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Dredging

Dredging Project Profiles
 

East Basin Dredging - 105
Owner: San Diego Unified Port District
Start date: 7/3/1984
Finish date: 11/8/1984
Value: $875,023

This project was located in San Diego Bay and the work consisted of dredging and placing shoreline rock revetment at the site of a proposed new marina. The 69,000 cubic yards of dredging was performed using a 6 cy clamshell dredge to load a 1500 cy dump scow for disposal at sea. The shoreline slopes were trimmed and the 17,000 tons of rock revetment was placed using a large excavator. This dredging was difficult because of the hard native materials and the requirement for a shallow cut over a wide area. EEvia hydraulic cuttersuction dredge 250,000 Cubic Yards (CY) of clay material and fill a 60 foot deep upland valley disposal site.

Restore Water Capacity to Lake O'Neill - 180

Project: Restore Water Capacity to Lake O'Neill
Owner: U.S. Navy
Start date: 6/10/1991
Finish date: 1/11/1994
Value: $1,657,128

Excavate via hydraulic cuttersuction dredge 250,000 Cubic Yards (CY) of clay material and fill a 60 foot deep upland valley disposal site. Project proved difficult, due to the fact that it was virtually impossible to meet water quality requirements with the return water back to the lake due to the long settlement period required of the clay dredge material as well as the high moisture content of the soil once the solids were remove from suspension. We devised a material drying plan, incorporating drying, mixing and spreading over a longer time frame, which resulted in ability to meet the water quality and disposal fill stabilization project specifications.

Chollas Creek Dredging- 255

Project: Chollas Creek Dredging
Owner: U.S. Navy
Start date: 5/23/1997
Finish date: 11/14/1997
Value: $3,006,475

Maintenance dredging of 100,000 CY of sandy muck, excavating with a derrickbarge/clamshell dredge and loading a pocket scow barge and offloading with an onshore, longreach hydraulic excavator, and loading trucks for off base upland disposal. The project also required the building of a confined disposal facility (CDF), for dewatering and temporary storage of the dredge spoils, adjacent to the scow offloading area. By employing the use of watertight, sidedump tractor/ trailer hauling units, we were able to skip the intermediary step of using the CDF, resulting in a quicker completion, and less impact on Naval Operations.

Maintenance Dredging @ Oceanside Harbor - 295

Project: Maintenance Dredging @ Oceanside Harbor
Owner: U.S. Army Corps of Engineers
Start date: 1/7/2001
Finish date: 3/31/2003
Value: $5,246,642

Three year maintenance dredging with a hydraulic cuttersuction dredge. Work includes mobilization, dredge and pump 5000 lineal feet and spread 200,000CY of beach quality sand and demobilization, three times. The scheduling of dredging and subsequent confirmation surveys is critical on this project as the harbor is one of the most hazardous to dredge as well as to navigate during rough seas, in southern California.

Waterfront Improvements - 261

Project: Waterfront Improvements
Owner: U.S. Navy
Start date: 1/27/1998
Finish date: 7/22/1999
Value: $11,706,242

This project included structural steel upgrades to the steel superstructure of the old 1920 Navy Fuel Pier.  Old product lines were removed from under the pier and new product lines were installed under and on top of the pier.  Concrete restoration work was performed on the concrete portion of the pier and at the existing quaywall.  Shoreside utilities were upgraded.  Revetment work was performed along the shoreline.  A new fendering system was installed. The underside of the structural steel portion of the pier was sandblasted and painted.  The shoreside fueling station was demolished and replaced with newer double walled product lines.  Maintenance dredging was performed and the material was taken to an upland disposal facility.  Challenges on this job included working around a very active fueling depot for the US Navy were no work could be performed during fueling and fuel unloading operations.  Additionally, 75% of the work was performed under the pier were work was performed from rafts, suspended scaffolding and boats.  Containment of spent sandblast grit was challenging as well.

Patrol Coastal Pier 21 and
Berth Maintenance Dredging 62

Project: Patrol Coastal Pier 21 and Berth Maintenance Dredging
Owner: Naval Amphibious Base, Coronado, CA
Start date: 10/31/1997
Finish date: 12/2/1998
Value: $4,043,793

Original project consisted of removing the existing pier, dredging a new mooring basin, and construction of a new boat ramp and pier. The existing material to be dredged was tested and determined to be too contaminated for offshore disposal, so we had to secure an upland disposal site for the 15,000CY of silty sand dredge spoils. The dredging operation consisted of a floating clamshell dredge loading into a material barge consisting of a wall enclosed flat barge. When full, the material barge was towed to an offloading wharf at Naval Station San Diego. Once moored, the material barge was offloaded via long-reach excavator and loaded directly into leak-proof, semi end dump trucks. Once loaded, the trucks hauled and dumped the dredge spoil at the approved upland disposal site. During the dumping and spreading operation at the upland disposal site, unexploded Navy ordnance was encountered. Based on our experience with unexploded ordnance in dredge material, we devised a plan to relocate the material to a new secure site. The material was then screened to remove the unexploded ordnance. Thereafter, the dredge spoils were safely and legally disposed of, as were 15 rounds of unexploded ordnance.

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