United States Nuclear Regulatory Commission - Protecting People and the Environment

Magnesium Alloy Products (State of California)

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1.0 Site Identification

Type of Site: Complex Decommissioning Site
Location: Compton, CA
License No.: Former AEC Source Material License STB-124/C-3632
Docket No.:
License Status: Unknown

2.0 Site Status Summary

Location was used for combining magnesium and thorium to manufacturer aircraft and missile parts. License was issued in December 20, 1956 for 5600 lbs of thorium not to exceed 4% by weight for manufacturing. The company is still owned by the original licensee.

The site was cited by an AEC inspector for illegally burying residual thorium within 3 inches of the surface-requirements at the time require on-site burial greater than 4 feet below the surface. License expired February 29, 1964.

A site visit was performed by CA Department of Health Services staff to determine the current status of the facility as part of the Formerly Licensed Sites on February 20, 2002 and elevated measurements using a sodium iodide detector was identified in the soil. The maximum soil contact measurement was 160 uR/hr.

Characterization plan sent to Los Angeles County of Feb 6, 2006 for approval. The plan was approved by Los Angeles County on Jul 16, 2007 by LA County. Clean up criteria for Th-232 was approved using site specific parameters.

The site has undergone limited remediation, however, CDPH visited the site on February 28, 2008 to perform confirmatory surveys and additional contaminated areas were identified. The maximum value obtained during the survey was 70k cpm on contact with the soil using a 2" by 2" NaI detector.

Contractor is performing additional characterization of the site to support additional remediation activities.

3.0 Major Technical or Regulatory Issues

Page Last Reviewed/Updated Thursday, February 20, 2014