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Sequoia 6800sapeake Drive Redwood City CA 94t* (650) 364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)988-9673 <br /> ri C � 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916 )921 -0100 <br /> nalyti1455 McDowell Blvd North Ste D Petaluma,CA 94954 707 792-1865 FAX 707 792-0342 <br /> me Technical Services,Inc Project Shell Oil Co Sampled 12/29/98 <br /> 1680 Rogers Ave Project Number 341 East Main-Ripon Received 12/31/98 <br /> San Jose,CA 95112 Project Manager Fran Thie Reported 1/15/99 <br /> Total Petroleum Hydrocarbons as Gasoline and BTEX by EPA 8015M/8020M/Quality Control <br /> Sequoia Analytical-Petaluma <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> Batch 9010084 Date Prepared 116199 Extraction Method EPA 5030 waters <br /> Blank 9010084-BLK1 <br /> Gasoline 1/6/99 ND ug/l 500 <br /> Benzene 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 200 <br /> Surrogate a a,a-Triuorotoluene 300 287 650-135 957 <br /> Surrogate 4-Bromofluorobenzene 300 304 650-135 101 <br /> Blank 9010084-BLK2 <br /> Gasoline 1/7/99 ND ug/l 500 <br /> Benzene ND 0 500 <br /> Toluene ND 0 500 <br /> Ethylbenzene ND 0 500 <br /> 0 lenes(total) ND 0 500 <br /> thyl tert-butyl ether ND 200 <br /> Surrogate a,a,a-Trifluorotoluene 300 304 650-135 101 <br /> Surrogate 4-Bromofluorobenzene 300 337 650-135 112 <br /> LCS 9010084-BSI <br /> Gasoline 1/6/99 1000 1020 ug/l 650-135 102 <br /> Surrogate 4-Bromofluorobenzene ry 300 297 650-135 990 <br /> LCS 9010084-BS2 <br /> Gasoline 1/7/99 1000 1080 u9/1 650-135 108 <br /> Surrogate 4-Bromofluorobenzene of 300 325 F1 650-135 108 <br /> Matrix Spike 9010084-MS1 P812418-01 <br /> Gasoline 1/6/99 1000 ND 978 ug/I 650-135 978 <br /> Surrogate 4-Bromofluorobenzene of 300 319 " 650-135 106 <br /> Matrix Spike Dup 9010084-MSD1 P812418-01 <br /> Gasoline 1/6/99 1000 ND 987 ug/l 650-135 987 200 0 916 <br /> Surrogate 4-Bromofluorobenzene 300 313 it 650-135 104 <br /> I <br /> uoia Analytical-Petaluma *Refer to end of report for text of nates and definitions <br /> Page 4 of 7 <br />