SITE INFORMATION AND CORRESPONDENCE

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w Stallworth Auto Detail . 2 - April 2012 • Groundwater Flow Direction : Predominately to the northeast to east with an average gradient of 0.005 feet/foot (ft/ft) in October 2011 . ESoil Types: The Site is underlain by interbedded and intermixed sand, silt and clay Monitoring Well Information I Well Designation Date Installed Screen Interval Depth to Water (feet bgs) (feet bgs) Oct 2011 MW-la Jan 06 20-40 26.00 MW-lb Jan 06 30-50 26.35 MW-1C Jan 06 125- 135 26.60 MW-1d Jan 06 140- 150 27. 01 - MW-2 Jun 00 30-50 26.20 MW-3 Jun 00 20-40 27,45 MW-4 Jun 00 20-40 26 . 21 MW-5 Jun 02 2040 26 . 60 MW-6 Jun 02 20-40 27 . 11 MW-7 Jun 07 60-70 27 . 76 MW-8 Jun 07 60-70 27. 19 MW-9 Mar 08 60-70 27. 18 MW- 10 Mar 08 60-70 27 . 37 MW-11 Mar 08 60-70 28 . 01 Petroleum H drocarbon Constituent Concentration Contaminant Soil (m /kg) Water (ug/L) WQOs Maximum Latest Maximum Latest (ug/L) a Oct 2011 TPHg NA NA 470, 000 290, 0000 5 TPHd NA NA 140, 000 1001000 56 Benzene NA NA 50 , 000 14, 000 0 . 15 Toluene NA NA 180, 000 867000 42 Eth (benzene NA NA 36 , 000 1 125000 29 Xylenes NA NA 186, 000 747000 17 MTBE NA NA 21600 < 10 5 TBA NA NA ND < 1 12/11200 112-DCA NA NA 390 120 0. 5 NA: Not Analyzed , Not Applicable or Data Not Available mg/kg: milligrams per kilogram , parts per million ug/L: micrograms per liter, parts per billion WQOs: Water Quality Objectives a According to GeoTracker, wells b California Department of Public Health Notification Level/ Response Level Site Description The Site is located at 602 North California Street in Stockton , California. The Site is bounded by North California Street to the west, businesses to the north and east and East Oak Street to the south . The surrounding land use is mixed residential and commercial .