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6.0 Impact Considerations Version :27.10.4 <br /> Industry Standards for Shoreline & Habitat Response Zone Cleanup <br /> Spills in Intertidal Environment <br /> Exposed, Rocky Shores <br /> . Description <br /> . The intertidal zone is steep (>30 slope) and narrow with very little width. <br /> • Sediment accumulations are uncommon because waves remove debris that <br /> has slumped from the eroding cliffs. <br /> . There is strong vertical zonation of intertidal biological communities. <br /> . Species density and diversity vary greatly, but barnacles, snails, mussels, <br /> polychaetes, and macroalgae can be abundant. <br /> • Predicted Oil Behavior <br /> . Oil is held offshore by waves reflecting off the steep, hard surfaces. <br /> . Any oil that is deposited is rapidly removed from exposed faces. <br /> . The most resistant oil would remain as a patchy band at or above the high-tide <br /> line. <br /> Impacts to intertidal communities are expected to be short-term. An exception <br /> would be where heavy concentrations of a light refined product came ashore <br /> very quickly. <br /> . Response Considerations <br /> • Cleanup is usually not required. <br /> . Access can be difficult and dangerous. <br /> Shell Supply and Distribution 6-37 Stockton Terminal FRP <br /> ©2019 Witt 0' Brien's Revision Date:October, 2019 <br />