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SCOPE OF SERVICES CITY OFSANTAANA SANTA ANA BOULEVARD GRADE SEPARATION MARK THOHAS Existing noise conditions will be quantified based Annotated Noise Study Report Outline. Should on noise measurements conducted at locations impacts be identified, the SNSR will include a along the project alignment. Short-term monitoring preliminary noise abatement design to (10 to 15 minutes)will be conducted during schematically identify the location, height, and daylight hours at selected locations in the project extent of noise barriers needed to abate noise area at up to eight (8) locations. Long-term impacts (if applicable). In accordance with Protocol monitoring (24 hours or more) will be conducted guidance, the description of noise walls will be provided a safe and secure location can be sufficient for environmental review of the Project, identified to leave a long-term sound level meter in but not for final design of the walls. It is assumed the project area at up to two locations. that up to three (3) noise barriers will need to be ICF will prepare a traffic noise model that evaluated. addresses the updated Project design, using the 6.3.5 Noise Abatement Decision Report FHWA Traffic Noise Model (TNM) Version 2.5. ICF will prepare a Noise Abatement Decision This scope assumes that MT will provide 3-D Report (NADR) analyzing the reasonable Computer Aided Design (CAD) topographical allowance for any barriers and respective barrier maps, with elevation contours at no greater than heights that meet the feasibility requirement and two-foot resolution, that extend at least 500 feet design goal discussed in the SNSR. outside of the right of way in all directions. TNM will be used to model worst hour traffic noise The NADR will summarize reasonableness cost conditions at representative modeled receiver allowances for barriers determined to be feasible in locations under existing conditions and design- the SNSR and compare these allowances to the year build and no build conditions with the construction cost estimates for each barrier height proposed Project. This scope also assumes that to identify any reasonable barrier and the barrier the project engineer will provide as-built plans as heights to be included as abatement as part of the well as typical cross sections, alignment files, and project. This scope assumes that all cost estimates design files for all project improvements. for feasible walls will be provided by MT. Traffic noise impacts for the Project will be Comparisons between the reasonable cost assessed under 23CFR772 by determining if allowances and construction cost estimates will be implementation of the Project is projected to result used to identify the preliminary cost in traffic noise levels under design-year conditions reasonableness of barriers. Any barrier found to be that approach or exceed the FHWA noise reasonable will be identified and recommended as abatement criteria or if implementation of the abatement as part of the project. project is predicted to result in a substantial traffic It is assumed that up to three (3) noise barriers will noise increase (12 dB increase relative to the be evaluated in the NADR and that no noise existing) at noise-sensitive uses. If traffic noise barriers will be determined to be reasonable. impacts are projected to occur, information on the Therefore, noise surveys are assumed to be not preliminary feasibility and reasonableness of noise required. If any noise barriers are determined to be abatement, as defined in the Protocol, will be reasonable then noise barrier surveys would be evaluated and presented for use by decision required and a scope and cost for this work will be makers in considering noise abatement. ICF will provided to MT and the City for approval prior to also evaluate potential construction noise impacts conducting this effort. using methods recommended by the U.S. 6.3.6 Updated Caltrans Data Sheets Department of Transportation and/or direction included in Caltrans Standard Specifications (SS). Provide an updated Caltrans Right of Way Data ICF will prepare a Supplemental (SNSR) Sheet (RWDS) for the project reflecting the change addressing the requirements of 23CFR772 in in right of way impacts with the project design. accordance with guidance in the Protocol and Monument will coordinate with the design team to following the NSR format indicated in the Caltrans identify right-of-way acquisitions resulting from the