INTERIM OPERATION PLAN (2017) - Project Updates
VIEW GRAPHIC: Beach Nourishment Progress Map (4/24/17 Update)
| PHOTOS - 4/24/17 from Station 109+00 (Greenville Ave.)
|Stationing Identification at Greenville Ave. Looking West|
|Deflector Plate 1|
|Deflector Plate 2
4/17/17 – As of this morning, the beach nourishment slurry discharge point was located near Station 97+00, or in between Money Island Drive and Wilson Ave. (see 4/17/17 progress map). Pictures below from the discharge site.
| PHOTOS (4/17/17)
|Station 97+00 Discharge|
|Station 97+00 Discharge looking west|
|Station 97+00 Discharge looking east|
|Station 97+00 Discharge looking east#2|
4/13/17 - Channel maintenance dredging continues with concurrent beach nourishment, the latter of which has just made the jump westward of the Oceanana Fishing Pier (see 4/13/17 progress map). Pictures below and please use the sand ramps over the dredge pipe when visiting Ft. Macon and Atlantic Beach this Easter weekend.
| PHOTOS (4/13/17)
|Oceanana Looking East|
|Oceanana Looking East #2|
|Oceanana Looking West|
|Oceanana Looking West #2|
| Oceanana Looking North
|Oceanana Looking North #2|
|Station 91+00 #2|
4/10/17 - Dredging/pumping operations resumed yesterday after last week's storm and as of this morning, discharge was located at Station 71+00 (see 4/10/17 update) and approaching the Oceanana Fishing Pier. To this effect below are pictures from the beach and the Pier.
| PHOTOS (4/10/17)
|Station 71+00 Labeled|
4/5/17 - Dredging/pumping operations have been suspended for the past couple of days (weather) and will remain so as this next storm approaches. Beach nourishment has reached Station 65+00, meaning approximately 4,000 linear feet has been completed to date (see 4/5/17 update). Great Lakes is using this down time to break down and re-establish the pipeline run down the beach (i.e., fix leaks, create better fits, etc.). ALSO, the U.S. Corps of Engineers received an additional $2 million for the Project as part of the FY 2017 budget process/supplemental Matthew funding. It is estimated this will yield an additional 167,000 cubic yards of excavated material that will be placed along a 3,500 linear feet stretch west of the Oceanana as depicted in the updated map. This may result in Great Lakes working past the April 30th environmental window, but the scope of work should be mostly constrained to the demobilization process at this point (i.e., they should be nearly completed with actual dredging/pumping by April 30th).
3/31/17 - Great Lakes has made some nice progress their first week of dredging the Harbor (~2,800 linear feet of beach nourishment – see March 31, 2017 Update Map). We will try to provide a cubic yardage estimate for our next update. Great Lakes is being paid for the excavated volume from the channel – not the volume surveyed on the beach. This LINK is a survey of the dredging area at Beaufort Inlet (be mindful of the north heading when viewing the document – shoaling hotspot is near Buoy “16A”).
| PHOTOS (3/31/17)
|Y-Valve & Gate|
|Discharge & Flushing|
|Station 53+00 looking East|
|Station 53+00 looking West|
3/26/17 - Great Lakes Dredge & Dock initiated dredging of the Morehead City Harbor with concurrent beach nourishment along Atlantic Beach on Friday (3/24/17), and have progressed to Station "33+00" (see update map). Below are a few pictures including the water-based booster pump and the dredge Illinois.
| PHOTOS (3/26/17)
|Dredge & Booster|
|Pipe heading to AB|
SUMMARY & HOW TO INTERPRET THE PROGRESS MAP
for Interim Operation Plan
Great Lakes Dredge & Dock will be utilizing their cutterhead-suction pipeline dredge, the Illinois for the 2017 Interim Operation Plan effort. A cutterhead-suction dredge utilizes a crane situated on a barge that positions the cutterhead, which looks like a gigantic drill bit, along the seafloor. The cutterhead agitates the sandy bottom, and the resulting slurry of sediment and water is subsequently suctioned into a long tube transitioning into a pipeline that can be extended to a specific target area (beach, upland disposal site, etc.). Pipeline dredges are usually not self-powered, but are towed to the dredging site and secured in place by special anchor pilings, called spuds. Additionally, a water-based booster pump (GLDD #4) will be utilized for the Interim Operation Project to provide additional power to pump dredged sand for a maximum distance of approximately 4.25 miles extending from the channel westward close to the Circle.
Project engineers use “stations” positioned along the beach to monitor construction progress and to verify in-place volumes of sand placed on the beach by dredging contractors. The progress map above provides a detailed view of the project reach to be completed in winter/spring 2017 with the location/identification of the station numbers. The shaded areas in red represent the completed portions of the project and will be updated on a weekly basis throughout the construction.
The station numbers included in the progress map conveniently correspond to thousands of linear feet along the beach. For instance, the distance between station “25+00" and “85+00” on the graphic above is 6,000 feet. If you visit the beaches of Ft. Macon and Atlantic beach this winter, you may see wood or metal stakes at the base of the dunes that will identify these station numbers by 100 feet intervals as “33+00", “34+00”, etc.
The total estimated volume of shoal material to be excavated/dredged from the Morehead City Harbor is 667,000 cubic yards (cy) = 500,000 cy + 167,000 cy supplemental - mostly from the area known as the "Cutoff". As a mental image, a loaded dump truck can hold roughly 12 cy (wet) or possibly 15 cy (dry) of sand. The contract price is $9,435,825 ($7,435,825 +$2,000,000 supplemental) and the average fill density is expected to be close to 70 cy/ft = 667,000 cy/9,500 linear feet. The environmental window for the effort closes on April 30, 2017, and the contractor is required to complete the project by this date.