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Last Edited: 5/18/2010

Hookston Station, Pleasant Hill - Public Health Activities

In 2005, the California Department of Public Health--formerly California Department of Health Services (CDHS)--assisted the San Francisco Bay Regional Water Quality Control Board by reviewing and eventually approving the 2006 Baseline Risk Assessment for the Hookston Station site.

The site

The Hookston Station site is located in Pleasant Hill, Contra Costa County. The approximately 8-acre site is currently occupied by mixed commercial and light industrial businesses. A high-density housing complex is present immediately across the northeast edge of the property. The site was owned and operated by Southern Pacific Transportation Company from June 1891 until September 1983. Between approximately 1965 and 1983, the land was developed into a mixed light industrial business complex. A former tenant at the site used trichloroethylene (TCE). The current responsible party is Union Pacific Railroad.

CDHS's involvement at the site

Investigations conducted between 1989 and 1996 discovered the presence of both petroleum-based products and chlorinated solvents in soil and groundwater at the site. Several recent studies have included a soil vapor study, soil and groundwater sampling, and a human health risk assessment. The exposure of greatest concern at this site is indoor air exposure of residents to TCE.

In 2005, CDHS staff sent the following letters to the Regional Water Quality Control Board regarding the development of the risk assessment:

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