Procter & Gamble Inc. - Environmental Compliance Approval (sewage)

This proposal is for amendment to an existing Environmental Compliance Approval (industrial sewage works) No. 0836-BYTSTU for existing stormwater management facilities to service a proposed building, with rooftop control, and small pockets of paved areas of the existing Procter and Gamble Inc. site located at 355 University Avenue in Belleville.

The project consists of proposed development works including new parking lots (north of the site), proposed building (0.52 hectares) north of the existing building with rooftop control, and small pockets of paved areas. In the existing condition, the site is serviced by an existing dry pond, ditches, and oil grit separator (OGS). There is an existing amended Environmental Compliance Approval (ECA) permit in place for the existing dry pond, ditches, and OGS. The existing amended ECA permit number is 0836-BYTSTU (issued May 17, 2021).

The proposed stormwater management (SWM) strategy is to introduce proposed SWM features in the form of proposed dry pond (with active storage volume of 2156 cubic meters), controlled by 225 millimetres orifice and 1.25 meter weir, and 16 metre emergency spillway. The proposed dry pond provides quantity control for the proposed north parking lot. The runoff from the proposed dry pond is conveyed by grassed swale with bottom width of 1 meter, side slopes of 3H:1V and longitudinal slope of 0.3%, which provides some degree of treatment. Additional treatment is provided by the existing ditches and downstream OGS.

Future developments involving additional parking lot areas will require similar at-source or upstream proposed SWM controls. The proposed building (0.52 hectares) with rooftop control has a controlled release rate of 42 litres/second/hectares or 0.022 cubic metres per second.