20A - AA FIRST ST BRIDGE REPLACEMENT PROJECT

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LSA ASSOCIATES, INC. INITIAL STUDY/MITIGATED NEGATIVE DECLARATION JULY 2010 FIRST STREET BRIDGE REPLACEMENT PROJECT CITY OF SANTA ANA 2.5 SOUND BARRIER WALLS Three sound barrier walls are proposed as part of the proposed project. The location of the proposed sound barrier walls is shown on Figure 17. The sound barrier walls are numbered. Sound barrier wall number 1 (north west quadrant) will be located in place of the existing 5 ft wall which separates the First Street from the apartment complex. The sound barrier wall will be approximately 9-12 ft height and extend 238 ft from the existing entrance on the First Street westerly to the N. Susan Street. Sound barrier wall number 4 along the edge of shoulder on the north east side of the First Street will be 6-14 ft high and will extend 477 ft easterly from Santa Ana River to the existing entrance to the park at First Street. Both sound barriers will be located approximately 4.5 ft from the nearest travel lane. The reason for the sound barrier walls is to protect sensitive land uses from roadway noise. For a full discussion of roadway noise and sound barrier walls, refer to Section XI in Section 4 Environmental Analysis. For sound barrier wall number 2, the City is evaluating an alternative design that follows First Street and then turn north at the end of the bridge abutment and would then be adjacent to the existing wall at the apartment complex along the west side on the upper bank of the Santa Ana River. This bend would occur instead of the wall extending onto the bridge as shown in Figure 17. This area lies within the OCFCD boundaries for the flood control access road. The area is maintained as a dirt and gravel area associated with the flood channel and access. 2.6 DISCRETIONARY ACTIONS Development of the proposed project would require discretionary approvals by the City, the Lead Agency, and Responsible Agencies. The City's discretionary actions include the following: • Advertisement for bids for construction/approval of plans 2.7 RESPONSIBLE AGENCIES AND OTHER APPROVING AGENCIES Table 2.1 shows the Responsible Agencies as defined by Section 15381 of the State CEQA Guidelines, and agencies that have approvals associated with the project. 2.8 OTHER REQUIRED APPROVALS Ministerial permits/approvals would be issued by the City to allow demolition, debris removal, site preparation, and construction. These approvals may include, but are not limited to, the following approvals: • Demolition and Haul Route Permit/Traffic Control Plan • Approval of a Water Quality Management Plan (WQMP) P:\DMJ0701\MND\2.0 Project Description.doc (07/25/10) 2-22 20A-33