Erosion control plans prepared in accordance with Subarticle 13 of the grading manual shall be submitted to the city official for approval by September 15th each year for projects under grading permit. The erosion control plan may be waived for grading projects on single residential lot projects providing that an erosion control system, meeting the approval of the city official, has been installed, placed, planted or constructed before October 15th. (Ord. 48, 1990)