Laserfiche WebLink
Rubber Tired Dozers 0.5 <br />Scrapers I <br />Based on this table, the proposed will result in a maximum of 1 acre disturbed during peak <br />construction grading activity (1 dozer x 0.5 + I grader x 0.5 = I acres disturbed). <br />Per LST guidance, only on -site construction activity is considered in the LST analysis. On -site <br />construction emissions are provided in the CalEEMod output files and do not include sources <br />such as on -road haul, worker commuting or vendor delivery emissions. Therefore, the following <br />thresholds and emissions are determined (pounds per day). <br />LST and Project Emissions <br />CalEEMod Output in Appendix (maximum mitigated emissions from on -site construction) <br />LSTs were compared to the maximum daily construction activities. As seen above, emissions <br />are below the LST for construction. The only mitigation measure applied was the following dust <br />suppression measure: <br />• Water exposed surfaces at least 3 times per day for fugitive dust suppression <br />Facilities such as churches are not included in the definition of sensitive receptor because church <br />employees do not typically remain on site for a fiill 24 hours, but are present for shorter periods <br />of time, such as eight hours. However, by applying a 24 -hour standard for pollutants with shorter <br />averaging periods, such as NO2 and CO, LSTs could also be applied to these receptors since it is <br />reasonable to assume that an employee at these sites could be present for periods of one to eight <br />hours. The Orange County Southern Baptist Church is immediately east of the site. Therefore, <br />comparing LSTs for CO and NOx for a source receptor distance of 25 meters would provide the <br />comparison (pounds per day). Again, LST emissions are much less than significance thresholds. <br />19111 E 1'SSAQ <br />CO <br />NOx <br />PM -10 <br />PM -2.5 <br />LST Thresholds Central <br />Orange County <br />1 acre, 200 meters <br />2,109 <br />123 <br />60 <br />22 <br />Max On -Site Emissions <br />Demolition <br />Unmitigated <br />25 <br />42 <br />6 <br />2 <br />Mitigated <br />25 <br />42 <br />3 <br />2 <br />Grading <br />Unmitigated <br />20 <br />31 <br />8 <br />5 <br />Mitigated <br />20 <br />31 <br />4 <br />3 <br />Construction <br />Unmitigated <br />19 <br />25 <br />2 <br />2 <br />Mitigated <br />19 <br />25 <br />2 <br />2 <br />CalEEMod Output in Appendix (maximum mitigated emissions from on -site construction) <br />LSTs were compared to the maximum daily construction activities. As seen above, emissions <br />are below the LST for construction. The only mitigation measure applied was the following dust <br />suppression measure: <br />• Water exposed surfaces at least 3 times per day for fugitive dust suppression <br />Facilities such as churches are not included in the definition of sensitive receptor because church <br />employees do not typically remain on site for a fiill 24 hours, but are present for shorter periods <br />of time, such as eight hours. However, by applying a 24 -hour standard for pollutants with shorter <br />averaging periods, such as NO2 and CO, LSTs could also be applied to these receptors since it is <br />reasonable to assume that an employee at these sites could be present for periods of one to eight <br />hours. The Orange County Southern Baptist Church is immediately east of the site. Therefore, <br />comparing LSTs for CO and NOx for a source receptor distance of 25 meters would provide the <br />comparison (pounds per day). Again, LST emissions are much less than significance thresholds. <br />19111 E 1'SSAQ <br />