L - Walls BEFORE AFTER DESCRIPTION: 11/16/2018 L - Walls Face Base Angled Splash Plate Key BEFORE DESCRIPTION: Patented Waterfront sea walls or bulkheads Applications: Bank stabilization Retaining Wall 4 tons for a section and 4.7 tons for a corner 8’ long X 5’9” wide X 7’4” high 5,000 psi - DOT bridge grade concrete Installation Base: 2007 Number of sights36 Cumulative feet 7,700 First Installed 1994 AFTER Sources: (1) http://www.seament.biz/,

T - Walls BEFORE AFTER 11/16/2018 DESCRIPTION: Groins (placed perpendicular to bulkheads) Applications: To trap and hold sand Low Bulkhead Retaining wall 1 Ton each 10’ long X 2’6” wide X 2’9” high Type A unit has angled cut-out to fit up against bulkhead Type B unit is a plain rectangle Type C unit has tapered seaward end (prevent eddies) 5,000 psi - DOT Bridge Grade Concrete Installation Base: 2007 Number of Sights28 Cumulative Feet 3500 First installed in 1994 AFTER Sources: (1) http://www.seament.biz/

Sealogs DESCRIPTION: 11/16/2018 Mat of concrete logs wired together Applications: To form submerged end of boat ramps To provide scour protection from waves 160 pounds each 8’ long X 4’ wide mat of 8 logs 5,000 psi - DOT Bridge Grade Concrete Installation Base: 2007 Number of Sights6 Cumulative Feet  84 4’x8’ mats First installed in 1995 Sources: (1) http://www.seament.biz/

Hex Box segmented breakwater unit 11/16/2018 Aug 9, 2007 Aug 14, 2007 Aug 22, 2007 May 23, 2008

Hex Box Characteristics 11/16/2018 Hex Box Characteristics Dimensions: 8’ long, 3’ to 7’ wide, height 4’ to 6’ Weight varies with height, from 3.6 to 4.5 tons. 11% porosity of wall face from 12” Dia. holes gives wave reflection coefficient of .3 with a 25 foot wave length. This is less than a 1:2 slope rock breakwater and does not consider the extra effects of the angled face on reducing reflection effects. No steel in concrete, Synthetic structural fibers used for reinforcement of the 5000 PSI concrete. Tongue and groove slots in ends lock each box to its neighbor as well as two concrete pins that are driven down through the floor of the box into the riverbed to hold their position.

Hex Breakwater Layout 11/16/2018 The inside of a hex box fills with sand and allows recruitment of plants and animals in a sunlight, calmer environment. Hex boxes have a higher replacement habitat value than rock, while allowing animals to pass through the large holes in the box’s walls.

11/16/2018 The Seament Sill box is a 8’ long open topped box, height from 2’6” to 4’ and width of 3’ to 4’6”. It weighs from 1 to 2 tons empty and can be floated into position without damaging existing marsh or SAV. The open top box allows SAV and grass to grow inside the box and the large holes allow animals to easily move between the water and marsh. The wave reflection of the box, with the holes in the face should be equal or lower than a comparable stone sill of 2 to 1 slope.