hibernacula. The drain outlet shall consist of non-perforated and perforated Schedule 40

PVC pipe, which shall be fitted with a backflow prevention valve.

15.2 Root Balls

This work shall consist of the supply and placement of salvaged tree root balls in the benched areas along the south side of the drain between Stations 0+020 to 0+070, 0+080 to 0+130, and 0+140 to 0+180. The root balls shall be salvaged from the clearing process at the beginning of construction. In order to prevent the root balls from being washed away, the stumps shall be anchored with cable and screw anchors.

15.3 Armour Rock Vanes

OPSS Forms 314, 501, 511, 1004, 1010 and 1860 shall apply and govern except as amended or extended herein. The work shall consist of construction of rock vanes at Stations 0+020, 0+072, 0+132, 0+181, 0+397, 0+469, and 0+570, as detailed in the Drawings, and shall include excavation, installation of geotextile, and placement of armour rock, gabion rock, rip-rap and round stone.

16.0 Topsoil

This work shall consist of supply, placement and grading a minimum thickness of 100mm (4”) of clean topsoil at the locations indicated in the Drawings. The topsoil supplied shall be free from roots, vegetation and other debris and shall be from a source approved by the Owner/Engineer.

17.0 Seed and Mulch

This work shall consist of all material, labour and equipment required to supply and place hydraulic seed, mulch and fertilizer on the areas indicated in the Contract Drawings and areas that have been disturbed during construction.

The seed mixture supplied shall have the following composition:

The mix shall be applied at the rate of 100 kg/hectare and the fertilizer (8-32-16) shall be applied at a rate of 200 kg/hectare.

The Contractor shall be responsible to water the planted areas as required to ensure that the seed germinates and the grass grows. Areas of the site with less than 75%