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ID (91819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> war Analytical <br /> 6)921-9600 <br /> FAX(916)921-0100 <br /> Delta Environmental Consultants Project: Arco 2130,Stockton,CA Sampled: 9/28/99 <br /> 3164 Gold Camp Drive,Ste.200 Project Number: N/A Received: 9/29/99 <br /> Rancho Cordova,CA 95670 Project Manager: Ben Heningburg Reported: 9/30/99 <br /> Total Purgeable Hydrocarbons(C6-C12)and BTEX by DHS LUFT/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov.Limits % Limit % Notes* <br /> LCS(continued) 9090336-BSI <br /> Ethylbenzene 9/30/99 0.200 0.199 mg/kg 70.0-130 99.5 <br /> Xylenes(total) _ 0.600 0.541 70.0-130 90.2 _ <br /> Surrogate: a,a,a-Tris luorotoluene 0.200 0.235 60.0-140 117 <br /> Matrix Spike 9090336-MS1 S909414-06 <br /> Benzene 9/30/99 0.200 ND 0.188 mg/kg 60.0440 94.0 <br /> Toluene 0.200 ND 0.181 60.0-140 90.5 <br /> Ethylbenzene 0.200 ND 0.188 60.0-140 94.0 <br /> Xylenes(total) 0.600 ND 0.514 60.0-140 _85.7 <br /> Surrogate: a,a,a-Triuorotoluene 0.200 0.237 60.0-140 118 <br /> Matrix Spike Dup 9090336-MSDI S909414-06 <br /> Benzene 9/30/99 0.200 ND 0.193 mg/kg 60.0-140 96.5 25.0 2.62 <br /> Toluene 0.200 ND 0.186 60.0-140 93.0 25.0 2.72 <br /> Ethylbenzene 0.200 ND 0.193 60.0-140 96.5 25.0 2.62 <br /> Xylenes(total) _ 0.600 ND 0.526 60.0-140 87.7 _25.02.31 _ <br /> Surrogate: a,a,a-Triuorotoluene 0.200 0.233 60.0-140 116 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> Page 9 of 11 <br />