SITE INFORMATION AND CORRESPONDENCE

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- I - Stallworth Auto Detail w2 - 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 . • Soil Types : The Site is underlain by interbedded and intermixed sand , silt and clay ! Monitoring Well Information Well Designation Date Installed Screen Interval Depth to Water (feet bgs) (feet bgs) ri i Oct 2011 i MW- 1a Jan 06 2040 26, 00 MW- 1b 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 2040 26, 21 MW-5 Jun 02 20-40 26 , 60 MW-6 Jun 02 2040 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 MWA 1 Mar 08 60-70 28. 01 Petroleum H drocarbon Constituent Concentration Contaminant Soil m /kg Water (ug/L WOOS Maximum Latest Maximum Latest (ug/L) a Oct 2011 TPI-Ig NA NA 470, 000 290, 0000 5 TPHd NA NA 140, 000 100,000 56 Benzene NA NA 50, 000 14, 000 0, 15 Toluene NA NA 180 , 000 86 , 000 42 Eth (benzene NA NA 36 , 000 12, 000 29 Xylenes NA NA 186, 000 74, 000 17 MTBE NA NA 2 , 600 < 10 5 TBA NA NA ND < 1 12/1 , 200 112-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 ' 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.