Projects

 

SFP-B Limited Partnership is the current owner and operator of the former Montgomery Ward facility located in Sacramento, California. Previous owners of the facility were issued a Cleanup and Abatement Order in 1989. Findings of the Order identified contaminants in onsite monitoring wells as a potential source for contamination observed in a municipal well located approximately 750 feet from the site. Numerous site investigations have been conducted by various large-scale consultants since 1989. In all, the site consists of approximatly  1.5 acres and contains over 30 wells installed to a maximum depth of 115 feet below the ground surface. Initial investigations showed TRHG in soil at maximum concentrations of 220,000 mg/kg and groundwater  concentrations well over the saturation limits. At least five monitoring wells contained free product at a maximum thickness of approxiamelty 1.5 feet. Remedial activities have been conducted at the site since 1993 using groundwater extraction and treatment and soil vapor extraction. An air sparging system was added in 1998. In 2000 TPHG and benzene levels were at or near the detection limits. Based on these levels, the previous consultant prepared a Request for No Further Action. Once the systems were turnes off, however, groundwater concentrations expereinced significant rebound.

 

Based on lack of performance by the previous consultants, VESTRA was retained by SFP-B in 2005 to condut an evaluation of remedial systems being used at the site, bring the site into compliance with current UST regulations, and develop a corrective action plan for future remedial activities. In response, VESTRA developed work activities necessary to define the constituents , magnitude, and extent of soil and groundwater contamination at the site. The evaluation concluded the system was eliminating approxiamtely 2 pounds of petroleum hydrocarbons per day at nearly $6,000 per month in system operating costs. Because the last comprehensive soils investigation was conducted in 1993 , it was clear that in order to develop an effective remedial action plan to address residual contamination , a new soils investigation was needed to identify remaining contaminant areas. This need was further exemplified by water levels in the area having risen nearly 30 feet since the municipal well was abandoned, altering subsurface conditions, which likely mobilized contaminants in the vadose sone and submerged most of the well screens.