75A - PH BRISTOL ST MEMORY LN PROJECT

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ENVIRONMENTAL IMPACT REPORT ADDENDUM Bristol Street and Memory Lane Intersection Improvements — Project No. 17-6883 The proposed Project involves widening the west side of Bristol Street, north of the intersection of Bristol Street and Memory Lane, in an urbanized area of multi- and single-family residential uses, commercial uses, and vacant land. The widening of the proposed ROW from 100 feet to 111 feet will not substantially change the noise levels which were analyzed in the 1990 FEIS/EIR. Changes to traffic noise impacts typically occur when there is a substantial horizontal alteration to the roadway. The Caltrans Traffic Noise Analysis Protocol guidance per federal regulations (23 CFR 772) defines a substantial horizontal alteration as a project that halves the distance between the traffic noise source and the closest receptor between the existing condition to the future build condition. The existing distance from the ROW to the closest receptor is approximately 30 feet. When adding the additional 11 feet to the ROW, this is less than half of the distance which means that the Project does not cause a substantial horizontal alteration. The Proposed Project modifications would not result in any new long-term mobile and stationary noise impacts. Only nominal changes to grading or construction activities would occur. No increases to road vehicle capacity would occur. No new impacts have been identified and no new mitigation measures are required. Impacts would not be greater than that previously analyzed in the 1990 FEIS/EIR. Certified 1990 FEIS/EIR Mitigation Measures: I-1 Construction activities will take place only during the hours specified in the City of Santa Ana Noise Control Ordinance to reduce noise impacts during more sensitive time periods. I-2 All construction equipment, fixed or mobile, operated within 1,000 feet of a dwelling shall be equipped with properly operating and maintained muffler exhaust systems. I-3 Stationary equipment shall be placed such that emitted noise is directed away from sensitive noise receivers such as residential areas. I-4 Stockpiling and vehicle staging areas shall be located as far as practical from occupied dwellings. I-5 Every effort will be made to create the greatest distance between noise sources and receptors during construction. I-6 The noisiest construction operations will be arranged to occur together in the construction program to avoid continuing periods of greater annoyance. Mitigation Measures: No additional mitigation measures are required. b) Exposure of persons to or generation of excessive groundborne vibration or groundborne noise levels? Refer to Response 3.12(a). During Project construction, noise associated with construction may intermittently dominate the noise environment in the immediate area of construction. No additional adverse noise impacts from construction are anticipated as construction would comply with the City of Santa Ana Municipal Code, which limits construction noise to the least noise sensitive portions of the day. Construction equipment would be properly fitted and maintained according to the manufacturer's specifications. Furthermore, construction noise would be short- term, temporary, and cease upon completion of the proposed Project. Impacts would be similar to those identified in the 1990 FEIS/EIR with implementation of mitigation measures and would not be greater than what was previously analyzed. The proposed widening of Bristol Street and ROW acquisition just north of Memory Lane would involve additional ROW take at adjoining properties in order to accommodate the third southbound through lane (considered in the 1990 FEIS/EIR). These changes would be nominal and would result in similar noise levels as the 1990 FEIS/EIR, which would be below significant levels. The Proposed Project modifications would not result in any new long- term mobile and stationary noise impacts. No changes to grading or construction activities would occur. No increases to road vehicle capacity or lane configurations would occur. No new impacts have been identified and no new mitigation measures are required. Impacts would not be greater than that previously analyzed in the 1990 FEIS/EIR. Draft I November 2017 3-21 Environmental Consequences 75A-50