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(n m d :E Table 2-1 (continued) Summary of Impacts and Mitigation Measures (Applicable to Program and Project-Specific Impacts) Impact Significance Mitigation Measure Significance before Mitigation after Mitigation 4.7 Drainage 4.7-1. Drainage—Increased Erosion or Sedimentation. LTS No mitigation required. LTS Development of the proposed project could alter the existing drainage pattern of the site or area in a manner that could result in substantial erosion and sedimentation during project construction and nnoraTinn,(,tpmnl,anrc with R�HnrIP policies,AAI-IAfP....f llCn measures,and Phase I and II NPDES permit requirements, including the preparation and implementation of a SWPPP that outlines BMPs to be followed to minimize erosion and sedimentation,would avoid substantial erosion and sedimentation during project construction and operation. No adverse effects on the capacity and performance of the storm-drain system would occur.A less-than-significant impact would occur. 4.7.2.Drainage—Result In Flooding or Exceed the Capacity of S 4.7.2. Drainage—Result in Flooding or Exceed the Capacity of LTS p the Storm-drain System.The proposed project would increase the the Storm-drain System.The College Park developers shall rate and amount of surface runoff and both increase the demand for expand WQ61 as required to accommodate runoff from the College capacity in the existing downstream MHMP storm-drain system and Park project,or shall provide the required on-site retention in-lieu of n require the development of new storm-drain facilities to serve the the required expansion of WQB1, before development of those s project.However,this would not result in flooding or exceedance of portions of Neighborhoods B and D to be served by the DeAnza the capacity of the MHMP storm-drain system because: the Boulevard and Mountain House Parkway storm-drain systems. existing downstream MHMP storm-drain system has already been R sized to accommodate runoff from the proposed project;and the proposed project would provide adequate capacity in the new ostorm-drain facilities required to serve it.A less-than-significant impact would occur.The project would require expansion of W081 and if not completed before project development,a significant impact would occur. N 4.7-3.Drainage—Require Dewatering that Could Lead to LTS No mitigation required. LTS Cn Flooding.Because groundwater levels at the College Park project w site are a minimum of 40 feet bgs, it is not anticipated that L dewatering would be required during project construction,and no potential would exist for dewatering-related flooding or exceedance = of the capacity of the storm-drain system.A less-than-significant C) impact would occur. M