25B - AGMT - ENVIRONMENTAL SERVICES FOR WARNER AVE WIDENING

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HYDROLOGY AND DRAINAGE STUDIES Drainage Analysis and Report IBI Group will assemble and review the relevant available topographic data, as-built roadway and drainage facility plans, and hydrology studies for the corridor to assess the existing conditions and the likely changes to the rum-off flow patterns and quantities due to the proposed roadway widening alternatives. Up to three alternatives will be assessed. Based on this assessment, the required modifications to the existing drainage facilities as a result of the proposed roadway widening modifications will be conceptually defined. Only concept-level hydrology and hydraulic analyses will be used for this work along with a preliminary assessment of the costs associated with the required drainage improvements. The results of this analysis will be summarized in the Drainage Report, which will include a narrative of the assembled data, analysis procedures and findings including a figure depicting existing and proposed drainage facilities. This report will be Included as an attachment to the Preliminary Engineering Report. Water Quality Documentation Upon completion of the Drainage Report, IBI Group will prepare conceptual water quality (WQ) management documentation for the Warner Avenue widening project area. The conceptual WQ documentation will identify potential pollutants of concern, low-flow and nuisance flow drainage patterns, and preliminary water quality peak flow rates for a single roadway widening concept. This documentation will recommend best management practices (BMPs) within the project area to address water quality concerns. The conceptual WQ documentation will consist of a narrative describing procedures, findings, and recommended BMPs as well as an exhibit identifying the placement of the recommended BMPs within the project area. Deliverables: • Hydrology/Drainage Study report • Conceptual WQ Documentation UTILITIES AND EMERGENCY / COMMUNITY SERVICES This task includes assembling utility data and preparing base maps of existing utilities. Existing utilities within the proposed project area include water (Metropolitan Water and City of Santa Ana), sewer (Orange County Sanitation and City of Santa Ana), power (SC Edison), gas (SC Gas), and telephone/communication lines (AT&T Transmission & Distribution, MCI/Verizon, MPower Communications, Airtouch Cellular, and Adelphia). The Planning Center will coordinate with the Santa Ana Fire Department, Santa Ana Police Department, and Santa Ana Parks, Recreation and Community Services Agency to ensure that the appropriate agency has input regarding any potential impacts created by the proposed project. GEOTECHNICAL REPORT SUMMARY All work will be based on an office study. No drilling or sampling is proposed. It is understood that environmental issues will be dealt with by other team members. Allowance has been made for a site reconnaissance to view conditions of the existing pavement and other surface features which may Impact site preparation and grading for the widening. This will be followed by compilation and review of available information including: Seismic hazard maps, Literature on geology and seismology, County and City files, In-house data. As the project develops, it Is anticipated that there will be a requirement for discussion and/or meetings dealing with geologic hazards and geotechnical issues of significance to the project. In addition, GLA will assist with appropriate sections of the environmental documents, and will prepare a stand-alone appendix dealing with the following: Regional geology, City of Santa Ana - Proposal to Prepare Environmental Documents for Warner Avenue Widentiug Project The Planning Center I Page 10 25B-13