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3.0 ENVIRONMENTAL CHECKLIST <br />City of San Leandro 1388 Bancroft Avenue Project <br />November 2018 Initial Study/Mitigated Negative Declaration <br />3.0-51 <br />Due to the very low probability of a dam failure that would result in the inundation of San Leandro, this impact would be less than significant. <br />j) Less Than Significant Impact. Tsunamis and seiches are ocean waves or similar waves <br />usually created by undersea fault movement or by a coastal or submerged landslide. <br />Tsunamis may be generated at great distance from shore or nearby. When the waveform from tsunamis or seiches reaches the coastline, it quickly raises the water level, with water velocities as high as 15 to 20 knots. The water mass and vessels, vehicles, or other objects <br />in its path create tremendous forces as they impact coastal structures. <br />A tsunami or seiche originating in the Pacific Ocean would lose much of its energy passing through San Francisco Bay. Areas most likely to be inundated are marshlands, tidal flats, <br />and former bay margin lands that are now artificially filled, but are still at or below level, <br />and are generally within 1.5 miles of the shoreline. The project site is approximately 2 miles <br />inland and is approximately 70 feet above mean sea level (Cornerstone 2016). Therefore, the potential for inundation due to tsunami or seiche is considered low. In addition, <br />according to mapping provided by the ABAG Resilience Program, the project site is not in <br />an area subject to mudlow (ABAG 2018). Impacts would be less than significant. <br /> <br />