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1 <br /> Superior Precision Ana/ytica/, Inc. <br /> 825 Arnold Drive, Suite 1 14 - Martinez, California 94553 • (51 0) 229-1512 / fax (5 10) 229 151.6 <br /> VOLATILE PETROLEUM HYDROCARBONS <br /> Quality Assurance and Control Data - Water <br /> Laboratory Number 87644 <br /> Average SPIKE <br /> ' Compound Blank PQL Recovery Limits RPD LEVEL <br /> (ug/L ? (ug/L ) (°s) (°s) (o) ( ng } <br /> Gasoline : ND<50 50 9396 75-125 906 200 <br /> Benzene : ND<0 . 3 0 . 3 9296 75-125 1106 200 <br /> Toluene : ND<0 . 3 0 . 3 9716 75-125 1216 200 <br /> Ethyl Benzene : ND<0 . 3 0 . 3 1010 75-125 140 200 <br /> Xylenes : ND<0 . 3 0 . 3 102% 75-125 11% 200 <br /> 1 <br /> i <br /> 1 <br /> i <br />' Definitions : <br /> ND = Not Detected RPD = Relative Percent Difference <br />' PQL = Practical Quantitation Limit <br /> QC File No. 87644 <br /> Senior Anal <br /> II Page - 3 of 3 <br /> Certified Laboratories <br />