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Superior Rrecision Ana/ytica/, /roc- <br /> A member of ESSCON Environmental Support Service Consortium <br /> Gasoline Range Petroleum Hydrocarbons and BTXE <br /> by EPA SW-846 5030/8015M/8020 <br /> Gasoline Range quantitated as all compounds from C6-C10 <br /> Quality Assurance and Control Data <br /> Laboratory Number 81624 <br /> Compound Sample SPK Level SPK Result Recovery Limits RPD <br /> conc <br /> For Water Matrix (ug/L) <br /> BE251 19 02 / 03 - Sample Spiked 81623 - 02 <br /> Gasoline—Range ND 320 291/278 91/87 65-135 4 <br /> Benzene ND 20 16/16 80/80 65-135 0 <br /> Toluene ND 20 16/16 80/80 65-135 0 <br /> Ethyl Benzene ND 20 18/17 90/85 65-135 6 <br /> Total Xylenes ND 60 49/49 82/82 65-135 0 <br /> >a Surrogate Recoveries { ) « <br /> .Trifluorotoluene (SS) 90/90 50-150 <br /> For Water Matrix (ug/L) <br /> BE261 19 03 / 04 - Sample Spiked 81624 - 03 <br /> Gasoline—Range ND 320 280/270 88/84 65-135 5 <br /> Benzene ND 20 18/16 90/80 65-135 12 <br /> Toluene ND 20 19/17 95/85 65-135 11 <br /> Ethyl Benzene ND 20 19/18 95/90 65-135 5 <br /> Total Xylenes ND 60 58/54 97/90 65-135 7 <br /> 7> Surrogate Recoveries ('t) « <br /> Trifluorotoluene (SS) 101/98 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 />