25B - SANTA ANA BLVD GRADE SEPARATION_Exhibit A-1_Color

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AECO M prepared will identify and document anticipated impact to paleontological resources existing with the project's limits of disturbance (both vertical and horizontal), if potential impacts exist. ICF Jones & Stokes shall prepare a PIR /PER that includes the following: • Summary of the proposed project • Delineation of the project limits • Delineation of the project excavation locations and depths • Document efforts to avoid or minimize effects on paleontological resources • Identify significance and /or sensitivity of paleontological resources and /or rock units following the guidance provided at: http: / /www.dot.ca.gov /ser /volt /sec3 /physical /Ch0 8Paleo /chap08paleo.htm #pir • Identification of sources consulted and results of that consultation • Identification of any consultation related constraints • Identification of a course of action, including identification of specific geologic formations and paleontological resources • Identification of the persons preparing the PIR /PER and their qualifications • Identify whether a Paleontological Mitigation Plan (PMP) is recommended It is assumed that a PMP will not be recommended or required for the proposed project and one is not included in this scope and cost. It is further assumed that the findings of the PIR /PER will be negative and no additional paleontological tasks or effort will be req u i red. Based upon the last three road /rail grade separation projects that ICF Jones & Stokes has performed in southern California an air quality report may not be required for the project. It has been determined on these other three projects that as long as the project does not add additional capacity or include the installation of new stop signs or traffic signals that an Air Quality Report is not required. However, an Air Quality Report has been included in this scope and cost in case it is ultimately determined to be required by the District. This will be discussed early in the process with Caltrans and further document in the PES that is prepared. ICF Jones & Stokes will prepare an air quality technical report that analyzes air pollutant emissions associated with changes in vehicle speed and traffic distribution patterns resulting from the proposed project. All impact analyses will be performed consistent with the technical requirements and methodologies outlined in the Caltrans' Standard Environmental Reference (air quality chapter). The air quality technical report will provide the following discussions and analyses: Regulatory Setting and Existing Conditions. Summarize the existing federal, state, and local air quality regulatory environment as it affects the proposed project, and describe the location of sensitive receptors in the project vicinity. Using data provided by the California Air Resources Board (CARB) and the SCAQMD, characterize existing air quality conditions in the project area and explain how those conditions are affected by local climate and topography. Evaluation of Construction Emissions. Based on current District 12 procedure, provide a qualitative discussion related to construction emissions. Evaluation of Operations- Period Mass Emissions. Evaluate whether the project meets transportation conformity requirements by determining whether it is included, as currently defined, in the most recent Regional Transportation Plan (RTP) and Regional Transportation Improvement Program (RTIP) prepared by the Southern California Association of Governments (SCAG). It is assumed that the projects will be included in the RTIP and that a regional analysis will not be req u i red. Localized Carbon Monoxide Hot SpotAnalysis. Analyze the degree to which project- related traffic volumes have a potential to effect local carbon monoxide (CO) concentrations using the California Department of Transportation CO Hotspot Protocol. It is anticipated that the CO screening procedure will be appropriate. However, it is assumed, based on experience within the District that CALINE -4 dispersion modeling will also be performed. It is assumed that up to two intersections will be modeled. Localized PM2.5 1PM10 Hot Spot Analysis. Analyze the degree to which project- related traffic volumes have a potential to affect local PM2.5 and PM10 concentrations, based on the United States Environmental Protection Agency (EPA) guidance document entitled Transportation Conformity Guidance for Qualitative Hot -spot Analyses in PM2.5 and PM10 Nonattainment and Maintenance Areas. This scope and cost assumes that a screening level analysis is appropriate, and that no modeling will be required by Caltrans or FHWAto address PM2.5 and PM10. Mobile Source Air Toxics. Evaluate proposed project - related mobile source air toxics (MSATs) emissions in accordance with FHWA interim guidance on how MSATs should be addressed in NEPA documents. It is not assumed that extensive qualitative analyses would be required to address MSATs. If an extensive quantitative analysis is required for the project, then a scope and cost estimate would be provided for this additional effort, however, such an analysis is not anticipated. .g ._r Proposal for Project Study Report Equivalent and Conceptual Engineering Plans for Santa Ana Boulevard Grade Separation Project