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Impact 2 - Flooding <br /> The western and southern portions of the facility site are located <br /> within the 100-year floodplain of Weber Slough and would be subjected to <br /> flood levels of approximately one foot above ground level . Such flooding <br /> could damage structures and affect the safety of operators and users of <br /> the facility. However, the used lubricant handling, storage, and <br /> processing area (waste oil recovery area) would be located on the east <br /> side of the facility, outside the 100-year floodplain, in two zones; one <br /> between the 100-year and 500-year flood limits and, the other, in the <br /> zone of minimal flooding potential (see Figures 2.3 and 3.4) . The waste <br /> oil recovery area would be the most important part of the facility to <br /> protect from flooding and other hazards. <br /> The applicant has proposed that the waste oil recovery area be <br /> lined with concrete and surrounded by a two foot high concrete berm. The <br /> berm is proposed to provide secondary containment of 150 percent of the <br /> capacity of the largest oil storage tank plus the water from 24 hours of <br /> a 100-year storm. The berm should also adequately protect the waste oil <br /> recovery area from rising water level due to 100-year flood which occurs <br /> outside the bermed area. <br /> Mitigation Measures. The location of the waste oil recovery area <br /> outside the 100-year flood zone and implementation of the above mitiga- <br /> tion measures should minimize potential flooding impacts to the waste oil <br /> recovery area to an insignificant level . The San Joaquin County Depart- <br /> ment of Public Works should also analyze the design of the berm for the <br /> ability to withstand the hydrodynamic and hydrostatic forces that would <br /> be associated with a 100-year flood. <br /> Other building foundations should be designed so that all floors <br /> are one foot above the levels of the 100-year flood. Foundations should <br /> be built to resist damage from floodwater and saturated soils. In addi- <br /> tion, the top of the berm for the retention pond should be three feet <br /> above the level of the 100-year flood. In accordance with regulations of <br /> the Federal Emergency Management Agency (FEMA) , all floodproofing work <br /> should be approved by a certified engineer or architect. These measures <br /> would reduce the flooding impacts to a level of insignificance. <br /> 3-42 <br /> 101-45.R4 4/10/89 <br />