Injection of Calcium Polysulfide to Remediate Hexavelant Chromium in Groundwater and Soil, Torrance
2 Documents in Project
Summary
SCH Number
2005121174
Lead Agency
Regional Water Quality Control Board, Region 4 (Los Angeles)
Document Title
Injection of Calcium Polysulfide to Remediate Hexavelant Chromium in Groundwater and Soil, Torrance
Document Type
NOD - Notice of Determination
Received
Posted
3/22/2006
Present Land Use
Heavy Industrial
Document Description
Exxon Mobil operates a refinery, including a tank farm and distribution facility, on 750 acres in the City of Torrance. Regular monitoring required under Cleanup and Abatement Orders (CAO) 85-17, 89-136 and 95-116, detected chromium VI in 2000. Characterization of the 350 x 150 foot area with 56 cores, penetrometer tests or wells found Chromium VI levels as high as 200 mg/L in the groundwater and 95.9 mg/kg in the soil.
Exxon Mobil proposed remediation using injection of Calcium Polysulfide which reduces the chromium VI into the non-toxic chromium III in the soil and groundwater underlying at about 70 feet.
Contact Information
Name
Elizabeth Erickson
Agency Name
Regional Water Quality Control Board, Region 4 (Los Angeles)
Contact Types
Lead/Public Agency
Phone
Location
Cities
Torrance
Counties
Los Angeles
Cross Streets
Madronna and Del Amo
Zip
90504
Total Acres
<1
Parcel #
7352-012-017 Lot 3
State Highways
405
Notice of Determination
Approving Agency
California Regional Water Quality Control Board, Los Angeles Reg
Approving Agency Role
Lead Agency
Approved On
Determinations
(1) The project will have a significant impact on the environment
No
(2a) An Environmental Impact Report was prepared for this project pursuant to the provisions of CEQA
No
(2b) A Mitigated or a Negative Declaration was prepared for this project pursuant to the provisions of CEQA
Yes
(2c) An other document type was prepared for this project pursuant to the provisions of CEQA
No
(3) Mitigated measures were made a condition of the approval of the project
Yes
(4) A mitigation reporting or monitoring plan was adopted for this project
N/A
(5) A Statement of Overriding Considerations was adopted for this project
No
(6) Findings were made pursuant to the provisions of CEQA
N/A
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