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335 Railroad Ave – Grass Valley
In January 1991, a subsurface Investigation documented Total Petroleum Hydrocarbons as gasoline (TPHg), Total Petroleum Hydrocarbons as diesel (TPHd), Total Oil and Grease (TOG), the volatile aromatic compounds benzene, toluene, ethyl benzene, and (total) xylenes (BTEX), and metals (cadmium, chromium, lead, nickel and zinc) in soil samples. Soil analytical data indicated maximum concentrations of TPHg at 410 milligrams per kilogram (mg/Kg), TPHd at 39,000 mg/Kg, TOG at 45,000 mg/Kg, and total BTEX constituents at 65 mg/Kg.
Between 1993 and 1996 several soil borings were advanced and monitoring wells installed to determine the extent of subsurface contamination at the site. In May of 1996, two vapor extraction wells and three air sparge wells were installed. In November of 1996 a soil vapor extraction (SVE) pilot test was conducted, the results of which determined that SVE technology would be impractical at this site.
In June of 1997, dual-phase vapor extraction (DPE) pilot tests were conducted in at the two vapor extraction wells. Test data indicated that a radius of influence of 30 feet could be achieved from each well when applying a vacuum of 15 millimeters of mercury (mm-Hg). In addition, vapor flow rates of 55 cubic feet per minute (cfm) and 60 cfm could be generated in the extraction wells.
In order to prevent further water quality degradation and contaminant migration, E2C submitted an Interim Remediation Action Plan (IRAP), dated September 30, 2005, which proposed the use of high-vacuum groundwater extraction to remove petroleum hydrocarbon impacted groundwater from selected wells at the Site. After approval of the IRAP, high vacuum extraction (HVE) activities occurred from March 2006 to June 2009.
In 2012 the Tank Fund recommended that the Water Quality Board review the site for closure due to the low contaminant concentrations at the site, and the associated low risk to human health and the environment. In 2014 the State Water Board issued a Remedial Action Completion Certificate to E2C and their clients.