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TABLE 1 <br /> GROUNDWATER ELEVATION AND ANALYTICAL SUMMARY <br /> Joe's Truck Plaza <br /> 15600 Harlan Road, Lathrop, California <br /> Depth to Well Groundwater Ethyl- Total <br /> Well Date Water Elevation Elevation TPHD TPHG Benzene Toluene benzene Xylenes MTBE <br /> Number Collected (feet) (ft ms]) (ft msl) (IWL) (µglL) (µg/L) (n/L) WL) (µg/L) ( ) <br /> MWO-1X 02/27/02 768 1369 601 NA ND[1] ND ND ND ND 570 <br /> 05/21/02 791 578 NA ND[l] ND ND ND ND 470 <br /> 08/29/02 825 544 NA ND[1] ND ND ND ND 220 <br /> 12/10/02 9 04 465 NA ND[1] ND ND ND ND 94 <br /> 03/28/03 831 538 NA <50[1] <0 50 <0 50 <0 50 <0 50 570 <br /> 05/21/03 804 565 NA <20011] <2 0 <2 0 <2 0 <2 0 780 <br /> 09/15/03 921 448 240[3] <50 <0 50 <0 50 <0 50 <0 50 57 <br /> Note <br /> ms]=Mean sea level <br /> MTBE=Methyl Cert-butyl ether mg/L= micrograms per liter <br /> PHD=Total petroleum hydrocarbons as diesel NA Not Analyzed <br /> TPHG=Total petroleum hydrocarbons as gasoline ND—Not Detected at Method Detection Limits <br /> TPHD and TPHG analyzed using EPA Method 8015B and the remaining analytes using EPA Method 8260B NM=Not measured <br /> NS=Not sampled <br /> [11=TPHD and TPHG analyzed using EPA Method 8260E <br /> [21=Reporting limits were increased due to sample matrix interferences <br /> 13]=Reported concentration includes additional compounds uncharacteristic of common fuels and lubricants <br /> Data prior to September 15,2003 provided by Avalon Environmental Consultants <br /> Joe's Truck Plaza Quarterly_Data Page 5 of 5 5 TKA TU5 <br />