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Dredge and Cap

Pacific Pile & Marine has the specialized equipment and capabilities to perform a variety of dredging and capping services.


PPM owns and operates an extensive range dredging equipment that can be configured to perform standard dredge operations to environmental remediation and shoreline restoration. Our diverse fleet of barges, cranes, and excavators allows us to engage in complex projects including the following three construction types:
  • Environmental
  • Maintenance
  • New Construction
PPM is experienced in remediation for contaminated sites  including necessary EPA-mandated guidelines and often teams with environmental engineering firms to provide value-engineering and constructability reviews. Our crews are certified to handle subtitle D and C material and trained in the use of bmps including the deployment of debris booms and turbidity curtains. PPM maintains partnerships with local water-treatment professionals to ensure water is properly processed. Equipment is outfitted with GPS/RTK hardware and software designed to perform precise, stepped dredge cuts from 6 to 12-in and engineered caps.
In addition to routine maintenance dredging, our team is capable of performing specialized, in-marina, precision dredging utilizing shallow draft dredging equipment outfitted with RTK. The small footprint of our equipment allows us to reach difficult to access areas with minimal disruption to on-going maritime operations. PPM maintains portable, modular barges that can be transported for inland work as well. Our dredge excavators and cranes are equipped with RTK-GPS which allows for sub-inch precision dredging and real time control to the Operator to maintain the required dredge cuts. PPM owns a variety of dredging buckets including sealed environmental Young buckets, Jewel and Young rehandle buckets.
PPM owns and operates a permitted transload facility located on the lower Duwamish River, a major Washington waterway, able to transfer TSCA and CERCLA classified material into trucks for disposal. PPM is experienced transloading contaminated materials into containers, rail cars, and direct loading truck-and-pups. PPM owns and operates bottom-dump barges to deposit approved materials at state-approved open-water disposal sites. The bottom dump barges meet Department of Natural Resources requirements for the Open Water Disposal Site Use Authorization Permit and is capable of being loaded in shallow draft areas.
Our team is capable of performing hydro-graphic surveys to ensure consistent, accurate information throughout the dredging and capping process. Our hydrographic survey boat is equipped with a Reson 7125 multibeam capable of 0.5 degree beam widths and the Applanix POS MV IMU. Data from the boat can collected and processed in-house using HYPACK software. The information collected from the survey boat can be uploaded to our dredging software to identify areas needing potential corrections.


PPM's equipment is frequently used for projects requiring environmental or engineered capping. The RTK-GPS system in-conjunction with the hyrdographic survey boat can be used to place cap material to required elevations and slopes.

What Sets us Apart

PPM employees a workforce certified for hazardous material handling and owns several high-capacity excavators including a 1200 Hitachi Excavator, a narrow footprint pedestal-mounted excavator capable of limited access marina work. Most contractors perform dredging with cable suspended clamshell buckets from large cranes which is imprecise, especially for environmental cleanups. PPM also employees modular, portable barges capable of being configured to 20-ft x 50-ft to 60-ft x 140-ft, 800-CY bottom-dump barges, environmental-sealed buckets, and a multi-beam survey boat capable of developing in-depth bathymetric surveys for project design, quality control, and project close out documentation. Another major distinction in PPM's service offering is our fully permitted transload facility. PPM has the ability and expertise to deliver turn-key dredging services from pre-construction to final disposal.
Key Equipment
  • Modular Barges, Hydraulic Excavators, Variety of Dig Buckets, GPS-RTK  Software, Multi-Beam Survey Boat

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