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Finding: <br /> Based upon the analysis in the EIR,detention pond storage design,collection and routing of <br /> runoff from the working face of the landfill to the leachate collection system,and timing of <br /> pumped discharge from detention ponds will make impacts of stormwater runoff less than <br /> significant. <br /> The following mitigation measures will mitigate these impacts to below a level of significance. <br /> Mitigation Measures (Impact K 3): <br /> (a) The surface water conveyance system, including the detention pond would be <br /> designed to handle the I00 year storm. <br /> (b) Stormwater runofffrom the workingface would be collected at the edges of the <br /> landfill and routed to the perimeter leachate collection trenches. <br /> (c) The timing of the pumped discharge from the detention ponds must not occur with the <br /> peak flow rate of Little Johns Creek as this would impact downstream locations by <br /> increasing the flood hazard. Telemetry, which monitors the flow in the Creek to <br /> determine the peak, should then be used to coordinate the start up of the pumps. <br /> Facts in Support of the Finding: <br /> The potential for stormwater runoff is discussed in Section IILK of the EIR. The measures above <br /> are designed to mitigate effects of stormwater runoff. <br /> c.Potential Contamination of Surface Water from Erosion or Spills <br /> Potential Sign ificantImp act(K 4): <br /> -I <br /> Uncontrolled erosion from soil stockpiles and landfill surfaces,or inadvertent spills of refuse or <br /> other substances on-site could contaminate surface water. <br /> Finding: <br /> Based upon the analysis in the EIR,bridge design and maintenance,and Air Quality Mitigation <br /> Measure G.1 to mitigate fugitive dust will make potential contamination of surface water less <br /> than significant. <br /> The following mitigation measures will mitigate these impacts to below a level of significance. <br /> Mitigation Measures (Impact K4): <br /> (a) The final bridge design shall include structural controls to prevent spilled or tracked <br /> sediment from entering the stream channel, and shall be regularly cleared of <br /> accumulated sediment and refuse. Accumulated material shall be properly disposed of in <br /> the landfall. <br /> 44 <br />