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. 3 • October 25, 2011 <br /> Frontier Transportation <br /> Petroleum H drocarbon Constituent Concentration Water u /L WQOs <br /> Contaminant Soil m /k Maximum Latest (ug/L) <br /> Maximum Latest A r 2011 <br /> 33,000 4,980 5 <br /> TPH NA NA 25.6 1 <br /> NA NA 2,300 150 <br /> Benzene NA 683 <0.5 <br /> Toluene NA 3,800 12 300 <br /> Eth (benzene NA NA <br /> NA NA 6,500 1.6 1,750 <br /> Xylenes 43,000 1,910 5 <br /> MTBE NA NA 2,200 281 12/1,200a <br /> TBA NA NA Nq <0.5 0.5 <br /> 1,2-DCA NA <br /> NA: Not Analyzed, Not Applicable or Data Not Available <br /> mg/kg: milligrams per kilogram, parts per million <br /> ug/L: micrograms per liter, parts per billion <br /> WQOs: Water Quality Objectives <br /> According to GeoTracker,wells <br /> a California Department of Public Health Notification Level/Response Level <br /> Site Description <br /> The Site is located at The Site is bounded by2businesses to the wet and 5 Larch Road in Tracy, lnorth, Industrial Way totheleast gasoline <br /> nd Wetstn. <br /> Larch Road to the south. The surrounding land use is commercial. <br /> Site History/Assessments <br /> identified during the removal of USTs. date, 2 <br /> In August 1995, soil contamination was d monitored regularly. A Site map showing the location <br /> monitoring wells have been installed an <br /> of the former USTs, monitoring wells and groundwater gradient and MTBE concentration <br /> contours is provided at the end of this five year summary. <br /> Remediation Summary <br /> Free Product: Free product noted in MW 2, MW 3r, MW 21, MW 22, MW 23, an <br /> • MW-24, no free product noted since 2009. <br /> • Soil Excavation: Unknown <br /> In-Situ Soil/ Groundwater Remediation: Dual phase extraction, pending <br /> •General Site Conditions <br /> Geology and Hydrogeology: The Site is underlain by interbedded and intermixed son <br /> • silt and clay. The depth to groundwater is approximately 8 feet bgs and the groundwater <br /> gradient is southwest at approximately 0.0008 feet per foot <br /> • Groundwater Trends: There are more than 15 years of groundwater monitoring data for <br /> this Site. MTBE trends are shown below, source area (MW-21), near down gradient <br /> (MW-19) and far down gradient (MW-17) <br />