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environmental Health investigations branch

Environmental Health Investigations Branch

Current Site Investigations


Orange County North Basin Superfund Site Investigation

SAS is investigating the Orange County North Basin area. The site is a comingled groundwater plume of contaminants covering more than five square miles. Multiple agencies are involved including the US Environmental Protection Agency, Orange County Water District, Santa Ana Regional Water Quality Control Board, and the cities of Fullerton, Placentia, and Anaheim.


Argonaut Mine Superfund Site Investigation

SAS is investigating the Argonaut Mine Superfund site in the city of Jackson, located in Amador County.


Superfund Site Investigations in South Gate, Los Angeles

SAS is investigating two Superfund sites in the city of South Gate, CA; Southern Avenue Industrial Area and Jervis B. Webb Co.


Modesto Dry Cleaner Investigation

SAS is investigating how releases of dry cleaner chemicals into the soil could affect indoor air of dry cleaner building and nearby homes. 


Riverside Agricultural Park

SAS is investigating the public health concerns associated with contamination at the Riverside Agricultural Park ("Ag Park").
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Contact Danny Kwon, Health Assessor, at the Site Assessment Section for additional information at (510) 620-3670 or by email at
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