In consideration of existing or future significant threats related to stormwater discharges, the City of Port Colborne shall, within five years from the date the Source Protection Plan comes into effect, prepare and implement a comprehensive stormwater management master plan for the catchments outletting to the Port Colborne IPZ-1 and IPZ-2. The stormwater management master plan will be prepared in accordance with the Municipal Class Environmental Assessment and will include:

(a) an evaluation of the cumulative environmental impact of stormwater from existing and planned development;
(b) a determination of the effectiveness of existing stormwater management works at reducing the negative impacts of stormwater on the environment;
(c) an examination of any stormwater retrofit opportunities that have already been identified for areas where stormwater is uncontrolled or inadequately controlled;
(d) the identification of additional stormwater management retrofit opportunities or improvements to existing stormwater management works that could improve the level of treatment;
(e) a description of existing or planned programs for regular maintenance of stormwater management works;
(f) an identification of the recommended approaches for stormwater management; and
(g) an implementation plan for the recommended approaches.

M6: By February 1st of each year, the City of Port Colborne shall report to the Source Protection Authority on the steps it has taken in the previous calendar year to implement the significant threat policies.