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o Superior Precision Analytical, InC. <br /> 825 Arnold Drive, Suite 1 14 ■ Martinez, California 94553 • (510) 229-1512 / fax (510) 229-1526 <br /> VOLATILE PETROLEUM HYDROCARBONS <br /> Quality Assurance and Control Data - Water <br /> Laboratory Number 88813 <br /> Average <br /> Method Spike <br /> Compound Blank PQL Recovery Limits RPD <br /> (ug/L ) (ug/L ) {%) (%) {%) <br /> Gasoline : ND<50 50 820 70-1.30 00-. <br /> Benzene : ND<0 .3 0 . 3 970 70-130 1% <br /> Toluene : ND<0 . 3 0 . 3 10001 70-130 29.- <br /> Ethyl <br /> %Ethyl Benzene : ND<0 . 3 0 . 3 10316 70-130 1% <br /> Xylenes : ND<0 . 9 0 . 9 102% 70-130 1% <br /> Definitions : <br /> ND = Not Detected RPD = Re ative Pe cent Difference <br /> PQL = Practical Quantitation Limit / <br /> QC File No . 88813 / <br /> Senior Analyst <br /> Page 3 of 3 <br /> Certified Laboratories <br />