The developer or applicant shall file fifteen (15) copies of the preliminary site plan prepared on twenty-four (24) by thirty-six (36) inch sheets to the Zoning Enforcement Officer on behalf of the Planning and Zoning Commission. Such plans shall show the location and size of buildings and structures as well as mobile home pads, site layout, parking areas, drives, walkways, recreation and common areas, refuse disposal areas, required buffers, and general location, type and capacity of utilities including storm water, drainage, sanitary sewer, electric, gas, cable, telephone and other utilities. Preliminary site plans shall also include general grading and landscaping plans reflecting thereon existing and proposed contours at vertical intervals of not more than two (2) feet referred to sea level datum which shall reflect thereon the location of major existing growth to be retained as well as new planting and landscaping plans.