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819 Striker A`e Ste 8 <br /> Sequoia 59ciamenlo CA 95834 <br /> (916)92 1 9600 <br /> I <br /> Analytical FAX(916)9210100 <br /> (& u"�k cequoialabs ,in <br />' Weston Solutions,Inc-Walnut Creek Project San Joaquin HSA S310130 <br /> 1575 Treat Blvd,Ste 212 Project Number 3rd Quarter Sampling Reported <br />' Walnut Creek CA,94596 Project Manager Jessica Levine 10/22/03 13 34 <br /> Gasoline (2-Methylpentane to 1,2,4-Trlmethylbenzene) and BTEX by EPA 8015M and 8021B - Quality Contr <br />' Sequoia Analytical- Sacramento <br /> Reporting Spike Source %RHC RPD <br /> Analyte Result Limit Units Let el Result %REC Linuts RPD Limit Notes <br />' Batch 3100076-EPA 5030B(PIT) <br /> Blank(3100076-BLK1) Prepared&Analyzed 10/06/03 <br /> Gasoline Range Organics ND 50 ugil <br /> Benzene ND 050 " <br /> Toluene ND 050 <br /> Ethylbenzene ND 050 <br /> t Xylenes(total) ND 050 <br /> Surrogale a a a-Trifluorotoluene 11 0 100 110 60-140 <br /> Blank(3100076-BLK2) Prepared&Analyzed 10/07/03 <br /> Gasoline Range Organics ND 50 ug/1 <br /> Benzene ND 050 <br /> Toluene ND 050 <br /> Ethylbenzene ND 050 <br /> Xylenes(total) ND 050 ' <br /> urrogate a a a-Trifluorotoluene 108 100 108 60 140 <br /> Laboratory Control Sample(3100076-BSI) Prepared&Analyzed 10106!03 <br />' Benzene 837 050 ug/1 100 84 70 130 <br /> Toluene 892 0 50 10 0 89 70-130 <br /> Ethylbenzene 982 050 100 98 70-130 <br />' Xylenes(rota[) 267 050 300 89 70-130 <br /> Surrogate a a a Tri luorotoluene 10 7 100 107 60-140 <br /> Laboratory Control Sample(3100076-BS2) Prepared&Analyzed 10/07/03 <br />' Benzene 976 050 ug/1 100 98 70-130 <br /> Toluene 10 1 050 10 0 101 70 130 <br /> Ethylbenzene 10 4 050 10 0 104 70-130 <br /> Xylenes(total) 286 050 300 95 70-130 <br />' Surrogate aaa-Tri luorololuene 11 9 100 119 60-140 <br /> 1 <br /> Sequoia Analytical -Sacramento The results in thus report apply to the samphs analyzed in accordance n tth 1he chain of <br /> rustodi document Unless othernise sttncd results rite reported on a>t et weight basis <br /> 0 This analytical report rnusl be reproduced in its entu e h <br />' Page 4 of 6 <br />