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Sequoia 819 Striker Avenue,Suite 8 <br /> 1 Sacramento,CA 95834 <br /> (916)921-9600 <br /> Analytical <br /> FAX(916)921-0100 <br /> Espana Geotechnical Consulting Project: Highway 99/Hammer Lane Interchange Sampled: 10/19/99 <br /> 502 Guiseppe Court,Ste. 1 1 Project Number: N/A Received: 10/20/99 <br /> Roseville,CA 95678 Project Manager: Michael Wilson Reported: 11/1/99 <br /> Total Purgeable Hydrocarbons(C6-C12)and BTEX by DHS LUIFT/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Analyte Analvzed Level Result Result Units Recov.Limits % Limit % Notes' <br /> LCS(continued) 9100278-BS1 <br /> Ethylbenzene 10/25/99 0.200 0.184 mg/kg 70.0-130 92.0 _ <br /> Xylenes(total) 0.600 0.551 70.0-130 91.8 <br /> Surrogate: a,a,a-Tris luorotoluene 0.200 0.185 60.0-140 92.5 <br /> Matrix Spike 9100278-NISI S910255-06 <br /> Benzene 10/25/99 0.200 ND 0.201 mg/kg 60.0-140 101 <br /> Toluene 0.200 ND 0.208 60.0-140 104 <br /> Ethylbenzene 0.200 ND 0.200 60.0-140 100 <br /> Xylenes(total) 0.600 ND 0.619 60.0`-140 103 <br /> Surrogate: a,a,a-Tri,Jluorotoluene 0.200 0.223 60.0-140 112 <br /> Matrix Spike Dui) 9100278-NISD1 S910255-06 <br /> Benzene 10/25/99 0.200 ND 0.196 mg/kg 60.0-140 98.0 25.0 3.02 <br /> Toluene 0.200 ND 0.200 60.0-140 100 25.0 3.92 <br /> Ethylbenzene 0.200 ND 0.199 60.0-140 99.5 25.0 0.501 <br /> Xylenes(total) 0.600 ND 0.613 60.0-140 102 25.0 0.976 <br /> Surrogate: a,a,a-Tris luorotoluene 0.200 0.221 60.0-140 110 <br /> Sequoia Analytical-Sacramento 'Refer to end of report for text of notes and definitions. <br /> Page 6 of 8 <br />