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ORC TECHNICAL BULLETIN # 1.2c <br /> Oxygen Release Compound,ORC <br /> New Mexico Field Results <br /> A pilot study was conducted during the months of August through December 1994 <br /> at the Shell North Main Site in Belen, New Mexico using an ORC® barrier The site <br /> is a State Lead Site and both the pilot study and the subsequent barrier installation <br /> were sponsored by the Underground Storage Tank Bureau of the New Mexico <br /> Environment Department. <br /> The purpose of the pilot study was to determine the feasibility of using ORC® to <br /> increase the levels of dissolved oxygen (DO) and to remediate a dissolved phase <br /> petroleum hydrocarbon plume The pilot study consisted of the installation and <br /> sampling of one 6-inch PVC source well (S-11), 26 downgradient monitoring points, <br /> and several existing monitoring wells. The pilot system was monitored to determine <br /> changes in DO and BTEX concentrations. The results of the pilot study showed that <br /> oxygen was released into the aquifer as verified by substantial increases in the DO <br /> concentrations away from the source well, and that remediation occurred at various <br /> points in the system as indicated by a decrease in the BTEX concentrations _ <br /> As a result of the pilot study, a full scale remediation system using ORC® was <br /> installed The full scale remediation system consists of twenty 6-inch ORC® source <br /> wells and 54 monitoring points downgradient of the source wells The vertical <br /> distribution of DO and BTEX was measured with probes located 3, 10, and 17 feet <br /> below the water table A total of 342 ORC® socks were installed on April 3, 1995 <br /> The system was monitored to determine changes in DO and BTEX <br /> The data was analyzed to determine the net effect of adding dissolved oxygen, as <br /> generated by ORC, on the hydrocarbon plume Technical Bulletin IV 3a presents <br /> the details of oxygen barrier formation generated by this data set and also provides <br /> the site maps relevant to this discussion This Technical Bulletin focuses on the total <br /> mass ("mass curves") of oxygen and BTEX over 93 days (Figure 1) and examines the <br /> fate of the BTEX plume as expressed in concentration contour diagrams over the <br /> same time period (Figure 2) <br /> Mass curves are generated by first contouring the areal and vertical distribution of <br /> oxygen and BTEX with interpolative techniques such as Kriging From this, the <br /> masses can be averaged in each area bounded by a set of contours and then summed <br />