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was granted in accordance with WDR Order No. 97-078, contingent upon the installation of a groundwater monitoring system at each pit, prior to waste discharge. Note, that the RWQCB are currently revising the WDRs to reclassify the mine pits as a Class III landfill for discharge of industrial waste(Volume I,Appendix 1). In July 2003, a "Liner Performance Report" for Pits "E," "F," and "G" (Hersh Consulting 2003a) was submitted to the RWQCB for review and approval(see Appendix D). The report covered the period from December 1993 through March 2003. This report is currently under review by the RWQCB staff. The purpose of the report was to demonstrate that the facility's characteristics are adequate to meet the Class III non-municipal solid waste (MSW), non-hazardous waste landfill (known as a Class III Industrial Waste landfill) siting and geologic criteria and construction standards contained in Title 27 California Code of Regulations (CCR), and that a liner would not be required. The RWQCB's findings regarding Pits "E," "F," and"G's" suitability will be incorporated into the revised WDR that will be issued for the proposed Project. In order for the proposed waste discharges to occur,the subject Pits will either have to be found to be in compliance with these criteria, or else provide a conforming liner. Otherwise the proposed waste discharges would not be authorized. In 2004 a Supplementary Characterization Report "F&G Connection" Pit to the Site Characterization Report for Pits "F"and"G"was prepared (Hersh Consulting 2004a)(see Appendix E-1). The purpose of the report was to demonstrate Pit F/G.characteristics are adequate to meet the Class III non-MSW, non- hazardous waste landfill siting and geologic criteria and construction standards.contained in Title 27 CCR, and that a liner would not be required. This report was submitted in July 2004 to the RWQCB. The RWQCB's findings regarding the Pit"F/G Connection Area's" suitability will be incorporated into a revised WDR for the proposed Project. In order for the proposed waste discharges to occur, the subject Pit will either have to be found to be in compliance with these criteria, or else provide a conforming liner. Otherwise the proposed waste discharges will not be authorized. The inclusion of biosolids in the permitted waste streams will require Project design and operation mitigations to assure that no degradation of ground water will occur. Such mitigations must include both supplemental protection against groundwater infiltration from disposal leachate and protection against groundwater degradation from washout of biosolids delivery trucks and Project equipment serving the biosolids disposal area. These activities constitute a potentially significant impact which must be mitigated. Finding 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 the following mitigation measures will reduce the potential impact of this significant effect to a less than significant level: MM 4.6-1. a) The proposed Project waste streams cannot be subject to the disposal reporting systems. The Project must demonstrate that it meets the applicable state regulations for waste landfill Findings of Fact—Section 15091 March 15,2016 H.M.Holloway Landfill Modification Project Final Board of Supervisors 41