Dow Chemical Company - Class-II Permit Modification
Summary
SCH Number
2007058078
Public Agency
California Department of Toxic Substances Control
(DTSC)
Document Title
Dow Chemical Company - Class-II Permit Modification
Document Type
NOE - Notice of Exemption
Received
Posted
5/8/2007
Document Description
The Dow Chemical Company was required to modify its closure plan and close the hazardous waste management units after it has expired on July 28, 2006. On November 22, 2005, the facility notified DTSC that they intend to close the facility. DTSC reviewed the modified closure plan of 1992, and determined that the closure plan is not up to the current standards. The permitted units include Drum/Container Storage Area, two boilers, and tank T-307.
DTSC provided comments to the facility on July 17, 2006. Subsequently, Dow Chemical Company submitted a revised closure plan on September 28, 2006. A comment period was from October 9, 2006 to December 8, 2006. Dow held a public meeting for the Class-II Permit Modification of the Closure Plan on November 8, 2006.
The revised 2006 Closure Plan includes the following to the 1992 Modified Closure Plan:
1. Use of Method 5035 for collection of volatile organic compound samples;
2. Deletion of one regulated unit T-41 from the text in the closure plan, which has been clean-closed;
3. Scaling back soil matrix samplings and moving background soil sample locations;
4. Deletion of all language indicating wastes will be burned in the boilers prior to closure activities;
5. Additional wipe sampling to demonstrate that both the operations equipment to be removed and the sampling equipment used during closure sampling are decontaminated.
Contact Information
Name
Vu Nguyen
Agency Name
Department of Toxic Substances Control
Contact Types
Lead/Public Agency
Phone
Location
Cities
Torrance
Counties
Los Angeles
Notice of Exemption
Exempt Status
Other
Type, Section or Code
Section 15061(b)(3)
Reasons for Exemption
The changes to the Closure Plan apply more stringent sampling criteria to the facility for the closure. The sampling activities themselves will not result in potential for significant effects to the environment. Other closure activities remain as approved in 1996.
The facility is on the Hazardous Waste and Substances Sites List pursuant to Government Code Section 65962.5 due to possible residual contamination from releases from an underground solvent storage tank. While the tank has been removed, ongoing investigation is being conducted under RCRA as to the extent of any residual contamination. A RCRA Facility Investigation (RFI) is in progress. The tank was not directly related to the operation of the units being closed.
Conditions of this modification require the facility to enter into a corrective action consent agreement with DTSC for investigation and remediation of all former units within 180 days of the certification of closure for the permitted units. Conditions of this modification also require the facility to maintain the financial assurance mechanisms for the facility until it is replaced by the financial assurance mechanisms that are required by DTSC for any necessary corrective action work for the facility.
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