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680 Chesapeake Drive Redwood Gty CA 94063 (650)364-96600 FAX(650)364-9233 <br /> Sequoia 404 N Wiget lane Walnut Geek CA 94598 (9251988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)9ZI-%W FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd Nath Ste D Petaluma CA 94954 (797)79Z-1865 FAX(707)79Z-0342 <br /> 1551 Industrial Road San Carlos CA 94070-4111 (650)232-9600 FAX(650)Z32-9612 <br /> SECOR International Project Chevron 9-6258,Stockton,CA Sampled 416/99 to 4/7/99 <br /> 9912 Business Park Drive,Ste 100 Project Number 7GO07-018-01 Received 418/99 <br /> Sacramento,CA 95827 Project Manager Roger Hoffmore Reported 4/22/99 <br /> Volatile Organic Compounds by EPA Method 8010B/Qualtty 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 Spike 2040243-MS1 S904159-05 <br /> Chlorobenzene 4/20/99 400 ND 304 ug/kg 600-140 760 <br /> 1,I-Dichloroethane 200 ND 146 600-140 730 <br /> Trichloroethene 200 ND 166 600-140 830 <br /> Surrogate Bromochloromethane 100 138 600-140 690 <br /> Surrogate 2-Chlorotoluene 200 226 600-140 113 <br /> Matrix Spike Duo 9040241-MSI2.1 S904159-05 <br /> Chlorobenzene 4/20/99 400 ND 378 ug/kg 600-140 945 25 0 217 <br /> 1,1-Dichloroethane 200 ND 164 600-140 820 250 116 <br /> Trichloroethene 200 ND 222 600-140 111 250 289 4 <br /> Surrogate Bromochloromethane 200 232 600-140 116 <br /> Surrogate 2-Chlorotoluene 200 234 600-140 117 <br /> Batch- 9040261 Date Prepared. 4121199 Extraction Method, EPA 5030B(MeO111 <br /> MUIR 4940261--RIXI <br /> romodichloromethane 4/21/99 ND ug/kg 500 <br /> Bromoform ND 500 <br /> Bromomethane ND 10 0 <br /> Carbon tetrachloride ND 500 <br /> Chlorobenzene ND 500 <br /> Chloroethane ND 100 <br /> 2-Chloroethylvinyl ether ND too <br /> Chloroform ND Soo <br /> Chloromethane NL too <br /> Dibromochloromethane ND Soo <br /> 1,3-Dichlorobenzene ND Soo <br /> 1,4-Dichlorobenzene ND 500 <br /> 1,2-Dichlorobenzene ND 500 <br /> 1,1-Dichloroethane ND 500 <br /> 1,2-Dichloroethane ND " 500 <br /> 1,1-Dichloroethene ND 500 <br /> cis-1,2-Dichloroethene ND 500 <br /> trans-1,2-Dichloroethene ND 500 <br /> 1,2-Dichloropropane ND 500 <br /> cis-1,3-Dichloropropene ND 500 <br /> trans-1,3-Dichloropropene ND 500 <br /> Methylene chloride ND Soo <br /> 1,1,2,2-Tetrachloroethane ND Soo <br /> Tetrachloroethene ND 500 <br /> 1,I,1-Trichloroethane ND 500 <br /> 1WL-,A,o,a <br /> 1,2-Trichloroethane ND 500 <br /> Analytical-Sacramento 'Refer to ena of report for text ofnotes a d definitions <br /> a�� <br /> Page 20 of 23 <br /> Sandra R Hanson,Client Services Representative <br />