1 14 15 16 Coring to determine peat layer - Sediment testing at - - PDF document

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1 14 15 16 coring to determine peat layer sediment
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1 14 15 16 Coring to determine peat layer - Sediment testing at - - PDF document

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1 14 15 16 Coring to determine peat layer - Sediment testing at samples taken at two deps 19 20 11/21/2014 - Access alternatives were evaluated. It was determined the least impact to the marsh and conservation area was utilizing an

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19 Coring to determine peat layer

  • Sediment testing at …samples taken at two deps
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  • Access alternatives were evaluated. It was determined the least impact to the

marsh and conservation area was utilizing an existing access road and construction of temporary access into the marsh to employ conventional dredging techniques for removal of material

  • First iteration of site plans broke project up into 7 distinct cells so the project

could be completed as time and resources allowed Four Alternatives including Do Nothing Preferred Alternative selected by Rattray Marsh Steering Committee Alternative One: Removal of Mineral soils, Management of Invasive Outlet structure to control Carp Alternative Two: Dyke/Levy System to restrict movement of carp from creek and lake Preferred Alternative: Phased removal of mineral soil 11/21/2014 21

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First Three Cells. 11/21/2014 22

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24 Constructed to a width of 9m and height of approximately 1m above grade 1900 tones of stone, 130k project contribution

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  • Prior to beginning any of the sediment removal CVC installs wildlife exclusion

fencing around the preimiter of the project boundary.

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26 CVC times installation of exclusion fencing with the drawdown of the marsh leaving areas of groundwater discharge open and installs exits doors at strategic locations to allow fish and wildlife out of the project area before marsh is drawn down to mud flat as lake levels recede for the winter.

  • Active and passive removal of fish and wildlife is also conducted.
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28 Trapped and tagged 5 and tracked 5 snapping turtles for two seasons to determine preferred over wintering areas for turtles to minimize and potential impacts.

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  • Sediment removal occurs in the winter months when the marsh is frozen and

in low water condition.

  • Frozen conditions helps to support the heavy equipment that is required to

conduct the work.

  • Contractors also utilize the ice and steel plates to construct temporary access

roads into the marsh.

  • Working in the winter also minimizes impacts to sensitive fish and wildlife that

use the marsh during the warm weather months.

  • Phase I project stats

Approx 13 days on site Approx 9 Days trucking 154 trucks + 31 trailers for a total of 185 loads taken out. 27 trucks with 6 having trailers was most sediment removed in one day 11/21/2014 30

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Trucking and peat 11/21/2014 31

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11/21/2014 33

  • Aquatic plants sourced from Native nursery
  • Top right shows one season growth – filled in completely 1 square metre
  • TOP – submergent; Bottom - sedges
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  • Aquatic plants sourced from Native nursery
  • Top right shows one season growth – filled in completely 1 square metre
  • TOP – submergent; Bottom - sedges
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With the assistance of Canadian Wildlife Service -Pre restoration Monitoring – 2010 Durham Region Coastal Wetland Monitoring Protocol 2013 – Great lakes Coastal Wetland Monitoring Plan 2014 – Post construction monitoring plan **2010** Durham Region Coastal Wetland Monitoring Protocol 11/21/2014 35

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Carp Vandallistm

  • Monitoring data – visibility

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37 EA also recommended carp control as part of the restoration plan CVC

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38 EA also recommended carp control as part of the restoration plan CVC

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11/21/2014 39

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  • Shale/Sediment bar continues to form at the mouth of Sheridan Creek, a

portion of this bar was orginally slated to be dredged

  • Revisited this with Geomorphologist and determined that it would

continue to function as an area of deposition and any gains obtained from dredgeing would be short lived.

  • Some of the material deposited here moves out to the lake during high

flows.

  • Also identified in the EA as a desirable area for shorebirds
  • Helping to naturally isolate the southern basin of the marsh during low

water levels.

  • Phragmites has continued to expand into the southern basin and water level

making chemical treatments difficult

  • Modified site plans to omit areas of continued deposition, preserve stands of

cattails not infested prhramites,

  • Increase depth to dredging to 1-1.5m in highest phragmites density (Cell A)
  • Approx 6000m3i in total

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