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Super Center Mart January 2014 <br /> 701 East Charter Way, Stockton <br /> Claim No: 12741 <br /> Monitoring Well Information _ <br /> Well Designation Date Installed Screen Interval Depth to Water <br /> (feet bgs) (feet bgs) <br /> 04/15/13 <br /> MW-1 December 1998 14-54 Inactive <br /> MW-2 December 1998 28-48 28,29* <br /> MW-3 December 1998 28-48 Inactive— <br /> MW-4 Se tem_ber 2006 28-48 29.39* <br /> MW-5 September 2006 _ 28-48 27.68* <br /> MW-6 September 2006 28-48 27.92* <br /> MW-7 Aril 2004 28-48 28.90* <br /> MW-8a Aril 20_04 28-48 Inactive <br /> MW-8b A ri12004 80-86 Inactive <br /> MW-8c A ri12004 109-123 Inactive <br /> MW-8d A ril20_04 140-150 Inactive <br /> MW-9a Aril 2004 28-48 Inactive <br /> MW-9b Aril 2004 80-86 Inactive <br /> MW-9c Aril 2004 109-119 Inactive <br /> MW-9d A ri12004 140-150 Inactive <br /> MW-11 June 2009 28-48 26 87 <br /> NM: Not measured <br /> *measured 11/28/12 <br /> Remediation Summary <br /> • Free Product: No free product reported in GeoTracker. <br /> • Soil Excavation: An unknown volume of impacted soil was excavated, disposed offsite, and <br /> replaced with clean fill in 1998 <br /> • In-Situ Soil/Groundwater Remediation: Dual phase extraction was conducted between January <br /> 2011 and present for a total of 7,518 hours, which has extracted 199,330 gallons of <br /> groundwater and 5224 pounds of TPHg. The rate of TPHg removal in December 2012 was <br /> approximately 7 pounds per day. <br /> Most Recent Concentrations of Petroleum Constituents in Soil <br /> Constituent Maximum 0-5 feet bgs Maximum 5-10 feet bgs <br /> [mg/kg date) [m /k <br /> Benzene _ <0.6 03/20/98 <0.005 <br /> Eth (benzene _ 40 03/20/98 <0.005 <br /> Naphthalene _ NA NA <br /> PAHs INA NA <br /> NA: Not Analyzed, Not Applicable or Data Not Available <br /> mg/kg: Milligrams per kilogram, parts per million <br /> <: Not detected at or above stated reporting limit <br /> PAHs: Polycyclic aromatic hydrocarbons <br /> Page 8 of 13 <br />