T ensar Earth Technologies(TET) improves property values by providing technology-driven earthwork solutions. In additionto roadway and foundation improve-ment, reinforced slopes and retainingwalls, TET produces a number of sys-tems specifically designed for protect-ing property in coastal and waterwayenvironments.

TET has worked on several projectsdesigned and/or administered by theUS Army Corp of Engineers (USACE)and other federal and state agenciessuch as state Departments of NaturalResources (DNR), Departments ofEnvironmental Protection (DEP), and theU.S. Fish & Wildlife Service. Each projectpresents its own unique challenges.

Sunny Isles Beach Renourishment

Application: Submerged Foundation Mat

Owner: Miami-Dade County Florida

Engineer: USACE Jacksonville District

Installation Date: Summer 2001

Two near-shore, 375-foot breakwaterswere constructed in 8 to 11 feet of waterwith 3.5 to 6.5 ton armor stone placeddirectly on a 12-inch-thick marine mattress foundation. The Triton Systemwas selected based on its successfultrack record of scour and settlementprotection when used in similar applications. The success of this projectis attributed to the systems ease of construction and accurate placementof a high-quality bedding layer.

SUCCESSFUL TRITON PROJECTS DESIGNED BYFEDERAL AND STATE AGENCIES

TritonSystems

COASTAL ANDWATERWAY

SYSTEMSHolly Beach Breakwater

Application: Submerged Foundation Mat

Owner: Louisiana Department ofNatural Resources (LA DNR)

Engineer: Coastal Planning &Engineering Boca Raton, FL

Installation Date: Spring 2002

The Holly Beach project took place nearshore along the coast of Louisiana. TheEngineer selected the Triton MarineMattress System as the foundationsolution after reviewing several othersuccessful applications of the system.The design improved constructibilityand long-term performance of thebreakwater foundation. After fillingand installing only a few mattresses,the Contractor and the LA DNR were immediately impressed with the overall performance, labor, and timesavings realized by using the system.

Barnegat Inlet LighthouseRevetment

Application: Submerged Foundation/Filtration Mat

Owner: Ocean County, NJ

Engineer: USACE Philadelphia District

Installation Date: Winter 2002

The project involved placing 500- to800-lb armor stone in a scour hole nearthe base of Barnegat Lighthouse to prevent erosion that was threateningthe lighthouse foundation. The problemof swift tidal currents would havemade placement of a separate geotextile

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Armor Stone

Geotextile/Fabric can bepre-attached to bottom of mattress unit

12 in. Triton Marine Mattress

Typical Cross Section of Breakwater using Triton Marine Mattresses at the foundation.

2004, Tensar Earth Technologies, Inc. TENSAR and TRITON are registered trademarks. Certain foreign trademark rights also exist. The products and/orapplications illustrated herein are covered by one or more of the following U.S. patents: 5156495, 5419659, 4590029, 4743486, 5595460, 5632571. OtherU.S. or foreign patents may apply or are pending. Final determination of the suitability of any information or material for the use contemplated and itsmanner of use is the sole responsibility of the user. Printed in the U.S.A.

Tensar EarthTechnologies, Inc.5883 Glenridge Drive, Suite 200

Atlanta, Georgia 30328800-TENSAR-1

info@tensarcorp.comwww.tensarcorp.com FLY-USACE-1.04

difficult or impossible. The TritonMarine Mattress System was speciallymodified for this project. A 4-inch-thickfilter mattress was fabricated usingTensar BX1500 Geogrid and lined withgeotextile encapsulating the stone fill.This solution facilitated the successfulplacement of the geotextile and provided a high performance beddingand filtration layer.

Stratford Army Engine PlantCauseway Protection

Application: Coastal Revetment/Contaminated Sediment Cap

Owner: U.S. Department of the Army

Engineer: USACE New England District

Installation Date: Fall 2001

Working on a coastal revetment projectis not uncommon for the Triton Systems.However, when that revetment systemis also the key component of a contaminated sediment cap, certainchallenges present themselves. Thiscauseway is a peninsula that rises upfrom a small tidal flat and extends intoLong Island Sound at the point wherethe Housatonic River joins the Sound.It is exposed to river flow and eddycurrents made more severe by a jettyabout 100 yards up stream of the tip ofthe peninsula. Protection from erosiveforces, including wind-driven waves

and tidal fluctuation, was needed. The designer, Harding ESE (Mactec) ofPortland, Maine, obtained a special variance permit from the CT DEP toinstall the 12 inch marine mattress as asediment cap in lieu of a 4-foot layer ofimported fill. Due to the environmentalsensitivity of this job, the Triton MarineMattresses were held to higher QCstandards than would normally beexpected on a typical revetment system.The Contractor, Owner, and Engineerwere all pleased with the overall performance of the Triton MarineMattress System.

Other Successful Agency Projects Anahuac NWR Dike Repair

U.S. Fish & Wildlife

Cape May Point Dune Stabilization NJ DNR

Ft. Clinch State Park FL DEP

Peanut Island Wetlands Enhancement USACE Jacksonville District

Point Mugu NAS Seawall Repair Department of Navy Facilities Engineering Command (NAVFAC)

Rio Matilde Riverbank Protection USACE Jacksonville District

TritonSystems

COASTAL ANDWATERWAY

SYSTEMS

Photo by: Bill Schwartz & Associates