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Sequoia819 Stnker A%e Ste 8 <br /> Sacramento CA 95834 <br /> I Analytical (916)921 9600 <br /> FAX(9l 6)921 0100 <br /> www sequoialabs con <br /> IWeston Solutions Inc-Walnut Creek Project San Joaquin HSA 5404035 <br /> 1575 Treat Blvd,Ste 212 Project Number 1st Quater 2004 Reported <br /> IWalnut Creek CA,94596 Project Manager Jessica Levine 04/15/04 13 07 <br /> Purgeable Hydrocarbons and BTEX by EPA 8015B/8021B-Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Ltmrt Notes <br /> IBatch 4040025-EPA 5030B(PIT) <br /> Laboratory Control Sample(4040.025_BS4) Prepared&Analyzed 04/07/04 <br /> Benzene 961 050 u9/1 100 96 70-130 <br /> Toluene10 2 050 10 0 102 70-130 <br /> Ethylbenzene 110 6 0 50 11 10 0 106 70 130 <br /> Xylenes(total) 31 0 0 50 300 103 70 130 <br /> I Laboratory Control Sample{4040025-BSS,} 1 0 106 60-140 <br /> Surrogate a a a-Trrfluorotoluene 10 6 <br /> ._ .,.._. ...,,,,....,_.. ._ Prepared&Analyzed 04/08/04 _ <br /> Benzene 9 26 0 50 ug/l loo 93 70-130 <br /> Toluene 9 52 0 50 " 100 95 70 130 <br /> Ethylbenzene 10 0 050 10 0 100 70 130 <br /> Xylenes(total) 28 6 0 50 30 0 95 70 130 <br /> ISwrogate a a a-Trrfluorowluene 11 3 100 111 60-140 <br /> Aftm-triic Spike(4040025-MSI) Sourle S404023-01 Prepared&Analyzed 04/02/04 <br /> Benzene 10 1 050 ug/I 100 ND 101 60 140 <br /> Toluene 10 3 0 50 100 ND 103 60-140 <br /> I Ethylbenzene 10 6 0 50 i 10 0 ND 106 60-140 <br /> Xylenes(total) 31 4 0 50 30 0 ND 105 60 140 <br /> Srurogate a a a Tr fluorototuene I1 3 1 p 0 113 60 140 <br /> Matrix Spike Dup(4040025-MSDI) Source 5404023-01 Prepared&„Analyzed 04/02/04 _ <br /> Benzene 11 7 0 50 ug/l loo ND 117 60-140 15 25 <br /> Toluene 11 9 050 10 0 ND 119 60-140 14 25 <br /> Fthylbenzene 12 2 0 50 10 0 ND 122 60 140 14 25 <br /> Xylenes(total) 36 7 050 300 ND 122 60 140 16 25 <br /> Surrogate a a a-Trifluorotoluene 104 10 U 104 60-140 <br /> I <br /> I <br /> I <br /> Sequoia Analytical-Sacramento The results in this report apply to the samptes analyzed in accordance nrth the chain <br /> of custodv document Unless otherwise staled i esults are reported on a stet weight <br /> basis This anal)tical report must be reproduced in its enirreh <br /> IPage 6 of 7 <br /> I <br />