Surface Elevations

The approved Lot Grading Plans have proposed surface elevations (design grades) at specific locations indicating the height in meters. The As Built Certificate has existing elevations taken at the same points as the design grades.

Acceptable Design Tolerances for Ground Surface Conditions:
  • Clay: -7 cm to -20 cm below final grade eg: Design Grade 682.25 m, Existing Grade 82.10 m = 15 cm below design grade.
  • Topsoil (black dirt) : 0 cm to -10 cm below final grade eg: Design Grade 682.25 m, Existing Grade 682.20 m = 5 cm below design grade. ( Note: "0" is at approved design grade)
  • Finish landscaping (sod, concrete): -10 cm to +10 cm above or below final grade eg: Design Grade 682.25 m, Existing Grade 682.3 0m = 5 cm above design grade. ( Note: The exceptions are loose stone, washed rock or wood chips. Surface elevation below these materials must be within the tolerance.)
The Lot Grading Inspector has discretion to accept elevations that are not within design tolerances when the following conditions occur:
  • Existing elevation is graded to match an existing fence, walkway, lake, park, curb, sidewalk, road or lane and does not impact on surface drainage.
  • Existing elevation is graded to match an adjacent property and it appears to the Lot Grading Inspector that there is positive surface drainage on both lots.
  • A red-line revision was made to the design elevations on the previously approved Lot Grading Plan reflecting changes from original design.
Please note, in cases where existing conditions make it difficult to achieve design tolerances, such conditions must be brought to the attention of the parties affected and the Lot Grading Inspector. In addition, where changes have been accepted, those changes will be noted on the Lot Grading Inspection Report and stamped on the Lot Grading Certificate.

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