Pacific Gas and Electric Company (PGE), Former Manufactured Gas Plant Low Risk Groundwater Closure Report

4 Documents in Project

Summary

SCH Number
2003012103
Lead Agency
Toxic Substances Control, Department of (Department of Toxic Substances Control)
Document Title
Pacific Gas and Electric Company (PGE), Former Manufactured Gas Plant Low Risk Groundwater Closure Report
Document Type
NOD - Notice of Determination
Received
Posted
6/17/2016
Present Land Use
The Site is currently zoned for heavy commercial/light industrial use. One area of the Site is currently used as a natural gas regulating station.

Document Description
DTSC approved a Low Risk Groundwater Closure Report pursuant to the authority granted under the CA Health and Safety Code, Ch. 6.8 and the Federal Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), Section 121 for the PGE, Former Manufactured Gas Plant (MGP) site. The approved Low Risk Groundwater Closure Report would modify the existing Remedial Action Plan that addressed soil and groundwater contamination at the Site which was approved by DTSC in a letter dated April 21, 2003. The RAP included soil excavation and disposal of contaminated soils by truck transportation to an off-site disposal facility, on-going groundwater monitoring activities in a network of Site related monitoring wells, and land use controls for the Site. Waiver of groundwater remedial action goals. Under the proposed revision to the remedy, cleanup goals for TPH-d and TPH-g would be waived as requirements for closure based on low risk principles. The cleanup goal concentration for the two constituents in groundwater as determined in the RAP have not yet been achieved in all monitoring wells (TPH-g goal: 50ug/L and TPH-d goal: 100ug/L). However, the Low Risk Report demonstrates that the project groundwater cleanup goals have been met consistently in all monitoring wells for more than five years for all constituents of concern except TPH-g and TPH-d. Only four wells (MW-1D, MW-1S, MW-8S, and MW 14S) have dissolved TPH above the goals. Statistically defensible time versus concentration trends indicate that cleanup will be achieved in two of these wells (MW 8S and MW-14S) in two years or less. Results of many years of quarterly monitoring indicate that remediation is proceeding gradually via natural biodegradation in groundwater. The plume of residual petroleum hydrocarbon groundwater is decreasing in size. Ongoing, naturally occurring biodegradation will achieve groundwater cleanup goals within a reasonable timeframe.

Contact Information
Leona Winner
California Department of Fish and Game
8800 Cal Center Drive
Sacramento, CA 95826

Phone : (916) 255-6679

Location

Cities
Redding
Counties
Shasta
Cross Streets
SE corner of South Street and Waldon Street
Zip
96001
Total Acres
0.4 acres
Parcel #
101-750-33; 101-750-35; 101-750-35; 101-750-36
State Highways
299 and I-5
Railways
Union Pacific Railroad
Waterways
Sacramento River
Township
32N
Range
5W
Section
36

Notice of Determination

Approving Agency
DTSC
Approving Agency Role
Lead Agency
Approved On
Final Environmental Document Available at
8800 Cal Center Drive, Sacramento, CA 95826

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
No
(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
No

Disclaimer: The document was originally posted before CEQAnet had the capability to host attachments for the public. To obtain the original attachments for this document, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at state.clearinghouse@opr.ca.gov or via phone at (916) 445-0613.

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