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6.0 Impact Considerations Version :27.10.4 <br /> Riprap <br /> • Description <br /> • Riprap structures are composed of cobble- to boulder-sized blocks of granite, <br /> limestone, concrete, or other materials. <br /> . Riprap structures are used as revetment and groins for shoreline protection, and <br /> as breakwaters and jetties around inlets and marinas. <br /> . Attached biota are generally sparse on exposed riprap. <br /> . They are common in highly developed waterfront areas. <br /> . Predicted Oil Behavior <br /> • Deep penetration of oil between the blocks is likely. <br /> . Oil adheres readily to the rough surfaces of the blocks. <br /> • Uncleaned oil can cause chronic leaching until the oil hardens. <br /> • Response Considerations <br /> . When the oil is fresh and liquid, high pressure spraying and/or water flooding <br /> may be effective if all liberated oil is recovered. <br /> . Heavy and weathered oils are more difficult to remove, requiring scraping and <br /> high-pressure, hot-water flushing. <br /> Shell Supply and Distribution 6-43 Stockton Terminal FRP <br /> ©2019 Witt O' Brien's Revision Date:October, 2019 <br />