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TABLE 1.1 (Continued) Impacts Mitigation Measures HYDROLOGY AND WATER QUALITY Increased runoff would result due to The retention pond proposed for the increases in impervious surface area facility should be used to collect from the proposed development. excess storm water resulting from Unless diverted, this additional the project area, except the runoff could aggravate the potential resource recovery area which should ' for downstream flooding by Weber have its own liquid disposal system. Slough. Diversion ditches and graded slopes should be added to areas outside the project area to direct rainwater runoff to Weber Slough. The design of final drainage plans and mitigation measures should be coordinated with the San Joaquin County Department of Public Works. The western and southern portions of The applicant has proposed that the the proposed facility are located waste oil recovery area be linad within the 100-year floodplain of with concrete and surrounded by a Weber Slough. The waste oil recov- two foot high concrete berm whi h ery area, located on the east side would serve as secondary containmeit of the proposed facility outside the of 150 percent of the capacity of 100-year flood zone, would be the the largest oil storage tank plus most important part of the facility the water from 24 hours of a 100- to protect from flooding. year storm. The building pads and/or foundations should be designed so that all floors are one foot above levels of the 100-year flood. Foundations should be built to withstand damage from floodwater and saturated soils. In addition, the top of the berm for the retention pond should be three feet above the level of the 100-year flood. The San Joaquin County Department of Public Works should analyze the design of the berm for the ability to resist damage from the hydrody- namic and hydrostatic forces associ- ated with a 100-year flood. 1-6 I04-8.R3 4/7/89