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Sequoia 1551 Industrial Road <br /> San Carlos CA 94070 <br /> Analytical (650)232-9600 <br /> FAX(650)232 461212 <br /> � <br /> www sequoialabs corn ` <br /> Gettler-Ryan/Geostrateizies(1) Project Tosco(1) <br /> 6747 Sierra Court,Suite 7 Project Number Unocal SS#08671,Stockton,CA Re <br /> Dublin CA,94568 Project Manager Deanna Harding 02/28.':/0211:15: <br /> Total Purgeable Hydrocarbons (C6-C12), BTEX and MTBE by DHS LUFT- Quality Control <br /> - - - Sequoia Analytical -Walnut Creek- <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2B20001 -EPA 5030B P/T <br /> Blank(2B20001-BLKI) _ Prepared&Analyzed 02/20/02 <br /> Purgeable Hydrocarbons(C6-C12) ND 50 ug/l <br /> Benzene ND 050 " <br /> Toluene NO 050 " <br /> Ethylbenzene NO 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tent-butyl ether(MTBE) ND 2 5 <br /> Surrogate a,a,a-Trtfluorotoluene 334 300 111 70-130 <br /> 2B20001-BLK2 <br /> Blank p Analyzed 02/21/02 <br /> _ ( ) Pre ared&-- <br /> Purgeable Hydrocarbons(C6-C12) NO 50 ug/t <br /> Benzene - NO 0 50 <br /> Toluene ND 0 50 <br /> Ethylbenzene NO 050 " <br /> Xylenes(total) ND 050 <br /> Methyl tert-butyl ether(MTBE) NO 2 5 " <br /> Surrogate a a a-Trifluorotoluene 371 300 124 70-130 <br /> Blank..(2B20001-BLK3) - Prepared&Analyzed 02_/20/02 _ <br /> Purgeable Hydrocarbons(C6-C12) NO 50ug/1__ <br /> — — <br /> Benzene T NO 0 50 <br />_Toluene=— ------- --ND--- —0 50- —"- — - - -- — ---- -- - - - - - -- <br /> Ethylbenzene NO 0 50 " <br />--Xylenes(total)-- = — ----- ---ND- —ND - - = 0 50 - - "---- -- -- - ---z -- -- -- -- - --- - <br /> Methyl tert-butyl ether(MTBE) ND 2 5 " <br /> Surrogate a,a,a-Trifluorotoluene 31 6 300 105 70-130 <br /> Blank(2B20001-BLK4) Prepared&Anal_yzed 02_/_22/02 <br /> Purgeable Hydrocarbons(C6-C12) ND 50 ug/l <br /> Benzene ND 0 50 " <br /> Toluene ND 0 50 <br /> Ethylbenzene NO 050 " <br /> Xylenes(total) ND 0 50 " <br /> Methyl tert-butyl ether(MTBE) NO 2 5 " <br /> Suirogate a,a,a-Trtflumotoluene 361 300 121 70-130 <br /> Sequoia Analytical -San Carlos The i esults in this repo[t apply to the samples analyzed in accordance with the c <br /> of custody document This analytical i epor t must be reproduced in its entirety <br /> Page 13 of 16 <br />