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819 Striker Avenue, Suite$ <br /> Sequoia Sacramento,CA 95834 <br /> (916)921-9600 <br /> �,,, r Analytical FAX(916)9z1-olo0 <br /> EMCON/Pinnacle-Cameron Park Project: ARCO 2186,Stockton Sampled: 8%23199 to 8126199 <br /> 3939 Cambridge Road,Ste.220 Project Number: NIA Received: 8/27/99 <br /> Cameron Park,CA 95682 Project Manager: Mark CEPS Reported: . 9113199 <br /> Total Purgeable Hydrocarbons'(C6-04 BTEX and MTBE by DHS LOFT/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> IAnal�2 An <br /> Level Result Result Units Recov. Limits % Limit % Notes* <br /> LCS ntin <br /> Methyl utyl ether 8/30/9 � 0.200 0.148 mg/kg 70.0-130 74.0 <br /> Surrogate: a,a,a-Trifluorotoluene 0.200 0.173 60.0-140 86.5 <br /> Matrix Spike 9080259 M:z1 S90835$47 <br /> Benzene 8/30/99 0.200 ND 0.169 mg/kg 60.0-140 845 <br /> Toluene 0.200 ND 0.165 60.07140 82.5 <br /> Ethylbenzene 0.200 ND 0.163 1' 60.0-140 81.5 <br /> Xylenes(total) 0.600 ND 0.486 60.0-140 81.0 <br /> Methyl tert-butyl ether 0.200 ND 0.160 60.0-140 80.0 <br /> Surrogate: a,a.a-Trifluorotoluene 0.100 0.180 60.0-140 90.0 <br /> Matrix Spike Duo 9080259-MS]21 5908358-0 L <br /> 0.170 mg/kg 60.0-140 85.0 25.0 0.594 <br /> Benzene 8130199 0.200 ND <br /> Toluene 0.200 ND 0.166 60-0440 83.0 25.0 0.604 <br /> *enzene 0.200 ND 0.165 60.0-140 82.5 25.0 1.22 <br /> es(total) 0.600 ND 0.491 60.0-140 81.8 25.0 0.983 <br /> Methyl tert-butyl ether 0.200 ND 0.163 60.0-140 81.5 25.0 1.86 <br /> Surrogate: a,a,a-Trifluorotoluene 0.100 0.181 60.0-140 90.5 <br /> Batch: 9090004 Date Prepared: 911/22 <br /> ' E,..,..,,.t;,,.,HnPrhnrl; EPA 5034B fPITI <br /> RL=k 9020044-BLK1 50.0 <br /> Purgeable Hydrocarbons 911/99 ND ug/[ <br /> BND 0.500 <br /> Benzene <br /> ND 0.500 <br /> Toluene <br /> ND 0.500 <br /> Ethylbenzene <br /> ND 0.500 <br /> Xylenes(total) <br /> Methyl tert-butyl ether ND 5.00 <br /> Surrogate: a,a,a-Trifluorotoluene 10.0 5.49 60.0-140 84.9 <br /> L'-CS 212 II�1 70.0-130 87.8 <br /> Benzene 911/99 10.0 8.78 ug/l <br /> Toluene 10.0 8.81 70.0-130 88.1 <br /> Ethylbenzene 10.0 8.92 70.0-130 89.2 <br /> Xylenes(total) 30.0 26.7 70.0-130 89.0 <br /> Methyl tert-butyl ether 10.0 9.97 70.0-130 99.7 <br /> Surrogate: a,o,a-Trifluorotoluene 10.0 10.3 60.0-140 103 <br /> 90835 <br /> Benzene <br /> 911/9 10.0 pike / S D 8.65 ug/l 60.0-140 86.5 <br /> Toluene 10.0 ND 8.71 60.0-140 87.1 <br /> Ethylbenzene 10.0 ND 8.82 60.0-140 88.2 <br /> *Refer to end of report for text of notes and definitions. <br /> is Analytical-Sacramento <br /> Page 14 of 18 <br />