An application to the City Planning Commission for certification, authorization or special permit and to the Department of Buildings respecting any development, enlargement or site alteration, to be made within any Special Natural Area District, shall include the following:

(a)        a survey map prepared by a registered surveyor showing topography at two-foot contour intervals and indicating the average percent of slope, the existing slope of the land, as it occurs, in categories of 10–14 percent, 15–19 percent, 20–24 percent, 25 percent and greater; the location of existing buildings or other structures, patios, decks, swimming pools, walkways, driveways and private roads, including sidewalks and other impervious surfaces; and the location, caliper and species of all trees of six-inch caliper or more on the zoning lot and in the sidewalk area of the adjacent streets, location of geologic features, aquatic features and botanic environments, as en–umerated in Section 105-11 (Description of Natural Features);

(b)        photographs showing the location and condition of such natural features for verification with pre-existing aerial survey and/or other photographs for each Special Natural Area District;

(c)        a site plan prepared by a registered architect or professional engineer indicating the location of all existing buildings or other structures; the location of all proposed buildings or other structures; the location of existing and proposed patios, decks, swimming pools, walkways, driveways and private roads, including sidewalks and other impervious surfaces; the location of any steep slopes, steep slope buffer areas and the staging area; and the location, caliper and species of all trees of six-inch caliper or more on the zoning lot and in the sidewalk area of the adjacent streets. The site plan shall identify those trees proposed to be removed and those trees proposed to be preserved, indicating, for the latter, the critical root zone and in addition, for Tier II sites, the location of any other area of no disturbance;

(d)        a drainage plan and soil report prepared by a professional engineer, when necessary to assess whether or not there will be major impact on natural features. The drainage plan shall describe the temporary (during construction) and permanent measures to collect, direct and discharge stormwater drainage from the site, indicating the direction of drainage flow and providing detailed plans and locations of all surface and subsurface drainage devices, walls, dams, sediment basins, stormwater storage (detention and retention) facilities, and other drainage facilities and protective devices. Such report shall include an estimate of runoff from the site after completion of any proposed development, enlargement or site alteration and provide a description with supporting information of the manner in which the proposed development, enlargement or site alteration complies with the requirements of Local Law 103 of 1989;

(e)        a grading plan showing all existing and proposed contours at two-foot intervals, critical spot elevations, tops and bottoms of proposed slopes over 10 percent gradient and will indicate at least one longitudinal and one latitudinal cross-section showing both the original and proposed final ground surfaces, with grades, slopes and elevations noted;

(f)        a landscaping and revegetation plan, prepared by a registered landscape architect, indicating the extent of vegetation and topsoil removal required for site preparation and development and the location and species of all new plantings;

(g)        any other information necessary to evaluate the request; and

(h)        for developments, enlargements and site alterations on Tier II sites, the application shall also include:

(1)        an alignment and paving plan for any private road with a typical cross-section; and

(2)        a construction plan prepared by a registered landscape architect, registered architect, licensed surveyor or professional engineer showing the proposed location for the staging area, the proposed method for protecting trees, understory shrubs and ground cover during construction, as well as a description of the equipment to be employed in processing and disposing of soil and other material to be removed from the site; and if the critical root zone is proposed to be modified, a tree protection plan for any tree proposed for preservation.

For a site alteration, enlargement or development within any Special Natural Area District, the Commission may modify one or more requirements set forth in paragraphs (a) through (h) of this Section, when such modification is requested by the applicant in writing and when the Commission determines that the requirements are unnecessary for evaluation purposes.

Appendix B of this Chapter should be used as a guide to assist in identifying the natural features on the survey required in this Section.

The applicant's submission shall also include a statement admitting authorized Department of City Planning personnel to the site for the purposes of recording or verifying survey data.

Where a permit is required for a development, enlargement or site alteration within a Special Natural Area District from any City or State agency, an application for such permit shall be filed simultaneously with such agency and the Commission.