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Section 5 <br />Alternative 3: Reduced Intensity Alternative <br />Under Alternative 3, one less injection well would be developed. An additional 9 <br />MGD of groundwater recharge capacity would be provided to the Orange County <br />Groundwater Basin, Compared to the Proposed Project, there would be a <br />decreased amount of groundwater recharge capacity, <br />Under Alternative 3, MBI-2 would not be implemented. Without the operation of <br />M131-2, the flow path from MBI-2 would narrow and the travel' time to wells, IRWD- <br />17 would increase. Similar to the Proposed Project, Alternative 3 would provide <br />the required primary and secondary buffer area. Additionally, with one less <br />injection well there would be reduced groundwater mounding. Similar to the <br />condition of the Proposed Project, no existing contaminated plumes have been <br />identified in the project area. Therefore, there would be no concern that <br />groundwater mounding from the injection wells would cause existing <br />contaminated plumes to migrate. <br />Alternative 4: Pipeline Design Alternative <br />Under Alternative 4, an alternative pipeline alignment would be constructed. <br />Potential increases in ground water supplies would be the same as the Proposed <br />Project. Because Alternative 4 would have the same amount of wells and in the <br />same locations as the Proposed Project, there would be no conflicts in meeting <br />the 3-month primary buffer area and the 4 -month secondary buffer requirement. <br />No existing contaminated plumes have been identified in the project area. Similar <br />to the Proposed Project there would be no concern that the groundwater <br />mounding from the injection wells would Cause existing contaminated plumes to <br />migrate. <br />Mitigation Measures <br />No mitigation measures required <br />Level of Impact after Mitigation <br />Alternative 1: No adverse impact <br />Alternative 2. Beneficial impact <br />Alternative 3: Beneficial impact <br />Alternative 4: Beneficial impact <br />IMPACT HWQ 1 Would the project substantially alter the existing drainage <br />pattern of the site or area, including through the alteration of the course of <br />a stream or river, in a manner which, would result in flooding on or offsite? <br />Mid Basin Centennial Park �j 6anj bProject Final EIR 5-124 <br />