SITE INFORMATION AND CORRESPONDENCE

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Top Filling Station • - 2 - • October 23, 2011 Monitoring Well Information Well Designation Date Installed Screen Interval Depth to Water (feet bgs) (feet bgs) June 2011 MW-1 Jan 95 60-80 35.05 MW-2 Jan 95 60-80 35.94 MW-3 Jan 95 60-80 36.11 MW-4 Dec 95 55-75 MW-5 Jan 96 50-70 35.42 MW-6A May 00 35-55 36.76 MW-613 May 00 50-55 36.85 MW-6C May 00 70-75 35.92 MW-61D May 00 100-105 35.90 MW-6E May 00 137-142 35.90 MW-7A May 00 35-45 36.83 MW-7B May 00 50-55 36.70 MW-7C May 00 70-75 35.92 MW-7D May 00 105-110 35.90 MW-7E May 00 125-175 35.88 MW-8 Jul 03 35-55 - Petroleum H drocarbon Constituent Concentration Contaminant Soil m /k Water (ug/L WQOs Maximum Latest Maximum Latest (ug/L) * June 2011 TPI-Ig NA NA 210,000 88,000 5 Benzene NA NA 87,000 37,000 1 Toluene NA NA 75,000 7,500 150 Eth (benzene NA NA 14,000 1,800 300 Xylenes NA NA 24,000 9,300 1,750 MTBE NA NA 71,000 900 5 TBA NA NA 700 <10 12/1,200a 1,2-DCA NA NA 390 140 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 e California Department of Public Health Notification Level/Response Level Site Description The Site is located at 101 South Wilson Way in Stockton, California. The Site is bounded by a residence to the west, East Market Street to the north, South Wilson Way to the east and a business to the south. The surrounding land use is mixed residential and commercial. Site History/Assessments In February 1989, soil contamination was identified during the removal of USTs. To date, eight monitoring wells have been installed and monitored regularly. A Site map showing the location