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Last Edited: 11/23/2010

Conoco Service Station, Sacramento, Sacramento County - Public Health Activities

In 1996, the California Department of Public Health--formerly California Department of Health Services (CDHS)--responded to a community member’s health concerns related to potential exposure to emissions from soil and groundwater treatment systems.

The Site

The Conoco site, formerly the location of two adjoining gasoline service stations, is located adjacent to a residential neighborhood in Sacramento. Contamination of soil and groundwater was first discovered in 1985. Remediation of groundwater and soil was initiated in 1988 and 1991, respectively. 

CDHS’s Involvement at the Site
Under a cooperative agreement with the Agency for Toxic Substances and Disease Registry (ATSDR), CDHS prepared two health consultations in response to health concerns related to emissions from a thermal oxidizer and an air stripper used to treat soil and groundwater contamination.
In the first health consultation, CDHS reviewed the risk assessment created by Conoco as a part of the permitting process for the groundwater and soil treatment systems. Exposure point concentrations used in the risk assessment were derived from a screening level air model. This type of model can not account for the complex geography, fugitive emissions, proximity of residences, and multiple emission sources present in this situation. CDHS concluded that the treatment systems should not have been permitted based on this model. 

Health Consultation - [4/97]

In the second health consultation, CDHS evaluated laboratory analysis of a composite paper sample collected from personal property, believed by the community member to contain residual contaminants from emissions at the site. The composite paper sample had been analyzed for dioxins. CDHS staff concluded that the levels of dioxins measured in the sample were consistent with levels typically found in the environment (soil) and in paper products.

Health Consultation - [11/99]

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