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documentation regarding the organization,the plan for tree planting and completion of the purchase of the tree planting. Potential Significant Effect Without proper mitigation, the project has the potential to significantly impact air quality and global climate change from greenhouse gas emissions. Description of Specific Impact Greenhouse gas emissions were calculated for the baseline disposal rate of 425 tpd and the proposed 2,000 tpd disposal rate. The greenhouse gas emissions increase attributed to the Project is equal to the difference between the 2,000 tpd case and the baseline case. Baseline emission sources include: diesel engines used in offroad mobile source equipment; diesel engines in heavy-heavy duty trucks (HHDT) used for transport of waste material to the disposal site; and emissions from light duty motor vehicles used for employee commute and travel. The Project is not expected to result in emissions of fluorocarbons or sulfur hexafluoride. In addition to these sources, the 2,000 tpd case includes landfill gas emissions(LFG or biogas)and emission from flaring LFG. The extent to which Project emissions of greenhouse gases contribute to global warming and climate change cannot be correlated with specific impacts. The analytic tools and scientific data needed to evaluate such impacts are not available. Therefore it is not possible to predict how the increase in greenhouse gas emissions from the Project will affect local climatology within the Project area. However, the H. M. Holloway Landfill will be subject to regulations established by CARB pursuant to AB 32. The use of the flare to combust landfill gas will reduce methane to carbon dioxide. Carbon dioxide has a lower capacity to cause global warming effects. The proposed Project's estimated emissions of CO2 at 8,045.25 metric tons of CO2 equivalent,5,551.6894 metric tons CO2 equivalent of methane, and 36.5592 metric tons CO2 equivalent of nitrous oxide, have been calculated as the Project impacts of greenhouse gas emissions and contribution to global climate change. The total emissions is calculated at 13,633.4986 CO2 equivalent metric tons. At this time there are no established thresholds or guidelines for the project level of greenhouse gases that should be considered significant. While Senate Bill 97 directs the Governor's Office of Planning and Research (OPR)to develop such guidance, at the time of circulation of this document, there has been no direction. In the absence of a threshold and evidence in the record of the appropriate nexus between a site specific project and global climate change the project level effects are considered less than significant. Findins Changes or alterations have been required in, or incorporated into the project that substantially lessen the potentially significant effect as identified in the Final EIR, so that environmental effects after such mitigation are reduced to a less than significant level. Brief Explanation of the Rationale for the Finding Pursuant to Public Resources Code Section 21081(a)(1), the Board of Supervisors finds that the project's adherence to mitigation measures 4.1-4 and 4.1-5 will reduce the potential impact of this significant effect to a less than significant level. -- - .. -...- _.. ... ... .. .........- ---------- .._.......... __. .._..._.... ...................... Findings of Fact—Section 15091 March 15,2016 H.M.Holloway Landfill Modification Project Final Board of Supervisors 7