Parámetros a considerar en las Pruebas

Q:\RIV-19.0\3_EIR Addendum\Appendices\2005 Adopted MND\HK Elem IS.doc

Areas are classified under the Federal Clean Air Act as either “attainment” or “non-attainment” areas for each criteria pollutant based on whether the NAAQS have been achieved or not. SCAB is designated as a non-attainment area for O3, CO, and PM10.

Existing Air Quality

The proposed Helen Keller Elementary school campus would be located at the north end of

Source/Receptor Area (SRA) 23 (Metropolitan Riverside Area). The SRA 23 is one of 38 designated areas under the South Coast Air Quality Management District jurisdiction. The SCAQMD regulates air emissions in the SCAB. The communities within a given SRA are expected to have similar climatology. Additionally, similar traffic levels and the presence of local point sources contribute emissions to these areas. Subsequently, similar ambient air pollutant concentrations are expected within any given SRA. The most current five years of data monitored at these monitoring stations are included in Table 2. The data indicate that the area is sensitive to both ozone and PM10 as these standards are violated on a fairly

regular basis.

Table 2

Ambient Air Quality Monitoring Summary, Riverside-Rubidoux Monitoring Station

Pollutant/Standard Number of Days Threshold Were Exceeded and Maximum Levels During Such Violations 2000 2001 2002 2003 20041 Ozone

State 1-Hour > 0.09 ppm Federal 1-Hour > 0.12 ppm Federal 8-Hour > 0.08 ppm Max. 1-Hour Conc. (ppm) Max. 8-Hour Conc. (ppm)

42 3 26 0.140 0.112 41 7 33 0.143 0.119 56 12 35 0.155 0.124 80 18 62 0.169 0.140 2 0 0 0.105 0.082 Carbon Monoxide State 8-Hour > 9.0 ppm Federal 8-Hour > 9.5 ppm Max. 8-Hour Conc. (ppm)

0 0 4.15 0 0 3.49 0 0 3.09 0 0 3.67 0 0 2.49 Nitrogen Dioxide State 1-Hour > 0.25 ppm

Max. 1-Hour Conc. (ppm) 0 0.094 0 0.150 00.098 0 0.099 00.092

Inhalable Particulates (PM10)3

State 24-Hour > 50 µg/m3

Federal 24-Hour > 150 µg/m3

Max. 24-Hour Conc. (µg/m3₎

68 0 139 76 0 136 81 0 130 62 0 164 13 0 137

1 _{Less than 12 full months of data and may not be representative.} ppm: parts per million; µg/m3_{: micrograms per cubic meter} Source: South Coast Air Quality Management District

Sensitive Receptors

Some land uses are considered more sensitive to air pollution than others due to the types of population groups or activities involved. Sensitive population groups include children, the elderly, the acutely ill and the chronically ill, especially those with cardio-respiratory diseases. Residential areas are also

considered to be sensitive to air pollution because residents (including children and the elderly) tend to be at home for extended periods of time, resulting in sustained exposure to any pollutants present. Recreational land uses are considered moderately sensitive to air pollution. Although exposure periods to ambient air are generally short, recreational uses (e.g. running, baseball, basketball) places a high demand on respiratory functions, which can be impaired by air pollution. In addition, noticeable air pollution can detract from the enjoyment of recreation. Industrial and commercial areas are considered

3. Environmental Analysis

Elementary School No. 31 (Helen Keller)Initial Study

Riverside Unified School District• Page 37

Q:\RIV-19.0\3_EIR Addendum\Appendices\2005 Adopted MND\HK Elem IS.doc

the least sensitive to air pollution. Exposure periods are relatively short and intermittent, as the majority of the workers tend to stay indoors most of the time. In addition, the working population is generally the healthiest segment of the public.

Agriculture and vacant land surround the project site. No sensitive receptors are located adjacent to the project site.

Methodology

Projected air emissions are calculated using the URBEMIS2002 emissions model distributed by the SCAQMD. The URBEMIS model uses EMFAC2002 emissions factors for vehicle traffic. The calculated emissions of the project are compared to thresholds of significance for individual projects using the South Coast Air Quality Management District (SCAQMD) CEQA Air Quality Handbook. The SCAQMD

CEQA Air Quality Handbook recommends assessing emissions of reactive organic compounds (ROC or

ROG) as an indicator of ozone.

Thresholds of Significance

CEQA allows for the significance criteria established by the applicable air quality management or air pollution control district to be used to assess impacts of a project on air quality. The SCAQMD has established thresholds of significance for air quality for construction activities and project operation as shown in Table 3 below. (Note that the SCAQMD no longer requires quarterly thresholds for

construction emissions as they did in the past.)

Table 3

SCAQMD Threshold Of Significance

Air Pollutant Construction Phase Operational Phase

Reactive Organic Gases (ROG) 75 lbs/day 55 lbs/day Carbon Monoxide (CO) 550 lbs/day 550 lbs/day Nitrogen Oxides (NO_X) 100 lbs/day 55 lbs/day Sulfur Oxides (SOX) 150 lbs/day 150 lbs/day

Particulates (PM10) 150 lbs/day 150 lbs/day

California 1 hour and 8 hour CO standards are: • 1 hour = 20 parts per million

• 8 hour = 9 parts per million

The significance of localized project impacts depends on whether ambient CO levels in the vicinity of the project are above or below State and federal CO standards. If ambient levels are below the standards, a project is considered to have significant impacts if project emissions result in an exceedance of one or more of these standards. If ambient levels already exceed a State or federal standard, then project emissions are considered significant if they increase ambient concentrations by a measurable amount. The SCAQMD defines a measurable amount as 1.0 ppm or more for the 1-hour CO concentration or 0.45 ppm or more for the 8-hour CO concentration.

Where available, the significance criteria established by the applicable air quality management or air pollution control district may be relied upon to make the following determinations. Would the project: