sources;

(3) A date or schedule indicating when approvals must be obtained; and

(4) Storm water quantity and quality standards for storm water management systems.

C. The owner or operator of a site designated as a significant existing source shall apply to the department for approval of a storm water management system.

D.__"Significant existing source" does not include:

(1)__Types of sources or activities described in subsection 7;

(2)__The developed area of a facility required to meet ongoing storm water management standards pursuant to a