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® TABLE -Continued <br /> LEACHATE MONITORING SUMMARY <br /> SECOND SEMESTER 2012 <br /> NORTH COUNTY RECYCLING CENTER AND SANITARY LANDFILL <br /> (Units mg/I unless noted) <br /> L-1 L-3 L-4 <br /> Sampling Designation Area 1 sum Area 3 sum Area 4 sum <br /> Sampling Date 8/1/12 8/1/12 8/1/12 <br /> Volatile Organic Compounds(ug/L)-Continued <br /> n-Propylbenzene 0.32* 0.13* 0.19* <br /> Tetrachloroethene ND ND 0.14* <br /> Toluene 2.4 2.9 0.55 <br /> Trichloroethene 0.28* 0.10* 0.11* <br /> 1,2,4-Trimethylbenzene 6.4 0.98 0.67 <br /> 1,3,5-Tri methyl benzene 1.8 0.32* 0.16* <br /> Vinyl chloride 3.8 0.33* 4.0 <br /> Total Xylenes 23 7.4 7.3 <br /> Acetone ND 6,900 ND <br /> 2-Hexanone ND 130 ND <br /> Methyl ethyl ketone ND 2,200 ND <br /> ® Methyl isobutyl ketone ND 9.0* ND <br /> ND= Not Detected <br /> NM = Not Measured <br /> *=Trace Concentration (estimated value) <br /> {1}= Parameter found in one or more quality control blank. <br /> North County RC&SL Public Works/Solid Waste <br /> 2°d Semester and Annual 2012 Groundwater Monitoring 25 County of San Joaquin—January 15,2013 <br />