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TABLE 1-1 SUMMARY OF IMPACTS AND MITIGATION MEASURES <br />Significant Impact <br />Significance <br />Before <br />Mitigation Mitigation Measures <br />Significance <br />With <br />Mitigation <br /> Piles shall be removed during low tide periods to minimize the <br />amount of sediments re-suspended in the water column. <br /> When removing piles, the pile shall be hit or vibrated first to <br />break the bond with the sediment, which would minimize the <br />likelihood of the pile breaking and reduce the amount of <br />sediment released into the water column. <br /> A turbidity curtain shall be installed prior to removing or installing <br />piles or any other waterside activities to minimize turbidity <br />impacts in the water column. <br /> Piles shall be pulled from the subsurface and quickly placed onto <br />a receiving barge or land to minimize potential releases of <br />creosote, petroleum sheens, and turbidity in the water column. <br />Piles shall not be rinsed or washed. The storage area for the piles <br />shall include straw bales, filter fabric, or other containment <br />devices to contain runoff. <br /> During removal of the existing dock system, floating rafts and/or <br />trash and debris containment booms shall be placed under the <br />docks and around the areas of demolition to contain debris that <br />may be released during these activities. <br /> Any waterside construction activities shall be restricted to the <br />period from June 15 through October when special-status fish <br />species would most likely not be expected within the affected <br />areas. <br />HYDRO-1B. Construction activities could temporarily <br />degrade water quality with increases in suspended <br />sediment and turbidity and could result in the release of <br />chemicals and hydrocarbon fuels into the water column. <br />S HYDRO-1B. Minimize Potential for Fuel Releases During Waterside <br />Demolition and Other Construction Activities. The following <br />mitigation measures are designed to avoid potential releases of fuel <br />constituents into the water column during demolition/construction <br />activities: <br /> A spill contingency plan shall be prepared that addresses the <br />potential for an accidental release of fuel into navigable <br />waterways. The plan shall include floating booms and absorbent <br />materials to recover hazardous spills and include provisions for <br />containment, removal, and disposal of spilled materials. <br /> No fueling, cleaning, or maintenance of vehicles or equipment <br />LTS