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680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> V(D— Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Secor International Project Circle K, Stockton,CA Sampled 5/18/98 <br /> 9912 Business Park Drive, Ste 100 Project Number N/A Received 5/18/98 <br /> Sacramento,CA 95827 Project Manager Rusty Benkosky Reported 5/19/98 <br /> Total Purgeable Hydrocarbons(C6-02),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 /> Batch_805QJ87Extraction Method. EFA 5030B(MeOH) <br /> Blank 8050187-BLKI <br /> Purgeable Hydrocarbons 5/18/98 ND mg/kg 100 <br /> Benzene ND 000500 <br /> Toluene ND 000500 <br /> Ethylbenzene ND 000500 <br /> Xylenes(total) ND 000500 <br /> Methyl Cert-butyl ether ND 00500 <br /> Surrogate a a a-Trifluorotoluene 0200 0 214 600-140 107 <br /> LCS 8050187-BSI <br /> Benzene 5/18/98 0200 0 225 mg/kg 700-130 112 <br /> Toluene 0200 0204 700-130 102 <br /> Ethylbenzene 0200 0204 700-130 102 <br /> Xylenes(total) 0 600 0 603 700-130 100 <br />�Iethyl Cert-butyl ether 0200 0 227 700-130 113 <br /> Surrogate a a a-Trifluorotoluene 0200 0 215 600-140 108 <br /> Matrix Spike 8050187-MSI S805073-01 <br /> Benzene 5118/98 0200 ND 0 212 mg/kg 600-140 106 <br /> Toluene 0200 ND 0 191 600-140 955 <br /> Ethylbenzene 0200 ND 0 196 600-140 980 <br /> Xylenes(total) 0 600 ND 0 583 600-140 972 <br /> Methyl tert-butyl ether 0200 ND 0 218 600-140 109 <br /> Surrogate a,a,a-Trtfluorotoluene 0200 0 223 600-140 112 <br /> Matrix Spike Dun 8050187-MSDD1 5505913-01 <br /> Benzene 5/18/98 0200 ND 0209 mg/kg 600-140 105 25 0 0 948 <br /> Toluene 0200 ND 0 193 600-140 965 25 0 104 <br /> Ethylbenzene 0200 ND 0 193 600-140 965 25 0 154 <br /> Xylenes(total) 0 600 ND 0 576 600-140 960 25 0 124 <br /> Methyl tert-butyl ether 0200 ND 0 212 600-140 106 25 0 279 <br /> Surrogate a a a-Trifluorololuene 0200 0 216 600-140 108 <br /> equola An tical'Sacramento <br /> *Refer to end of report for text of notes and definitions <br /> nda C Schneider, aboratory Director Page 3 of 4 <br /> r�i <br />