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1 ' network or alignment to intercept migrating contaminant Details of the iSOC technology and system design are attached hereto as Appendix C Application of the Oxygen Infusion System ' Based on manufacturer recommendations, the system should operate at an oxygen flow rate of 15 cubic centimeters per minute (cc/min) and a pressure of 5 pounds per square inch (psi) above the maximum static water pressure Clearwater anticipates that up to 6 1SOC units may be ' warranted to achieve cleanup goals for the site At least five of the existing monitoring wells located within the contaminant plume may be used as infusion points Installation of additional wells will be recommended in order to provide an appropriate degree of "coverage" across ' and/or around the contaminant plume Clearwater anticipates that variable biodegradation rates within the contaminant plume will warrant periodic movement of individual 1SOC units between wells to assure that the system is adjusted as contaminant concentrations and distribution change ' The existing network of monitoring wells will continue to be monitored on a quarterly basis to evaluate remedial progress and to estimate the time needed to reach remedial target levels The ' monitoring well samples will be analyzed according to USEPA Method 8260B for concentrations of TPHg, BTEX and five-fuel oxygenates In order to evaluate biodegrading activity, selected wells will also be sampled for hydrocarbon-degrading and heterotrophic 'i bacteria, pH, dissolved oxygen, oxidation-reduction potential, ammonia nitrogen, ortho- phosphate, sulfate, nitrate, alkalinity, and ferrous iron ' Trenching details will be provided after the final well network is defined The system tubing may be laid directly into a 2 x 12-inch saw-cut path and sealed with concrete or a larger 6 x t2- inch trench may be dug from the wells to a remediation compound that will house the system equipment One-quarter inch flexible polyurethane tubing will be installed in the trenches and used to connect the infusion probes to the cylinders in the compound ' Conclusions ' Based on the findings of the biodegradation pilot study, Clearwater believes that the best remediation option for the site is enhanced bioremediation using oxygen infusion This technology has been successful at sites with contaminant profiles and soil conditions similar to ' those at the site Other benefits of the proposed technology are that it generates no wastes, requires no power or fuel, is simple and non-disruptive to install and maintain, and is substantially more cost-effective than other remedial options (i e , SVE, air sparging, ' groundwater extraction) Clearwater believes that the use of enhanced bioremediation using oxygen infusion will achieve cleanup goals for the site The following table provides a summary of the remedial alternatives, their anticipated effectiveness, and anticipated costs discussed ' herein ' ZB 178C Addendum to CAP 4 December 31,2003