AgdaPkt 2018-05-07 Joint SA PFA - Laserfiche WebLink

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ATTY/RESO.0035/CC RESO CERTIFYING FINAL EIR – 1548 MAPLE REV: 04-30-18 PR Page 18 of 49 The project applicant shall provide written approval from the Regional Water Board of the successful implementation of the Response Plan and proposed residential land use to the City prior to issuance of a certificate of occupancy. Finding: Implementation of Mitigation Measure HAZ-3 would reduce the project- related impact to health risks associated with exposure to VOCs to a less-than-significant level. Facts in Support of Finding: This mitigation measure appropriately identifies necessary inclusions in the Response Plan to ensure potential health risks associated with exposure to VOCs are below established thresholds, and requires approval from the Regional Water Board for the successful implementation of the Response Plan. HYDROLOGY AND WATER QUALITY Impact HYD-1: If construction of the proposed project or the project variant results in the reuse of existing contaminated soil or contaminated imported fill materials for use as engineered fill or for surcharging, impacts to water quality could occur. Mitigation HYD-1: Implement Mitigation Measure HAZ-1. Finding: Implementation of Mitigation Measure HAZ-1 would reduce the project- related impacts to water quality to a less-than-significant level. Facts in Support of Finding: Mitigation Measure HAZ-1 appropriately identifies the process for preparation of a Response Plan, the requirements for the activities that shall be included, and the requirement that the Response Plan be reviewed and approved by the Regional Water Board. Impact HYD-2: The retaining wall, placement of fill material, reconstruction of Maple Street, or other improvements occurring within the current 100-year flood zone along Redwood Creek could increase the depth and velocity of flood flows along the existing banks, which could result in erosion and siltation during operation of the proposed project and the project variant. Mitigation HYD-2: Proposed improvements within 100-year flood zones and coastal flooding hazard areas, and proposed improvements affecting stormwater drainage systems (e.g., the proposed retaining wall and placement of fill and/or other potential improvements) shall be analyzed using detailed hydraulic evaluations to ensure that the improvements would not impede or redirect flood flows, contribute to exceeding the capacity of existing stormwater drainage systems, or alter the hydrodynamics of stormwater flows such that erosion could occur. The detailed hydraulic evaluations shall be performed and certified by a professional engineer, and shall quantify the following information. • The potential for improvements within 100-year flood zones, coastal flooding hazard areas, and drainage courses to impede or redirect flood flows including storm-related flooding and coastal flooding hazards including tsunamis, sea level rise, and extreme high tides. • The potential for improvements to stormwater drainage systems to exceed the capacity of existing off-site stormwater drainage systems. 7.A. - Page 55