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Example 1: Modesto Irrigation District (SJVAPCD, 2003) <br /> SOx for PM,o <br /> Ratio proposed: 1.0:1.0 <br /> Rationale: <br /> 1. Annual average nitrate, sulfate,chloride, and total PM10 ambient air <br /> measurements used to partially speciate the PM1o. <br /> 2. Unspeciated PM10 split between direct-combustion-related PM10 (fuel <br /> combustion and mobile sources) and other direct PM10 sources <br /> a. Direct-combustion-related PM10 based on Chemical Mass Balance <br /> modeling performed for the District's PM10 attainment demonstration <br /> plan (24-hour models). <br /> 3. Annual average direct-combustion PM10 concentration is divided by total annual <br /> direct-combustion PM10 emissions from district-wide inventory. <br /> 4. Annual average sulfate concentration is divided by total annual SO2 emissions <br /> from district-wide inventory. <br /> 5. Ratio of (3) to (4) represents the amount of SO2 reductions needed to have <br /> equivalent impact on PM10 concentrations as reducing 1 TPY of directly emitted <br /> combustion PM1o. <br /> Example 2: Pastoria Energy Facility(SJVAPCD, 2005) <br /> NOx for PMjo <br /> Ratio proposed: 2.16:1 <br /> 1. Direct-combustion-related PM10 based on Chemical Mass Balance modeling <br /> performed for the District's PM10 attainment demonstration plan(24-hour <br /> models). <br /> 2. Annual average direct-combustion PM10 concentration (attributed to industry) is <br /> divided by total annual direct-combustion PM10 emissions (from industry) from <br /> district-wide inventory. <br /> 3. Annual average nitrate concentration(attributed to local [county] sources) is <br /> divided by total annual NOx emissions from countywide inventory. <br /> 4. Ratio of (2) to (3) represents the amount of NO2 reductions needed to have an <br /> equivalent impact on PM10 concentrations as reducing 1 TPY of directly emitted <br /> combustion PM1o. <br />