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Superior Frecisior7 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 90872 <br /> Method Spike <br /> Compound Blank RL Recovery Limits RPD <br /> (ug/L) (ug/L) (o) (a) (o) <br /> Gasoline ND<50 50 94/88 70-130 70 <br /> Benzene ND<0 5 0 5 - 117/117 70-130 Oo <br /> Toluene ND<0 5 0 5 111/112 70-130 10 <br /> Ethyl Benzene ND<0 5 0 5 105/104 70-130 to <br /> Total Xylenes IS2<0 5� 0 5 117/11.5 70-130 206 <br /> Definitions I I► l� <br /> ND = Not Detected <br /> RPD = Relative Percent Difference Accoun Ad-%fodatje <br /> RL = Reporting Limit Senior Chemist <br /> ug/L = Parts per billion (ppb) <br /> QC File No 90872 <br /> Page 3 of 3 <br /> Cerrrfred Laboratories <br />