This site formerly operated as a fuel storage facility for Shell Oil Company, and is currently operating as Springville Safety and Supply. It is located in close proximity to the Eel River, Fortuna Union Elementary School, and a residence. Five above ground storage tanks (ASTs) and two underground tanks (USTs) were removed from the area.
LACO was retained in 1993 to begin investigating the impacts to soil and groundwater at the site, and between 2000 and 2002, a total of 3260 cubic yards of petroleum hydrocarbon-impacted soil were excavated and transported to a licensed disposal facility. Constituents of concern (COCs) at the site include total petroleum hydrocarbons as gasoline (TPHg) and diesel (TPHd), benzene, toluene, ethylbenzene, and total xylenes (BTEX), and these COCs impacted groundwater across three levels of aquifers below the site.
In 2004 LACO installed an in-situ chemical oxidation (ISCO) remediation system to address remaining COC impacts under a Pay-for-Performance contract. This system reduced concentrations of all COCs from baseline to active remedial target values by 85%over a period of two years by injecting ozone into the three aquifers to enhance the chemical breakdown and biodegradation of petroleum hydrocarbons. LACO recommended this system as a cost effective alternative to further excavations at the site, and to protect the surrounding sensitive receptors from exposure to the COCs.
