§ 22-603. Minimum design standards.

(a)

Location.

(1)

The maximum height from top of cap to top of sand bottom of the water side of the seawall shall be five feet.

(2)

Drainage filter fabric shall be placed between sheet pilings and backfill material extending horizontally a minimum of four feet at the toe of the slope into the fill and fastened over the top of the whaler.

(3)

No structure shall be constructed within ten feet landward of a seawall.

(4)

No seawall shall be constructed within ten feet of an existing landward structure.

(b)

Preservative treatment.

(1)

All wood shall be chromated copper arsenate (CCA) pressure treated with retention values sufficient for intended use:

a.

Above ground ..... 0.25

b.

Soil or fresh water contact (non-structural) ..... 0.40

c.

Soil or fresh water contact (structural) ..... 0.60

d.

Piles—Soil or fresh water contact (structural) ..... 0.80

e.

Salt water contact ..... 2.5

(c)

Pilings.

(1)

Butt pilings shall be eight inches in diameter minimum with 2.5 treatment value, spaced six feet eight inches on center maximum, embedded five-foot minimum.

(2)

Sheet piles shall be two inches by eight inches dressed lumber minimum, with treatment value of 2.5 in salt water and 0.80 in fresh or brackish water, embedded four-foot minimum.

(3)

Timber wales shall be two inches by eight inches rough sawn minimum, with treatment value of 2.5 minimum.

(d)

Caps.

(1)

Cap lumber shall be two inches by eight inches dressed lumber minimum, with treatment value of 0.40 minimum, double side by side for top of cap and single member for face of cap.

(2)

Wood cap shall be stagger spliced.

(3)

Cap may be of reinforced concrete.

(4)

All wood to wood match-ups shall use a minimum of a 12 penny common galvanized nails, six inches on center.

(e)

Tiebacks.

(1)

Tieback shall be 5/8 -inch galvanized bar, ten-foot minimum, grade 40 (ASTM).

(2)

Tieback anchor blocks shall be concrete three feet by two feet by one foot, 2500 psi minimum.

(3)

Tieback rod shall have a six-inch (minimum) 90° bend or a galvanized or stainless steel cable clamp at anchor block.

(4)

Tieback shall be sloped to maintain 12-inch (minimum) cover at concrete anchor block.

(5)

Tiebacks shall be installed, one per butt piling, unless there is an obstruction. Anchor block shall be larger in area of obstruction.

(Ord. No. 98-44, § 3, 8-18-98)