25G - ENGINEERING SRVS GRADE SEPARATION

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AECIM located to the east ofthe rail line alongthe north side of Environmental Study Minimal Impacts (NES/MI) report Santa Ana Boulevard. ICF Jones & Stokes will consult analyzing potential impacts to biological resources. An with the Caltrans District 12 noise specialist assigned to NES/MI has been identified due to the limited amount of this project to ensure that all requirements are habitat located within the identified project area. The addressed. report will be prepared in accordance with Caltrans SER guidance and will conform to the Caltrans NES/MI Afield noise study will be performed to quantify and annotated outline that is available at the time that the assess existing noise conditions at the potential noise- NES/MI is initiated. The following tasks will be sensitive areas. It is estimated that short-term (10 to 15 performed during the preparation of the reports: minutes duration) sound-level data will be collected at up to four (4) representative noise-sensitive locations Review of Project Information and Applicable throughout the area. In addition continuous 24-hour Literature noise monitoring will be conducted at up to one location A literature review will be conducted to identify special- if asecure measurement location can be identified. status species known or reported from the project area. The literature review will include: ICF Jones & Stokes will conduct traffic noise modeling Special status species lists from the California related to the proposed project using the FHWA Traffic Department of Fish and Game (CDFG) and U.S. Noise Model (TNM) Version 2.5 and traffic data to be Fish and Wildlife Service (USFWS); provided by the project traffic engineer. TNM will be Database searches of current versions of the used to model worst-noise-hour noise conditions at California Natural Diversity Database (CNDDB) representative modeled receiver locations under and the Online Inventory of the California existing conditions and design-year conditions with and Native Plant Society (GNPs); without the proposed project. The most recent applicable Federal Register Traffic noise impacts ofthe proposed project under listing package and critical habitat 23CFR772 will be assessed by determining if determination for each federally listed implementation ofthe project is projected to result in Endangered orThreatened species potentially traffic noise levels under design-year conditions that occurring within the project site; approach or exceed the FHWA noise abatement criteria The most recent CDFG Annual Report on the or if implementation of the project is predicted to result status of California's listed Threatened and in a substantial increase innoise atnoise-sensitive Endangered plants and animals; and uses. If traffic noise impacts are projected to occur, Other available biological studies conducted in information on the preliminary feasibility and the vicinity of the project site. reasonableness of noise abatement as defined in the Protocol will be evaluated and presented for use by Field Evaluation for Biological Resource Constraints decision makers in considering noise abatement. ICF After reviewing relevant information, the project area Jones & Stokes will also evaluate potential construction will be evaluated, with a thorough walkover covering all noise impacts using methods recommended by the U.S. portions relevant to potential biological resource Department of Transportation. constraints. Detailed field notes will be compiled including conditions, visible disturbance factors, ICF Jones & Stokes will prepare a noise study report species, habitats, and more general biological resource addressing the requirements of 23CFR772 in issues observed or detected. The site will be evaluated accordance with guidance in the Protocol and following regardingthe presence, absence, or likelihood of the noise analysis report format outlined in the Caltrans occurrence for all special status species, habitats, or Technical Noise Supplement (TeNS). If warranted the more general biological resource issues potentially noise study report will include a preliminary noise posing a constraint to the project through applicable abatement design to schematically identify the location, laws and regulations. Adjacent areas will also be briefly height, and extent of noise walls needed to abate noise examined to provide context. It is assumed that access impacts. It is assumed that any noise abatement design shall be provided by the City or AECOM for the field and or Noise Abatement Data Report (NADR) would be surveys. If focused habitat evaluations for any species prepared and provided by AECOM. In accordance with other than those included in this scope of work or Protocol guidance, the description of noise walls will be focused surveys are required for any species then this sufficient for environmental review of the proposed will be communicated to the City and AECOM project, but not for final design of the walls. Abatement immediately and a separate scope and cost for this allowances will be provided for each wall evaluated. It work will be provided. The study area is assumed to be is assumed that any final noise wall designs would be the proposed project footprint plus 100 feet (where prepared by AECOM due to the detailed engineering that access is permissible). is required for the design of any such noise walls. This task includes evaluations/determinations for the following potential resource issues: • Habitat Evaluation for Burrowing Owl-A ICF Jones & Stokes will conduct a literature search, qualified biologist will perform an evaluation of perform field surveys, and prepare a Natural r~i f~, fr. ~~,.~~.o~, Ii:~ir~l~~s~l ~~r p:~r~Ue~~ t~~y Re~~~r~: ~;q~uiiv~~e~~: ire ~ I::' i p:~l~ins fair w,~~~ ir~~ Il~~l~v~ir~ r~~ e ~~~r~~~'i~n I~° r~"e~~~ ~ ~ '