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885 Jarvis Dr <br /> 4DSequoia Morgan Hill,CA 95037 <br /> l.i c a (448)776-9600 <br /> 1w Analytical <br /> FAX(408}782-6308 <br /> www sequoialabs can <br /> Stratus Environmental Inc Project ARCO#2130 MLL0778 <br /> 3330 Cameron Park Dr,Suite 550 Project Number ARCO#2130,Stockton,CA Reported <br /> Cameron Park CA,95682 Project Manager Jay Johnson 01/08/03 1149 <br /> Total Purgeable Hydrocarbons and BTEX by DHS LUFr- 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 2120503-EPA 5030B <br /> Blank(2120503-BLK1) Prepared&Analyzed 12/30/02 <br /> Purgeable Hydrocarbons ND 50 ug/1 <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethyikm=e ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate a a a-Tr fluorotoluene 106 100 106 60-140 <br /> Blank(2120503-BLK2) Prepared&Analyzed 12/31/02 <br /> Purgeable Hydrocarbons ND 50 ug/1 <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Wylbenzene ND 050lenes(total) ND 050 " <br /> Surrogate a a a-Tr+i lucrotoluene 106 100 106 60-140 <br /> Laboratory Control Sample(2120503-B51) Prepared 12/30/02 Analyzed 12/31/02 <br /> Benzene 105 0 50 ugll 100 105 70-130 <br /> Toluene 100 0 50 100 100 70-130 <br /> Ethylbenzene 9 55 0 50 100 96 70-130 <br /> Xylenes(total) 29 1 050 300 97 70-130 <br /> Surrogate a a a-Tr+fhiorotoluene 105 100 105 60-140 <br /> Laboratory Control Sample(2124503-BS2) Prepared&Analyzed 12/31/02 <br /> Benzene 106 050 ugll 100 106 70-130 <br /> Toluene 10 3 050 100 103 70-130 <br /> Ethylbcazene 110 050 100 110 70-130 <br /> Xylenes(total) 327 050 300 109 70-130 <br /> Surrogate a aa-TriJluorololuene 108 100 108 60-140 <br /> Sequoia Analytical-Morgan Hill 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 /> Thu analytical report must be reproduced in its entirely <br /> Page 7 of 11 <br />