[HISTORY: Adopted by the Mayor and Council of the Borough of Wanaque 11-17-1986 as Ord. No. 7-0-86. Amendments noted where applicable.]
GENERAL REFERENCES
Repair of buildings — See Ch. 63.
Uniform construction codes — See Ch. 67A.
Flood damage prevention — See Ch. 74A.
As used in this chapter, the following terms shall have the meanings indicated:
RETAINING WALLS
A structure designed and constructed to provide the lateral resistance necessary to prevent horizontal movement of the vertical plane of a mass of soil and which acts as an opposing element to the tendency of the soil to displace laterally to form a natural slope.
A. 
Retaining walls more than 30 inches in height above grade may not be constructed in locations within the sight triangle area formed by the intersecting street/driveway lines and a straight line joining said street/driveway lines at points which are 30 feet distant from the point of intersection, measured along said street/driveway lines. Where, due to topographic (existing or proposed) or other conditions, the application of the above-stated rules do not produce a clear visibility above 4 1/2 feet at the center lines of the streets adjacent to the above-mentioned triangular area, plans for the developing of such triangle shall be subject to the approval of the jurisdictional authority.
B. 
Notwithstanding the above provision the maximum height permitted for any retaining wall shall be 10 feet.
C. 
Notwithstanding the above provisions, no retaining wall shall be erected, altered or constructed exceeding 30 inches in height above the existing or proposed grade when located within 15 feet of any street right-of-way line.
Notwithstanding the above provisions, the use of terracing whereby a series of two or more parallel retaining walls are constructed behind one another with stabilized embankment slopes between them shall be limited as follows:
A. 
The horizontal offset distance between the back of a lower wall and the front of an upper wall for two adjacent walls shall not be less than the vertical distance measured from, the finished grade at the bottom of the lower wall to the finished grade at the bottom of the upper wall.
B. 
The embankment slope between the lower and upper wall shall not be steeper than two horizontal to one vertical and shall be stabilized.
Notwithstanding the above provisions, any retaining wall over four feet in height and any terracing utilizing retaining walls where the summation of the heights of each retaining wall utilized exceeds four feet in height shall be required to be designed by a licensed professional engineer registered in the State of New Jersey. In addition, details and design calculations shall be submitted to and approved by the Borough Engineer prior to the issuance of a building permit. The design calculations and details shall include and address but not be limited to:
A. 
Materials being used for the retaining wall and backfill.
B. 
Soil-bearing capacity.
C. 
Frictional resistance and passive soil pressures acting on the wall with their magnitude and location.
D. 
All lateral forces and their magnitude and location that can occur on the wall.
The New Jersey Uniform Construction Code shall govern the design and construction of the wall (current B.O.C.A. Code).
In the event that the retaining wall is part of the site work of a one- or two-family dwelling being constructed, the plans and specifications for the retaining wall shall be part of the overall construction permit.