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Ms. Lori Duncan April 12, 2002 Page 8 Project 880-039.1A To evaluate the feasibility of air sparging a test will be conducted to determine several site-specific parameters necessary for successful remedial system design, including: • The injection pressure needed to maintain flow into the aquifer. • The relationship between injected airflow rate and pressure. • The injected air radius of influence in the aquifer and vadose zone. • The effects of the injected air on the aquifer and vadose zone (change in DO content and carbon dioxide (CO2) concentrations). • The change in hydrocarbon vapor concentrations at the observation points. The air sparge test will be performed on wells VW -2 and VW -3. Ambient air will be injected into the sparge wells using an oil -less compressor equipped with a pressure regulator, flow meter and pressure gauge. Helium from a pressurized helium vessel will be blended with the injection air to serve as a tracer gas. The combined injection flow rate and injection pressure will be monitored and recorded to develop a flow rate versus pressure relationship. The AS test will be performed in conjunction with operation of the SVE system. The SVE system will be used to capture the sparge injection flow and to verify the SVE radius of influence. Before and after the air sparging test, DO will be measured in the monitoring points and sparge wells, and oxygen, CO2, percent lower explosive limit (LEL), and parts per million petroleum (ppm) hydrocarbons will be measured in the head space of the monitoring points and sparge wells. Pressures at the observation points will be measured with magnehelic gauges. Pressures will be recorded at approximate 10 -minute intervals throughout the test. The injection flow rate, pressure, and temperature will be recorded as needed. A PID will be used to measure the vapor concentrations in the monitoring points and sparge wells. IT CORPORATION SAC:\\\SACRFP 1 \COMMON\sacDP\2002\PRJ\PJ8\880\8800391 A.2ac. doc (01040000)