1. CO Levels were determined elsewhere to be below NAAQS limits, so were not modeled.

2. A value of 0.00 indicates a concentration of less than 0.01 ug/m3.

3. GEP = General Engineering Practice.

Fig. 16-6 Example of a Summary of Air Dispersion Modeling Results. Source: TA Engineering a pollutant in an attainment area, or a significant modification of an existing major source in such an area. The steps in a PSD review are similar to, but more elaborate than, those for state minor source review and are standardized because they originate in the Act.

A source in an attainment area is considered major if it falls within one of the 28 categories listed in the Act and has the PTE of 100 tpy of a regulated pollutant, or, if unlisted, has the PTE of 250 tpy of any regulated pollutant. If the source meets the major source emissions threshold for any one regulated pollutant, it is considered a major source for that pollutant and PSD review is triggered. In addition, PSD review is triggered by any change to any existing major source that constitutes a "major modification" because it has an emissions increase of any regulated pollutant greater than those shown in Table 161.

Table 16-1 PSD Significant Increase

Pollutant Emissions Rates (tpy)

Sulfur Dioxide (SO2)

Renewable Energy 101

Renewable Energy 101

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.

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