Removal of timber, rubbish, etc. Timber, logs, trees, brush, vegetable matters and rubbish of any description shall be removed and disposed of so as to leave the disturbed area with a neat and finished appearance. Tree stumps, masonry and other obstructions shall be removed to the following depths:
Paved areas — Two (2) feet below subgrade.
Lawn areas — Two (2) feet below finished grade.
Solid rock, shale or similar materials shall be removed to a depth of fifteen (15) inches below subgrade for paved area and two (2) feet below finish grade for lawn area except where it is impractical because of rock outcropping.