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Ocampo Property September 2013 <br /> 821 South Wilson Way, Stockton <br /> Claim No: 18916 <br /> Monitoring Well Information <br /> Well Designation Date Installed Screen Interval Depth to Water <br /> (feet bgs) (feet bgs) <br /> (01/28/13) <br /> MW-1 February 2004 35-55 32.67 <br /> MW-2 February 2004 35-55 32.80 <br /> MW-3 February 2004 35-55 32.21 <br /> MW- Se tember 2009 35-55 31.89 <br /> MW-5 August 2008 35-55 32.40 <br /> MW-6 Auu st 2008 70-75 32.45 <br /> Remediation Summary <br /> • Free Product: None reported in GeoTracker. <br /> • Soil Excavation: Excavation was conducted to a total depth of 15 feet during tank removal in <br /> 1985. <br /> • In-Situ Soil/Groundwater Remediation: Soil vapor extraction was conducted between <br /> December 2010 and August 2011, which reportedly removed approximately 8,258 pounds of <br /> TPHg. A rebound test showed the soil vapor extraction system had reached asymptotic levels. <br /> Soil vapor extraction with air sparging has been proposed to reduce contaminant mass in the <br /> source area. <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 sample name [mg/kg( date sample name <br /> Benzene <0.005 06/26/08 VW-2-5 0.048 06/26/08 VW-2-10 <br /> Eth (benzene <0.005 06/26/08 VW-2-5 0.036 06/26/08 VW-2-10 <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 /> Most Recent Concentrations of Petroleum Constituents in Groundwater <br /> Sample Sample TPHg Benzene Toluene Ethyl- Xylenes MTBE TBA <br /> Date (Ng/L) (Ng/L) (Ng/L) Benzene (Ng/L) (Ng/L) (Ng/L) <br /> (jig/L) <br /> MW-1 01/28/13 <60 <0.5 <0.5 <0.5 <0.6 <1 <10 <br /> MW-2 01/28/13 <50 <0.5 <0.5 <0.5 <0.6 <1 <10 <br /> MW-3 01/28/13 <50 <0.5 <0.5 <0.5 <0.6 <1 <10 <br /> MW-4 01/28/13 <50 <0.5 <0.5 <0.5 <0.6 <1 <10 <br /> MW-5 01/28/13 210,0001 5,200 13,000 1,000 6,000 <0.5 <5 <br /> MW-6 01/28/13 100 <0.5 2.5 <0.5 <0.6 <1 <10 <br /> WQOs - 1 5 0.151 42 1 29 1 17 511,200' <br /> NA: Not Analyzed, Not Applicable or Data Not Available <br /> pg/L: Micrograms per liter, parts per billion <br /> <: Not detected at or above stated reporting limit <br /> TPHg: Total petroleum hydrocarbons as gasoline <br /> MTBE: Methyl tert-butyl ether,TBA: Tert-butyl alcohol <br /> WQOs: Water Quality Objectives, Regional Water Board Basin Plan <br /> a: California Department of Public Health, Response Level <br /> Page 7 of 10 <br />