(a) A topographic map of existing terrain with contour intervals adequate to show the nature and variations in the terrain; two foot intervals for grades less than 15%; five foot intervals for grades greater than 15%; elevations of critical spots, rock outcrops and special characteristics.

(b) Where necessary to determine that lots will be usable, the Department may recommend and the Board may require plan for each lot, in conformance with the grading and drainage regulations required by the City, showing the natural topography of the total parcel to be platted, the location and size of all structures, the finished grade at all improvement locations and the depth and extent of all cuts and fills.

(c) A report of a proper soil investigation by a licensed geologist or engineer to determine any geological hazard and soil bearing quality.

(d) The location of existing and proposed conservation easements.

(a) A final grading plan which conforms to the requirements of the grading and drainage regulations in this chapter and required by the City.

(b) A detailed topographic map at larger scale and closer contour interval or suitable cross sections or profiles of area where streets, driveways, buildings, utility or grading construction is proposed.

(c) Road profiles and cross sections at all significant changes in the cross slopes; the cross section to show proposed and natural grade at the centerline of the road, edge of roadway, the right of way line and the proposed building setback lines.

(d) Locations of all building sites and proposed driveways.

(a) Street and private access way grades shall conform as closely as possible to natural topography, but shall not exceed 15%.

(b) Street grades exceeding 12% shall have a maximum length of 600 feet.

(c) Upon approval of the City Engineer, horizontal alignments may provide curves with less than 100 feet centerline radius.

(d) Upon the recommendation of the City Engineer and approval of the Board, alternate methods of turning and backing areas may be substituted for turnarounds.

(e) Upon approval of the City Engineer, required paving width of the traffic lanes may be modified when off street parking bays are provided, developed and paved in the public right of way.

(f) The centerline of the paving may be offset from the centerline of the right of way to provide parking bays in the right of way.

(g) Where bridle trails are approved, sidewalks may be replaced by the trails on the upgrade side of the right of way.

(h) Vertical curbs shall be required on the downhill side of streets having grades of 6% or greater; concrete U or V gutters may be installed in lieu of conventional rolled or vertical curbs elsewhere.

(i) On a corner lot, no grading shall be allowed which results in the ground level being raised so as to obstruct the vision more than a height of three feet above the grade of either street within an area formed by the lot lines on the street sides of such lot and a line joining points on such lot lines located a distance of 33 feet from the point of their intersection.

(j) Transverse street cross sections with the gutter on the uphill side may be used where approved by the City Engineer.

(k) All cut and fill slopes shall be within the roadway right of way or roadway easement; slope maintenance easements for roadway cuts and fills may be required by the City Engineer.

(l) All excavated material shall be removed from lots and roadways or contained behind retaining walls or otherwise placed so that the slopes of any fill material will not be visible from any public street.

(m) Panhandle, double frontage and other unorthodox lots, including lots which have a width to depth ratio greater than one to three, shall be permitted if it can be adequately demonstrated that their design will eliminate excessive cuts and will not adversely affect any other lot so arranged.

(n) Private access ways may be permitted to provide access to lots in lieu of the required street frontage. Each private access way serving one lot shall be a minimum of 20 feet wide with a minimum paved surface of 12 feet in width, and each private access way serving more than one lot shall have a minimum paved surface of 24 feet in width or as may be otherwise required by city standards and specifications. Where needed, additional easements for drainage or utilities shall be provided.

(o) Maximum driveway grades shall be 20%.

(p) Building sites shall be free of geological hazards.