25G - AGMT - ENVIRONMENTAL SERVICES - 200 E FIRST AMERICAN WAY

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Environmental Consulting Services (200 East First American Way) City of Santa Ana ¦ Contact OCTA and formally request preparation of OCTAM 3.3 approved computer traffic model runs for the model baseline conditions, and Year 2035 buildout conditions for the AM and PM peak periods and daily traffic conditions. ¦ Forecast future Year 203.5 traffic volumes using the following methodology: (a) Peak period traffic volumes will be converted to peak hour (i.e., one-hour) traffic volumes using a conversion factor of 0.38 for the AM peak hour and 0.28 for the PM peak hour; (b) Calculate the difference between the model baseline and the Year 2035 buildout peak period traffic volumes and convert to AM and PM peak hour (i.e., one-hour) link traffic volumes; (c) Link traffic volumes (i.e., two-way directional traffic volumes on each roadway segment) will be post- processed using the "b-turns" program and the relationship of the base year validation model run output to the base year "ground" traffic counts to develop 2035 AM and PM peak hour traffic volumes. TIA Task 5: Project Evaluation and Mitigation Analysis ¦ Prepare AM peak hour and PM peak hour Level of Service (LOS) calculations at up to fifteen (15) study intersections to determine the potential impacts of the proposed project. The following traffic scenarios will be prepared. (a) Existing Traffic Conditions; (b) Existing Plus Project Traffic Conditions; (c) Scenario (b) with Mitigation, if necessary; (d) Near-Term Background Traffic Conditions (Existing plus Ambient Growth plus Related Projects); (e) Near-Term Background Plus Project Traffic Conditions; (f) Scenario (e) with Mitigation, if necessary; (g) Long-Term (2035) Traffic Conditions; (h) Long-Term (2035) Traffic Conditions Plus Project; and (i) Scenario (h) with Mitigation, if necessary. ¦ The LOS calculations will be based on City-approved capacity analysis methodologies (i.e., Intersection Capacity Utilization method, Highway Capacity Manual method, etc.). The future background traffic volumes will be forecast by applying a growth factor (typically estimated at 1.0 to 2.0% per year) to the existing traffic volumes and adding traffic from cumulative developments (related projects) in the study area, while long- term projections will be forecast based on OCTAM 3.3 traffic forecasts. Prior to initiation of the analysis, we will confirm the traffic analysis conditions with City staff. ¦ Assess the impact of the project based on the results of the peak hour intersection analyses, the City's LOS standards and application of the City's significance criteria. Based on this assessment, determine which intersections (if any) will require improvements to mitigate potential traffic impacts associated with the proposed project to less than significant levels. ¦ Provide recommended mitigation measures which may include intersection and/or signalization improvements, striping modifications, the addition of auxiliary turn lanes, traffic control/limitations at site access points, etc. Please note that this proposal assumes the recommended mitigation measures can be adequately described within the text of the report. Should the City request preparation of plans to further demonstrate the feasibility of the mitigation measures, an amendment to our contract will be necessary. e Calculate the net traffic increment (fair-share percentage) due to the project at the impacted intersections. Based on the required mitigation measures, estimate the project's fair-share towards the cost of the proposed mitigation improvements. Use of disclosure ofdota contained on thissheetis subject to the teshictlbn on the title page of this proposal Page 12 25G-24