Fences may be constructed of natural material in its living state or the following factory- manufactured materials.
   (A)   Wood. Subject to the following conditions or limitations:
      (1)   Wood which has a natural resistance to decay or treated wood may be used;
      (2)   Wood in its natural state shall not be used;
      (3)   Plywood or other solid sheeting materials which are two feet or wider shall not be permitted;
      (4)   Spacing of support posts on wood fences shall be no more than eight feet on center. Such supports shall be embedded below grade not less than three feet unless the post is embedded in concrete. If concrete is used, the post may be embedded below grade no less than two feet and one cubic foot of concrete;
      (5)   (a)   All wood in contact with the ground shall be treated; and
         (b)   Chemical retention shall meet the American Wood Preservers Association Standard C23-92 for round poles and C24-93 for sawn timber. In no case shall there be less than 0.6 pounds of chemical retention per cubic foot of material.
   (B)   Hedges. Subject to the following conditions or limitations.
      (1)   Hedges shall not be located in the first 25 feet of any required front yard on an interior lot.
      (2)   Hedges located on a corner lot shall not be located within 25 feet of the property corner abutting the right-of-way intersection.
      (3)   All hedges shall be maintained in a neat and orderly fashion and must be kept clean of all trash and other materials.
      (4)   When the City Forestry Board advises the Planning Commission of a dead hedge, the property owner shall be ordered to remove said hedge within 30 days of notice given to the owner.
      (5)   When the Police Chief finds a hedge is causing a public safety hazard (visibility), the hazard shall be removed.
   (C)   Metal. Subject to the following conditions or limitations.
      (1)   (a)   Metal fences may be of any manufactured metal product except barbed wire.
         (b)   An exception to the above shall exist for security fences when approved by the City Planning Commission. Security fences may be constructed with barbed wire if the lowest strand of barbed wire is not less than eight feet from the existing grade.
      (2)   Spacing of support posts for metal fences shall be no more than eight feet on center.
      (3)   All supports shall be embedded in not less than one cubic feet of concrete and extend below grade a minimum of two feet.
   (D)   Concrete, masonry, or rock. Subject to the following conditions or limitations.
      (1)   Concrete, masonry, or rock fences may be constructed of cast in place concrete or any manufactured concrete product.
      (2)   Fences or walls constructed of concrete products shall be designed with reinforcement. Such design shall be in compliance with Building Code and approved by Engineering and Inspections Office.
   (E)   Poly vinyl chloride. Subject to the following conditions or limitations.
      (1)   Fences constructed of PVC must meet or exceed the following ASTM requirements:
         (a)   ASTM D256 Izond Impact (23°C: five feet lbs.) (0°C: two feet lbs.);
         (b)   ASTM D638 Tensile Strength;
         (c)   ASTM D648 Deflection Temp;
         (d)   ASTM D695 Compressive Yield (8,780 psi);
         (e)   ASTM D696 Thermal Expansion; and
         (f)   ASTM D732 Shear Strength (6,870 psi).
      (2)   Posts for PVC fencing shall not be spaced more than eight feet.
      (3)   Posts shall be installed not less than two feet below grade and imbedded in not less than one cubit foot of concrete.
   (F)   Other. Other materials may be approved by the Planning Commission and the engineering office when it has been determined that the alternate material meet or exceed the requirements of the above materials.