4 Documents in Project
California Environmental Protection Agency
NOD - Notice of Determination
Significant concentrations of contaminants of concern (hexavalent chromium) are present in the vadose zone at the Phibro-Tech Hazardous Waste Facility (Site) and pose a potential threat to groundwater if not remediated. The Interim Measure activities described in the Work Plan consist of in-situ remediation of soils at the Site through the injection of a calcium polysulfide (CPS) solution to stabilize hexavalent chromium. CPS injections were previously used at the Site as part of a 2012 Pilot Test to treat hexavalent chromium affected vadose zone soils and groundwater. In-situ remediation of hexavalent chromium uses chemical reduction or fixation. Chemical reduction or fixation of hexavalent chromium reduces it to the more thermodynamically stable trivalent chromium, which can precipitate or absorb to soil. A reductant such as CPS can convert the toxic and soluble hexavalent chromium into an insoluble non-toxic hydroxide compound.
DICE RD & ALAUSON AVE.
Notice of Determination
Approving Agency Role
(1) The project will have a significant impact on the environment
(2a) An Environmental Impact Report was prepared for this project pursuant to the provisions of CEQA
(2b) A Mitigated or a Negative Declaration was prepared for this project pursuant to the provisions of CEQA
(2c) An other document type was prepared for this project pursuant to the provisions of CEQA
(3) Mitigated measures were made a condition of the approval of the project
(4) A mitigation reporting or monitoring plan was adopted for this project
(5) A Statement of Overriding Considerations was adopted for this project
(6) Findings were made pursuant to the provisions of CEQA
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