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Superior Precisio17 Ana/ytiCa/, /rnc. <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: 50549 <br /> Compound Sample SPK Level SPK Result Recovery Limits RPD <br /> conc. % % % <br /> For Water Matrix (ug/L) <br /> BC031.20 02 / 03 - Laboratory Control Spikes <br /> Gasoline Range 180 190/200 106/111 65-135 5 <br /> Benzene 10 9.17/8.91 92/89 65-135 3 <br /> Toluene 10 9.45/9.43 95/94 65-135 1 <br /> Ethyl Benzene 10 9.71/9.80 97/98 65-135 1 <br /> Total Xylenes 30 29.3/30.0 98/100 65-135 2 <br /> » Surrogate Recoveries (%) << <br /> Trifluarotoluene (SS) 74/75 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 /> g/L = parts per million (ppm) mg/kg = parts per million (ppm) <br /> Page 4 of 4 <br /> Certified Laboratories <br /> 825 Arnold Dr Suite 1 14 1555 Burke St Unit 1 309 S Cloverdale St Suite B-24 <br /> Martinez California 94553 San Francisco California 94124 Seattle Washington 98108 <br /> (5 10) 229-1512 / fax (510) 229-1526 {415) 647-2081 / fax (415) 82 1-7 123 (2061763-2992 / fax {206) 763-8429 <br />