SITE INFORMATION AND CORRESPONDENCE

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RMB Garage . 2 - August 30, 2011 • Groundwater Flow Direction : Predominately to the northeast with an average gradient of 0. 005 feet/foot. • 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) Feb 2011 ) MW-1 Sep 03 20-40 MW-2 Sep 03 2040 24. 10 MW-3 Sep 03 20-40 - MW-4 Sep 03 20-40 MW-5 Nov 05 20-40 24 . 31 MW-6 Nov 05 2040 23 .48 MW-7 Feb 05 20-40 24 . 72 MW-8 Dec 05 20-40 23 . 81 MW-9 Dec 05 20-40 MW- 10 Mar 07 2040 23. 55 MW-11 Mar 07 20-40 24. 31 MWA2 Mar 07 88-98 24. 58 MW-13 Mar 07 20-40 25 . 16 MW-14 Aug10 50-60 24 . 93 MW-15 Aug10 50-60 23 . 68 Petroleum Hydrocarbon Constituent Concentration Contaminant Soil (mg/k Water (ug/L WQOs Maximum Latest Maximum Latest (ug/L) * Feb 2011 TPHg NA NA 580, 000 66 , 000 5 TPHd NA NA 95, 000 20 , 000 56 Benzene NA NA 300 , 000 41500 0. 15 Toluene NA NA 430, 000 7 , 500 42 Eth (benzene NA NA 327000 40100 29 Xylenes NA NA 136, 000 19, 800 17 MTBE NA NA 1 < 10 < 1 5 TBA NA NA < 100 < 10 12/1 ,200a 112-DCA NA NA 1 , 100 62 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 a California Department of Public Health Notification Level/ Response Level Site Description The Site is located at 715 North Hunter Street in Stockton , California and is an auto maintenance facility. The Site is bounded by a business to the west, Flora Street to the north , North Hunter Street to the east and East Park Street to the south. The surrounding land use is mixed residential and commercial .