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819 Striker Ave Ste 8 <br /> Sequoia Sacramento,CA 95834 <br /> Analytical FAX(916(916))9921A600 <br /> www sequotalabs torr <br /> Weston Solutions Inc-Walnut Creek Project San 7oaqum HSA S406583 <br /> 1575 Treat Blvd,Ste 212 Project Number NIA Reported <br /> ' Walnut Creek CA,94596 Project Manager Greg Bemer Menna 07/12/04 12 04 <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 Limit Notes <br /> Batch 4070017-EPA 50303 P/T <br /> Blank(4070017-BLKI) Prepared&Analyzed 07/01/04 <br /> Gasoline Range Organics(C4 C12) ND 50 ug/l <br /> ' Benzene ND 0 50 <br /> Toluene ND 0 50 <br /> Ethylbenzene ND 0 50 <br /> ' Xylenes(total) ND 050 % <br /> Surrogate a a a-Trifluorotoluene 9 89 100 99 60-140 <br /> Blank(4070017-BLK2) _ Prepared&Analyzed 07/02/04 <br /> Gasoline Range Organics(C4 C12) ND 50 ug/l <br /> Benzene ND 050 <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 050 " <br /> ylenes(total) ND 0 50 " <br /> Surrogate a a a-Trifluorotoluene 10 1 " 100 101 60-140 <br /> Laboratory Control Sample(4070017-BSI) Prepared&Analyzed 07/01/04 <br /> Benzene 9 86 0 50 ug/l 100 99 70-130 <br /> Toluene 101 050 100 101 70-130 <br /> Ethylbenzene 10 I 050 100 101 70-130 <br /> ' Xylenes(total) 29 4 050 30 0 99 70-130 <br /> Surrogate a a a-Trifluorotoluene 9 75 100 98 60-140 <br /> Laboratory Control Sample(4070017-BS2) Prepared&Analyzed 07/02/04 <br /> ' Benzene 102 050 ug/l 10 0 102 70-130 <br /> Toluene 10 4 0 50 10 0 104 70-130 <br /> Ethylbenzene 10 1 0 50 10 0 101 70-130 <br /> ' Xylenes(total) 29 2 0 50 300 97 70-130 <br /> Surrogate a a a-Trifluorotoluene 10 1 100 101 60-140 <br /> ' Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed to accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 6 of 8 <br />