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2015-016 - The Bristol Street Widening Project
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2015-016 - The Bristol Street Widening Project
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4/22/2015 2:53:15 PM
Creation date
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City Clerk
Doc Type
Resolution
Doc #
2015-016
Date
4/7/2015
Destruction Year
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ENVIRONMENTAL IMPACT REPORTADDENDUM <br />Bristol Street Widening Project Warner Ave to Saint Andrew Place (Phase IV) <br />TABLE 6 LOCALIZED SIGNIFICANCE THRESHOLDS ANALYSIS FOR CONSTRUCTION <br />ACTIVITIES <br />Intersection Hot -Spots <br />While the proposed Project would not result in any direct sources of localized emissions due to the roadway <br />street lighting being powered by electricity, changes in LOS or traffic volumes due to the project may cause <br />indirect sources of localized emissions. While emissions of motor vehicles have improved due to more <br />stringent vehicle emissions standards and the use of cleaner burning fuels, they continue to be the primary <br />source of local emissions within the study area. Localized areas where ambient concentrations exceed <br />national and /or state standards for CO are known as hotspots. The SCAQMD defines typical sensitive <br />receptors as residences, schools, playgrounds, childcare centers, athletic facilities, long -term health care <br />facilities, rehabilitation centers, convalescent centers, and retirement homes. <br />Because CO is produced in greatest quantities from vehicle combustion and does not readily disperse into the <br />atmosphere, adherence to AAQS is typically demonstrated through an analysis of localized CO <br />concentrations. Areas of vehicle congestion have the potential to create pockets of CO called "hot spots." <br />These pockets have the potential to exceed the state one -hour standard of 20 ppm or the eight -hour standard <br />of 9.0 ppm. Note that the federal levels are based on one- and eight -hour standards of 35 and 9 ppm, <br />respectively. Thus, an exceedance condition would occur based on the state standards before the federal <br />standards. <br />The following intersections were modeled for CO hotspots: <br />• Bristol Street and Warner Avenue <br />• Bristol Street and Glenwood Place <br />• Bristol Street and St. Andrew Place <br />• Bristol Street and W. Edinger Avenue <br />As shown in Table 7, both the 1 -hour and 8 -hour CO concentrations at the intersections that were affected by <br />the proposed project would be substantially below the California and federal ambient air quality standards for <br />CO, potential CO impacts related to the project alternatives are below AAQS and would not result in a <br />significant air quality impact from CO hotspots. <br />ANA 305 -194 (PER 02) CSA (AUGUST 2014) 133867 YU 30 <br />LI UTA�fi(L <br />f.ud) <br />t)( �Rl1Tl PMFlSE <br />NOx <br />CO <br />PM10 <br />PM25 <br />x r. r <br />Demolition <br />61 <br />40 <br />4 <br />3 <br />Grading <br />52 <br />30 <br />5 <br />4 <br />Trenching <br />33 <br />19 <br />2 <br />2 <br />Paving <br />15 <br />1 11 <br />1 1 <br />1 1 <br />SCAQMD Threshold <br />183 <br />1,253 <br />13 <br />7 <br />Exceeds Threshold? <br />No <br />No <br />No <br />No <br />Source: URS Corporation, January 2013. <br />Intersection Hot -Spots <br />While the proposed Project would not result in any direct sources of localized emissions due to the roadway <br />street lighting being powered by electricity, changes in LOS or traffic volumes due to the project may cause <br />indirect sources of localized emissions. While emissions of motor vehicles have improved due to more <br />stringent vehicle emissions standards and the use of cleaner burning fuels, they continue to be the primary <br />source of local emissions within the study area. Localized areas where ambient concentrations exceed <br />national and /or state standards for CO are known as hotspots. The SCAQMD defines typical sensitive <br />receptors as residences, schools, playgrounds, childcare centers, athletic facilities, long -term health care <br />facilities, rehabilitation centers, convalescent centers, and retirement homes. <br />Because CO is produced in greatest quantities from vehicle combustion and does not readily disperse into the <br />atmosphere, adherence to AAQS is typically demonstrated through an analysis of localized CO <br />concentrations. Areas of vehicle congestion have the potential to create pockets of CO called "hot spots." <br />These pockets have the potential to exceed the state one -hour standard of 20 ppm or the eight -hour standard <br />of 9.0 ppm. Note that the federal levels are based on one- and eight -hour standards of 35 and 9 ppm, <br />respectively. Thus, an exceedance condition would occur based on the state standards before the federal <br />standards. <br />The following intersections were modeled for CO hotspots: <br />• Bristol Street and Warner Avenue <br />• Bristol Street and Glenwood Place <br />• Bristol Street and St. Andrew Place <br />• Bristol Street and W. Edinger Avenue <br />As shown in Table 7, both the 1 -hour and 8 -hour CO concentrations at the intersections that were affected by <br />the proposed project would be substantially below the California and federal ambient air quality standards for <br />CO, potential CO impacts related to the project alternatives are below AAQS and would not result in a <br />significant air quality impact from CO hotspots. <br />ANA 305 -194 (PER 02) CSA (AUGUST 2014) 133867 YU 30 <br />
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