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6. Si~gn~ifi!c~anrt EffeCt: Increase in on-site erosion <br /> and siltation in the drainage areas. <br /> <br /> Finding: Restrictions on grading activities, control <br /> measures on surface runoff, and revegetation will <br /> mitigate erosion and siltation impacts. <br /> <br /> Facts: Limiting grading of the project site to <br /> the dry season period, the installation of silt and <br /> oil traps to filter runoff, and the revegetation and <br /> stabilization of all graded or erodible slopes will <br /> reduce impacts associated with erosion and siltation. <br /> <br />7. Significant Effect: ~Potential increase of pollutants <br /> reaching surface streams via runoff and in contamination <br /> of groundwater. <br /> <br /> Finding: Provisions to control urban and industrial <br /> pollutants in storm water runoff from the project site <br /> would mitigate the potential of high levels of <br /> concentration of pollutants entering drainage areas. <br /> <br /> Facts: The installation of on-site grease and sediment <br /> filter traps and revegetation of disturbed areas in <br /> and near the arroyo would control the amount of <br /> pollutants and silt entering the drainage system. <br /> <br /> .Finding: Measures mitigating potential contamina- <br /> tion of groundwater have been adopted as a part of the project <br /> proposal. <br /> <br /> Facts: In order to avoid the contamination by toxic <br /> and hazardous substances on or near the project site, <br /> the existing wells will be sealed per City, water <br /> district, and health department regulations in con- <br /> junction with site development. <br /> <br /> 8. Significant Effect: Northwestern portion of the project <br /> ~ite is located within a flood prone area (100-year <br /> flood level). <br /> <br /> Finding: Topographic changes in this portion of the <br /> project site will be incorporated in the proposal to <br /> reduce the potential for flood damage in the area. <br /> Facts: Federal flood insurance program and local <br /> implementation ordinance require that finished <br /> floors of new structures and roads be constructed <br /> above the 100-year flood level. If, in order to <br /> comply with those requirements, fill material is <br /> necessary on-site, in-channel storage may be required <br /> to replace the flood plain storage capacity. <br /> <br /> -3- <br /> <br /> <br />