SITE INFORMATION AND CORRESPONDENCE

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Mabel E. Keir : - 2 - • August 11, 2011` • Groundwater Flow Direction: Predominately to the southeast at approximately 0.002 feet/foot. • Soil Types: The S to 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) (May 2011 MW-1 Nov 04 10-30 15.21 MW-2 Nov 04 15-35 15.57 MW-3 Nov 04 15-35 15.91 MW-4 Dec 06 15-35 - MW-5 Dec 06 15-35 15.51 MW-6 Dec 06 15-35 15.23 MW-7 Dec 06 15-35 _1 5.34 MW-8 Dec 06 55-65 15.50 MW-9 Aug07 110-120 15.81 MW-10 Aug07 50-60 15.32 MW-11 Aug07 55-65 15.43 MW-12 Oct 10 62-72 16.82 Petroleum Hydrocarbor Constituent Concentration Contaminant Soil m /k Water u /L WQOs Maximum Latest Maximum Latest * Ma 2011 TPH NA NA 240,000 190,000 5 Benzene NA NA 14,000 4,700 0.15 Toluene NA NA 85,000 26,000 42 Eth (benzene NA NA 16,000 4,100 29 Xylenes NA NA 79,000 23,500 17 MTBE A NA NA <1 5 TBA A NA NA <10 12/1,200- 1,2-DCA A NA 1,300 150 0.5 NA: Not Analyzed, Not Applicable or Data Not Available mg/kg: milligrams per kilogram, parts per million ug/L: micrograms per liter, pails 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 16 1 French Camp Turnpike in Stockton, California. The Site is bounded by businesses to the west, north and south and French Camp Turnpike to the east. The surrounding land use is commercial. Site History/Assessments In September 2003, soil contamination was identified during an environmental investigation. To date, 12 monitoring wells have been installed and monitored regularly. A Site map showing the location of the monitorin wells and groundwater level contours is provided at the end of this five year summary.