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6.0 Impact Considerations Version :27.10.4 <br /> Sheltered Rocky Shores and Scarps <br /> • Description <br /> . Sheltered rocky shores are characterized by a rocky substrate that can vary <br /> widely in permeability. Of particular concern are rocky shores that have a <br /> semipermeable veneer of angular rubble overlying the bedrock. <br /> • Sheltered clay scarps are characterized by a steep, usually vertical scarp in <br /> hard-packed and stiff clay. Vegetation usually occurs landward of the scarp. <br /> • Predicted Oil Behavior <br /> . Oil will adhere readily to dry, rough, rocky surfaces, particularly at the high-tide <br /> line, forming a distinct oil band. <br /> . The lower intertidal zone of rocky shores is usually algae-covered and stays wet, <br /> preventing oil from adhering. <br /> • Oil will not adhere to the wet clay sediment surface, but could penetrate dry <br /> sediment. <br /> • Stranded oil will persist because of the low-energy setting. <br /> . Response Considerations <br /> • Low-pressure flushing of rocky shores at ambient temperatures is most <br /> effective when the oil is fresh and still liquid. <br /> • Extreme care must be taken during flushing operations in the upper intertidal <br /> zone to prevent oily effluents from impacting biologically rich lower tidal levels. <br /> • Do not cut oiled, attached algae; use sorbents to recover oil as it is remobilized <br /> by tidal action. <br /> . Where the high-water area of scarps is accessible, it might be feasible to <br /> manually remove heavy oil accumulations and oiled debris. <br /> . The muddy substrate of scarps cannot support heavy equipment, and even foot <br /> traffic could disrupt the sediments and mix oil deeper. <br /> Shell Supply and Distribution 6-45 Stockton Terminal FRP <br /> ©2019 Witt O' Brien's Revision Date:October, 2019 <br />