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Task 3 - Groundwater Monitoring Monthly monitoring of DO, redox, pH, electrical conductivity, temperature, and groundwater elevations are proposed for all four wells. The monthly readings will be conducted for a period of three months following placement of the ORCO. At the conclusion of the third month, a second groundwater sample will be collected from well MW-2 and analyzed for the following parameters to evaluate ongoing indigenous conditions: Heterotrophic Plate Count Phosphate Ammonia Nitrogen Chemical Oxygen Demand Biological Oxygen Demand Additionally, quarterly groundwater monitoring and sampling will be conducted for the three perimeter monitoring wells at this time. The ORCO is anticipated to last from three to six months. At the end of the third month, the potency of the ORCO will be evaluated and, if found to be sufficient, a second three-month monitoring episode will be conducted. Task 4 - ORCO Evaluation Upon depletion of the ORCO, the sock will be removed and the wells will be allowed to stabilize. Upon stabilization, a minimum of two complete auart� sampling and monitoring episodes will be conducted. At least one of the sampling episodes will include analysis for petroleum oxygenates. Results of the quarterly sampling, along with the monthly data measured during the ORCO placement, will be used to evaluate the effectiveness of ORCO at the site. If found to be effective, then the degree of biodegradation will be evaluated and a decision made as to whether additional ORCO should be installed. If warranted, a second application and/or a more aggressive approach to the ORCO placement will be proposed. Task 5 - Mass Balance Calculation Per your request, as part of the ORCO evaluation, a mass balance calculation will be performed. The mass balance calculation will assess, as best possible, the approximate quantity of contaminants removed and/or remediated relative to the approximate quantity initially released to the environment. Task 6 - Brief Summary Report A brief report will be prepared summarizing the results of the ORCO placement and the evaluation conclusions. Included in the report will be recommendations for additional ORCO placement, if warranted. The report will also present the mass balance quantities calculated from Task 5. JJW GEOSCIENCES Inc.