pemaco maywood


Pemaco is a former chemical mixing facility located in a light industrial and residential area at 5050 Slauson Boulevard, Maywood, CA. It is believed that Pemaco began on-site operations in the late 1940's. Pemaco was purchased by the LUX Chemical Company on July 27, 1988, and operations ended at the site on June 21, 1991. Hazardous substances are known to have been used at the facility, including chlorinated solvents, aromatic solvents, and flammable liquids. Shortly after the closure of the facility, the Los Angeles County Hazardous Materials (Hazmat) Unit ordered the potentially responsible party to remove containers and drums of laboratory chemicals located in the warehouse and outside staging area. However in December 1993, the facility burned to the ground. Although the fire completely destroyed the warehouse, six 55-gallon drums, several above-ground storage tanks, and thirty-one underground storage tanks were unaffected by the fire. Due to safety concerns after the fire, the Environmental Protection Agency (EPA) was asked to conduct an emergency assessment and stabilize the site. The Agency responded by doing the following: 1) erecting a chain link fence with razor wire around the site; 2) verifying that all storage tanks were empty; 3) attaching locking caps to standpipes; and 4) removing a small number of 55-gallon drums for disposal. Having completed site stabilization activities, EPA referred the site back to the LA County Hazmat and informed the EPA Site Assessment program about the site for further study. After further studies to define the nature and extent of contamination, and initiation of cleanup activities, the site was placed on the NPL on January 19, 1999. The Record of Decision for the Pemaco site was signed on January 13, 2005. Construction of the final remedy began during 2005. EPA completed construction of the remedy that was included in the Maywood Riverfront Park by June 2006. Construction of the treatment plant and placement of the equipment into the treatment plant continued until early 2007. EPA turned on the groundwater treatment system during April 2007. The vapor recovery and treatment system was turned on during May 2007, and the Electrical Resistance Heating remedy for the source area of the site began full operations during September 2007. EPA turned off the Electrical Resistive Heating remedy during April 2008 and permanently transferred vapor treatment over to carbon during June 2008. The concentrations in the ERH area, vapor treatment system and groundwater continue to decrease over time.

Hazardous Ranking Score

45 / 100

A score of 28.5 or higher qualifies a site for the Superfund National Priority List.

Regional Contact

Region 9
Phone: (415) 947-4251

Contact Region



Site Inspection
Preliminary Assessment
Final Listing On NPL

Contaminants & Health Effects

      Endocrine Disrupter
      Reproductive Toxin
      Persistent, bioaccumulative and toxic


        African American
        American Indian and Alaska Native
        Native Hawaiian


        People living
        within a 1 mile radius


        Average Income


        Occupied homes

        Potentially Responsible Parties

        Similar Sites

        Add Story


        No stories have been submitted for this site.