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ORC TECHNICAL BULLETIN # I.2b <br /> Oxygen Release Compound,ORC® <br /> Early Commercial Use <br /> in Single Wells <br /> Alaska Study with Hart Crowser <br /> An ORC pilot well study was conducted by Hart Crowser in Homer, Alaska. The site <br /> was a utility company property that had experienced significant hydrocarbon releases <br /> and the dissolved phase was present in a shallow water table characterized by a coarse <br /> gravel This gave the site a very high flow characteristic on the order of 20 feet/day <br /> The longevity of ORC is tied to ground water velocity so this was an extreme test. <br /> Attempts to use air sparging, in a side-by-side pilot test, faded because the sparge points <br /> fouled in the high iron environment and showed evidence of channeling - a common <br /> problem with a forced air technology The study demonstrated a significant increase in <br /> dissolved oxygen levels at an array of downgradient monitoring points. <br /> The results of the pilot study are as follows Wells WP-2 through WP-4 are 2 feet on <br /> center(from left to right) at 5 feet from the ORC source well Wells WP-5 through WP- <br /> 7 are 3 feet on center (from left to right) at 10 feet from the ORC source well. Oxygen _ <br /> distribution, even after consumption by BTEX remediation, was impressive enough to <br /> warrant the purchase and installation of a full Oxygen Barrier A discussion of the <br /> results of this and the other full barrier installations are found in the I.2 Series of the <br /> Technical Bulletins <br /> Average Oxygen Concentration in ppm <br /> Before ORC 1 Month 2 Months 3 Months <br /> Background 02 02 0.2 0.4 <br /> WP-2 02 14 25 3.0 <br /> WP-3 04 09 5.6 2.7 <br /> WP-4 02 1 8 59 3.0 <br /> WP-5 02 1.3 36 3.9 <br /> WP-6 06 02 0.8 1.1 <br /> WP-7 02 02 08 10 <br />