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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 (925)988-%00 FAX(925)988-9673 <br /> Analytical 819 Straker Avenue Suite 8 Sacramento CA 95834 `916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 707 79Z-1865 FAX(707)79Z-0342 <br />'ATC Associates,Inc Project Ripon USD Sampled 2/5199 <br /> 1 l 17 Lone Palm Ave,Suite B Project Number 13099 0001 Received 2110199 <br />' Modesto,CA 95351 Project Manager Drew Van Allen Reported 2/25/99 <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 9020431 Date Prepared 211.9199 Extraction Method EPA 5030 waters <br /> Blank 9020431-BLK1 <br /> Gasoline 2/19/99 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 /> Surrogate a a a-Trifluorotoluene 300 323 108 <br /> Surrogate 4-Bromofluorobenzene 300 297 990 <br /> LCS 9020431-BSI <br /> 'Gasoline 2119199 1000 866 ug/1 866 <br /> Surrogate 4-Bromofluorobenzene 300 292 973 <br /> 0=1 <br /> rix 5 Ike 9020431-MSS P902194-01 <br /> lme 2/19/99 1000 ND 890 ug/l 890 <br /> Surrogate 4-Bromofluorobenzene 11300 287 95 7 <br /> ' Matrix Spike Duli 9020431-MSD1 P902194-01 <br /> Gasoline 2/19/99 1000 ND 878 ug/l 878 136 <br /> Surrogate 4-Bromofluorobenzene 300 299 997 <br /> 1 <br /> 1 <br /> ' Sequoia Analytical -Petaluma *Refer to end of report for text of notes and definitions <br /> Page 5 of 9 <br />