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illSuperior Precision Analytical. Inc. <br /> -,825 Arnold Drive Suite 1 14 ■ Martinez C81,fornia 94553 ■ (510) 229-1512 /fax (510) 229-1526 <br /> iVOLATILE PETROLEUM HYDROCARBONS mtt <br /> Quality Assurance and Control Data - Water <br /> Laboratory Number 90824 <br /> Method Spike <br /> Compound Blank RL Recovery Limits RPD <br /> (ug/L) (ug/L) (o} (a) (o} <br /> Gasoline ND<50 50 87/88 70-130 to <br /> Benzene ND<0 5 0 5 102/97 70-130 50 <br /> Toluene ND<0 5 0 5 97/95 70-130 20-. <br /> Ethyl Benzene - ND<0 5 0 5 102/101 70-130 10, <br /> Total Xylenes ND<0 5 0 5 114/112 70-130 24 <br /> 0 <br /> Definitions <br /> ND = Not Detected <br /> RPD = Relative Percent Difference <br /> RL = Reporting Limit <br /> ug/L = Parts per billion (ppb) Senior Chemist <br /> QC File No 90824 Account Manager <br />. Page 4 of 4 <br /> Certified Laboratories <br />