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Superior PreC%S!0/7 .Arna/ytiCa/, /17C- <br /> A member of ESSCON Environmental Support Service Consortium <br /> Gasoline Range Petroleum Hydrocarbons and BTXE <br /> by EPA SW-846 5030/8015M/6020 <br /> Gasoline Range quantitated as all compounds from C6-C10 <br /> Quality Assurance and Control Data <br /> Laboratory Number 81623 <br /> Compound Sample SPK Level SPK Result Recovery Limits RPD <br /> conc 96 <br /> For Water Matrix (ug/L) <br /> BE241 19 02 / 03 - Sample Spiked 81590 - 03 <br /> Gasoline Range ND 294 270/247 92/64 65-135 9 <br /> Benzene ND 20 17/16 85/80 65-135 6 <br /> Toluene ND 20 17/16 85/80 65--135 6 <br /> Ethyl Benzene ND 20 18/17 90/85 65-135 6 <br /> Total Xylenes ND 60 54/51 90/85 65-135 6 <br /> >> Surrogate Recoveries (k) << <br />.Trifluorotoluene (SS) 90/89 50-150 <br /> Definitions <br /> ND = Not Detected <br /> RL = Reporting Limit <br /> NA = Not Analysed <br /> RPD = Relative Percent Difference <br /> ug/L = parts per billion (ppb) ug/kg = parts per billion (ppb) <br /> mg/L = parts per million (ppm) mg/kg = parts per million (ppm) <br />. Page 4 of 4 <br /> Certified Laboratories <br /> 825 Arnold [Dr, Suite 114 1555 Burke St , Unit 1 309 S Cloverdale St Suite B-24 <br /> Martinez, California 94553 San Francisco California 94124 Seattle Washington 98108 <br /> (510) 229-1512 /fax (510) 229-1526 (415) 647-2081 /fax (415) 821-7123 (206) 763-2992 /fax (206) 763-8429 <br />