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C. Navarra Property Soo, - 3 - N001 April 2012 <br /> Petroleum H drocarbon Constituent Concentration <br /> Contaminant Soil (mg/kg) Water (ug/L WQOs <br /> Maximum Latest Maximum Latest (ug/L) <br /> a Jul 2011 <br /> TPHg NA NA 86,000 1,700 5 <br /> TPHd NA NA 1,400,000 2,000 56 <br /> Benzene NA NA 2,100 200 0.15 <br /> Toluene NA NA 6,900 13 42 <br /> Eth (benzene NA NA 4,200 34 29 <br /> Xylenes NA NA 25,000 250 17 <br /> MTBE NA NA 2,400 500 5 <br /> TBA NA NA 1,000 140 1211,200 <br /> 1,2-DCA NA NA NA NA 0.5 <br /> NA: Not Analyzed, Not Applicable or Data Not,Available <br /> mg/kg: milligrams per kilogram, parts per million <br /> ug1L: micrograms per liter, parts per billion <br /> WQOs: Water Quality Objectives <br /> a According to GeoTracker, wells <br /> b California Department of Public Health Notification Level/ Response Level <br /> Site Description <br /> The Site is located at 7500 West 11th Street in Tracy, California. The Site is bounded by an <br /> empty lot to the west, 11th Street to the north, Chrisman Road to the east and a bsuiness to the <br /> south. The surrounding land use is mixed residential and commercial. <br /> Site History/Assessments <br /> In February 1993, soil contamination was identified during an environmental investigation. To <br /> date, 27 monitoring wells have been installed and monitored regularly. A Site map showing the <br /> location of the former USTs, monitoring wells and groundwater level contours is provided at the <br /> end of this five year summary. <br /> Remediation Summary <br /> • Free Product: Free product noted in MW-7 (up to 0.55 feet). Approximately 2,000 <br /> gallons of free product groundwater mixture has been removed since 1999. None noted <br /> since 2005. <br /> • Soil Excavation: Approximately 521 tons of impacted soil were removed and disposed <br /> offsite in 1998. <br /> • In-Situ Soil/ Groundwater Remediation: Soil vapor extraction and air sparging, <br /> conducted from November 1995 through April 1997. <br /> General Site Conditions <br /> • Geology and Hydrogeology: The Site is underlain by interbedded and intermixed gravel, <br /> sand, silt and.clay. The depth to groundwater varies between 5 and 10 feet bgs and the <br /> groundwater gradient is northeast at approximately 0.003 ft/ft. <br />