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Chevron #9-0557 June 2013 <br /> 139 Center Street South, Stockton <br /> Claim No: 5820 <br /> Saturated Zones(s) Studied: Approximately 20 -60 feet bgs in the first saturated zone, and <br /> 100-- 105 feet bgs in the second saturated zone. <br /> • Appropriate Screen Interval: Well screens submerged. <br /> • GrOUndwater Flow Direction: South by southeast with an average gradient of 0.001 feet/foot <br /> (August 2012). <br /> M nitoring Well Information <br /> Well Designation Date Installed Screen Interval Depth to Water <br /> (feet bgs) (feet bgs) <br /> 08/10/2012 <br /> MW-3 02/15/91 35-60 20.31 <br /> MW-5 11/4/92 35-60 20.88 <br /> MW-6 09/14/93 35-60 20.23 <br /> MW-7 11/30/95 32-52 19.78 <br /> MW-3 10/06/97 22-42 20.00 <br /> MW-13 06/18/02 19-34 19.84 <br /> MW-14 03/31/04 20-30 20.18 <br /> MW-15 04/01/01 20-30 19.90 <br /> MW-15d 04/01/04 46-51 20.17 <br /> MW-16 03/31/04 20-30 19.62 <br /> MW-17 03/31/04 20-30 20.09 <br /> MW-18d2 11/27/07 1 100405 20.32 <br /> PJM: Not measured <br /> Remediation Summary <br /> • FreE! Product: Up to 0.15 feet noted in MW-9, none reported since October 2002. <br /> • Soil Excavation: Approximately 350 cubic yards of impacted soil were excavated in 2003 <br /> during tank removal and disposed offsite. <br /> • In-Situ Soil/Groundwater Remediation: Dual phase extraction pilot test was performed for four <br /> days in 2003, and 22 pounds of TPHg were removed. Approximately 15 pounds of ozone were <br /> sparged in a pilot test; determined not to be feasible. <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 [mg/kg( date <br /> Benzene NA 0.0006 12/14/10 <br /> Eth lbenzene NA <0.001 12/14/10 <br /> Na nthalene _ NA NA <br /> PAHs NA NA <br /> SVA: 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 /> 'AHs: Polycyclic aromatic hydrocarbons <br /> 'Removed by excavation <br /> Page 8 of 11 <br />