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Fig. 1 : Suggested steps in creating ditch corridor <br /> (note: all slope gradients are shown as true) <br /> - - ---------------------------------------------------------------------- <br /> Step 1 - identification of boundaries <br /> ID highway/pit edge <br /> \ ID point about 75'to 100'south of ditch corridor <br /> highway cut _ Existing surface j <br /> ID ditch location ` - - - - - - - <br /> Future final surface j <br /> ------------------------------------------------------------------------------------------------------' <br /> ------------------------------------------------------------------------------------------------------ <br /> Step 2 - Excavate corridor <br /> ID highway/pit edge <br /> y <br /> highway cut - - - - - - - - - - - - - - - - <br /> Existing surface <br /> Future final surface <br /> ------------------------------------------------------------------------------- ----------------' <br /> ------------------------------------------------------------------------------------------- <br /> Step 3 - Topsoil and seed slope as corridor is created <br /> ID highway/pit edge <br /> highway cut Existing surface <br /> topsoil and ` - _ _ _ _ <br /> ' vegetation " _ " ' " " " " ' " " " " ' " " <br /> I 9 Future final surface <br /> ------------------------------------------------------------------------------------------------------' <br /> ------------------------------------------------------------------------------------------------------ <br /> Step 4 - Install ditch when corridor <br /> ID highway/pit edge <br /> completely excavated <br /> j \ ditch <br /> highway cuty Existing surface <br /> g y <br /> topsoil and <br /> vegetation Future final surface <br /> ------------------------------------------------------------------------------------------------------ <br /> - - ------------------------------------------------------------------------------ <br /> Step 5 - Continue with mining remaining sand <br /> ID highway/pit edge <br /> ditch <br /> highway cutJ Existing surface <br /> ....................................... <br /> Remaining sand removed <br /> topsoil and <br /> vegetation Final surface <br />