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' 819 Striker A%a Ste 8 <br /> Sequoia Sacramento CA 95834 <br /> (916)921 9600 <br /> Analytical (916)921 01o0 <br /> www seq sequoialaLs com <br />' Weston Solutions,Inc-Walnut Creek Project San Joaquin HSA S401313 <br /> 1575 Treat Blvd,Ste 212 Project Number 4th Quarter Sampling Reported <br />' Walnut Creek CA,94596 Project Manager Jessica Levine 01/28/04 13 41 <br /> Purgeable Hydrocarbons and BTEX by EPA 8015B/8021B - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> JAnalyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />' Batch 4010202-EPA 5030E(PIT) <br /> Matrix Spike(4010202-MS1) Source S401313-01 Prepared&Analyzed 01/19/04 <br /> Benzene 12 6 050 ug/1 100 ND 126 60-140 <br />' Toluene 12 4 050 100 029 121 60-140 <br /> Ethylbenzene 12 3 050 100 ND 123 60-140 <br /> Xylenes(total) 368 050 300 ND 123 60-140 <br /> Surrogate a a a-Tris luorotoluene 12 2 IOU 122 60-140 <br /> Matnx Spike Dup(4010202-MSDI) Source S401313-01 Prepared&Analyzed 01/19/04 <br /> Benzene 1 1 2 050 ug/1 100 ND 112 60-140 12 25 <br /> Toluene 10 9 050 100 029 106 60-140 13 25 <br />' Ethylbenzene 10 7 050 " too ND 107 60-140 14 25 <br /> Xylenes(total) 32 3 050 300 ND 108 60-140 13 25 <br /> Surrogate a a a-Trac luorotoluene 109 IOU 109 60 140 <br /> 1 <br /> ' Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 8ofl0 <br />