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404 N WigetLane <br /> Sequoia Walnut Creek CA <br /> 94598 <br /> (925)988-9600-9600 <br /> FAX(925)988-9673 <br /> Analytical wwwsequoialabs com <br /> Gettler Rydn Inc -Dublin Project Tosco <br /> 6747 Sierra Court Suite i Project Number Tosco h 6981 Reported <br /> Dublin CA,94568 Project Manager Stott Polston 15-Dec-00 15 21 <br /> Total Purgeable Hydrocarbons (C6-C12), BTEX and MTBE by DHS LUFT- Quality Control <br /> Sequoia Analytical -Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch OK30003 -EPA 5030B [PIT] <br /> Blank(OK30003-BLKI) Prepared&Analyzed 29-Nov-00 <br /> Purgeable Hydrocarbons ND 10 mg/ml Air <br /> Benzene ND 010 <br /> Toluene ND 010 " <br /> i <br /> Ethvlbenzene ND 010 <br /> Xylenes(total) ND 0 10 <br /> Methyl tert-butyl ether ND 0 50 " <br /> Surrogate a a a-Trfuorotoluene 546 600 91 0 70-130 <br /> Blank(OK30003-BLK4) Prepared&Analvzed 02-Dec-00 <br /> Purgeable Hydrocarbons ND 10 mg/ml Air <br /> Benzene ND 010 " <br /> ne ND 0 10 <br /> benzene ND 010 <br /> Xylenes(totai) ND 0 10 " <br /> Methyl tert-butvl ether ND 0 50 <br /> Surrogate a a a Trtt luorotoluene 5 72 600 95 3 70-130 <br /> Blank(OK30003-BLK5) Prepared&Analvzed 03-Dec-00 <br /> Purgeable Hydrocarbons ND 10 mg/ml Air <br /> Benzene ND 010 <br /> Toluene ND 010 <br /> Ethylbenzene ND 0 10 <br /> Xylenes(total) ND 0 10 " <br /> Methyl tent-hutvl ether ND 050 <br /> Surrogate a a a Triuoroioluene 556 600 92 7 70-130 <br /> LCS(OK30003-BSI) Prepared&Analvzed 29-Nov-00 <br /> Benzene 202 0 10 mg/ml Air 200 101 70-130 <br /> Toluene 199 0 10 2 00 995 70-130 <br /> Ethylbenzene 193 0 10 200 965 70-130 <br /> Nylenes(total) 564 0 10 600 940 70 130 <br /> Surrogate a a a-Tnfluorotoluene 4 68 600 780 70-130 <br /> ata Analytical-Walnut Creek The results to this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 4 of 6 <br />