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with the installation of wells, purchase of treatment equipment, and <br /> operation and maintenance of a treatment system ORC injection at <br />' numerous locations downgradient of each former tank location was <br /> deternuned to be the most effective technology because flus allowed for <br /> the greatest volume of ground water to be treated at the lowest cost <br />' As discussed in Appendix C, the biodegradation capacity of site <br /> �' ca p ty <br /> conditions is adequate to address the low levels of TPH and BTEX <br />' constituents currently present in ground water, with or without the <br /> continued addition of ORC Therefore, although background conditions <br /> have not been achieved at this time, naturally occurring biodegradation <br /> activities will continue to occur at the sites, further decreasing the <br /> concentrations of TPH and related constituents Further ORC addition or <br /> tother remedial activities are unnecessary <br /> 1 <br />' ERM 17 HEINZ USA 3374 60-3/27/00 <br />