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' 306620 Project Team March 28, 2007 ' Page 4 • MW-25D (screened 61 to 66 feet)– No change in air flow was observed at the compound when ' the valve to well MW-25D was opened to the sparge system. The pressure remained steady at approximately 40 psi at the compound. Due to piping configuration limitations, no pressure gauge was installed at the wellhead, but air was briefly heard rushing into the well when the ' valve was opened. After five seconds, no evidence of air entering the well (sound of air moving, vibration, temperature change of piping, etc.)was observed. The theoretical fracture pressure is estimated to be around 44-45 psi. Similar to well MW-23S, there may not be enough ' pressure to displace the water in the well casing. • MW-19S (screened 30 to 50 feet) –During the field tests, no pressure was observed at the well ' head, which indicated that well MW-19S is not connected to the sparge system. Additionally. ENSR personnel started the SVE system to verify that MW-19S is not connected to the SVE system. ' MW-19D (screened 61 to 66 feet)–Similar to MW-25D, no change in flow was observed at the compound when the valve to well MW-19D was opened. No pressure gauge was installed at the wellhead, but air was briefly heard rushing into the well when the valve was opened. After approximately five seconds, there was no evidence of air flow(sound of air moving, vibration, temperature change of piping, etc.) entering the well. As discussed above for MW-23S, not enough pressure for air injection and fracture breakthrough. An additional series of tests was conducted on March 23, 2007 to attempt to establish and measure flow rate at AS-33 and MW-23S. These sparge wells were selected because their screen interval represented the desired sparge depth for the upgrade to the air sparge system at the site. ENSR rented a trailer-mounted, diesel-powered compressor, capable of 110 CFM with an operating range of 80 to 125 psi. The compressor was equipped with a pressure regulator, and ENSR installed a rotameter on ' the outlet of the compressor. An air hose was connected directly to the wellhead of air sparge well AS-33—and later on monitoring/sparge well MW-23S—and the well was isolated from the air sparge system. ENSR personnel started the compressor and then increased the pressure to the well until ' breakthrough was observed and a stable flow rate was achieved. Observations from this test are shown in Table 3. t A Trusted Global Enmronmental,Health and Safety Partner ' Sparge Flax Rate Summary_Stockton_306620 Final.doc