That the development of any residential site does not contemplate the removal of trees over 24 inches in circumference, measured three feet above grade, except in the area of the building and in the marginal area surrounding the building to a distance of 15 feet from exterior walls or eaves of porches, and except for the purpose of creating an improved landscape plan, opening vistas, the installing of site structures such as walks, driveways, parking areas, swimming pools, courts for games and sports and other such structures, and except for reasons of safety, sanitation and the general welfare. Trees to be removed to create an improved grading and landscaping plan shall be indicated on grading or site development plans submitted in conjunction with the site plan. Removal of diseased and dead trees is not prohibited, except that girdling or poisoning of trees in order to avoid compliance with approval plans shall constitute a violation. The removal of any trees over 24 inches in circumference measured three feet above grade for any reason, except safety, sanitation, control of disease or the general welfare, prior to approval of the site plan shall constitute a violation.