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Superior Precision Aria/ytica/, /nc_ <br /> 1555 Burke Unit I • San Francisco California 94 124 ■ (4 15) 647-2081 / fax (4 1 5) 82 1-7 123 <br /> Go <br /> Purgeable Aromatic Hydrocarbons by Method 8020 <br /> Quality Assurance and Control Data - Water <br /> Laboratory Number 56452 <br /> Average <br /> Method Spike <br /> Compound Blank PQL Recovery Limits RPD <br /> (ug/L ) (ug/L ) M (-%) (-%) <br /> Benzene: ND<0. 3 0. 3 102% 71-106 1% <br /> Toluene: ND<0. 3 0. 3 99% 69-116 0% <br /> Ethyl Benzene: ND<0. 3 0. 3 300% 66-121 0% <br /> Chlorobenzene: ND<0. 3 0. 3 <br /> 1, 4-Dichlorobenzene: ND<0. 3 0. 3 <br /> 1, 3-Dichlorobenzene: ND<0. 3 0. 3 <br /> 1, 2-Dichlorobenzene: ND<0. 3 0. 3 <br /> Xylenes: ND<0. 9 0. 9 101% 67-108 2% <br /> 0 <br /> Definitions: <br /> ND = Not Detected RPD = Relative Percent Difference <br /> PQL = Practical Quantitation Limit <br /> QC File No. 56452ff j� <br /> enior Anal st <br /> 0 Page 3 of 3 <br /> Certified Laboratories <br />