SITE INVESTIGATION AND REMEDIATION AT A FORMER LOCATION OF A LEAKING UNDERGROUND FUEL STORAGE TANK Private Sector Client, San Francisco Bay Area; 1998-ongoing; $800,000 plus Manifold for soil vapor extraction from multiple extraction wells Previous removal of several underground storage tanks (UST) and subsequent soil and groundwater sampling had indicated that soil and groundwater were contaminated with petroleum hydrocarbons. R&M was retained to perform further investigation and to develop and implement appropriate remedial actions. To date, R&M has completed the following: Prepared and implemented work plans for various stages of soil and groundwater investigation and quarterly groundwater monitoring. Secured approval for no further action from the lead regulatory agency for four of the five former UST sites. Conducted a feasibility study (FS) and assessed applicability and cost-effectiveness of alternative remediation technologies for cleanup of the impacted soil and groundwater. The remedial action plan (RAP), for which approval was secured from the lead regulatory agency, specified the use of soil vapor extraction (SVE) for remediation of soil and in-situ bioremediation of groundwater via injection of a remediation mixture containing nitrate as an alternative electron acceptor and other nutrients into the saturated zone where significant petroleum hydrocarbon impacts exist. The RAP was later amended to include the use of insitu oxidation via ozone injection. Designed and installed a bioremediation system pilot test using three strategically located injection wells). Performed 4 rounds of nitrate injections and 12 rounds of ground monitoring to assess the progress of bioremediation. Installation of monitoring well for plume delineation Designed, installed, and operated a SVE pilot unit and developed criteria that were used to design a full-scale system, consisting of three specially constructed soil vapor extraction wells and a manifold system that allows the supplementary use of the injection and monitoring wells as vapor extraction wells. Secured all necessary permits and approvals from regulatory agencies and installed, and is now operating, a full-scale system. Initially, the system used an internal combustion engine that utilized a Dayton 4.3L six-cylinder GM motor, with exhaust treatment by two in-series standard automotive catalysts prior to venting to the atmosphere. Because of a significant drop in the hydrocarbons content of the extracted gas, the combustion system was subsequently replaced with two 1,000-lb granular activated carbon (GAC) canisters. Performance monitoring of the SVE system includes sampling and testing of the raw extracted gas, intermediate gas stream, and the final effluent that is discharged to the atmosphere. Designed, installed, and is currently operating a 6-well insitu ozone injection system that has brought about a drastic reduction in the concentration of petroleum hydrocarbons in groundwater. Has prepared and submitted numerous reports and documents relating to this project to various regulatory agencies.