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Draft Supplemental Environmental Impact Report Page IV.D-15 Forward Inc. Landfill 2018 Revised Project Table IV.D-2: Air Quality Data Summary (2012-2016) For the Project Area' Monitoring Data by Year VMML A Pollutant CAAQS/ NAAQSZ 2012 2013 2014 2015 2016 Ozone Highest 1-Hour Average(ppm)3 0.09/- 0.097 0.080 0.090 0.094 0.102 Days of Exceedance 1 0 0 0 2 Highest 8-Hour Average(ppm)3 0.070/0.070 0.083 0.067 0.077 0.078 0.078 Days of Exceedance 5 0 4 2 2 Particulate Matter(PMlo) Highest 24-Hour Average(Mg/m')' 50/150 70.0 95.5 94.0 55.3 66.5 Estimated Days of Exceedance 17.9 58.2 18.0 24.5 30.6 Annual Average(µg/m3)3 20/- 22.8 32.0 24.5 28.0 26.5 Particulate Matter(PM25) Highest 24-Hour Average(µg/m3)3 -/35 60.4 66.5 56.8 58.8 43.7 Days of Exceedance 6.0 27.6 16.0 12.2 4.0 Annual Average(u g/m3)3 12/15 12.4 NA 12.3 12.3 NA SOURCE:CARB Air Quality Data Statistics(htto://www.arb.ca.gov/adam welaomehtml),2012-2016. NOTES:Values in bold underline are in excess of applicable standard.NA means data was not available for the given year. ' Ambient monitoring station for at Hazelton Street,Stockton. 2 California Ambient Air Quality Standards are not to be exceeded and National Ambient Air Quality Standards are not to be exceeded more than once per year. 3 ppm=parts per million;µg/ms=micrograms per cubic meter. A landfill gas to energy (LFGTE)plant operated in the northeast portion of the project site by Ameresco. The LFGTE converts landfill gas, a waste byproduct of landfill operations,into a useful energy source that would otherwise be destroyed through flaring without any beneficial reuse. The LFGTE plant produces approximately 4.2 MW of energy, enough to power approximately 6,000 to 8,000 single family homes every day. Ameresco is planning an upgrade to the existing LFGTE facility to meet PG&E's Rule 21 pipeline quality requirements for renewable natural gas from landfills. The process would treat gas that is compressed to around 100 to 200 psig. The process would remove CO2, N2,Oz and other trace constituents to increase the quality of the landfill gas. It is currently anticipated that the equipment required for this upgrade process would be located in the region of the former Covanta LFGTE plant, which was located near the western property boundary just south of the realigned north creek. The operational need for the LFGTE upgrade is independent of the proposed expansion.