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819 Striker Avenue Suite 8 <br /> Sequoia Sacramento c9 <br /> (9 16)9221-960096M <br /> 4 <br /> a- ) <br /> FAX(916)921-0 100 <br /> Analytical www sequoialabs corn <br /> wr <br /> SECOR International- Rancho Cordova Project ARCO 2093,Tracy,CA <br /> 3017 Kilgore Road,Suite 100 Project Number N/A Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 04/11/01 18 40 <br /> Total Purgcable Hydrocarbons (C6-C12) and BTEX by DHS LUFT - 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 1040008- EPA 5030B(PIT) <br /> Blank(104_0_008-BLKI) Prepared&Analyzed 03/30/01 _T <br /> Purgeable Hydrocarbons ND 500 ug/l <br /> Benzene ND 0 500 " <br /> Toluene ND 0 500 " <br /> Ethylbenzene ND 0 500 " <br /> Xylenes(total) ND 0 500 <br /> Surrogate a a a-Trzj7uorotoluene 882 100 88 2 60-140 <br /> L.CS(1040008-BSI) Prepared&Analyzed 03/30/01 <br /> Benzene 101 0 500 ug/l 10 0 101 70-130 <br /> Toluene t0 1 0 500 100 101 70-130 <br /> enzene 102 0 500 100 102 70-130 <br /> S{iota{} <br /> 312 0 500 300 104 70-130 <br /> Surrogate a a a-Trefluorotoluene 924 100 91 4 60-140 <br /> Matrix Spike(1040008-MSI) Source S103484-07 Prepared&Analyzed 03/30/01 <br /> Benzene 101 0 500 ug/l 100 ND 101 60-140 <br /> Toluene 101 0 500 10 0 ND 101 60-140 <br /> Ethylbenzene 102 0 500 i0 0 ND 102 60-140 <br /> Xylenes(total) 31 3 0 500 300 ND 104 60-140 _ <br /> Surrogate aaa-Triucrotoluene 859 100 859 60-140 <br /> Matrix Spike Dup(1040008-MSl)1) Source 5103484-07 Prepared&Analyzed 03/30/01 <br /> Benzene 940 0 500 ug/l t 0 0 ND 940 60-140 7 18 25 <br /> Toluene 951 0 500 100 ND 951 60-140 602 25 <br /> Ethylbenzene 953 0 500 100 ND 953 60-140 679 25 <br /> Xylenes(total) 294 0 500 300 ND 980 60-140 626 25 <br /> Surrogate a a a-Trifluorotoluene 732 too 73 2 60-140 <br /> ow Analytical - Sacramento The results in 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 /> Page8of12 <br />