Active (Former BP) Station, 11079 Folsom Boulevard, Rancho Cordova

Petroleum hydrocarbon impact to the subsurface was discovered at this site in the late 1990s. During an initial phase of investigation, groundwater was found to be present at approximately 65 feet bgs and a monitoring well network was installed. High concentrations of contaminants were encountered during subsequent well sampling (GRO, benzene, and MTBE at levels as high as 14,000,000 µg/L, 12,000 µg/L, and 9,400 µg/L, respectively). After becoming involved with the project in 2000, Stratus expanded the monitoring well network in order to constrain the extent of the petroleum hydrocarbon plume. After completing this task, remediation pilot testing was used to evaluate an approach to mitigate site contaminants.

After reviewing the results of the pilot testing, SVE and GWE were selected as remedial alternatives for the subject property. The GWE&T system was primarily installed in order to provide hydraulic control of a migrating plume of dissolved contaminants within the subsurface. The SVE system was used to mitigate residual fuel contamination in the unsaturated zone above 65 feet bgs, and within any soil strata exposed by local drawdown of the water table by groundwater pumping.

Operation of the remedial system resulted in a rapid cleanup of the subsurface contaminants. In approximately 2 years (February 2004 to February 2006), the SVE system extracted and abated an estimated mass of approximately 18,800 pounds of petroleum hydrocarbons from the subsurface. Based on post-remediation groundwater sampling results, a substantial percentage of the dissolved petroleum hydrocarbon mass appears to have been mitigated.

GRO Impact to Groundwater, June 2002

GRO and MTBE Impact to Groundwater, December 2006