SITE INFORMATION AND CORRESPONDENCE FILE 1

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West Clay Properties - 3 - April 2012 Petroleum Hydrocarbon Constituent Concentration Contaminant Soil m /k Water (u/L WQOs Maximum Latest Maximum Latest (ug/L) a June 2011 TPHg NA NA 27,000 14,000 5 TPHd NA NA 20,000 1,000 56 Benzene NA NA 8,300 1,600 0.15 Toluene NA NA 600 53 42 Eth (benzene NA NA 2,800 390 29 Xylenes NA NA 4,040 354 17 MTBE NA NA 790 22 5 TBA NA NA 480 <10 12/1,2005- 1,2-DCA NA NA 1 110 30 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 a According to GeoTracker, wells b California Department of Public Health Notification Level/Response Level Site Description The Site is located at 639 West Clay Street in Stockton, California and actively dispenses fuel. The Site is bounded by Interstate 5 to the west, a residence to the east and parking lot to the north and south. The surrounding land use is mixed residential and commercial. Site History/Assessments In May 1989, USTs failed a tank tightness test. To date, 34 monitoring wells have been installed and monitored regularly. A Site map showing the location of the current and former 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: Approximately 550 cubic yards of impacted soil were removed and disposed offsite in 2003. • In-Situ Soil Remediation: No soil remediation has been conducted. • Groundwater Remediation: Ozone sparging, November 2007 through present. General Site Conditions • Geology and Hydrogeology: The Site is underlain by interbedded and intermixed sand, silt and clay. The depth to groundwater is between 13 and 15 feet bgs and the groundwater gradient is variable.