General Requirements. All storm drainage facilities for residential developments shall be designed and constructed in accordance with the Residential Site Improvement Standards (N.J.A.C. 5:21 et seq.). All other development shall be constructed in accordance with the applicable requirements of the Standard Specifications. The developer or his engineer shall submit complete calculations, specifications, plans and details for all proposed storm drainage facilities. Any field samples or laboratory tests required to document conclusions of such calculations shall be performed to the sole expense of the developer.

Storm Drain Pipe. All storm drain pipe shall be either slip joint type reinforced concrete or corrugated metal pipe meeting the requirements of the Standard Specifications and of all thickness sufficient to meet the proposed conditions of service; but in any event, no wall thickness less than Class 3, Wall B for concrete pipe or Number 14 gauge for corrugated metal pipe shall be allowed. No concrete pipe may be laid on grades exceeding 8%. Concrete pipe below thirty-six (36") inches in size will be joined using a preformed bituminous mastic pressure type joint sealer or other equivalent approved joint. All corrugated metal pipe shall be fully bituminous coated with paved invert and of a gauge meeting the requirements of the Standard Specifications sufficient for the proposed service. All storm drains shall be tangent between inlets, manholes or other structures. Prior to laying any storm drains, the bottom of all trenches shall be inspected by the Borough Engineer. Should the engineer determine that the trench is unsuitable for the placement of the pipe, the developer shall take all the necessary action to remove or eliminate any unsuitable conditions. These may include, but are not limited to: excavation and backfill with suitable material, placement of bedding material, construction of pipe graters or other actions necessary to remove all unsuitable conditions.

Types of Inlets. All street inlets shall be New Jersey Department of Transportation Standard Type B. All yard inlets shall be Standard Type A or B. Casting heights on any streets shall be two (2") inches greater than the specified curb face and the gutter shall be properly transitioned approximately ten (10') feet on either side of the inlet.

Headwalls. All pipe terminations shall be provided with poured concrete headwall, precast concrete end sections or corrugated metal end sections in accordance with the approved engineering drawings submitted with the site plan. Poured concrete headwalls shall be wing type headwalls in accordance with the Standard Construction Details.

Inlets and Manholes. Inlets and manholes shall be constructed where required in accordance with the requirements of the Standard Specifications and Standard Construction Details.

Open Channels. Open channels shall be designed to contain the required flow and shall have a design velocity low enough to prevent erosion. The minimum easement for open channels shall be the maximum design top width of the channels plus twenty-five (25') feet rounded to the next highest five (5') foot increment. The excess easement area shall be provided offset to that side of the channel most convenient for use by maintenance crews. The minimum distance between the channel top edge and any easement line shall be five (5') feet. Excess velocity in open channels must be controlled by sod, riprap, paving, ditch checks or other suitable methods. Changes of direction in open channels must have a minimum radius of eight hundred (800') feet or be adequately paved or riprapped.

Guardrail and railing shall be placed at all drainage structures where the interest of pedestrian or vehicular traffic safety would dictate. The Planning Board may require that any open channel or other than natural occurring streams, be fenced with four (4') foot high chain link fencing if the banks of the channel are steeper than one (1") inch vertically for every three (3") inches horizontally in either (1) the total depth of the channel exceeds four (4") inches or (2) the channel would be expected to have a depth of flow greater than three (3") inches more than once every 10 years. For maintenance purposes, gates may be required by the Planning Board at approximately two hundred (200') foot intervals.

Retaining walls installed in slope control areas shall be constructed of heavy creosote timber or logs, or reinforced concrete, other reinforced masonry or of other acceptable construction and adequately designed to carry all earth pressures including any surcharges. The heights of retaining walls shall not exceed 1/2 of the horizontal distance from the foundation wall of any building to the face of the retaining wall.

The developer shall take all necessary precautions to prevent any siltation of streams during the construction of the site. If required by the Planning Board as a condition of approval or by the Planning Board Engineer during construction, the developer shall provide adequate provisions to prevent all deposits of silt or other eroding material in any stream or water course. Such provisions may include, but not be limited to, construction and maintenance of siltation basis or hold ponds throughout the course of construction.