SCH Number 2010041092

Project Info

Title

Bioaugmentation of Volatile Organic Compounds (VOC) in Groundwater at Former NASA Industrial Plant

Description

Under the oversight of this Regional Board, International Rish Assessment-Downey, LLC (IRAD, Discharger) has been conducting the investigation, remediation and monitoring of soil and groundwater contamination at the subject site. IRAD, through its environmental contractor ARCADIS, has been operating a side-wide in situ reactive zone (IRZ) system since November 2005 to remediate the VOC-impacted groundwater. The IRZ system promotes enhanced reductive dechlorination (RED) of chlorinated solvents by biostimulation of the native microbial community. This groundwater remediation process is currently carried out through injecting carbohydrate solution quarterly into the VOC-impacted groundwater under Waste Discharge Requirements (WDR), Order No. R4-2002-0030, CI No. 8724, issued by this Regional Board to IRAD. Although the current IRZ system has significantly reduced TCE concentrations in the center of the plume, performance monitoring data indicate that complete reductive dechlorination is not occuring efficiently in the vicinity of Line 1000 becuase of the presence of cis-1,2-DCE and vinyl chloride, and lack of significant ethane production. To further enahnce late-stage dechlorination in the Line 100, IRAD proposes to use bioaugmentation with selected bacteria cultures SDC-9TM or KB-1TM in addition to the current IRZ system, and submitted a report of waste discharge and an initial study for the proposed remediation activities.

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