Refinery, Southern California, Major Oil Company
AME professionals provided oversight consulting to the refinery environmental program manager including review of the ongoing NAPL recovery program and the ground water remediation system, including fluidized bed GAC treatment of a dissolved hydrocarbon plume. We reviewed previously completed dual-phase pilot testing for NAPL recovery and participated in design and data collection for additional dual-phase pilot testing. We provided oversight of the development of a ground water model. We participated in the development of a water quality monitoring program and development of scopes of work for subsequent abandonment of large diameter ground water production wells. We developed a Master Work Plan to describe future tank and pipeline upgrades, remedial system improvements and further model development for submittal to the RWQCB. We developed feasibility options for enhanced remediation of a dissolved phase plume and on-site NAPL recovery enhancement.
Technical support was provided regarding LNAPL characterization and recovery analysis, dissolved transport related to potential off-site migration, and characterization of dissolved and sorbed hexavalent chromium. The results of the LNAPL analysis determined that non-representative well thickness measurements were producing erroneous perspectives on LNAPL volumes and distributions. The off-site impact analysis indicated that ground water was not migrating off the refinery. A presentation was made to the regulatory agency (USEPA) and the issue was resolved. Visual imagery analysis was conducted to illustrate the distribution of hexavalent chromium in soil and ground water in an area of concern within the refinery. This analysis documented the chromium impacts are limited and do not affect the underlying aquifer.
Refinery Marketing Terminal, Bay Area, California, Major Oil Company
Approximately 300 borings were advanced to allow for pressure injection of Oxygen Release Compound (ORC*) to reduce the concentration of petroleum hydrocarbons in the subsurface. The ORC* releases oxygen when it comes into contact with soil moisture or ground water in the direct push borings, thereby enhancing natural biodegradtion of petroleum hydrocarbons by providing or replenishing the oxygen required for the process to occur. The ORC* is mixed with water to form a slurry which is delivered under pressure in the direct push boring.
Refinery, Ferndale, Washington, Major Oil Company
Regulatory files were reviewed for the history of spills, releases, and remedial actions at the refinery in Ferndale, Washington. Subsequent to a series of sales and mergers, the refinery is now owned and operated by another party. The files reviewed document at least 16 spills or releases at the site subsequent to the sale by Mobil in 1988. A summary report on the history of spills, releases, and remedial actions was completed.
Former Refinery, Cut Bank, Montana, Major Oil Company
We recently began work at this site and have conducted file review for transition as well as semi-annual ground water monitoring. Future site activities will include investigation for lead in soil potentially followed by a removal action for lead impacted soil based on regulatory negotiations. Additional investigation of petroleum hydrocarbons in surface soils in a drainage area to the southwest of the site and a potential removal action for this area if impacted may be required based on regulatory negotiations. Investigation of deeper ground water (to 200 feet below ground surface) may also be required.