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Sequoia <br /> 819 Striker Avenue,Suite 8 <br /> Analytical Sacramento, 95834 <br /> (91 G)92 921-9600 <br /> FAX (916)921-0100 <br /> Emcon-Cameron Park <br /> Project: ARCO 2186,Stockton <br /> 3939 Cambridge Road,Ste.202 Sampled: 6/24/1=6/21/99 <br /> Cameron Park,CA 95682 Project Number: N/A <br /> Project Manager: Mark CappsReceived: 6/25/9Reported: 7/11/9 <br /> Total Purgeable Hydrocarbons(6-C12),BTEX:and4ME by DHS LUFT/QualityControl <br /> Sequoia Analytical-'Sacramento <br /> Date Spike Sample <br /> Analyte QC Reporting Limit Recov. RPD RPD <br /> Analyzed Level Result Result Units Recov. Limits % Limit * <br /> /o Notes <br /> Batch: 90604 Date Prepared• 6/29/99 <br /> lanit Extraction Method' FPA 5030]3(MeOij) <br /> 906042 -B .Kt <br /> Purgeable Hydrocarbons 6/29/99 <br /> Benzene ND mg/kg 1.00 <br /> Toluene ND 0.00500 <br /> Ethylbenzene ND 0.00500 <br /> Xylenes(total) „ ND 0.00500 <br /> Methyl tent-butyl ether ND 0.00500 <br /> Surrogate: a,a,a-Trifluorotoluene ND 0.0500 <br /> 0.200 0.180 60.0-140 90.0 <br /> ICS 9060425-BSI <br /> Benzene <br /> Toluene 6/29/99 0.200 <br /> 0.209 mg/kg 70.0-130 105 <br /> Ethylbenzene 0.200 0.226 70.0-130 113 <br /> Xylenes(total) 0.200 0.227 70.0-130 113 <br /> Methyl tert-butyl ether 0.600 0.606 70.0-130 101 <br /> Surrogate:. a,a,a-Triuorotoluene 0.200 0.202 70.0-130 101 <br /> 0.200 0.17660.0-140 88.0 <br /> Matrix Spike M0425-MSI <br /> Benzene ---�-i S906401-01 <br /> 6/29/99 0.200 <br /> Toluene ND 0.188 mg/kg 60.0-140 94.0 <br /> 0.200 <br /> Ethylbenzene ND 0.201 60.0-140 101 <br /> Xylenes(total) 0.200 ND 0.201 60.0-140 101 <br /> Methyl tert-butyl ether 0.600 ND 0.547 60.0-140 91.2 <br /> Surrogate: a,a,a-Triuorotoluene 0.200 ND 0.190 60.0-140 95.0 <br /> 0.200 0.180 60.0-140 90.0 <br /> Matrix ik D Lp 906042 -060425 <br /> Benzene ----�-- 5906401-01 <br /> 6/29/99 0.200 <br /> Toluene 1. 0.192 0.192 mg/kg 60.0-140 96.0 25.0 2.11 <br /> 0.200 <br /> Ethylbenzene ND 0.194 60.0-140 97.0 25.0 4.04 <br /> Xylenes(total) 0.200 ND 0.205 60.0-140 102 25.0 0.985 <br /> Methyl tert-butyl ether 0.600 ND 0.558 60.0-140 93.0 25.0 1.95 <br /> Surrogate: a,a,a-Triuorotoluene 0.200 ND 0.193 60.0-140 96.5 25.0 1.57 <br /> 0.200 0.184 60.0-140 92.0 <br /> Batch: 9070002 Date Prepared:-6/30/99 <br /> Blank 2070002-131,11(1Extraction Method PA 5030$ MRO ,) <br /> Purgeable Hydrocarbons 6/30/99 <br /> Benzene „ ND mg/kg 1.00 <br /> Toluene „ ND 0.00500 <br /> Ethylbenzene ND 0.00500 <br /> Xylenes(total) ND 0.00500 <br /> Methyl tert-butyl ether ND 0.00500 <br /> ND 0.0500 <br /> Sequoia Analytical-Sacramento <br /> *Refer to end of report for text of notes and de/. rations. <br /> Page I 1 of 16 <br />