SHOALING PREVENTION: AN ALTERNATIVE TO DREDGING AAPA DREDGING FOCUS GROUP Ponce, Puerto Rico December 4, 2008
About SedCon Technologies Inc. Leading provider of shoaling prevention systems Based in California with regional service centers Sole source for patented SedCon Turbo System
Shoaling Prevention Concept Suspended Sediment Turbo Unit Tidal Currents Mud Bottom Jet Discharge
Synchronized with Tide Ebb Tidal Current Flood Tidal Current Turbo Units (4 Total) Dock Pump/Control House Shoreline
Benefits Full depth at all times Increased availability of berth Significant cost savings Dredging problems/risks eliminated
Typical System Layout Turbo Units (4 total) Pump/Control House Piping Loop
Turbo Unit Features Hydraulic motor & actuator Low maintenance design Zinc anode protection Anti-fouling coating
Dock Deployment Angled guide pile Mobile crane for raising & lowering Recessed valve boxes
Hydraulic Power Source Electric motor-driven pump Inline cooler & heater Biodegradable hydraulic fluid
Computer Controls PC controller I/O interface Solenoid-actuated valves Multiple sensors
Installation Sites CITGO Petroleum Corp. INVISTA SC State Ports Authority (2) Georgia Ports Authority (2) NuStar Asphalt Refinery U.S. Navy
Typical Costs Construction costs run about $2,000 per foot O&M costs run about $50 per foot per year
Regulatory Concerns Agitation dredging Water quality impacts Adjacent shoaling impacts Marine organism impacts Independent monitoring studies show no significant adverse impacts
SCSPA Columbus Street Terminal
Dual 125 hp Power Sources
Ten 36-Inch Turbo Units Guide shoe on H pile flange
Turbo Unit Detail
Estimated/Actual Cost Estimated Actual Engineering $70,000 $125,000 System Equipment $1,300,000 $1,400,000 Construction $2,790,000 $2,871,201 Testing $40,000 $40,000 Total $4,200,000 $4,436,201
Maintenance Costs $108,000 in 2007 $147,000 in 2008 Includes $100,000 in 2007 and $114,000 in 2008 for maintenance service contract
Federal Permitting Will increase Federal Channel Maintenance Will follow lead of State permit
State Permitting Ultimate disposition of material Potential for scouring Impacts to water quality (DO, turbidity, TSS) Impacts to marine life
Monitoring Program Upstream Sample Point Downstream Sample Point Ebb Flow Sample points upstream 300, downstream 300 and midpoint, 125 off face of dock 300 Shoreline 125 Dock
Soundings Plan View SC Ports Columbus Street Terminal 26 March 2007 Soundings -54.0--51.0-51.0--48.0-48.0--45.0-45.0--42.0-42.0--39.0-39.0--36.0-36.0--33.0 S5 S4 S3 S2 S1 N5 N4 N3 N2 N1 0 50 100 150 200 250 300 Sta -3-00 Sta -2-00 Sta -1-00 Sta 0+00 Sta 1+00 Sta 2+00 Sta 3+00 Sta 4+00 Sta 5+00 Sta 6+00 Sta 7+00 Sta 8+00 Sta 9+00 Sta 10+00 Sta 11+00 Sta 12+00 Sta 13+00 Sta 14+00 Sta 15+00 Sta 16+00 Sta 17+00 Sta 18+00 Sta 19+00 Sta 20+00 Distance From Dock (ft)
Soundings 3D View SC Ports Columbus Street Terminal 26 March 2007 Soundings -54.0--51.0-51.0--48.0-48.0--45.0-45.0--42.0-42.0--39.0-39.0--36.0-36.0--33.0-33.0-36.0-39.0-42.0-45.0-48.0-51.0-54.0 Sta -3-00 Sta -2-00 Sta -1-00 Sta 0+00 Sta 1+00 Sta 2+00 Sta 3+00 Sta 4+00 Sta 5+00 Sta 6+00 Sta 7+00 Sta 8+00 Sta 9+00 Sta 10+00 Sta 11+00 Sta 12+00 Sta 13+00 Sta 14+00 Sta 15+00 Sta 16+00 Sta 17+00 Sta 18+00 Sta 19+00 Sta 20+00 Depth (ft MLW) 0 75 150 225 Distance From Dock (ft) 300