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Tracy Marine `- - 2 - J October 31, 2011 <br /> Monitoring Well Information <br /> Well Designation Date Installed Screen Interval Depth to Water <br /> (feet bgs) (feet bgs) <br /> Mar 2011 <br /> MW-1 Dec 99 4-19 7.96 <br /> MW-2 Dec 99 5-20 7.91 <br /> MW-3 Dec 99 5-20 7.35 <br /> MW-4 Dec 99 5-20 7.76 <br /> MW-5 Dec 99 5-20 7.49 <br /> MW-6 Dec 99 27-32 8.11 <br /> MW-7 Dec 99 5-20 8.09 <br /> MW-8 Dec 99 5-20 7.55 <br /> MW-9 Mar 01 5-20 7.91 <br /> MW-10 Mar 01 5-20 7.75 <br /> MW-11 Mar 01 5-20 8.27 <br /> Petroleum H drocarbon Constituent Concentration <br /> Contaminant Soil (mg/kg) Water (ug/L WQOs <br /> Maximum Latest Maximum Latest (uglL) <br /> Mar 2011 b <br /> TPHg NA NA 44,000 <50 5 <br /> Benzene NA NA 1,900 NA 1 <br /> Toluene NA NA 1,100 NA 150 <br /> Eth (benzene NA NA 360 NA 300 <br /> Xylenes NA NA 485 NA 1,750 <br /> MTBE NA NA 43,000 <1 5 <br /> TBA NA NA 3,400 X10 12/1,200a <br /> 1,2-DCA NA NA 15 NA 0.5 <br /> NA: Not Analyzed, Not Applicable or Data Not Available <br /> mglkg: 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 /> MW-7 only <br /> Site Description <br /> The Site is located at 2450 Toste Road in Stockton, California and is an active business. The <br /> Site is bounded by Toste Road to the north and businesses to the east, west and south. The <br /> surrounding land use is commercial. <br /> Site History/Assessments <br /> In October 1996, soil contamination was identified during the removal of USTs. To date, 11 <br /> monitoring wells have been installed and monitored regularly. A Site map showing the location <br /> of the monitoring wells and groundwater level contours is provided at the end of this five year <br /> summary. <br />