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January 18, 2021
Comment to CA Department of Toxic Substances Control (DTSC) by February 11, 2021
An investigation into the So Cal Gas/Ventura MGP (56490101) revealed the presence of residual MGP wastes that may require remediation. Concentrations of some volatile organic compounds (VOCs) in soil vapor samples exceeded screening levels. A draft Removal Action Workplan (RAW) was released last week.
How does the draft RAW propose to clean up the Site?
The recommended alternatives include:
• Excavation of approximately 1,700 cubic yards (2,500 tons) of shallow soil impacted with carcinogenic
PAHs, TPH, arsenic, and lead.
• Offsite transport of excavated soil for treatment and/or disposal (approximately 106 truck trips).
• Backfill of the excavated areas using clean fill material (approximately 106 truck trips).
• Implementation of the Operations and Maintenance Plan to address vapor intrusion risks within the
proposed compressor building.
• Implementation of a Land Use Covenant to prevent residential development or other sensitive uses.
DTSC says according to CEQA law, the proposed removal action will not have a significant negative impact on human health and the environment.
Documents are available on the Envirostor database online: https://www.envirostor.dtsc.ca.gov/public/profile_report.asp?global_id=56490101
DTSC invites the public to review and provide comments on the draft “RAW” workplan by February 11, 2021, and will address the comments before approving the Removal Action Workplan (RAW).
The Location:
E of Hwy 33, S of Stanley, W of Olive, W end of McFarlane (a densely populated low-income neighborhood), and one long block W of Lalo’s
The Pollution:
CALENVIROSCREEN PERCENTILE SCORE for that census tract: 76-80%
PAST USE(S) THAT CAUSED CONTAMINATION: MANUFACTURED GAS PLANT (MGP), MANUFACTURING – PETROLEUM
POTENTIAL CONTAMINANTS OF CONCERN:
POLYNUCLEAR AROMATIC HYDROCARBONS (PAHS)
TPH-MOTOR OIL
TPH-DIESEL
TPH-GAS<b < td=””></b <>
POTENTIAL MEDIA AFFECTED: OTHER GROUNDWATER AFFECTED (USES OTHER THAN DRINKING WATER), SOIL
CLEANUP STATUS: ACTIVE AS OF 3/28/2003
BACKGROUND
| Manufactured Gas Plant operations began in 1905. An ice factory and an electrical light works had been operating on the site. The plant was then sold to Ventura County Power Company in 1907 who continued to operate the facility until 1917. The property was then sold to Southern California Edison (Edison) which owned and operated the gas plant until its sale to the Southern Counties Gas Company in 1919. The MGP was subsequently removed from service in 1920. Beginning in 1923, Southern Counties began installing a wide variety of compressor station equipment to upgrade the site. The additions included water cooling towers, extensions to a few existing buildings, oil tanks, new fuel lines, a pump house and pumps, a storehouse, gas engines, a blacksmith shop, a firehouse, a concrete wash rack, and a repair garage. This same year Southern Counties began leasing much of the western portion of the site to Seaside Oil Company. Seaside Oil operated on this property until 1969 and used it for the refining and storage of gasoline, kerosene, and lubricating oils, and the manufacturing of asphalt. The portion of the site not leased to Seaside Oil continued to be used for the Compressor Station. Since this time the site has been redeveloped for many different uses including commercial, light industrial, oil refinery operations, and transportation land uses. These uses include office buildings, warehouse spaces, indoor and outdoor manufacturing areas, exterior storage yards, parking lots, and public transportation right-of-ways.
The Gas Co. submitted a draft Removal Action Plan in 9/2020 and DTSC commented and approved to open Public Comment Period after the comments were addressed properly. A project to modernize the existing compressor station is planned. In certain areas, contaminated soil down to an estimated 3 ½ feet will be removed and replaced with clean fill soil. The area designated for cleanup has been identified and agreed upon by DTSC and SoCalGas. It is approximately 8.5-acres and is owned and operated by SoCalGas as a natural gas compressor station. The subject of this RAW is the southern 4.3-acre portion of the Site which is currently in use as a storage and maintenance yard. It is occupied by two small buildings used as an office and a warehouse. The northern portion of the Site is currently occupied by a natural gas compressor building, gas metering equipment, aboveground gas piping, and associated features. Investigations and Findings |
