Pacific Dredge & Construction performed maintenance dredging for the Moss Landing Harbor District in October 2019 through January 2020. Approximately 65,000 cubic yards (cy) of sediment were removed from Moss Landing Harbor. Of the Approximate 65,000cy dredged, 17,000cy was dredged from the north harbor with a hydraulic cutter suction head dredge and utilized a booster pump to place the sand on the beach as replenishment. The remaining 48,000cy in the South Harbor was dredged using two different methods; the hydraulic cutter suction head dredge with 10” Eddy Pump excavator attachment and with a barge mounted Liebherr material handler using a 3 cubic yard CableArm environmental clamshell bucket. The South Harbor material was disposed of at the designated SF-12 ocean disposal site via both pipeline and dump scows. The sediment in the harbor was removed to minimum elevations of -10’ and -12’ MLLW. Two 200cy dump scows and 8,000 ft. of 12” pipeline was utilized for this job.
Pacific Dredge & Construction (PDC) got awarded this project again and returned to Moss Landing during fall 2020 and reached completion before Jan 15,2021. Pacific Tugboat Service (PTS) provided their tugboat “Contender” to tow PDC 2,000 cu yds capacity scow to the disposal site (SF-14) offshore located at the Monterrey Bay. In-Harbor PTS supplied truckable tug “Cadet” and tug “S. Bass”.
The project consisted of the dredging of two reaches that were located in the Southern Harbor of Moss Landing. Dredging depth was -15 MLLW with 2 foot of allowable over-depth.
Reach 1 was mechanically dredged with our PDC 180 barge, crawler crane Manitowoc 4600 and combination of environmental clamshell bucket and extra heavy duty digging bucket. Approximately 16,000 cu yds was dredged from Reach 1 and disposed of offshore at the approved disposal site (SF-14) in Monterrey Bay.
Reach 2 was mechanically dredged with our PDC 180 barge, crawler crane Manitowoc 4600 and environmental clamshell bucket. Approximately 52,000 cu yds was dredged and disposed of offshore at the approved disposal site (SF-14) in Monterrey Bay.
PDC set up all standard and specific BMPs to comply with all required site conditions. One of the site conditions is to have a mammal monitoring qualified firm in charge of observing Southern Sea Otter and Tidewater Goby in a daily basis for the duration of the project.