75A - PH - 1901 E FIRST ST - Laserfiche WebLink

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Rubber Tired Dozers 0.5 Sera ers I Based on this table, the proposed will result in a maximum of 1 acre disturbed during peak construction grading activity (1 dozer x 0.5 + I grader x 0.5 = I acres disturbed). Per LST guidance, only on -site construction activity is considered in the LST analysis. On -site construction emissions are provided in the CalEEMod output files and do not include sources such as on -road haul, worker commuting or vendor delivery emissions. Therefore, the following thresholds and emissions are determined (pounds per day). LST and Project Emissions CalEEMod Output in Appendix (maximum mitigated emissions from on -site construction) LSTs were compared to the maximum daily construction activities. As seen above, emissions are below the LST for construction. The only mitigation measure applied was the following dust suppression measure: • Water exposed surfaces at least 3 times per day for fugitive dust suppression Facilities such as churches are not included in the definition of sensitive receptor because church employees do not typically remain on site for a full 24 homy, but are present for shorter periods of time, such as eight hours. However, by applying a 24 -hour standard for pollutants with shorter averaging periods, such as NO2 and CO, LSTs could also be applied to these receptors since it is reasonable to assume that an employee at these sites could be present for periods of one to eight hours. The Orange County Southern Baptist Church is immediately east of the site. Therefore, comparing LSTs for CO and NOx for a source receptor distance of 25 meters would provide the comparison (pounds per day). Again, LST emissions are much less than significance thresholds. 1901 E 1 -51, AQ 75A -168 CO NOx PM -10 PM -2.5 LST Thresholds Central Orange County 1 acre 200 meters 2,109 123 60 22 Max On -Site Emissions Demolition Unmitigated 25 42 6 2 Mitigated 25 42 3 2 Grading Unmitigated 20 31 8 5 Mitigated 20 31 4 3 Construction Unmiti ated 19 25 2 2 Mitigated 19 25 2 2 CalEEMod Output in Appendix (maximum mitigated emissions from on -site construction) LSTs were compared to the maximum daily construction activities. As seen above, emissions are below the LST for construction. The only mitigation measure applied was the following dust suppression measure: • Water exposed surfaces at least 3 times per day for fugitive dust suppression Facilities such as churches are not included in the definition of sensitive receptor because church employees do not typically remain on site for a full 24 homy, but are present for shorter periods of time, such as eight hours. However, by applying a 24 -hour standard for pollutants with shorter averaging periods, such as NO2 and CO, LSTs could also be applied to these receptors since it is reasonable to assume that an employee at these sites could be present for periods of one to eight hours. The Orange County Southern Baptist Church is immediately east of the site. Therefore, comparing LSTs for CO and NOx for a source receptor distance of 25 meters would provide the comparison (pounds per day). Again, LST emissions are much less than significance thresholds. 1901 E 1 -51, AQ 75A -168