The Lorentz Barrel & Drum CERCLA site (LBD site), located in San Jose, California, is a former drum recycling facility that accepted over two million drums from 1947 until 1987, when the facility was closed. Drums arrived containing a variety of aqueous wastes, including solvents, acids, oxidizers, and oil; were cleaned using heat, caustics, acids, steam, and/or mechanical methods; and were repainted, resealed, and shipped offsite. Liquid waste and cleaning water were discharged to onsite sumps and basins; some of the material subsequently drained into site soils or into the storm sewer – contaminating soil and groundwater. A groundwater pump and treat (P&T) system is the major component of the groundwater remedy at the site. The groundwater P&T system consists of 18 groundwater extraction wells and a granular activated carbon treatment system.
PIONEER is responsible for the operation and maintenance of the groundwater P&T system, NPDES compliance/reporting, groundwater monitoring, report writing, and regulatory negotiation. PIONEER is currently in the process of conducting a focused feasibility study (FFS) in cooperation with the USEPA.
The purpose of the FFS is to perform a holistic evaluation of the performance of remedial actions that have been implemented at the site, and to develop and evaluate alternatives that can more efficiently and effectively achieve all cleanup goals within a reasonable restoration time frame. A number of technologies are being considered and will be thoroughly evaluated in the FFS in order to identify the remedial alternative that will be used to address constituents of concern (COCs) in (1) source-area soil and groundwater, and (2) downgradient groundwater.
A number of possible modifications to the existing groundwater P&T system are being evaluated in the FFS. Other remedial alternatives that may remediate VOCs in groundwater more efficiently than the existing P&T system (e.g., source-area treatment with enhanced in-situ bioremediation, institutional controls, and groundwater monitoring for downgradient groundwater impacts), and would not require extraction of impacted groundwater, treatment of extracted groundwater, or discharge of treated effluent, are also being evaluated.