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highest groundwater concentration of TPHg (9,700 ug/L) was detected in MW-5B MTBE was not detected by EPA method 8260 in any of the groundwater saimples analyzed 2000-2003 Beginning in June 2000 groundwater in all monitoring well's has been sampled on a calendar quarterly basis These sampling events took place on June 6, 2000, August 28, 2000, November 14, 2000, February 13, 2001, May 30, 2001, August 22, 2001, October 11, 2001, February 14, 2002, May 10, 2002, September 30, 2002, December 4, 2002, March 5, 2003, and June 5, 2003 Reports documenting these activities have been l previously submitted to'the SJC/EHD by Clearwater 2002 A dual-phase test well and air sparge point was installed at the site in February 2002 • Remedial feasibility testing at the site was conducted during the week of March 10, 2002 _ - T The Wil -Ii - alla__h_o_n and Feasibility Testing Report=was_su6mitted___ May 9,_2002 From data collected dunng- these activities, Clearwater 'developed-and submitted a, Corrective Action Plan dated November 20, 2002 to the SJC/EHD 2004 During the third quarter of 2004, twelve remediation infection wells and an oxygen- infusion system ("iSOC") were installed on the site The iSOC system has increased DO in the -remediation wells from `,`baseline" levels of approximately 1 mg/L to concentrations on the order of 30 mg/L Clearwater conducted monitoring of the 1SOC system, and collection of DO, ORP, total and ferrous iron, pH, temperature, and specific conductivity measurements on a bi-weekly basis Clearwater performed system monitoring on a monthly basis and followed with ,a regular quarterly groundwater monitoring schedule