Project Highlights:

• Federal Superfund Site
• Design review, construction oversight, and commissioning of a $30,000,000 treatment facility
• Review of remedial treatment operations at the facility
• groundwater impacted by pesticides, volatile organic compounds (VOCs), perchlorate, cadmium, nickel, chromium, and zinc
• 78 groundwater extraction wells and 350 groundwater monitoring wells
• Lime precipitation treatment for removal of the heavy metals
• Air stripping and liquid/vapor-phase granular activated carbon treatment for the removal of VOCs
• Community wellhead treatment of two wells for VOCs and perchlorate
• Ion exchange (perchlorate specific, anionic resin) treatment for removal of the perchlorate
• SCADA and remote monitoring of treatment and groundwater extraction facilities

A Hazardous Waste Site accepted industrial wastes from 1956 to 1972. During that period, up to 20 unlined surface impoundments for liquid wastes were located in the 17-acre disposal area.  It has been estimated that approximately 34 million gallons of liquid wastes containing spent acids, solvents, pesticide manufacturing byproducts, heavy metals (e.g., cadmium, chromium, zinc, nickel) and various organic and inorganic compounds were dumped or discharged into the unlined surface impoundments during the operational period.

EEC Environmental (EEC) has been retained as the process engineer for the Superfund Site and works directly with the California Department of Toxic Substances Control (DTSC) concerning the operation and upgrade of the existing groundwater treatment facilities.  groundwater at the site is being extracted from 78 on- and off-site wells (including two production wells using wellhead treatment). A total of three groundwater treatment systems are currently in operation, treating approximately 180,000 gallons of contaminated groundwater per day.

EEC responsibilities included the design review, construction oversight, and commissioning of the $30,000,000 treatment facility that initiated operations in 2017.  Key process equipment utilized in the treatment facility includes:  air strippers, liquid and vapor phase granular activated carbon treatment, lime, anti-foam, and polymer delivery systems, tempered water delivery system, filter presses, reaction vessels, inclined plate clarifiers (IPCs), clarifiers, air compressors and dryers, and pumps (centrifugal, progressive cavity, peristaltic).