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819 Striker Avenue,Suite 8 <br /> Sacramento, 95834 <br /> Sequoia (916})921-9600 <br /> Analytical FAX(916)92 1-0 100 <br /> www sequoialabs win <br /> elta Environmental Consultants(Cameron Park) Project ARCO 2168,Stockton,CA <br /> 0 Cameron Park Dr Ste 550 Project Number 2168,Stockton,CA Reported <br /> Cameron Park CA,95682 Project Manager Steve Carter 04/17/02 09 40 <br /> Total Purgeable Hydrocarbons and BTEX by DHS LUFT - Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Resutt Ltmlt Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2020325-EPA 5030B P/T <br /> Blank 2020325-BLK1 Prepared&Analyzed 02/25/02 <br /> Purgeable Hydrocarbons ND 50 ug/1 <br /> Benzene ND 0 50 " <br /> Toluene ND 0 50 <br /> Ethylbenzene ND 0 50 " <br /> Xylenes (total) ND 0 50 " <br /> Surrogate a a a-Tnfluorotoluene 109 100 109 60-140 <br /> LCS(2020325-BSI) Prepared&Analyzed 02/25/02 <br /> Benzene 9 91 0 50 ug/1 10 0 99 1 70-130 <br /> Toluene 10 2 0 50 100 102 70-130 <br /> Ethylbenzene 103 0 50 100 103 70-130 <br /> Xylenes(total) 29 5 0 50 300 98 3 70-130 <br /> Surrogate a a a-Tnfluorotoluene 104 100 104 60-140 <br /> Du 2020325-BSD1 Prepared&Analyzed 02/25/02 <br /> Benzene 10 3 0 50 ug/l 100 103 70-130 3 86 25 <br /> Toluene 107 0 50 10 0 107 70-130 4 78 25 <br /> Ethylbenzene 107 0 50 100 107 70-130 3 81 25 <br /> Xylenes(total) 31 6 0 50 300 105 70-130 6 87 25 <br /> Surrogate a a a-Trifluorotoluene 9 91 100 99 1 60-140 <br /> Batch 2030003-EPA 5030B P/T <br /> Blank(2030003-BLK1) Prepared 02/27/02 Analyzed 02/28/02 <br /> Purgeable Hydrocarbons ND 50 ug/l <br /> Benzene ND 050 " <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 0 50 " <br /> Xylenes(total) ND 0 50 " <br /> Surrogate a s a-Tnfluorotoluene 766 100 76 6 60-140 <br /> �uota Analytical- Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document This analytical report must be reproduced in its entirety <br /> Page Page 9 of 15 <br />