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California Stop September 2013 <br /> 2224 Manthey Road, Stockton <br /> Claim No: 18428 <br /> M nitoring Well Information _ <br /> Well Date Installed Screen Interval Depth to Water <br /> Designation (feet bgs) (feet bgs) <br /> (05/01/2013) <br /> MW-1 Au ust 2005_ _ 10-30 17.11 <br /> MW-2 August 2005 10-30 16.55 <br /> MW-3 August 2005_ 10-30 16.44 <br /> MW-4 August 2007_ 70-80 17.67 <br /> MW-5 August 2007 10-30 17.49 <br /> MW-6 Au ust 2007 10-30 17.72 <br /> MW-7 August 2007 10-30 17.38 <br /> MW-8 August 2007 10-30 16.97 <br /> MW-9 October 2011 9-29 16.92 <br /> MW-10 November 2011 10-30 18.06 <br /> MW-11 November 2011 70-80 17.13 <br /> Remediation Summary <br /> • Free Product: None reported. <br /> • Soil Excavation: None reported. <br /> • In-Situ Soil Remediation: Soil vapor extraction pilot test was conducted for 8 hours in <br /> March 2012, which removed approximately 1.2 pounds of TPHg at a rate of 3.6 pounds of <br /> TPHg per day. <br /> • Groundwater Remediation: None reported, although a 6-month ozone pilot study is planned at <br /> the Site. <br /> Most Recent Concentrations of Petroleum Constituents in Soil <br /> Constituent Maximum 0-5 feet bgs Maximum 5-10 feet bgs <br /> m /k date [mg/kg date <br /> Benzene ___ 17 01/10/2002 <0.005 08/12/2005 <br /> Eth (benzene 230 01/10/2002 <0.005 08/12/2005 <br /> Naphthalene NA NA <br /> PAHs _ NA 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 /> Paqe 8 of 13 <br />