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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 {707)792-1865 FAX(707)792-0342 <br /> ]551 Industrial Road San Carlos CA 94070-41 11 (650)232 9600 FAX(650)232-9612 <br /> SECOR International Project ARCO 2133,Stockton,CA Sampled 3/15/99 <br /> 9912 Business Park Drive,Ste 100 Project Number 7G600-079-04 Received 3/16/99 <br /> Sacramento,CA 95827 Project Manager Rusty Benkosky Reported 4/1/99 <br /> Total Purgeable Hydrocarbons(C6-C12),BTEX and MTBE 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 /> Matrix SpiWcgo ied) 9030317-MSI 5903219-11 <br /> Xylenes(total) 3/23/99 0 600 ND 0 521 mg/kg 600-140 868 <br /> Methyl tert-butyl ether 0200 ND 0 146 600-140 730 <br /> Surrogate a a a-Trifluorotoluene 0200 0203 600-140 101 <br /> Matrix Spike Dup 9039317-MSDI S903219-11 <br /> Benzene 3/23/99 0200 ND 0 176 mg/kg 600-140 88 0 25 0 230 <br /> Toluene 0200 ND 0 178 600-140 89 0 25 0 331 <br /> Ethylbenzene 0200 ND 0 193 600-140 965 25 0 262 <br /> Xylenes(total) 0 600 ND 0 533 600-140 88 8 25 0 228 <br /> Methyl tert-butyl ether 0200 ND 0 157 600-140 78 5 25 0 726 <br /> Surrogate a a a-Trifluorotoluene 0200 0205 600-140 102 <br /> Batch, 9030375 nate Prepared, 3129/99 Extraction Method, EPA 5030B(P/T) <br /> 9030375-11/X I <br /> Wcable Hydrocarbons 3/30/99 ND ug/l 500 <br /> e"ene ND 0 500 <br /> Toluene ND 0 500 <br /> Ethylbenzene ND 0 500 <br /> Xylenes(total) ND 0 500 <br /> Methyl tert-butyl ether ND 500 <br /> Surrogate a a a-Trifluorotoluene 100 100 600-140 100 <br /> LCS 9030375-BS1 <br /> Benzene 3/30/99 100 907 ug/1 700-130 907 <br /> Toluene 100 8 98 700-130 898 <br /> Ethylbenzene l0 0 892 700-130 89 2 <br /> Xylenes(total) 300 26 8 700-130 89 3 <br /> Methyl tert-butyl ether I 0 0 13 0 700-130 130 <br /> Surrogate a a a-Trifluorotoluene 100 /01 600-140 101 <br /> Matrix Spike 9030375-MS1 5903290-05 <br /> Benzene 3/30/99 too ND 9 12 ug/1 600-140 91 2 <br /> Toluene 10 0 ND 8 93 600-140 893 <br /> Ethylbenzene 100 ND 8 93 600-140 893 <br /> Xylenes(total) 300 ND 26 7 600-140 890 <br /> Methyl tert-butyl ether 100 ND 12 8 600-140 128 <br /> Surrogate a a a-Trifluorotoluene 100 949 600-140 94 9 <br /> Matrix Spike Duu 9030375-MSDI 5903290-05 <br /> Benzene 3130/99 100 ND 9 19 ug/1 600-140 91 9 25 0 0 765 <br /> WoiTucne 100 ND 900 600-140 900 25 0 0781 <br /> a Analytical - Sacramento *Refer to end of report for text of notes and definitions <br /> Sandra R Hanson,Client Services Representative Page 18 of 22 <br />