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LFR Inc. • One 3 to 5 horsepower (HP) engine-driven pump; • Recirculation hosing and valves to allow routing of substrate and dilution water from the poly tank through the pump and back into the poly tank; • Hosing and valves to allow routing of the diluted substrate from the poly tank through the pump and on to the injection wells; and • Pressure gauges near the discharge end of the injection hoses. The selected edible oil substrate will be provided in a condensed, emulsified state by the vendor to eliminate the need for on-site mixing with emulsifiers and the equipment associated with the emulsification process. Dilution with water (at a ratio of 10 parts water to one part emulsified edible oil) will be performed on site. A 500- to 1,200- gallon poly tank will be used in conjunction with a 3 to 5 HP engine-driven pump to dilute the substrate. The same pump will be employed to deliver the diluted substrate to injection wells. Hoses connecting the pump with the injection wells will be fitted with pressure gauges near the wellhead to allow monitoring of injection well pressures during substrate injection. 4.3 ERD Periodic Monitoring Program This section provides a brief overview of monitoring and data evaluation procedures for monitoring the performance of the ERD program and the need for performing ERD in the B-zone aquifer. This program was developed using U.S. EPA protocols for evaluating MNA (e.g., U.S. EPA 1998) and ERD (e.g., ESTCP 2006). Monitoring of ERD performance generally includes groundwater sampling to evaluate the substrate distribution after injection, and to monitor the emulsified oil performance and geochemical changes. The overall goal of the monitoring program is to collect data to evaluate the effectiveness of the system and the need for ERD in the B zone. Primary groundwater parameters that will be sampled regularly for process monitoring include: • contaminants and daughter products, (e.g., VOCs, ethene and ethane) • biogeochemical indicators of redox conditions (e.g., DO, ORP, nitrate, sulfate, iron, etc.) • distribution of organic substrate and its by-product (as TOC and Total Inorganic Carbon [TIC], respectively) The analysis of samples for microbial bacteria is not included in the proposed monitoring plan because analysis for the proposed MNA parameters is expected to provide sufficient evidence of natural attenuation. These parameters provide basic information on the efficacy of substrate delivery to the treatment zone and the prevailing redox conditions. Contaminants of concern and their Page 24 wp-PhV_IRA-Sep07-Final-06750.doc:1fr