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The EMFAC output will be based on vehicle idling using roadway LOS, intersection volumes, and delays as included in the subject project's traffic study. There are currently no formally adopted thresholds for GHG emissions. Determination of significant impacts to GHGs will be performed using the tiered decision tree approach recommended in the SCAQMD Interim CEQA GHG Significance Threshold Draft Guidance document, or alternatively, the most up-to-date methodology available at the time the report is written. URS will prepare a technical memorandum to include the results of the re -quantification of criteria pollutant emissions compared to the 1990 Final EIS/EIR, as well and GHG emissions analysis results. The air quality model runs and calculations will be attached to the technical memorandum as an appendix. Cultural Resources (Section 106) Studies — An HPSR and HRER, including Area of Potential Effects (APE) Map, will be prepared pursuant to guidelines set forth under Caltrans' SER, Volume 2 (Cultural Resources). Consultation with the Native American community, including the Native American Heritage Commission (NAHC) and pertinent tribes recommended by the NAHC, also will be performed as part of the cultural resources documentation. Based on the findings of the 1990 Final EIS/EIR, there are no previously documented archaeological sites within the project area. Furthermore, no sites listed, or eligible for listing, on the National Register, State Register, or Santa Ana Register have been identified within the limits of Phases 3 and 4. As of January 1, 2004, cultural resource studies must be prepared and processed in accordance with the Programmatic Agreement (PA) among FHWA, the Advisory Council on Historic Preservation, the California State Historic Preservation Officer, and Caltrans regarding compliance with Section 106 of the National Historic Preservation Act, as it pertains to the administration of the Federal Aid Highway Program in California. A qualified architectural historian will conduct a field survey of each proposed project area to record buildings, structures, and historic features through photography and written descriptions. This scope of work assumes architectural history survey will require the recordation and evaluation of 50 previously recorded cultural resources (17 properties in Phase 3, and 33 properties in Phase 4) through DPR 523L series forms. This scope of work also assumes no previously unrecorded cultural resources exist within the APE. If other properties are identified that would require recordation and evaluation, a separate scope and cost will be prepared for this effort. Noise Study Report — The proposed project is a "Type I" project as defined by 23 CFR 772 because it will add through lanes of travel. Therefore, noise impacts, and the potential need for noise abatement (e.g., soundwalls) would be assessed in accordance with guidelines set forth in Caltrans' Traffic Noise Analysis Protocol (2006) and Technical Noise Supplement (2009). URS will conduct a field noise study to quantify and assess existing noise conditions at the potential noise - sensitive areas. It is estimated that short-term sound level data will be collected (measured) at up to 8 selected locations throughout the day. In addition, continuous 24-hour noise monitoring will be conducted at up to four locations in the project area if secure measurement locations can be identified. 10