Ponce De Leon Inlet, North Jetty Rehabilitation and Aid to Navigation Replacement, Volusia County, Florida

Description of Project: Work consists of repairs to restore the North Jetty at Ponce de Leon Inlet in Volusia County, Florida. Repairs will require substantial moving and manipulation of both new and existing stones to obtain the required interlocking within the tolerances provided. The North Jetty is approximately 3,855 feet in length with a height of 7.2 feet above mean lower low water (MLLW). Mobilization of equipment and the construction necessary to repair the jetty shall be water-based and require the use of marine construction methods and equipment. Work also consists of constructing a new concrete base for a U.S. Coast Guard Aid to Navigation (ATON) at the seaward extent of the existing jetty crest, and constructing and attaching a new ATON to the newly constructed base. Base construction and placement will require removing and resetting surrounding existing armor stone so the base is meshed and interlocked with the surrounding armor stone. Specific Project Challenges: Environmental Conditions: The Ponce de Leon Inlet, North Jetty is adjacent to a highly dynamic marine environment that results in hazardous navigation. The water depth at the seaward extent of the jetty is approximately 30 feet MLLW. Stone Requirement: Armor Stone A Stone shall be well graded from 4,000 pounds to 12,000 pounds with fifty percent (50%) of the stone greater than 8,000 pounds. Armor Stone B Stone shall be well graded and from 10,000 pounds to 18,000 pounds with fifty percent (50%) of the stone greater than 14,000 pounds. Armor Stone C Stone shall be well graded and from 16,000 pounds to 24,000 pounds with fifty percent (50%) of the stone greater than 20,000 pounds. Unit Weight 165 pounds per cubic foot. Size and Shape Stone delivered under this requirement shall be blocky in shape with sharp angular edges with its greatest dimension not greater than three times its least dimension (3:1 ratio). The term blocky shall be understood to mean cuboidal (roughly cubical in shape). The term angular shall be understood to mean that the blocky stone shall have sharp, clean, angular to sub-angular edges at the intersections of relatively flat faces. All other stone shapes, such as wedges and/or pyramids, or stones having a triangular and/or pyramidal cross-section, will be rejected. All boulders and parts of boulders will be rejected, with a boulder being defined as any rounded stone not having sharp, clean, angular to sub-angular edges. Placement of Armor Stone Armor Stone shall be placed within the limits and elevations as indicated on the contract drawings, including allowance for tolerances, to provide for required thickness of armor stone Armor Stone shall be placed individually by equipment suitable for lifting, manipulating in all directions (e.g. grapple), and placing stone of the size specified to the lines and grades as shown on the contract drawings, including allowance for tolerances. The equipment used in placing the Armor Stone shall also have the ability to place the armor stone over its final position before release and if necessary pick up and reposition the stone. Dragline buckets and skips shall not be used in placement. Moving stone by drifting or manipulating down the slope will not be permitted. Stones shall be brought to rest before releasing and shall not be dropped. Armor Stone shall be selected with care as to size and shape and key-in, meaning that the Armor Stone selected are able to be set in contact with all adjacent Armor Stone so that the void space between adjacent stones are as small as the character of the armor stone will permit. Void space shall also be kept to a minimum. Chinking of void space using chinking stone or other material is not permitted. New Armor Stone (reusable existing armor stone are excluded) shall be generally rectangular in cross section, the least dimension of any stone not being less than one-third its greatest dimension. Armor Stone shall be individually keyed and fitted in the structure such that each stone is in contact with all adjacent Armor Stone. Repair areas shall blend smoothly with adjacent non-repair areas of the jetty. Non-repair areas shall be adjusted up to two armor stone diameters away from repairs in order to provide a smooth transition between repair and non-repair areas. Refer to the contract drawings for locations of crest elevation transitions and crest width transitions. Continuous joints, where the vertical joints are not staggered and is continuous from the lower stone layers to the upper stone layers, are not allowed. In general, the long axis of each stone shall be placed perpendicular to the axis of the structure and slope downward toward the center of the structure. The Contractor shall begin placement at the bottom of the slope. Chinking of void space using smaller stones or other material is not permitted. New and reset existing Armor Stone shall be placed on a prepared stable surface using equipment suitable for handling the sizes of armor stone indicated without damage to either new or existing Armor Stone. Avoid creating flat final surfaces by using smaller stones, as the smaller stones will eventually be moved out of the structure creating degradation and movement of the larger stones. Avoid placing the largest face of the outermost stones parallel to the design lines and grades of the structure. The Contractor shall make an effort to interlock armor stone placement with the existing construction that is not a part of the repair work of this contract. The Contractor shall anticipate that substantial re-handling of individual Armor Stone after initial placement will be required to achieve the requirements of subparagraph titled "Placement of Armor Stone". The finished work shall be a well-distributed mass, free of pockets of either smaller or larger stones, having a minimum of voids, and with a maximum of interlocking stones. The mass of stone shall follow the lines and grades as shown on the contract drawings.

Division 31 -	Earthwork, Erosion and Sedimentation Controls.
Division 33 -	Utilities, Storm Drainage Utilities, Ponds and Reservoirs.
Division 35 -	Waterway and Marine Construction, Shoreline Protection, Waterway Construction and Equipment.