Aquatic Filter Barrier Technology and the Marine Life Exclusion System™

1. Aquatic Filter Barrier Technology and the Marine Life Exclusion System™ – “5 - Slide Overview” AECOM August 2009

2. Marine Life Exclusion SystemTM (MLES)The Gunderboom MLES Five-Slide Review - 1 From 1986 engineered filter barriers for containing dredge-derived sediments, • Gunderboom has designed, fabricated, installed and maintained aquatic filter barrier systems that • Function in marine, estuarine and freshwater environments to • Control sediment, bacteria, chemicals, underwater sound, and, for the MLES, to exclude fish, fish eggs, larvae and other biota and debris from water intakes. 1995 MLES development led to 2004 successful deployment for a 600 cfs water intake on the Hudson River and for a desalination plant on the Taunton River starting in 2008. Clockwise from top: Contaminated Particulate Control System (seals to bottom; Reservoir Protection System with patented bird deterrent; 1600-ft MLES on Hudson R; 400-ft MLES Taunton River; 350 ft RPS on pallet, pre-deployment.

3. Marine Life Exclusion SystemTM (MLES) The Gunderboom MLES Five-Slide Review - 2 Gunderboom MLES screening technology is unique. Using specialized, durable, high-permeability fabrics as the primary, physical screening mechanism, Gunderboom has developed system designs that range from: • floating, anchored curtains (with bottom seal skirts), to • cartridge arrays, • floating intake filter pools, • fixed panels and • various “pipe-end” structures. Clockwise from upper right: Fixed panel system; anchored floating system profile view; floating intake filter pool, 45’ x 15’ x 12’ deep); 13 cfs cartridge system, 150-ft floating anchored system for pilot test.

4. Marine Life Exclusion SystemTM (MLES) The Gunderboom MLES Five-Slide Review - 3 Gunderboom MLES screening devices have distinct advantages. • Large fabric screen area yields approach velocities of ~0.02 fps– 95% below other screens and agency accepted levels. Enables even small fish larvae to swim away from the AFB. Planktonic eggs not harmed (3rd-party lab studies (EPRI, Alden) used 2X MLES flow rate and multiple hours of exposure with minimal to no impact on survival. • High exclusion rates exceeded permit requirements- 4-year average >87% vs. 80% requirement at 600 cfs; first year reported at 92% for 30 cfs MLES. • Automatic AirBurst™ cleaning releases any deposits from the filter material and helps prevent biological fouling. • Fabric Filter panels designed for easy cleaning, repair or replacement and are relatively inexpensive. Upper to lower: “standard” Gunderboom MLES, non-woven polypropylene fabric, 150 micron AOS with 0.5 mm perforations added, newer “G-Weave” woven fabric; 72-hr survival fish egg and larval test apparatus; automated AirBurst™ cleaning cycle, 2 (of 4) valve simultaneous burst.

5. MLES Performance Specifications The Gunderboom MLES Five-Slide Review - 4 • Size Of Organism Excluded: • “Typical” fine-mesh system (0.5 mm apparent opening size) excludes life stages ≥0.6 mm. For larger organisms, gain higher flow per square foot of fabric. Can design for smaller, such as nuisance species larvae <300 microns. • Screen Approach Velocity: • Typical system (0.6 mm size exclusion) ≤0.02 fps approach velocity. • Fouling: • Minimal fabric susceptibility to most fouling taxa. Pressurized air released between fabric layers for cleaning is added deterrent. • Currents: • 3+ knots demonstrated long term. Systems also in velocities up to 6 knots • Depths: • Have operated system with vertical filter fabric up to 52 feet deep. Special designs for shallow applications. • Tidal/River Level Range: • >10 feet semi-diurnal tides demonstrated long term. Design also for flood and low flow conditions.

6. MLES Considerations during Design The Gunderboom MLES Five-Slide Review - 5 • Intake Design: • Available areas & existing structures utilized • MLES structural requirements addressed a variety of ways • System Size – Required Filter Area Depends On: • Target size and seasonality of organism to exclude • Flow requirements of facility • AirBurst Cleaning And SCADA System Requirements • Instrumentation for automatic operation • Integration with wedgewire automatic cleaning • Real-time operations and data download via remote access • Environmental Conditions • TSS/turbidity • Sudden water level changes • Availability of cross-flow • Seasonal differences Top: For floating systems, the bottom seal is critical for exclusion. Bottom: Gunderboom’s Flow Test Apparatus (FTA) is used to acquire engineering data on effectiveness, flow capacity, cleaning cycles and fabric selection.

7. Gunderboom Patents • Floating Containment Boom PCS Patent No. 5,102,261; Containment/ Exclusion Boom and Methods of Using the Same (MLES) Patent No. 6,485,229; Containment/ Exclusion Boom with Bird Deterrent U.S. Patent No. 6,514,010; Boom System and Its Use to Attenuate Underwater Sound Or Shock Wave Transmission Patent No. 6,567,341; Panel Anchoring System For Boom Installation U.S Patent No. 6,848,861; Boom Curtain with Zipper Connections and Method of Assembling Boom Patent No. 6,739,801; Boom Curtain with Expandable, Pleated Panels, Containment Boom Containing the same, and Use There Patent No. 6,743,367; Containment/ Exclusion Barrier System with Infuser Adaptation to Water Intake System U.S. Patent No. 6,843,924; Attachment for use With Stockpiling Barge and Method of Filtering Runoff Water Therefrom (Gundersock) U.S Patent No. 6,857,819; Patents Pending