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6.0 Impact Considerations Version :27.10.4 <br /> Exposed, Solid Man-made Structures <br /> • Description <br /> . These are solid, man-made structures such as seawalls, groins, revetments, <br /> piers, and port facilities. <br /> . Many structures are constructed of concrete, wood, or metal. <br /> . They are built to protect the shore from erosion by waves, boat wakes, and <br /> currents, and thus are exposed to rapid natural removal processes. <br /> . Often there is no exposed substrate at low tide, but multiple habitats may be <br /> present. <br /> . Attached animals and plants are sparse to moderate. <br /> • Predicted Oil Behavior <br /> . Oil is held offshore by waves reflecting off the steep, hard surfaces in exposed <br /> settings. <br /> . Oil readily adheres to the dry, rough surfaces, but it does not adhere to wet <br /> substrates. <br /> . The most resistant oil would remain as a patchy band at or above the high-tide <br /> line. <br /> • Response Considerations <br /> • Cleanup is usually not required. <br /> . High-pressure water spraying may be conducted to remove risks of <br /> contamination of people or vessels or to improve aesthetic <br /> Shell Supply and Distribution 6-38 Stockton Terminal FRP <br /> ©2019 Witt O' Brien's Revision Date:October, 2019 <br />