Clean Harbors Westmorland Hazardous Waste Disposal Facility, Class II Permit Modification to Incorporate Changes to Existing Groundwater and Vadose Zone Monitor


SCH Number
Lead Agency
Toxic Substances Control, Department of (Department of Toxic Substances Control)
Document Title
Clean Harbors Westmorland Hazardous Waste Disposal Facility, Class II Permit Modification to Incorporate Changes to Existing Groundwater and Vadose Zone Monitor
Document Type
NOE - Notice of Exemption

Document Description
The project changes existing groundwater and vadose zone monitoring program at the Clean Harbors Westmorland permitted hazardous waste disposal facility. Facility location and site maps are herein attached for reference.

Contact Information
Hassan (Al) Batakji
Department of Toxic Substances Control
Northern California Permitting & Corrective Action 8800 Cal Center Drive
Sacramento, CA 95826

Phone : (916) 255-3615



Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
Section 15301
Reasons for Exemption
These changes to the environmental monitoring program are not anticipated to pose a significant impact due to the long history of monitoring groundwater for contaminants which have been at background level or non-detectable. This change in environmental monitoring will not pose significant risk to human health or the environment because: 1. Discontinuing groundwater monitoring in the sixteen wells near WMU's 3, 5, 8, and 9 is a minor change considering that the area has been inactive with no hazardous waste disposal activity since 1995, and that an extensive groundwater monitoring network of wells throughout the site continue to be sampled and monitored. Also, quarterly groundwater monitoring was conducted from 1994 through 2004, which exceeds the 3 year regulatory requirement (CCR Title 22, section 66264.90(c)). 2. Over ten years of extensive characterization of groundwater from the former WMU's 3, 5, 8, and 9 (proposed LC-5) has been completed. This long history of monitoring groundwater provides strong evidence that the site has had no releases of contaminants from the former WMU's. 3. The change in groundwater sampling will still be consistent with the intent of state and federal regulations. These regulations consider less frequent monitoring of groundwater quality at facilities that have demonstrated over a long period of time that levels of groundwater contaminants are at background levels or non-detectable. 4. DTSC has determined, based upon an evaluation of past groundwater data, that semi-annual sampling frequency would provide acceptable assessment of groundwater quality. DTSC will continue to evaluate groundwater data at this site. Conditions of the Class II modification allow DTSC to increase the monitoring points and sampling frequency for an amount of time if there are changes from the expected results or there is a change in site conditions.

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 or via phone at (916) 445-0613.

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