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Sequoia <br /> 819 Striker Avenue,Suite 8 <br /> Analytical Sacramento, 95834 <br /> (9]G)92 921-9600 <br /> FAX(916)921-0100 <br /> Emcon-Cameron Park <br /> Project: ARCO 2186,Stockton Sampled: 6/24/99 to 6/25/99 <br /> 3939 Cambridge Road,Ste.202 Project Number: N/A <br /> Cameron Park,CA 95682 Project Manager: Mark Capps Received: 6/25/99 <br /> Reported: 7/11/99 <br /> Total Purgeable Hydrocarbons(C6-C12),BTEX and MTBE by DHS LIFT/Quality,Control <br /> SequoiaAnalytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov. Limits % Limit <br /> /o Notes <br /> Blank(continued) 9070002-B1 Kl <br /> Surrogate: a,a,a-Tris luorotoluene 6/30/99 0.200 <br /> 0.178 mg/kg 60.0-140 89.0 <br /> ICS 9070002-RS] <br /> Benzene 6/30/99 0.200 <br /> Toluene 0.204 mg/kg 70.0-130 102 <br /> Ethylbenzene 0.200 0.220 70.0-130 110 <br /> Xylenes(total) 0.200 0.221 70.0-130 110 <br /> Methyl tert-butyl ether 0.600 0.591 70.0-130 98,5 <br /> Surrogate. a0.200 0.197 70.0-130 98.5 <br /> 0.200 <br /> 0.200 <br /> 0.178 60.0-140 89.0 <br /> Matrix Spike 9070002-M41 5906437-08 <br /> Benzene 6/30/99 0.200 <br /> Toluene ND 0.185 mg/kg 60.0-140 92.5 <br /> Ethylbenzene 0.200 ND 0.196 60.0-140 98.0 <br /> Xylenes(total) 0.600 ND 00.200 ND 0.200 60.0-140 100.544 ' <br /> Methyl tert-butyl ether 60.0-140 90.7 <br /> Surrogate: ¢,a,a-Trtiorotoluene 0.200 ND 0.184 60.0-140 92.00.200 <br /> 0.191 60.0-140 95.S <br /> Matrix Spikc Dun 9070002-MSDJ 5906437-08 <br /> Benzene Toluene 6/30/99 0.200 ND <br /> 0.200 ND 0.183 mg/kg 60.0-140 91.5 25.0 1.0'9 <br /> Ethylbenzene „ 0.186 60.0-140 93.0 25.0 5.24 <br /> Xylenes(total) 0.200 ND 0.198 60.0-140 99.0 25.0 1.01 <br /> Methyl tert-butyl ether 0.600 ND 0.542 60.0-140 90.3 25.0 0.442 <br /> Surrogate: a,aa-Tri,Jluorotolt�ene 0.200 ND 0.180 60.0-140 90.0 25.0 2.20 <br /> , 0.200 <br /> 0.188 60.0-140 94.0 <br /> Sequoia Analytical-Sacramento <br /> *Refer to end of report for text of notes and definitions. <br /> Page 12 of 16 <br />