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• Draft Supplemental Environmental Impact Report Page IV.D-15 • Forward Inc. Landfill 2018 Revised Project • ' Ambient monitoring station for at Hazelton Street,Stockton. • 0 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;pg/m3=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 flared to the atmosphere without any beneficial • reuse. The LFGTE 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, N2,02 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. • • Potential Impacts and Mitigation Measures • Criteria of Significance • • According to Appendix G of the CEQA Guidelines a project may be deemed to have a • significant effect on the environment if it would: • • Conflict with or obstruct implementation of the applicable air quality plan(s); • • Violate any air quality standard or contribute substantially to an existing or projected air quality violation; • Result in a cumulatively considerable net increase of any criteria pollutant for which the • project region is non-attainment under an applicable federal or state ambient air quality • standard(including releasing emissions which exceed quantitative thresholds for ozone • precursors); • • Expose sensitive receptors to substantial pollutant concentrations; or • • Create objectionable odors affecting a substantial number of people. • Also, to address GHG emissions, a project may be deemed to have a significant effect on the • environment if it would: • Generate GHG emissions,either directly or indirectly, that may have a significant • impact on the environment; or • Conflict with an applicable plan, policy, or regulation adopted for the purpose of reducing the emissions of GHGs. • • • • • •