• Rapid spill response procedures to remove contaminants from the watercourse shall be implemented to restore water quality and returning the water to acceptable sediment concentrations (ex: booms, spill pads, etc.);
o Hydrocarbons associated with the release of any fuels or hydraulic fluids from construction equipment are anticipated to be light non-aqueous phase liquids (LNAPL) and will form a thin layer on top of the water. These liquids shall be suctioned off the top of the water as soon as possible following a spill;
• Equipment fueling and maintenance will only be performed at designated laydown areas. These laydown areas will be located away from the shoreline;
• Construction material, excess material, construction debris, and empty containers shall be stored away from any watercourse and will be stabilized in a manner that prevents them from entering any waterbody;
• All materials used to provide environmental protection shall not contain deleterious substances.
• All construction debris and litter will be removed daily, or as required;
• Any materials (such as the gabion stone or armour stone) being used for in-water construction shall be inspected for the presence of excessive dust prior to installation. These materials shall be washed on an as-needed basis to prevent surface dust from entering the river during rock placement;
• Any construction equipment or machinery shall be clean, in good working order and properly maintained so as to reduce the risk of any deleterious materials being transferred to the water;
• Erosion and sediment control measures shall be inspected on a daily basis so that they remain as effective as possible; and
• Work will be interrupted on an as-needed basis to allow for any sediment plumes to dissipate before resuming construction.
A turbidity curtain will be used in the nearshore area during “key-in” of the jetty at the river bank where excavation works will occur. As it is anticipated that greater turbidity will occur during this phase of the work, the turbidity curtain will contain this sediment and allow it to settle out. As noted above, to further mitigate sediment, the rock placement will be slow and controlled (and not require any in-river excavation) and turbidity levels will be continually monitored. Should turbidity levels exceed acceptable levels, defined in the Fisheries Plan, works shall cease to allow conditions downstream return to normal, at which time the works can re-commence.