25B - SANTA ANA BLVD GRADE SEPARATION

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• Mapping and design information from the City for improvement projects; • Hazardous material/waste information; • Preliminary materials (geotechnical) information; • Traffic data (existing and forecasted traffic, level of service, capacity adequacy, operational analysis, accidents, etc.); and • Right-of-way and utility plans. Task 1.3 Topo/Base/Field Work/Design Surveys Control Surveys Horizontal and vertical corridor control will be established along the corridor to support the aerial photogrammetry, land net surveys, engineering surveys and future design and construction activities along the corridor. The survey control will be set in accordance with Caltrans survey standards and will be tied into the North American Datum of 1983 (NAD83 NSRS 2007) and the North American Vertical Datum of 1988 (NAVD88 Riverside County) or as specified by the client. Land Net Surveys and Mapping This task entails cadastral research within Caltrans District 12 and the County of Orange for existing centerline and right-of-way files and/or available cadastral records in support of the centerline and right-of-way of I-5, Santa Ana Boulevard, and Lincoln Street. Field surveys will be performed to locate the centerline. In addition, key monuments will be located in order to calculate the centerline of the corridor and adjacent intersecting routes. The right-of-way will be based upon record calculations only and will not be surveyed. A land net base map will be prepared at a scale comparable to the aerial mapping and will include said record centerlines and rights-of-way as well as underlying cadastral information, ownership information as recorded with the Riverside County assessor's office. All these data will be incorporated with the aerial mapping and delivered in a Microstation v8 format. Photogrammetric Mapping The aerial mapping will be prepared in conformance with Caltrans CAD mapping standards and photogrammetric specifications. Horizontal and vertical aerial control panels will be set to meet aerial triangulation requirements. The mapping will be prepared to 1" = 50' scale with 1-foot contours and will be delivered in a Microstation v8 format. Survey crews will field verify the aerial mapping to delineate planimetrics obstructed by tree coverage or shadows and to verify the contours and spot elevations generated from the aerial mapping. A color digital orthophoto with 3" pixel resolution will be prepared from the 50-scale imagery. The digital orthophoto will cover the same mapping limits described above. Task 1.4 Traffic Operations Analysis We will prepare a traffic operations analysis for the Santa Ana Boulevard grade separation project. The traffic operations analysis will examine existing and forecast future year conditions in the vicinity of the OCTA/SCRRA at- grade crossing with Santa Ana Boulevard. The future year conditions examined will be the project opening year and the project design year (20 years after opening, assumed to be 2035). Conditions examined will include the No Project Alternative and up to three build alternatives. 047 of Santa Ana 25B-23