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E. Preliminary Engineering This task includes preparing and obtaining the approval for the Advanced Planning Study (APS) of the overcrossing bridge and the GAD of the preferred alternative (Exhibit B) in accordance with Caltrans plan preparation criteria for GAD. The proposed improvements as shown in Exhibit B were designed and drawn in metric units. The Consultant shall be responsible for modifying the final configuration to accommodate the alternatives of OCTA's SR -55 Widening Project in US Customary English units. GAD includes conceptual grading for the establishment of preliminary right -of -way limits. The Consultant shall complete the Caltrans design checklist (DIB 78) and be responsible for the preparation and approval of any supplemental mandatory and /or advisory fact sheets from Caltrans of all additional non - standard design elements during this preliminary phase. Plan drawings shall be prepared on strip maps in a sufficient scale to show design features, typically 1 ":50' or 1 ":100' (Refer to Caltrans Guidelines for GAD Submittal Guidelines). The GAD development shall include two (2) milestone deliverables —Draft GAD and Final GAD. At each milestone, eight (8) copies of the GAD, checklist, and fact sheet shall be delivered to the Cities of Santa Ana and Irvine, along with requisite number of copies required by Caltrans District 12. The electronic files shall be submitted upon the approval of GAD. F. PS &E Preparation Upon receiving the approval of the GAD and the APS from the City of Santa Ana, City of Irvine, and Caltrans, the Consultant shall prepare the necessary PS &E documents ready for bidding for each design option separately. The design within the Caltrans right -of -way shall follow all applicable Caltrans standards. Design within the City of Santa Ana or Irvine limits shall follow their respective design standards. The following shall be included: Survey and Mapping – Design level survey and base mapping of the project site shall be prepared in US Customary English units by a California licensed Land Surveyor in accordance with Caltrans Surveys Manual and in Microstation V8 format. The horizontal datum shall be NAD 83 and the vertical datum shall be NAVD 88. The Consultant shall be responsible for the following, but not limited to: a. Obtain survey control of Caltrans and the Cities of Santa Ana and Irvine. b. Recover, tie and verify existing survey control to adjacent monument and benchmark controls. C. Provide additional secondary horizontal and vertical control for design surveys. 0