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Santa Ana East Memory Lane,/Town and Country Manor E1R SCOPE OF WORK volatile organic compounds, oxides of nitrogen, carbon monoxide, sulfur dioxide, and particulate matter (PM10 and PM2.5). The regional impact assessment will calculate emissions associated with construction and longterm operational activities for the proposed project using URBEMIS2007. - Localized Significance Analysis. A Localized Significance Threshold (LST) analysis will need to be conducted for construction emissions pursuant to SCAQMD methodology. Since the amount of acreage to be disturbed by grading in one day is expected to be less than or equal to five acres, a condensed LST analysis can be done by comparing onsite project emissions of carbon dioxide, nitrogen dioxide, and particulate matter (PM10 and PM2.5) with localized thresholds as obtained from the SCAQMD LST Methodology look -up tables for the project's source receptor area - Carbon Monoxide Hot -Spot Analysis. A carbon monoxide hot -spot analysis will be conducted of up to five intersections with the highest potential for congestion using the California Department of Transportation Caline4 model and the CARB EMFAC2007 model. - Global Climate Change. A global climate change analysis will be prepared for the proposed project. Project generated emissions of greenhouse gases will be estimated using URBEMIS2007, California Air Resources Board methods, and/or U.S. Environmental Protection Agency emission factors. The General Plan or other regional planning documents will be reviewed for goals or policies that relate to global climate change. An appropriate threshold for addressing the significance of the project's influence on global climate change will be derived. If necessary, mitigation measures will be recommended. A significance finding will also be determined. - Report. A comprehensive report will be prepared that includes all necessary components of a legally defensible analysis, including background information on air quality. If necessary, mitigation measures will also be identified to reduce the level of significance. Water Quality. The MBA Water Quality specialist will prepare the water quality management plan using guidelines set forth in the County's Model WQMP, provided in DAMP (Drainage Area Management Plan). The WQMP will be submitted to the City of Santa Ana Planning and Public Works departments for review. Comments and/or changes required by the City will be addressed and the WQMP will be modified to obtain the City's final approval. MBA assumes the following documents will be available prior to the preparation of the WQMP: - Project -Specific Grading and Drainage Plan - Soils Engineering Report Hydraulic Study determining stormwater runoff from required storm frequency intensities Preparation of the WQMP will include the following tasks: Identify potential pollutants and their sources associated with the Project along with local receiving waters, identify any California Clean Water Act Section 303(d) listed receiving waters and evaluate associated impacts to the proposed project. Identify Hydrologic Conditions of Concern and evaluate if post -construction runoff volumes could have a significant impact on downstream stormwater facilities compared to existing conditions or have significant impacts on stream habitat, alone or as part of a cumulative impact from development in the watershed. 5