Categorical Exclusion Determination
Office of NEPA Policy and Compliance
November 9, 2017
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The purpose of the proposed project is to install a granulated activated carbon filtration system to treat the Hetch Hetchy surface water received onsite. The current Site 300 ground water supply is not desirable due to: 1) high mineral contents causing excessive cooling tower scaling 2) potential communication between contaminated upper aquifers and well water and 3) reliability of current well system. In order to address these concerns, granulated activated carbon filtration is necessary to continue use of the Hetch Hetchy water supply. The ground water system at Site 300 would be used as a redundant backup system.