In cases when a proposed use includes new construction and/or grading of the site, the applicant, in addition to compliance with Chapter 192, Stormwater Management, of the Code of the Township of Foster, shall provide upon the site plan the contours of the site at vertical intervals of:
[1]
Not more than five feet for land with an average natural slope of 5% or less.
[2]
Not more than 10 feet for land with an average natural slope exceeding 5%.
[3]
Not more than 20 feet for land with an average natural slope exceeding 15%.