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bona <br /> 2,090 µg/L, and 8,590 µg/L, respectively. Further information is available in IT Corporation's <br /> July 29, 1999, Underground Storage Tank Removal and Over-excavation Report. <br /> October 2009 Pilot Sparge Test by Stantec Consulting Corporation <br /> On October 6, 2009, Stantec injected approximately 26.8 pounds of oxygen into each remediation well <br /> and recorded depth to water, induced vacuum, and vapor concentration measurements in other site wells <br /> to determine an approximate radius of influence associated with the injections. The pilot sparge test <br /> demonstrated strong lateral and vertical communication between the B and B'Zones when injecting into <br /> the B Zone. Further information of well installations and the pilot sparge test are available in Stantec's <br /> November 10, 2009, Remedial Well Installation and Sparge Test Report. <br /> March 2010 through June 2012 Oxygen Sparging Events by Stantec <br /> From March 2010 through June 2012, Stantec conducted bi-weekly oxygen injection events in wells OS- <br /> 23 through OS-28. Approximately 13.4 pounds of oxygen was injected into each well and dissolved <br /> oxygen, depth to water, induced pressure, and vapor concentration measurements were recorded. At the <br /> completion of bi-weekly injection events, approximately 59 pounds of TPHg had been destroyed. Further <br /> information of site activities is available in Stantec's Semi-annual Summary Reports. <br /> GHD I Well Installation Work Plan Addendum I Attachment B 111193145(05)1 Page 6 <br />