(A) General design requirements.
(1) Required right-of-way: The minimum right-of-way width is 50'.
(2) Required minimum street section: Streets shall be constructed to minimum earth street standards and have a minimum travel way width of 18'.
(3) Required minimum street elevations: The minimum street centerline elevation at finish grade shall be 6.5' above mean sea level.
(4) Required minimum profile gradient: The minimum street profile centerline gradient shall be 0.4% except for causeways where land areas adjacent to the road embankment are jurisdictional wetlands or critical area.
(5) Street centerline minimum curve radius criteria: Street centerline curve radii shall meet AASHTO guidelines for the design speed limit.
(6) Where streets are designed for less than a 30 mph speed limit, the design professional shall provide supporting design data, including traffic control signage.
(7) All roads shall be designed with a minimum road centerline radius of 125'. Horizontal sight distances shall be considered in the design process. Vertical curves shall have a minimum length of 100'.
(B) Roadway drainage design. The roadway drainage design must show, at a minimum, how the drainage is directed away from the travel way.
(C) Construction plans and specifications.
(1) The construction plans shall clearly show all work to be performed in plan view, profile, cross section, details, and specifications. Specifications providing written descriptions of the work, workmanship, appearance, materials, etc., and/or special provisions may either be shown on the drawings or presented in booklet form separate from the drawings. Specifications shall comply with the CTC (SS) or SCDOT (SS), unless otherwise directed by the Public Works Director.
(2) The following standards shall be observed and the information listed below shall be provided in the design and preparation of plans, profiles, details, drainage plans, and written specifications for construction:
(a) Include a copy of the approved preliminary plat.
(b) Plans and profiles shall be prepared on 24" x 36" or 22" x 34" sheets, having a profile at the bottom and a plan view at the top, with both the plan and profile stationing oriented in the same direction.
(c) All elevations shall be referenced to the mean sea level datum for NGVD 29.
(d) Scales shall be: vertical 1" = 2' and horizontal 1" = 50' or larger.
(3) The following shall be shown in the plan view:
(a) Stations along the centerline of the proposed road with appropriate ties at intersecting streets.
(b) The width of the right-of-way and names of proposed roads and existing roads.
(c) Alignment information, curve data with P.C., P.T., and P.I. angle points, as well as angles at intersections.
(d) Arrows indicating the direction of drainage flow within the right-of-way.
(e) Size, type, and location of trees proposed to remain within the clearing limits of the road right-of-way.
(f) DHEC/OCRM Critical Line and USACOE jurisdictional wetland delineations which relate to the right-of-way or easements.
(g) Benchmarks with locations, descriptions, coordinates, datum, etc.
(h) Details shall show sight distances, traffic control devices, design speeds for roads and other related information.
(i) Other general construction details required to define the scope of work.
(4) Profiles shall show:
(a) Existing street centerline elevations showing all breaks in grade, but in no case more than 100' apart. Profiles shall include existing streets to which ties are being made with elevations extending approximately 200' from the intersection.
(b) Proposed street centerline profile with centerline elevations every 50' on vertical curves and at 100' along tangents and at intersections.
(c) Statement to be placed by design professionals on road and drainage plans: "ALL MATERIALS AND WORKMANSHIP SHALL BE IN ACCORDANCE WITH REQUIREMENTS OF THE TOWN OF JAMES ISLAND ZONING AND LAND DEVELOPMENT REGULATIONS."
(d) Statement to be signed by the owner or the authorized agent of the owner: "I certify as an agent for or as a record owner, lessee, or record easement holder, I have, or will have prior to undertaking the work the necessary approval or permission from all other persons with a legal interest in said property to conduct the work proposed in the approved subdivision construction plans."
(D) Clearing and grubbing. Except as otherwise stated herein, all secondary rural road rights-of-way shall be cleared and grubbed for a minimum width of 40'. Any/all tree canopies shall be pruned to a minimum height of 15'. This work shall include the removal and disposal of all trees, stumps, brush, rubbish, roots, and other objectionable materials.