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01/24/2011 Exhibit B Impact 11 -3. DPP - Related Temporary Construction Ground -Borne Vibration Impacts. Demolition and construction activities in the DPP area could generate substantial temporary ground -borne vibration (e.g., from pile driving) exceeding standard vibration thresholds, which could interfere with normal activities or cause a nuisance for or damage to adjacent properties. a) Potential Impact. The impact identified above is described and discussed on pages 11 -23 to 11 -24 of the DEIR. b) Mitigation Measures. FEIR Mitigation Measure 11 -3 (p. 11 -25 of the DEIR) is hereby adopted and will be implemented as provided in the Mitigation Monitoring and Reporting Program. c) Findings. Based on the FEIR and the entire record before the City, the City Council finds that Mitigation Measure 11 -3 (page 11 -25 of the DEIR), will reduce this impact to a less than significant level because it will impose conditions of approval on all future projects involving demolition and construction activities. Those conditions will: restrict the hours during which vibration - generating activity is permitted; require written notice of projected construction schedules be provided to affected occupants; require steps to minimize the number of percussions during pile- driving; require monitoring of pile - driving vibrations to ensure they do not exceed appropriate thresholds; and require pre - construction site surveys to document the condition of any historic structure located within 200 feet of pile driving activities. Impact 11 -4. Temporary Construction Noise Impacts. Demolition and construction activities within the DPP area could temporarily increase noise levels at nearby residential and commercial receptors. Noise levels at 50 feet from the demolition or construction equipment source could reach approximately 105 dBA, resulting in intermittent interference with typical residential and business activities, and exceeding the City's land use /noise compatibility guidelines. a) Potential Impact. The impact identified above is described and discussed on pages 11 -25 to 11 -28 of the DEIR. b) Mitigation Measures. FEIR Mitigation Measure 11 -4 (p. 11 -28 of the DEIR) is hereby adopted and will be implemented as provided in the Mitigation Monitoring and Reporting Program. c) Findings. Based on the FEIR and the entire record before the City, the City Council finds that Mitigation Measure 11 -4 (page 11 -28 of the DEIR), will reduce temporary construction noise impacts to a less than significant level because it will require conventional construction - period noise abatement measures as conditions of approval for all future projects involving demolition and construction activities. 12 Air Quality Impact 12 -1. Toxic Air Contaminant and PM2. Exposure Impacts. Future U: \Resolutions\2011\Reso 15086 Exhibit B.doc 42 012011 Reso. # 15086 Muff #601