SITE INFORMATION AND CORRESPONDENCE

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California Stop - 2 - February 23, 2012 Monitoring Well Information Well Designation Date Installed Screen Interval Depth to Water (feet bgs) (feet bgs) (Jul 2011) MW-1 Aug05 10-30 16.68 MW-2 Aug05 10-30 16.12 MW-3 Aug05 10-30 16.00 MW-4 Aug07 10-30 17.38 MW-5 --Aug 07 10-30 17.05 MW-6 --Aug 07 10-30 17.24 MW-7 Aug07 10-30 16.92 MW-8 Aug07 10-30 16.51 Petroleum H drocarbon Constituent Concentration Contaminant Soil mg/kg) Water u /L WQOs Maximum Latest Maximum Latest (ug/L) _ Jul 2011 TPHg NA NA 1,200,000 19,000 5 Benzene NA NA 580 1.9 0.15 Toluene NA NA 250 <0.5 42 Eth (benzene NA NA 13,000 7.9 29 Xylenes NA NA 34,000 <1 17 MTBE NA NA 910,000 16,000 5 TBA NA NA 240,000 130,000 12/1,200a 1,2-DCA NA NA 16 NA 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 California Department of Public Health Notification Level/Response Level Site Description The Site is located at 2224 South Manthey Road in Stockton, California and is an active retail gasoline station. The Site is bounded by Highway 5 to the northeast, a business to the northwest and South Manthey Road to the south. The surrounding land use is mixed residential and commercial. Site History/Assessments In February 2002, soil contamination was identified by an environmental investigation. To date. eight monitoring wells have been installed and monitored regularly. A Site map showing the location of the current USTs, monitoring wells and groundwater level contours is provided at the end of this five year summary. Remediation Summary • Free Product: No free product was documented throughout the life of this case • Soil Excavation: Unknown • In-Situ Soil/ Groundwater Remediation: Batch groundwater extraction, removed 27,400 gallons of contaminated groundwater and 0.32 pounds of MTBE. Soil vapor extraction and ozone sparging are proposed.