P & D CONSULTANTS - 2002 - Laserfiche WebLink

Home Browse Search

Grand Avenue Widening Project Environmental Impact Report Section 3.0 TABLE 3.4-1 EXISTING AIR QUALITY LEVELS MEASURED AT THE SOURCE RECEPTOR AREA 17 AIR QUALITY MONITORING STATION Notes: 1. PM10 samples were collected every six days. The percentages refer to the percent of samples exceeding the standard and not the number of days per year that the standard was exceeded. 2. ppm—parts per million. 3. Data presented are valid, but incomplete in that an insufficient number of valid data points were collected to meet EPA and/or CARB criteria for representatives. Sources: South Coast Air Quality Management District and Mestre Greve Associates (2001). CO is another important pollutant that is due largely to motor vehicles. High levels of CO commonly occur near major roads and freeways. CO levels in the region and in the Grand Avenue project area are currently within both the state and federal AAQS. However, CO may potentially be a problem in the future for areas adjacent to freeways and other major roads. The state standards for PMio have been exceeded consistently in Source Receptor Area 17, for approximately four percent of the days measured in 2000, 25 percent of the days measured in 1999 and 20 percent of the days measured in 1998. PMte levels in this area are due to natural sources, grading operations and motor vehicles. According to the EPA, some people are much more sensitive than others to breathing fine particles or PMio. People with influenza, chronic respiratory and cardiovascular diseases, and the elderly may suffer worsening illness and premature death due to breathing PMte. Other groups considered sensitive include smokers, people who cannot breathe well through their noses and exercising athletes who may breathe through their mouths. PMI a levels have decreased significantly in the last three years. Other than the 03 and PMio exceedances in Source Receptor Area 17 described above, no federal or state AAQS were exceeded for the other criteria pollutants, as shown earlier in Table 3.4-1. F.•IPROJ-ENMGrand eirlNew Text - GrandlSection 3 SpliMection 3.4.doc Page 3.4-4 California National Maximum Level Days State Std. Pollutant Standard 2 Standard 2 Year Exceed Ozone (03) 0.09 ppm 0.12 ppm 2000 0.13 9 for 1 hour for I hour 1999 010 (3) 1 (3) 1998 0.14 10 Carbon Monoxide 20 ppm 35 ppm 2000 7.3 0 (CO) for 1 hour for 1 hour 1999 8.3(3) 0 (3) 1998 7.9 0 Carbon Monox de 9.0 ppm 9 ppm 2000 4.7 0 (CO) (3) for 8 hours for 8 hours 1999 5.3 0 1998 5.3 0 Particulates (PMio) 50 ug/m 150 ug/n? 2000 126 15(4-1.) for 24 hours for 24 hours 1999 122f 90 (25%) (3) 1998 81t 72(20% (3) Nitrogen Dioxide 0.25 ppm 0.053 ppm 2000 0.11 0 (NO2) for 1 hour AAM 1999 0.12 0 1998 0.14 0 Notes: 1. PM10 samples were collected every six days. The percentages refer to the percent of samples exceeding the standard and not the number of days per year that the standard was exceeded. 2. ppm—parts per million. 3. Data presented are valid, but incomplete in that an insufficient number of valid data points were collected to meet EPA and/or CARB criteria for representatives. Sources: South Coast Air Quality Management District and Mestre Greve Associates (2001). CO is another important pollutant that is due largely to motor vehicles. High levels of CO commonly occur near major roads and freeways. CO levels in the region and in the Grand Avenue project area are currently within both the state and federal AAQS. However, CO may potentially be a problem in the future for areas adjacent to freeways and other major roads. The state standards for PMio have been exceeded consistently in Source Receptor Area 17, for approximately four percent of the days measured in 2000, 25 percent of the days measured in 1999 and 20 percent of the days measured in 1998. PMte levels in this area are due to natural sources, grading operations and motor vehicles. According to the EPA, some people are much more sensitive than others to breathing fine particles or PMio. People with influenza, chronic respiratory and cardiovascular diseases, and the elderly may suffer worsening illness and premature death due to breathing PMte. Other groups considered sensitive include smokers, people who cannot breathe well through their noses and exercising athletes who may breathe through their mouths. PMI a levels have decreased significantly in the last three years. Other than the 03 and PMio exceedances in Source Receptor Area 17 described above, no federal or state AAQS were exceeded for the other criteria pollutants, as shown earlier in Table 3.4-1. F.•IPROJ-ENMGrand eirlNew Text - GrandlSection 3 SpliMection 3.4.doc Page 3.4-4