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Section 5 <br />implementation of Mitigation Measure GEO-1 potential erosion impacts would be <br />reduced to a less than significant level. <br />Mitigation Measures <br />GEO-1: Prior to the start of construction OCWD will obtain coverage under the <br />General Construction Permit by the State Water Resources Control Board and in <br />compliance with the permit will file a Notice of Intent with the State Water <br />Resources Control Board and prepare and implement a Storm Water Pollution <br />Prevention Plan. <br />Level of Impact after Mitigation <br />Alternative 1: No adverse impact <br />Alternative 2: Less than significant with Mitigation Measure GEO-1 <br />Alternative 3: Less than significant with Mitigation Measure GEO-1. <br />Alternative 4: Less than significant with Mitigation Measure GEO-1. <br />IMPACT HWQ-5: Would the project create or contribute runoff water which <br />would exceed the capacity of existing or planned storm water drainage <br />systems or provide substantial additional sources of polluted runoff. <br />Alternative 1: No Federal Action/No Project <br />Under Alternative 1, the project would not be implemented. There Would not be <br />any introduction of new impervious Surfaces or replacement of existing <br />impervious Surfaces at the project site. Within the project area there would be no <br />change to existing rates of storm water runoff. <br />Alternative 2. Proposed Project <br />Construction Surface Water Management <br />Onsite construction activities associated with Proposed Project could generate <br />degraded surface water runoff from the project site into local drainage facilities. <br />To prevent degraded storm water runoff pollutants from entering into existing <br />drainage systems, the construction operations for the Mid Basin Centennial Park <br />Injection Well Project would be required to prepare and implement a Storm Water <br />Poilution Prevention Plan (SWPPP), The SWPPP would contain Best <br />Management Practices to control the surface water runoff and to minimize the <br />potential for it to be conveyed into onsite or offsite drainage systems. With the <br />implementation of Mitigation Measure GEO-1 potential degraded surface water <br />runoff impacts would be reduced to a less than significant level. <br />0� Mid Basin Centennial Park J 16&ffi Project Final FIR 5-128 <br />