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aci Sinker Ave Ste 8 <br /> Sequoia Sacramcnta,CA 95834 <br />' (916)921 9600 <br /> a— ) <br /> WAnalytical FAX(916)921-0100 <br /> �* www sequoialabs com <br /> estop Solutions Inc-Walnut Creek Project San Joaquin HSA 5306244 <br />' 1575 Treat Blvd,Ste 212 Project Number N/A Reported <br /> Walnut Creek CA,94596 Project Manager Jessica Levine 06/25/03 17 35 <br />' Gasoline(2-Methylpentane to 1,2,4-Trimethylbenzenle) and BTEX by EPA 8015M and 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 3060232-EPA 5030B(PIT} <br />' Laboratory Control Sample 3060232-BS2 Prepared&Analyzed 06/17/03 <br /> Benzene 9 56 050 U94 10 0 96 70-130 <br /> Toluene 9 89 050 100 99 70-130 <br /> Ethylbenzene 9 83 050 100 98 70-130 <br /> Xylenes(total) 294 0 50 " 300 98 70-130 <br /> Surrogate a a a-Trfluorotoluene 8111, 100 88 60-140 <br />' <br /> Laboratory Control Sample 3060232-BS3 Prepared&Analyzed 06/18/03 <br /> Benzene 9 51 0 50 u&4 10 0 95 70-130 <br />' Toluene 101 0 50 IO 0 101 70-130 <br /> Ethylbenzene 9 80 050 " 100 98 70-130 <br /> Xylenes(total) 294 050 300 98 70-130 <br />'Orrogare a,a,a-Trri luorotoluene 9 62 100 96 60-140 <br /> 6-03 Prepared&Analyzed 06/17/03 <br /> Matrix Spike 3060232-MSl Source 530616 .,. <br /> P ) <br /> Benzene 9 56 0 50 ugft 10 0 ND 96 60-140 <br /> Toluene 100 0 50 100 ND 100 60-140 <br />' Ethylbenzene 9 89 0 50 100 ND 99 60-140 <br /> Xylenes(total) 296 0 50 " 30 0 ND 99 60-140 <br /> Surrogate a a a-TTrafTuorotoluene 899 100 90 60-140 <br />' Matrix Spike Dup(3060232-MS_D1} _ Source S306166-03 Prepared&Analyzed 06/I7/03 _ <br /> Benzene 9 31 0 50 ug/I 100 ND 93 60-140 3 25 <br />' Toluene 9 83 0 50 n 10 0 ND 98 60-140 2 25 <br /> Ethylbenzene 9 63 0 50 10 0 ND 96 60-140 3 25 <br /> Xylenes(total) 287 0 50 30 0 ND 96 60-140 3 25 <br />' Surrogate a a a-Triuorotoluene 8 31 100 83 60-140 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wee weight-- <br /> basis This analytical report must he reproduced in its entirety <br /> Page 7 of 11 <br /> 1 <br />