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# NPL Site Narrative for Pemaco Maywood

PEMACO MAYWOOD Maywood, California Federal Register Notice: January 19, 1999
Conditions at Proposal (July 28, 1998) : Pemaco Maywood is a four-acre facility that housed a chemical blending facility operated by Pemaco, Inc. between the late 1940s and 1991. Hazardous chemicals stored at the facility in underground and aboveground storage ta nks and drums included chlorinated and aromatic solvents, flammable liqu ids, petroleum hydrocarbons, and other volatile organic compounds. There were 31 underground storage tanks, six aboveground storage tanks, and more than 400 drums on site when the facility was investigated by the Los Angeles County Fire Department in 1992.
During the Expanded Site Inspection (ESI) conducte d in May 1997, several volatile organic compounds were identified in near-surface and deep soil sa mples, as well as perched ground water and an underlying regional aquifer. Floating product consisti ng of total petroleum hydrocarbons (gasoline) and 12 volatile organic compounds was recovered from three wells drawing from the perched ground water. Aqueous samples from 10 other wells in the perched ground water zone contained several chlorinated hydrocarbons such as tetrachloroethene (PCE), trichloroethene (TCE), 1,1,1-trichloroethane (TCA), 1,1- and 1,2-dichloroethenes, 1,1-dichloroethane, and vinyl chloride.

EPA installed four monitoring wells into the shallow regional aquifer (80 to 100 feet deep) during the ESI in May 1997. Ground water samp les from three of the four wells contained TCE ranging from 410 to 11,000 micrograms per liter. Although the monito ring wells penetrate a shallow regional aquifer of the Lakewood Formation, most of the drinking water we lls within four miles of the site draw water from the San Pedro Formation. Approximately 100 feet of clay separate the Lakewood from the San Pedro Formation within two miles of the site.

Thirteen water purveyors draw ground water from 78 wells within four miles of the site to supply drinking water to approximately 339,000 people. The ne arest well to the site is 0.3 mile downgradient. The site is located next to the Los Angeles River; however, the river is not used for drinking water. There are no fisheries nor sensitive environments a ssociated with the site. The site is in a mixed industrial and residential community, with a residential tract across the street.

The Pemaco facility was a large quantity hazardous waste generator when it was in operation. Regulatory involvement at the site has been limited to EPA, with some involvement from the Los Angeles County Fire Department and the City of Maywood.
Status (January 1999) : EPA is considering various alternatives for the site.

For more information about the hazardous substances identified in this narrative summary, including general information regarding the effects of exposure to these substances on human health, please see the Agency for Toxic Substances and Disease Re gistry (ATSDR) ToxFAQs. ATSDR ToxFAQs can be found on the Internet at http://www.atsdr.cdc.gov/toxfaq.html or by telephone at 1-888-42-ATSDR or 1-888-422-8737. 

## National Priorities List (NPL) Last u p dated on Wednesda y, November 11th

, 2009. htt p : //www.e p a. g ov / su p erfund / sites / n p l / nar1517.htm 

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